FMC CORP
8-K/A, 1997-10-16
CHEMICALS & ALLIED PRODUCTS
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<PAGE>
 
PAGE 1



                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                           ________________________



                                  FORM 8-K/A

                                CURRENT REPORT



                    Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934

               Date of Report (Date of earliest event reported)
                                October 6, 1997



                               FMC CORPORATION 
            ------------------------------------------------------
            (Exact name of registrant as specified in its charter)



               Delaware                1-2376           94-0479804
   ----------------------------     ------------     ----------------
   (State or other jurisdiction     (Commission      (I.R.S. Employer
        of incorporation)           File Number)    Identification No.)



             200 East Randolph Drive, Chicago, Illinois     60601
            ------------------------------------------------------
             (Address of principal executive offices)   (Zip Code)



                                (312) 861-6000
                        ------------------------------
                        Registrant's telephone number,
                              including area code
<PAGE>
 
PAGE 2

This Form 8-K/A amends Form 8-K (dated October 6, 1997 and filed by Registrant
on October 8, 1997) by providing (1) additional information regarding
Registrant's sale of United Defense, L.P. as required under Item 2, and (2) pro
forma financial information and exhibits related to such sale as required under
Items 7(b) and (c), respectively.

Item 2.  Acquisition or Disposition of Assets

On August 25, 1997, FMC Corporation (the "company" or "FMC"), Harsco
Corporation, Harsco UDLP Corporation (together with Harsco Corporation,
"Harsco"), and Iron Horse Acquisition Corp., an affiliate of The Carlyle Group
("Carlyle"), signed a definitive agreement for the sale of United Defense, L.P.
("United Defense" or "UDLP") and certain other assets to Carlyle for
approximately $850 million. The transaction closed on October 6, 1997.

FMC was the managing general partner and 60 percent owner of United Defense,
which was formed in 1994 by combining FMC's Defense Systems Group with Harsco's
BMY Combat Systems Division. Harsco owned the remaining 40 percent of UDLP.
United Defense supplies ground combat and naval weapons systems for the U.S. and
military customers around the world.

The sale proceeds consist of approximately $800 million cash, to be adjusted
based on certain audited closing balance sheet items as of October 6, 1997, and
a $50 million note payable to FMC by Carlyle upon the finalization of certain
international joint venture agreements. Of the estimated proceeds, FMC will
receive $460 million cash (subject to adjustment) and the note, which FMC
expects to collect in 1998.

In addition to its interest in the UDLP joint venture, FMC also sold to Carlyle
as part of UDLP its wholly-owned Corporate Technology Center ("CTC"). FMC also
agreed to contract for certain research services with CTC in the future. FMC
also transferred approximately 94 of its CTC, corporate legal and defense audit
staff to UDLP in conjunction with the disposition of UDLP. These staff primarily
performed defense-related duties while at FMC.

After deducting its investment in UDLP and providing for transaction costs,
results reported by UDLP during the pre-sale period subsequent to the
measurement date, valuation reserves against certain retained properties, and
other costs, FMC estimates it will recognize a gain of approximately $300
million ($170 million after tax) during the fourth quarter of 1997. As
previously discussed, such estimates are subject to final audits and resolution
of closing issues in accordance with the sales contract. FMC has not determined
the ultimate use of the sale proceeds, but currently expects to use cash
received to retire variable rate debt or commercial paper, contribute towards a
recently-announced common stock repurchase program, and/or invest in short-term
instruments.

Item 7.  Financial Statements and Exhibits

(b)  The following unaudited, pro forma consolidated financial statements are
     filed with this report:

Pro Forma Consolidated Statements of Income:

  For the Year Ended December 31, 1996............................   Page 4
  For the Year Ended December 31, 1995............................   Page 5
  For the Year Ended December 31, 1994............................   Page 6
  For the Six Months Ended June 30, 1997..........................   Page 7
  For the Six Months Ended June 30, 1996..........................   Page 8
 
Pro Forma Condensed Consolidated Balance Sheet at June 30,
 1997.............................................................   Page 9
 
Notes to the Unaudited Pro Forma Consolidated Financial
 Statements.......................................................   Page 10

<PAGE>
 
PAGE 3

The unaudited, pro forma consolidated financial statements are presented for
informational purposes only and do not purport to be indicative of the results
of operations which would actually have been obtained if the transaction had
occurred in the periods indicated below or which may exist or be obtained in the
future. The ultimate use of the proceeds may differ from the assumptions used
herein.

The unaudited, pro forma consolidated statements of income for the years ended
December 31, 1996, 1995 and 1994, and the six months ended June 30, 1997 and
1996, give effect to:

  i.   the elimination of the results of operations of United Defense, L.P., a
       partnership owned 60% by FMC, and certain related operations, which were
       sold as described in Item 2 and in the accompanying notes, and

  ii.  the related pro forma adjustments described in the accompanying notes.

The pro forma results of operations are presented assuming that the disposition
had been completed as of the beginning of the respective periods. These
statements include all material adjustments necessary to restate the historical
results to accommodate these assumptions.

The unaudited, pro forma, condensed, consolidated balance sheet as of June 30,
1997 gives effect to the sale of United Defense, L.P. and certain related
operations and the related pro forma adjustments described in Item 2 and the
accompanying notes. The balance sheet is presented as though the transaction had
occurred on June 30, 1997.

These statements should be read in conjunction with the historical financial
statements and accompanying notes of the Registrant, as previously filed.
<PAGE>
 
PAGE 4

FMC Corporation and Consolidated Subsidiaries
- ---------------------------------------------
Pro Forma Consolidated Statement of Income (Unaudited)
- ------------------------------------------------------
Year Ended December 31, 1996
- ----------------------------
(In millions, except per share data)
- ------------------------------------

<TABLE>
<CAPTION>
                                                         Pro Forma
                                               -----------------------------
                                 Historical       Defense                                       FMC
                                     FMC          Segment      Adjustments      Footnote     Pro Forma
                                -------------  -------------  --------------  ------------  -----------
<S>                             <C>            <C>            <C>             <C>           <C>
Revenue:
    Sales                            $4,969.4       $1,018.8                                   $3,950.6
    Other revenue                       111.2           31.6                                       79.6
                                     --------       --------                                   --------
 
    Total revenue                     5,080.6        1,050.4                                    4,030.2
                                     --------       --------                                   --------
 
Costs and expenses:
    Cost of sales                     3,726.0          796.7                                    2,929.3
    Selling, general and
     administrative
     expenses                           692.7          106.8                                      585.9
    Research and
     development                        189.4           12.9                                      176.5
                                     --------       --------                                   --------
 
    Total costs and
     expenses                         4,608.1          916.4                                    3,691.7
                                     --------       --------                                   --------
 
Income from continuing
 operations before minority
 interests, net interest
 expense and income taxes               472.5          134.0                                      338.5
 
    Minority interests                   56.9           47.2                                        9.7
    Net interest expense                 93.0              -         $(20.6)  2.C.                 72.4
                                     --------       --------         ------                    --------
 
Income from continuing
 operations before income
 taxes                                  322.6           86.8           20.6                       256.4
Provision for income taxes              104.5           31.5            8.3   2.C.                 81.3
                                     --------       --------         ------                    --------
 
Income from continuing
 operations                          $  218.1       $   55.3         $ 12.3                    $  175.1
                                     ========       ========         ======                    ========
 
Earnings per common share
 from continuing operations          $   5.73                                                  $   4.60
                                     ========                                                  ========
 
Average number of shares                 38.1                                                      38.1
                                     ========                                                  ========
</TABLE>

See notes to pro forma consolidated financial statements.
 
<PAGE>

PAGE 5

FMC Corporation and Consolidated Subsidiaries
- ---------------------------------------------
Pro Forma Consolidated Statement of Income (Unaudited)
- ------------------------------------------------------
Year Ended December 31, 1995
- ----------------------------
(In millions, except per share data)
- ------------------------------------

<TABLE>
<CAPTION>
                                                         Pro forma
                                               ------------------------------
                                 Historical        Defense                                       FMC
                                     FMC           Segment        Adjustments   Footnote      Pro Forma
                                -------------      -------        -----------   --------      ---------
<S>                             <C>                <C>            <C>           <C>           <C>
Revenue:
    Sales                            $4,450.8         $968.2                                    $3,482.6
    Other revenue                        56.9           21.4                                        35.5
                                     --------         ------                                    --------

    Total revenue                     4,507.7          989.6                                     3,518.1
                                     --------         ------                                    --------

Costs and expenses:
    Cost of sales                     3,267.3          726.8                                     2,540.5
    Selling, general and
     administrative
     expenses                           631.3           98.1                                       533.2
    Research and
     development                        187.8           12.4                                       175.4
    Restructuring and other
     charges                            134.5              -                                       134.5
                                     --------         ------                                    --------

    Total costs and
     expenses                         4,220.9          837.3                                     3,383.6
                                     --------         ------                                    --------

Income from continuing
 operations before minority
 interests, net interest
 (income) expense, gain on
 sale of FMC Wyoming stock
 and income taxes                       286.8          152.3                                       134.5

    Minority interests                   58.7           53.6                                         5.1
    Net interest (income)
     expense                             74.6           (1.8)         $(22.9)  2.C.                 53.5
    Gain on sale of FMC
     Wyoming stock                       99.7              -               -                        99.7
                                     --------         ------          ------                    --------

Income from continuing
 operations before income
 taxes                                  253.2          100.5            22.9                       175.6
Provision for income taxes               35.7           37.7             9.2  2.C.                   7.2
                                     --------         ------          ------                    --------

Income from continuing
 operations                          $  217.5         $ 62.8          $ 13.7                    $  168.4
                                     ========         ======          ======                    ========

Earnings per common share
 from continuing operations          $   5.77                                                   $   4.47
                                     ========                                                   ========

Average number of shares                 37.7                                                       37.7
                                     ========                                                   ========
</TABLE>



See notes to pro forma consolidated financial statements.
<PAGE>
 
PAGE 6

FMC Corporation and Consolidated Subsidiaries
- ---------------------------------------------
Pro Forma Consolidated Statement of Income (Unaudited)
- ------------------------------------------------------
Year Ended December 31, 1994
- ----------------------------
(In millions, except per share data)
- ------------------------------------

<TABLE>
<CAPTION>
                                                         Pro forma
                                               ------------------------------
                                   Historical        Defense                                       FMC
                                       FMC           Segment       Adjustments     Footnote     Pro Forma
                                   ----------        -------       -----------     --------     ---------
<S>                             <C>            <C>             <C>             <C>          <C>
Revenue:
    Sales                            $3,949.9       $1,080.5                                    $2,869.4
    Other revenue                        39.4           10.5                                        28.9
                                     --------       --------                                    --------

    Total revenue                     3,989.3        1,091.0                                     2,898.3
 
Costs and expenses:
    Cost of sales                     2,874.0          798.6                                     2,075.4
    Selling, general and
     administrative
     expenses                           568.4          108.0                                       460.4
    Research and
     development                        166.8           16.3                                       150.5
                                     --------       --------                                    --------
 
    Total costs and
     expenses                         3,609.2          922.9                                     2,686.3
                                     --------       --------                                    --------
 
Income from continuing
 operations before minority
 interests, net interest
 (income) expense and income
 taxes                                  380.1          168.1                                       212.0
 
    Minority interests                   61.3           59.7                                         1.6
    Net interest (income)
     expense                             57.1           (2.4)         $(22.9)  2.C.                 36.6
                                     --------       --------          ------                    --------
 
Income from continuing
 operations before income
 taxes                                  261.7          110.8            22.9                       173.8
Provision for income taxes               85.5           43.9             9.2   2.C.                 50.8
                                     --------       --------          ------                    --------
 
Income from continuing
 operations                          $  176.2       $   66.9          $ 13.7                    $  123.0
                                     ========       ========          ======                    ========
 
Earnings per common share
 from continuing operations          $   4.73                                                   $   3.31
                                     ========                                                   ========
 
Average number of shares                 37.2                                                       37.2
                                     ========                                                   ========
</TABLE>



See notes to pro forma consolidated financial statements.
<PAGE>
 
PAGE 7

FMC Corporation and Consolidated Subsidiaries
- ---------------------------------------------
Pro Forma Consolidated Statement of Income (Unaudited)
- ------------------------------------------------------
Six Months Ended June 30, 1997
- ------------------------------
(In millions, except per share data)
- ------------------------------------

<TABLE>
<CAPTION>

                                                         Pro forma
                                               ------------------------------
                                   Historical        Defense                                       FMC
                                       FMC           Segment       Adjustments     Footnote     Pro Forma
                                   ----------        -------       -----------     --------     ---------
<S>                                <C>               <C>           <C>             <C>          <C>
Revenue:
    Sales                            $2,735.8         $608.6                                   $2,127.2
    Other revenue                        40.0           11.9                                       28.1
                                     --------         ------                                   --------
 
    Total revenue                     2,775.8          620.5                                    2,155.3
                                     --------         ------                                   --------
 
Costs and expenses:
    Cost of sales                     2,065.1          481.5                                    1,583.6
    Selling, general and
     administrative
     expenses                           363.3           45.9                                      317.4
    Research and
     development                         89.3            6.3                                       83.0
                                     --------         ------                                   --------
 
    Total costs and
     expenses                         2,517.7          533.7                                    1,984.0
                                     --------         ------                                   --------
 
Income from continuing
 operations before minority
 interests, net interest
 expense and income taxes               258.1           86.8                                      171.3
 
    Minority interests                   40.6           35.4                                        5.2
    Net interest expense                 58.8              -         $(10.5)  2.C.                 48.3
                                     --------         ------         ------                    --------
 
Income from continuing
 operations before income
 taxes                                  158.7           51.4           10.5                       117.8
Provision for income taxes               46.0           20.6            4.2   2.C.                 29.6
                                     --------         ------         ------                    --------
 
Income from continuing
 operations                          $  112.7         $ 30.8         $  6.3                    $   88.2
                                     ========         ======         ======                    ========
 
Earnings per common share
 from continuing operations          $   2.95                                                  $   2.31
                                     ========                                                  ========
 
Average number of shares                 38.2                                                      38.2
                                     ========                                                  ========
</TABLE>



See notes to pro forma consolidated financial statements.
<PAGE>
 
PAGE 8

FMC Corporation and Consolidated Subsidiaries
- ---------------------------------------------
Pro Forma Consolidated Condensed Statement of Income (Unaudited)
- ----------------------------------------------------------------
Six Months Ended June 30, 1996
- ------------------------------
(In millions, except per share data)
- ------------------------------------

<TABLE>
<CAPTION>
                                                         Pro forma
                                               -----------------------------
                                   Historical        Defense                                      FMC
                                       FMC           Segment      Adjustments     Footnote     Pro Forma
                                   ----------        -------      -----------     --------     ---------
<S>                             <C>            <C>            <C>             <C>          <C>
Revenue:
    Sales                            $2,345.0         $510.1                                   $1,834.9
    Other revenue                        54.9           30.3                                       24.6
                                     --------         ------                                   --------

    Total revenue                     2,399.9          540.4                                    1,859.5

Costs and expenses:
    Cost of sales                     1,744.8          401.4                                    1,343.4
    Selling, general and
     administrative
     expenses                           325.7           51.0                                      274.7
    Research and
     development                         89.3            6.0                                       83.3
                                     --------         ------                                   --------

    Total costs and
     expenses                         2,159.8          458.4                                    1,701.4
                                     --------         ------

Income from continuing
 operations before minority
 interests, net interest
 expense and income taxes               240.1           82.0                                      158.1

    Minority interests                   35.5           31.4                                        4.1
    Net interest expense                 45.3              -         $(10.3)  2.C.                 35.0
                                     --------         ------         ------                    --------

Income from continuing
 operations before income
 taxes                                  159.3           50.6           10.3                       119.0
Provision for income taxes               45.1           16.6            4.1   2.C.                 32.6
                                     --------         ------         ------                    --------

Income from continuing
 operations                          $  114.2         $ 34.0         $  6.2                    $   86.4
                                     ========         ======         ======                    ========

Earnings per common share
 from continuing operations          $   3.00                                                  $   2.27
                                     ========                                                  ========

Average number of shares                 38.0                                                      38.0
                                     ========                                                  ========
</TABLE>



See notes to pro forma consolidated financial statements.
<PAGE>
 
PAGE 9

FMC Corporation and Consolidated Subsidiaries
- ---------------------------------------------
Pro Forma Condensed Consolidated Balance Sheet (Unaudited)
- ----------------------------------------------------------
June 30, 1997
- -------------
(In millions, except share and per share data)

<TABLE>
<CAPTION>
                                                               Pro forma
                                                         -----------------------
                                           Historical    Defense                                    FMC
                                              FMC        Segment     Adjustments    Footnote    Pro Forma
                                          -----------    -------     -----------    --------    ---------
<S>                                       <C>            <C>         <C>            <C>         <C>
Assets:
Current assets:
  Cash and cash equivalents                 $  105.6      $     -       $ (55.1)      2.G.      $   50.5
  Trade receivables, net of
   allowance of $11.7 (pro forma
   $11.6)                                      985.2        (68.0)                                 917.2
  Inventories                                  893.4       (344.9)                                 548.5
  Other current assets                         159.2         (7.9)         50.0       2.E.         201.3
  Deferred income taxes                         80.5            -           9.6       2.F.          90.1
                                            --------      -------       -------                 --------
 Total current assets                        2,223.9       (420.8)          4.5                  1,807.6
 
Investments                                     52.5         (3.6)                                  48.9
Net assets of discontinued
 operation                                         -         95.6         (95.6)      2.A.             -
Net property, plant and equipment at cost    1,958.1       (115.1)                               1,843.0
Goodwill and intangible assets                 470.1        (28.9)                                 441.2
Other assets and deferred income
 taxes                                         288.3        (39.3)         14.1       2.F.         263.1
                                            --------      -------       -------                 --------
Total assets                                $4,992.9      $(512.1)      $ (77.0)                $4,403.8
                                            ========      =======       =======                 ========
 
Liabilities and Stockholders'
 Equity:
Current liabilities:
  Short-term and current debt               $  387.9      $     -                               $  387.9
  Accounts payable, trade and other            945.7       (344.2)                                 601.5
  Accrued and other current
   liabilities and taxes payable               614.5        (70.9)      $ 177.7       2.F.         721.3
                                            --------      -------       -------                 --------
 Total current liabilities                   1,948.1       (415.1)        177.7                  1,710.7
 
Long-term debt, less current
 portion                                     1,315.1            -        (460.0)      2.C.         855.1
Accrued pension and other
 liabilities                                   490.8        (11.3)                                 479.5
Reserve for discontinued operations            174.8            -          35.3       2.D.         210.1
Minority interests in consolidated
 companies                                     144.2        (85.7)                                  58.5
Stockholders' equity:
  Preferred stock, no par value,
   authorized 5,000,000 shares;
   no shares issued                                -            -                                      -
  Common stock, $0.10 par value,
   authorized 60,000,000 shares;
   issued 37,664,542                             3.8            -                                    3.8
  Capital in excess of par value               129.2            -                                  129.2
  Retained earnings                            919.5            -         170.0      2.B.        1,089.5
  Foreign currency translation adj.           (113.0)           -                                 (113.0)
  Treasury stock, common at cost;
   452,891 shares                              (19.6)           -                                  (19.6)
                                            --------      -------        ------                 --------
   Total stockholders' equity                  919.9            -         170.0                  1,089.9
                                            --------      -------        ------                 --------
Total liabilities and stockholders'
 equity                                     $4,992.9      $(512.1)       $(77.0)                $4,403.8
                                            ========      =======        ======                 ========
</TABLE>

See accompanying notes to pro forma consolidated financial statements.
<PAGE>
 
PAGE 10

FMC Corporation and Consolidated Subsidiaries
- ---------------------------------------------
Notes to Unaudited Pro Forma Consolidated Financial Statements
- --------------------------------------------------------------


Note 1:  Basis of Presentation
- ------------------------------
The accompanying pro forma financial statements are presented in accordance with
Article 11 of Regulation S-X.

The unaudited, pro forma consolidated statements of income for the years ended
December 31, 1996, 1995 and 1994, and the six months ended June 30, 1997 and
1996, were prepared assuming the disposition of the company's 60% interest in
United Defense, L.P. had been completed as of the beginning of the respective
periods. The unaudited, pro forma condensed, consolidated balance sheet as of
June 30, 1997 assumes the transaction had been completed on June 30, 1997. The
unaudited, pro forma consolidated financial statements were prepared based upon
historical financial information from the consolidated FMC and United Defense,
L.P. financial statements as of and for the periods indicated above. The
unaudited, pro forma, consolidated financial statements should be read in
conjunction with the historical, consolidated financial statements of FMC
Corporation, as previously filed.


Note 2:  Pro Forma Adjustments
- ------------------------------
The following pro forma adjustments have been made to the pro forma consolidated
financial statements:

A. Elimination of the results of operations of the company's Defense Systems
   segment (which includes United Defense, L.P., a partnership owned 60% by FMC,
   as described in Item 2), and of the assets, liabilities and net worth
   attributable to the segment. (See "Defense Segment" column on pro forma
   consolidated financial statements.)

B. Assumed after-tax gain on the transaction estimated at $170 million at June
   30, 1997, noting that such gain amount is estimated based on final proceeds
   to be determined in accordance with the sale agreement and subject to audit,
   which amount has not yet been finalized. The pro forma condensed,
   consolidated balance sheet reflects the estimated after-tax gain on the sale
   only to the extent it affects the company's equity at June 30, 1997.

C. Assumed after-tax proceeds from the transaction of $375 million for each
   period presented, noting that such proceeds are estimated based on final
   proceeds determined in accordance with the sale agreement and subject to 
   post-closing audit, which amount has not yet been finalized. Use of the net
   cash proceeds from the sale to reduce FMC's long-term debt outstanding under
   its revolving term credit facility, commercial paper obligations and other
   debt issues, and the related income tax effect; reduction in related interest
   expense is based on the weighted average rates of interest associated with
   specific debt assumed to be paid of 5.6%, 5.5%, 6.1% and 6.1% in 1997, 1996,
   1995 and 1994, respectively.

D. Recognition of liabilities associated with the discontinued Defense Systems
   segment.

E. Recognition of a $50 million short-term note receivable from the buyer.

F. Recognition of accrued liabilities related to closing and other costs, and of
   income tax payable and deferred income taxes on the transaction.

G. Payment of intercompany loan of $55.1 million.

<PAGE>
 
PAGE 11

(c)  See Exhibit Index
 
<PAGE>
 
PAGE 12

                                  SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                              FMC CORPORATION



                              By  /s/ Michael J. Callahan
                                -------------------------------
                                 Michael J. Callahan
                                 Executive Vice President and
                                 Chief Financial Officer



Date:  October 16, 1997
<PAGE>
 
PAGE 13

Exhibit Index

<TABLE>
<CAPTION>
Number in
Exhibit Table      Description
- -------------      -----------
 
<S>                <C>
2.1                Purchase Agreement, dated as of August 25, 1997, by and among
                   FMC Corporation, Harsco Corporation, Harsco UDLP Corporation
                   and Iron Horse Acquisition Corp.
 
10.1               Supplemental Agreement No. 1 to Purchase Agreement, dated as of
                   August 25, 1997, by and among FMC Corporation, Harsco
                   Corporation, Harsco UDLP Corporation and Iron Horse Acquisition
                   Corp. (confidential portions omitted pursuant to a Confidential
                   Treatment Request separately filed with the Commission).
 
10.2               Allocation and Contribution Agreement, dated as of August 25,
                   1997, by and among FMC Corporation, Harsco Corporation and
                   Harsco UDLP Corporation (confidential portions omitted pursuant
                   to a Confidential Treatment Request separately filed with the
                   Commission).
</TABLE>

<PAGE>
 
                                                                     EXHIBIT 2.1

================================================================================


                              PURCHASE AGREEMENT


                                     among


                               FMC CORPORATION,

                              HARSCO CORPORATION,

                            HARSCO UDLP CORPORATION

                                      and

                         IRON HORSE ACQUISITION CORP.


                        -------------------------------

                          Dated as of August 25, 1997

                        -------------------------------

================================================================================
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE>
<CAPTION> 
                                                                               Page
                                                                               ----
<S>  <C>                                                                    <C>
1a   Certain Definitions; Purchase and Sale of Interests......................   1
     (a) Certain Definitions..................................................   1
     (b) Purchase and Sale of Interests; Final Purchase Price.................   3
     (c) Estimated Final Purchase Price.......................................   3
2a   Closing..................................................................   4
     (a) Closing..............................................................   4
     (b) Net Worth Adjustment.................................................   5
     (c) Limited Partnership Form of UDLP.....................................   7
     (d) Transfer to FMC Affiliate............................................   8
3a   Conditions to Closing....................................................   8
     (a) Buyer's Obligation...................................................   8
     (b) Each Seller's Obligation.............................................   9
4a   Representations and Warranties of Sellers................................  10
4A.  Representations and Warranties of FMC....................................  10
     (a) Authority: No Conflicts..............................................  10
     (b) Ownership of the Interests...........................................  10
4B.  Representations and Warranties of Harsco.................................  11
     (a) Authority; No Conflicts..............................................  11
     (b) Ownership of the Interests...........................................  11
4C.  Representations and Warranties of Sellers................................  11
     (a) Authority; No Conflicts..............................................  11
     (b) Ownership of the Interests...........................................  12
     (c) Subsidiaries and Foreign Affiliates..................................  12
     (d) Financial Statements.................................................  13
     (e) Title to Tangible Assets Other than Real Property Interests..........  13
     (f) Title to Real Property...............................................  14
     (g) Intellectual Property................................................  15
     (h) Material Contracts...................................................  15
     (i) Litigation; Decrees..................................................  17
     (j) Compliance with Applicable Laws......................................  17
     (k) Employee Benefit Plans...............................................  17
     (l) Taxes................................................................  20
     (m) Insurance............................................................  22
     (n) Environmental Compliance.............................................  23
     (o) Undisclosed Liabilities..............................................  23
     (p) Absence of Certain Changes or Events.................................  24
     (q) Government Contracts.................................................  24
     (r) Labor Relations......................................................  25
     (s) Licenses, Permits and Authorizations.................................  25
     (t) Assets...............................................................  25
</TABLE> 

                                      -i-
<PAGE>
 
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
     (u)  Loss Contracts; Backlog.........................................   26
     (v)  Customers, Distributors and Suppliers...........................   26
     (w)  Dividends by Foreign Affiliates.................................   27
5.   Covenants of Sellers.................................................   27
     (a)  Access..........................................................   27
     (b)  Ordinary Conduct................................................   27
     (c)  Confidentiality.................................................   29
     (d)  Preservation of Business........................................   30
     (e)  Covenant Not to Compete.........................................   30
     (f)  Cooperation.....................................................   30
     (g)  FMC Resource Transfer...........................................   31
     (h)  Intercompany Obligations........................................   31
     (i)  Financing Obligations...........................................   31
     (j)  Notification of Certain Matters.................................   31
     (k)  FMC Arabia......................................................   31
6.   Representations and Warranties of Buyer..............................   32
     (a)  Authority; No Conflicts.........................................   32
     (b)  Actions and Proceedings, etc....................................   32
     (c)  Availability of Funds...........................................   33
     (d)  Acquisition of Interests for Investment.........................   33
     (e)  Fulfillment of Condition........................................   33
7.   Covenants of Buyer...................................................   33
     (a)  Confidentiality.................................................   33
     (b)  Performance of Obligations by Buyer After Closing Date..........   34
     (c)  No Additional Representations; Disclaimer Regarding Estimates
            and Projections...............................................   34
     (d)  Intentionally omitted...........................................   35
     (e)  Certain Guaranties..............................................   35
     (f)  Retained Assets and Liabilities.................................   35
     (g)  1997 Audited Financial Statements...............................   36
8.   Mutual Covenants.....................................................   37
     (a)  Consents........................................................   37
     (b)  Publicity.......................................................   37
     (c)  Best Efforts....................................................   38
     (d)  HSR Act Compliance..............................................   38
     (e)  Cooperation with Financings.....................................   38
     (f)  Environmental Indemnification...................................   39
     (g)  Written Materials and Records...................................   43
     (h)  Transferred Employees and Employee Benefits.....................   44
     (i)  Mutual Release..................................................   50
     (j)  Insurance.......................................................   51
     (k)  Transition Services Agreement...................................   51
     (l)  Technology and Environmental Services Agreement.................   51
     (m)  Lease...........................................................   51
     (n)  Intellectual Property Agreements................................   52
</TABLE>

                                      -ii-
<PAGE>
 
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
     (o)  Intellectual Property Recordations..............................   52
     (p)  Cash Balance as of the Closing..................................   52
     (q)  FNSS Royalty Dispute............................................   52
 9.  Further Assurances...................................................   52
10.  Tax Matters..........................................................   52
11.  Indemnification......................................................   58
     (a)  Indemnification by Sellers......................................   58
     (b)  Exclusive Remedy................................................   58
     (c)  Indemnification by Buyer........................................   59
     (d)  Losses Net of Insurance and Tax Benefits........................   59
     (e)  Termination of Indemnification..................................   60
     (f)  Procedures Relating to Indemnification..........................   60
12.  Assignment...........................................................   61
13.  No Third-Party Beneficiaries.........................................   62
14.  Termination..........................................................   62
15.  Survival of Representations..........................................   63
16.  Expenses.............................................................   63
17.  Amendment and Waiver.................................................   63
18.  Notices..............................................................   64
19.  Interpretation.......................................................   65
20.  No Strict Construction...............................................   65
21.  Counterparts.........................................................   65
22.  Entire Agreement.....................................................   65
23.  Brokerage............................................................   65
24.  Schedules............................................................   66
25.  Representation by Counsel; Interpretation............................   66
26.  Severability.........................................................   66
27.  Governing Law........................................................   66
28.  Exhibits and Schedules...............................................   67
29.  Dispute Resolution...................................................   67
     (a)  Negotiation.....................................................   67
     (b)  Arbitration.....................................................   67
LIST OF EXHIBITS..........................................................   69
LIST OF SCHEDULES.........................................................   70

</TABLE>

                                     -iii-
<PAGE>
 
                             INDEX OF DEFINED TERMS
                             ----------------------
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Accounting Firm............................................................   6
Activity...................................................................  36
Adjusted Net Worth Amount..................................................   7
Adjustment Amount..........................................................   4
Adjustment Principles......................................................   5
Affiliate..................................................................   1
Agreement..................................................................   1
Ancillary Agreements.......................................................   1
Applicable Accounting Principles...........................................   1
Backlog....................................................................  26
BPI Award..................................................................  49
Business...................................................................   1
Buyer......................................................................   1
Buyer Indemnified Parties..................................................  58
Buyer Released Parties.....................................................  50
CAS........................................................................  46
Cause......................................................................  48
Closing....................................................................   4
Closing Balance Sheet......................................................   5
Closing Date...............................................................   4
Closing Statement..........................................................   5
COBRA......................................................................  19
Code.......................................................................  56
Continuing Guaranty........................................................  35
Continuing LC Obligations..................................................  31
Defense Segment Plan.......................................................  46
Diligence Confidentiality Agreement........................................  33
E&Y........................................................................   5
Environmental Claims.......................................................  42
Environmental Losses.......................................................  40
Environmental Requirements.................................................  23
ERISA......................................................................  18
Estimated Final Purchase Price.............................................   4
Facility...................................................................  41
File Plan..................................................................  44
Final Purchase Price.......................................................   3
Financial Statements.......................................................  13
Financing Obligations......................................................   2
FMC........................................................................   1
FMC Arabia.................................................................  31

</TABLE>

                                     -iv-
<PAGE>
 
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
FMC Arabia Interests......................................................  31
FMC Employee Benefit Plans................................................  18
FMC Insurers..............................................................  40
FMC Intellectual Property Agreement.......................................  52
FMC Master Trusts.........................................................  48
FMC Salaried Plan.........................................................  46
FMC Thrift Plan...........................................................  47
Foreign Affiliate Closing Balance Sheet...................................  56
Foreign Affiliate Tax Basket..............................................  53
Foreign Affiliates........................................................  13
FRS.......................................................................   5
Government Contract.......................................................  25
Harsco....................................................................   1
Harsco Intellectual Property Agreement....................................  52
Harsco Party..............................................................  11
Hazardous Material........................................................  41
HSR Act...................................................................   8
HUC.......................................................................   1
Inactive Contracts........................................................   2
Income Tax Returns........................................................  57
Income Taxes..............................................................  57
indemnified party.........................................................  60
Information...............................................................  29
Initial Purchase Price....................................................   3
Intellectual Property.....................................................   2
Interests.................................................................   1
IRS.......................................................................  57
June 30 Balance Sheet.....................................................  13
knowledge.................................................................   2
Latest Financials.........................................................  13
Lease.....................................................................  51
Leased Property...........................................................  14
Leased Sites..............................................................  40
Liens.....................................................................  14
Losses....................................................................  58
Material Adverse Effect...................................................   2
Material Contracts........................................................  17
MIP.......................................................................  49
Non-Allowable Costs.......................................................  40
Notice of Disagreement....................................................   6
Other Taxes...............................................................  57
Owned Properties..........................................................  14
Owned Property............................................................  14

</TABLE>

                                      -v-
<PAGE>
 
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Pension Plan...............................................................  19
Permitted Liens............................................................  14
Personnel..................................................................  24
Post-Closing Environmental Losses..........................................  41
Post-Closing Partial Period................................................  53
Pre-Closing Partial Period.................................................  53
Principal Management.......................................................  43
Pro Rata Basis.............................................................   3
Properties.................................................................  14
Property...................................................................  14
Public Filings.............................................................  38
Purchase...................................................................   1
Records....................................................................  44
Remediation Costs..........................................................  40
Remediation Report.........................................................  39
Representatives............................................................  67
Required Consent...........................................................  37
Retained Employees.........................................................  45
Retained Liabilities.......................................................   3
San Jose Plan..............................................................  47
Schedules..................................................................   3
Scope of Activity..........................................................  30
Seller Guaranty............................................................  35
Seller Indemnified Parties.................................................  59
Seller Information.........................................................  34
Seller Released Parties....................................................  50
Sellers....................................................................   1
Settlement and Advance Agreement...........................................  39
Sites......................................................................  40
Subsidiaries...............................................................   3
Substitute Letters of Credit...............................................  35
Target Adjusted Net Worth Amount...........................................   3
Tax........................................................................  57
Tax Laws...................................................................  57
Tax Returns................................................................  57
Taxes......................................................................  57
Taxing Authority...........................................................  57
Technology and Environmental Services Agreement............................  51
Third Party Claim..........................................................  60
Timely Non-Allowable Costs.................................................  40
Transfer Notice............................................................  31
Transferred Employees......................................................  45
Transition Services Agreement..............................................  51

</TABLE>

                                      -vi-
<PAGE>
 
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
UDLP.......................................................................   1
UDLP Employee Benefit Plans................................................  18
UDLP Employees.............................................................  47
UDLP Thrift Plan...........................................................  47
UDLP's Share...............................................................  57

</TABLE>

                                     -vii-
<PAGE>
 
                               PURCHASE AGREEMENT
                               ------------------

          This PURCHASE AGREEMENT (this "Agreement"), dated as of August 25,
1997, is entered into by and among FMC Corporation, a Delaware corporation
("FMC"), Harsco Corporation, a Delaware corporation, Harsco UDLP Corporation, a
Pennsylvania business corporation ("HUC" and, together with Harsco Corporation,
"Harsco"), and Iron Horse Acquisition Corp., a Delaware corporation ("Buyer").
FMC and Harsco are collectively referred to herein as "Sellers."

                              W I T N E S S E T H:
                              ------------------- 

          WHEREAS, FMC is the sole owner and holder of 100% of the outstanding
general partnership interests of United Defense, L.P., a Delaware limited
partnership ("UDLP"), and HUC is the sole owner and holder of 100% of the
outstanding limited partnership interests of UDLP; and

          WHEREAS, Buyer desires to purchase from Sellers, and Sellers desire to
sell to Buyer, 100% of the outstanding general partnership and limited
partnership interests of UDLP (the "Interests") (the sale and purchase of the
Interests being referred to herein as the "Purchase").

          NOW, THEREFORE, the parties hereto hereby agree as follows:

          1.   Certain Definitions; Purchase and Sale of Interests.

          (a)   Certain Definitions.  As used in this Agreement (including the
     Schedules and Exhibits hereto), the following definitions shall apply:

          (i)   "Affiliate" shall mean any natural person, and any corporation,
     partnership or other entity, that directly, or indirectly through one or
     more intermediaries, controls or is controlled by or is under common
     control with the party specified.

          (ii)  "Ancillary Agreements" shall mean the Transition Services
     Agreement, the Technology and Environmental Services Agreement, the Lease,
     the FMC Intellectual Property Agreement and the Harsco Intellectual
     Property Agreement.

          (iii) "Applicable Accounting Principles" shall mean United States
     generally accepted accounting principles as consistently applied in the
     preparation of the Financial Statements, subject to any exceptions
     therefrom disclosed in the notes to the Financial Statements.

          (iv)  "Business" shall mean the entire business and operations of UDLP
     and its Subsidiaries and Foreign Affiliates as conducted on the date
     hereof, including the business to be transferred to UDLP pursuant to
     Section 5(g).
<PAGE>
 
          (v)    "Financing Obligations" shall mean (i) indebtedness of UDLP or
     its Subsidiaries for borrowed money, (ii) obligations of UDLP or any of its
     Subsidiaries evidenced by bonds, notes, debentures, letters of credit or
     similar instruments, (iii) obligations of UDLP or any of its Subsidiaries
     under conditional sale, title retention or similar agreements or
     arrangements creating an obligation of UDLP or any of its Subsidiaries with
     respect to the deferred purchase price of property (other than customary
     trade credit), (iv) breakage and other costs relating to interest rate and
     currency obligation swaps, hedges or similar arrangements to which UDLP or
     any of its Subsidiaries is a party and (v) all obligations of UDLP or any
     of its Subsidiaries to guarantee any of the foregoing types of obligations
     on behalf of others.

          (vi)   "Inactive Contracts" shall mean all contracts or other legally
     binding arrangements, whether oral or written, which have been entered into
     or assumed by UDLP which provide for the delivery of products or the
     rendering of contract-defined deliverable services by a Seller or UDLP and
     with respect to which the final product has been delivered and the final
     service has been rendered.

          (vii)  "Intellectual Property" shall mean all (i) domestic and foreign
     registrations of trademarks, service marks, logos, corporate names,
     protected models, designs, created works, trade names or other trade
     rights, (ii) pending applications for any such registrations, (iii) patents
     and registered copyrights and pending applications therefor, (iv) rights to
     other trademarks, service marks, copyrights, logos, corporate names,
     protected models, designs, created works, trade names and other trade
     rights and all other trade secrets, designs, plans, specifications,
     technology, know-how, methods, designs, concepts and other proprietary
     rights, whether or not registered and (v) rights under any licenses to use
     any copyrights, marks, trade names, trade rights, patents, registered
     models and designs, created works or other proprietary rights.

          (viii) The term "knowledge," when used in the phrase "to the knowledge
     of Sellers," shall mean, and shall be limited to, the actual knowledge
     after reasonable inquiry of the following individuals: Larry D. Brady,
     Robert N. Burt, Michael J. Callahan, Randall S. Ellis, Ronald D. Mambu, J.
     Paul McGrath, Thomas W. Rabaut, Francis Raborn, David A. Kolovat, Peter C.
     Woglom (as to the operations of the Ground Systems Division of the
     Business), Frederick M. Strader (as to the operations of the Armament
     Systems Division of the Business), David Keller, Andy Eross and each
     current member of the Advisory Committee (as defined in that certain
     Partnership Agreement by and among Sellers and UDLP dated January 1, 1994).
 
          (ix)   "Material Adverse Effect" shall mean a material adverse effect
     upon the Business or the assets, liabilities or financial condition of
     UDLP, its Subsidiaries and Foreign Affiliates taken as a whole.

          (x)    "Pro Rata Basis" shall mean 60% with respect to FMC and 40%
     with respect to Harsco.

                                      -2-
<PAGE>
 
          (xi)   "Retained Liabilities" shall mean any and all liabilities of
     Sellers, UDLP or any of its Subsidiaries arising out of, relating to, or in
     respect of the matters described on Schedule 7(f) hereto.

          (xii)  "Schedules" shall mean the disclosure schedules attached hereto
     and incorporated by reference herein.

          (xiii) "Subsidiaries" shall mean, with respect to any person, any
     corporation or other entity of which 50% or more of the voting power of the
     equity securities or equity interests is owned, directly or indirectly, by
     such person, and shall include (without limitation) in the case of UDLP,
     UDLP International, Inc., a Delaware corporation, UD United Defense
     International Sales Corporation, a Barbados corporation and UDLP
     Components, Limited, a Bermuda corporation, but shall specifically exclude
     the Foreign Affiliates. Notwithstanding anything herein or on Schedule
     4C(c)-1, G&F Company, a California general partnership, shall not be deemed
     a "Subsidiary" for purposes of this Agreement.

All other capitalized terms used herein (or in the Schedules or Exhibits hereto)
and not defined above are defined elsewhere in this Agreement.  See "Index of
Defined Terms" above for references to the page numbers on which such terms are
defined.

          (b)    Purchase and Sale of Interests; Final Purchase Price. On the
terms and subject to the conditions of this Agreement, at the Closing Sellers
shall sell, transfer and deliver to Buyer, and Buyer shall purchase from
Sellers, the Interests, free and clear of all Liens, and the covenants contained
in Section 5(e) for an aggregate cash purchase price of $510,000,000.00 in
respect of the general partnership interests held by FMC and the covenants made
by FMC in Section 5(e) and $340,000,000.00 in respect of the limited partnership
interests held by HUC and the covenants made by HUC in Section 5(e)
(collectively, the "Initial Purchase Price"). The final purchase price for the
Interests and the covenants contained in Section 5(e) (the "Final Purchase
Price") shall be equal to:

               (i)   the Initial Purchase Price; plus

               (ii)  the amount, if any, by which the Adjusted Net Worth Amount
          reflected on the Closing Statement in its final and binding form
          exceeds $160,889,000 (the "Target Adjusted Net Worth Amount"); minus

               (iii) the amount, if any, by which the Target Adjusted Net Worth
          Amount exceeds the Adjusted Net Worth Amount reflected on the Closing
          Statement in its final and binding form.

          (c)    Estimated Final Purchase Price. At the Closing, pursuant to the
provisions of Section 2(a)(i) below, Buyer shall pay Sellers an amount (the
"Estimated Final Purchase Price") equal to the Final Purchase Price as estimated
in good faith by FMC based on information provided

                                      -3-
<PAGE>
 
by UDLP management and set forth in a statement delivered to Buyer not less than
two business days prior to the Closing Date. Such notice shall set forth FMC's
and UDLP's good faith estimate of the Adjusted Net Worth Amount. For purposes of
this Agreement, the difference, positive or negative, between the Estimated
Final Purchase Price and the Initial Purchase Price is referred to herein as the
"Adjustment Amount."

          2.   Closing.

          (a)  Closing. The closing (the "Closing") of the transactions
contemplated hereby shall be held at the offices of Kirkland & Ellis, 200 East
Randolph Drive, Chicago, Illinois at 10:00 a.m., local time, on October 31, 1997
or, if the conditions to Closing set forth in Sections 3(a)(iii) and 3(b)(iii)
shall not have been satisfied or waived by such date, on the third business day
following satisfaction of such conditions. Notwithstanding the scheduled Closing
Date of October 31, 1997, as set forth above, the parties agree to use their
commercially reasonable efforts to cause the Closing to occur earlier on
September 30, 1997, or other mutually agreeable date as soon after September 30,
1997 as practicable. The date on which the Closing shall occur is hereinafter
referred to as the "Closing Date," and the Closing shall be deemed effective as
of 12:01 a.m. on the Closing Date. On the business day immediately preceding the
Closing Date, Buyer and Sellers shall conduct a pre-Closing at the same location
as the Closing, commencing at 10:00 a.m., local time, at which each party shall
present for review by the other party copies in execution form of all documents
required to be delivered by such party at the Closing.

          (i)  At the Closing, subject to and on the terms and conditions set
     forth in this Agreement, Buyer shall deliver to Sellers (A) the Estimated
     Final Purchase Price as follows: (1) by wire transfer to a bank account
     designated in writing by FMC, immediately available funds in an amount
     equal to $510,000,000.00 plus 60% of the Adjustment Amount (whether
     positive or negative), and (2) by wire transfer to a bank account
     designated in writing by Harsco, immediately available funds in an amount
     equal to $340,000,000.00 plus 40% of the Adjustment Amount (whether
     positive or negative), (B) an instrument of assumption reasonably
     satisfactory to each Seller and Buyer assuming, subject to the other terms
     and conditions of this Agreement, all of the obligations and liabilities of
     whatever kind of such Seller in its capacity as a partner or predecessor of
     UDLP to be assumed pursuant to the terms of this Agreement, (C) such other
     documents as are specifically required by this Agreement, (D) certified
     copies of resolutions duly adopted by Buyer's board of directors
     authorizing the execution, delivery and performance of this Agreement and
     the Ancillary Agreements to which Buyer is a party, (E) a certificate of
     the Secretary or an Assistant Secretary of Buyer as to the incumbency of
     the officer(s) of Buyer (who shall not be such Secretary or Assistant
     Secretary) executing this Agreement or any Ancillary Agreement, (F) a legal
     opinion of Buyer's special counsel, addressed to each Seller and dated the
     Closing Date, substantially in the form attached hereto as Exhibit 2(a)(i)
     and (G) appropriate releases by UDLP of each Seller as a partner or
     predecessor of UDLP, in form and substance reasonably satisfactory to such
     Seller and Buyer, and consistent with the provisions of Section 8(i) below.

                                      -4-
<PAGE>
 
          (ii) At the Closing, subject to and on the terms and conditions set
     forth in this Agreement, Sellers shall deliver or cause to be delivered to
     Buyer (A) such appropriately executed instruments of sale, assignment,
     transfer and conveyance in form and substance reasonably satisfactory to
     Buyer and Seller and its counsel evidencing and effecting the sale and
     transfer to Buyer of the Interests (it being understood that such
     instruments shall not require Sellers or their Affiliates to make any
     additional representations, warranties or covenants, expressed or implied,
     not contained in this Agreement), (B) such other documents as are
     specifically required by this Agreement, (C) certified copies of
     resolutions duly adopted by the board of directors of each Seller
     authorizing the execution, delivery and performance of this Agreement and
     the Ancillary Agreements, to the extent each is a party hereto or thereto,
     (D) a certificate of the Secretary or an Assistant Secretary of each
     Seller, and of UDLP, as to the incumbency of the officer(s) of each (who
     shall not be such Secretary or Assistant Secretary) executing this
     Agreement or any Ancillary Agreement and (E) legal opinions of each
     Seller's special counsel, addressed to Buyer and dated the Closing Date,
     substantially in the form attached hereto as Exhibit 2(a)(ii).

          (b)  Net Worth Adjustment.

          (i)  Within 60 days after the Closing Date, UDLP shall, with the
     assistance of FMC consistent with past practice, prepare and deliver to
     Buyer a balance sheet of UDLP as of the Closing Date (the "Closing Balance
     Sheet"). The Closing Balance Sheet shall be prepared in a manner consistent
     with the June 30 Balance Sheet and in accordance with the Applicable
     Accounting Principles (without regard to any purchase accounting
     adjustments arising out of the consummation of the transactions
     contemplated hereby). The Closing Balance Sheet shall be audited by Ernst &
     Young L.L.P. ("E&Y"). E&Y shall also provide audited financial statements
     through the Closing Date to Sellers so that each may comply with its
     respective reporting obligations. In connection with the foregoing, UDLP
     shall provide the Closing Date financial reporting system ("FRS") package
     to FMC five days prior to the commencement of the E&Y audit, and UDLP shall
     provide Buyer and Sellers a complete list of all adjustments to accruals in
     excess of $250,000 made subsequent to June 30, 1997. E&Y may begin field
     work for procedural tests prior to delivery of the Closing Date FRS
     package.

          Within 60 days after the Closing Date, UDLP shall, with the assistance
     of FMC, prepare and deliver to Buyer a statement of the Adjusted Net Worth
     Amount as of the Closing Date (the "Closing Statement"). The Closing
     Statement shall be prepared based solely upon the Closing Balance Sheet,
     adjusted in accordance with the principles set forth on Schedule 2(b)
     hereto (the "Adjustment Principles") which, in the event of a conflict with
     the Applicable Accounting Principles, shall control. The parties agree that
     the determination contemplated by this Section 2(b) is solely intended to
     show changes between the Adjusted Net Worth Amount on the Closing Date and
     the Target Adjusted Net Worth Amount as calculated in accordance with
     Schedule 2(b). Subject to the Adjustment Principles, the Target Adjusted
     Net Worth Amount is based upon methodologies, practices and principles used
     in connection with the preparation of the June 30 Balance Sheet and the
     adjustment

                                      -5-
<PAGE>
 
     contemplated by this Section 2(b) can only be properly measured if the
     Closing Statement is prepared using such methodologies, practices and
     principles. During the preparation of the Closing Statement and the period
     of any dispute with respect thereto, Buyer shall and shall cause UDLP to
     (A) provide FMC and FMC's representatives with full access during normal
     business hours to the books, records (including work papers, schedules,
     memoranda and other documents), facilities and employees of UDLP, (B)
     provide FMC as promptly as practicable following the Closing Date (but in
     no event later than 30 days after the Closing Date) with normal year-end
     closing financial information for UDLP for the period ending as of the
     opening of business on the Closing Date and (C) cooperate fully with FMC
     and FMC's representatives, including the provision on a timely basis of
     full access to employees and all other information necessary or useful in
     connection with the preparation of the Closing Statement. The Closing
     Statement shall be reviewed by E&Y and accompanied by an appropriate report
     confirming that the Closing Statement has been prepared in accordance with
     this Section 2(b). During the 30 days immediately following receipt by
     Buyer and FMC of the Closing Statement, Buyer and FMC shall be permitted to
     review E&Y's working papers relating to the audit of the Closing Balance
     Sheet and review of the Closing Statement and Buyer shall be permitted to
     review the financial and accounting papers provided by FMC for use in
     preparing the Closing Statement.

          The Closing Statement shall become final and binding upon the parties
     hereto on the thirtieth day following receipt thereof by Buyer and FMC
     unless Buyer or FMC gives written notice of its disagreement (a "Notice of
     Disagreement") to UDLP and the other parties hereto prior to such date. Any
     Notice of Disagreement shall (A) specify in reasonable detail the nature
     and amount of any disagreement so asserted and (B) only include
     disagreements based on mathematical errors or based on the Closing
     Statement not being prepared in accordance with this Section 2(b). If a
     timely Notice of Disagreement is delivered, then the Closing Statement (as
     revised in accordance with clause (x) or (y) below) shall become final and
     binding upon the parties on the earlier of (x) the date the parties hereto
     resolve in writing any differences they have with respect to any matter
     specified in the Notice of Disagreement or (y) the date any matters
     properly in dispute are finally resolved in writing by the Accounting Firm.
     During the 30 days immediately following the delivery of a Notice of
     Disagreement, FMC and Buyer shall seek in good faith to resolve in writing
     any differences which they may have with respect to any matter specified in
     the Notice of Disagreement. During such period, Buyer or FMC, as
     applicable, shall have full access to the working papers of the other
     prepared in connection with Buyer's review of the Closing Statement and
     preparation of such other party's Notice of Disagreement. At the end of
     such 30-day period, FMC and Buyer shall submit to a "Big-Six" accounting
     firm (the "Accounting Firm") for review and resolution of any and all
     matters which remain in dispute and which were properly included in the
     Notice of Disagreement, and the Accounting Firm shall make a final
     determination of the Closing Statement which shall be binding on the
     parties (it being understood, however, that the Accounting Firm shall act
     as an arbitrator to determine, based solely on presentations by Buyer and
     FMC (and not by independent review), only those matters which remain in
     dispute and which were properly included in the Notice of Disagreement).
     The Closing Statement shall become final and binding on Buyer and Sellers
     on the date the Accounting

                                      -6-
<PAGE>
 
     Firm delivers its final resolution to the parties (which final resolution
     shall be delivered as soon as practicable following the selection of the
     Accounting Firm and in any event within 30 days thereafter). The Accounting
     Firm shall be selected by FMC and Buyer or, if such parties are unable to
     agree, by FMC's and Buyer's independent accountants. The fees and expenses
     of E&Y and the Accounting Firm pursuant to this Section 2(b) shall be borne
     50% by Buyer and 50% by Sellers on a Pro Rata Basis.

          (ii)   If the Estimated Final Purchase Price is less than the Final
     Purchase Price, Buyer shall, and if the Estimated Final Price is greater
     than the Final Purchase Price, Sellers shall, within five business days
     after the Closing Statement becomes final and binding on the parties, make
     payment to the other party or parties by wire transfer in immediately
     available funds of the amount of such difference, together with interest
     thereon at the average one-month London Interbank Offered Rate as quoted by
     the Bloomberg Financial Markets Commodities and News Service calculated on
     the basis of the number of days elapsed from the Closing Date to the date
     of payment. Any payments to or by Sellers pursuant to this clause (ii)
     shall be made on a Pro Rata Basis to or by, as the case may be, FMC and
     Harsco.

          (iii)  For purposes of this Agreement, the term "Adjusted Net Worth
     Amount" means the total assets of UDLP and its consolidated Subsidiaries as
     of the Closing Date, less the total liabilities of UDLP and its
     consolidated Subsidiaries as of the Closing Date, as reflected on the
     Closing Balance Sheet, after giving effect to the Adjustment Principles
     described on Schedule 2(b).
        
          (iv)   Each party agrees that it will not take any actions with
     respect to the accounting books, records, policies and procedures of UDLP
     that would obstruct or hinder the preparation of the Closing Statement as
     provided in this Section 2(b). Buyer will cooperate in the preparation of
     the Closing Statement, including providing customary certifications to
     Sellers or, if requested, to Sellers' auditors, Ernst & Young L.L.P. or the
     Accounting Firm. Harsco acknowledges and agrees that FMC has sole authority
     to act on behalf of Sellers with respect to all matters relating to this
     Section 2(b).

          (c)    Limited Partnership Form of UDLP. Buyer hereby agrees that it
will take all necessary action, including assigning portions of its rights to
purchase the Interests to one or more of its Affiliates, in order to maintain
UDLP as a validly existing Delaware limited partnership for a period of at least
thirty (30) days following the Closing Date, and for at least such 30-day period
Buyer shall take no actions which would have the effect of dissolving, winding
up or liquidating UDLP under the Code or the Delaware Revised Uniform Limited
Partnership Act, each as in effect at such time. Notwithstanding any provision
of this Agreement to the contrary, no representation, warranty or covenant shall
be deemed to be breached and no condition to Closing shall be deemed to be
unsatisfied as a result of any actual or prospective impediment to any
dissolution, liquidation or winding up of UDLP, it being understood that Sellers
have made and are making no representations or warranties concerning Buyer's
ability to liquidate or otherwise restructure UDLP.


                                      -7-
<PAGE>
 
          (d)  Transfer to FMC Affiliate. Notwithstanding anything to the
contrary in this Agreement, the parties hereto agree that, prior to the Closing,
FMC may transfer all of the Interests owned by it to an Affiliate of FMC that is
(i) incorporated in a domestic jurisdiction and (ii) 100% directly or indirectly
owned by FMC, provided that such transfer does not adversely affect UDLP or
Buyer and provided that such Affiliate agrees to be bound by the terms hereof.
Upon such a transfer, the defined term "FMC" as used herein or in the Ancillary
Agreements shall be deemed to include such Affiliate. In no event shall FMC be
relieved of any obligation for which it would otherwise be liable hereunder in
the absence of such a transfer.

          3.   Conditions to Closing.

          (a)  Buyer's Obligation. The obligation of Buyer to purchase and pay
for the Interests is subject to the satisfaction (or waiver by Buyer) as of the
Closing of the following conditions:

          (i)    The representations and warranties of Sellers made in this
     Agreement shall be true and correct in all material respects as of the date
     hereof and on and as of the Closing Date, as though made on and as of the
     Closing Date, except to the extent of changes or developments contemplated
     by the terms of this Agreement and except for representations and
     warranties that speak as of a specific date or time (which need only be
     true and correct as of such date or time), and each Seller shall have
     performed or complied with all obligations and covenants required by this
     Agreement to be performed or complied with by such Seller by the time of
     the Closing, except for breaches of such representations and warranties and
     covenants that, in the aggregate, together with all information disclosed
     in any supplements, modifications and updates to the Schedules by Sellers
     prior to the Closing as permitted by this Agreement, would not have a
     Material Adverse Effect; and each Seller shall have delivered to Buyer a
     certificate dated the Closing Date and signed by a Vice President of it
     confirming the foregoing;

          (ii)   No injunction or order of any court or administrative agency of
     competent jurisdiction shall be in effect as of the Closing which restrains
     or prohibits the consummation of the Purchase;

          (iii)  Any applicable waiting period under the Hart-Scott-Rodino
     Antitrust Improvements Act of 1976, as amended (the "HSR Act"), shall have
     expired or been terminated;

          (iv)   Each of FMC, Harsco and UDLP (as appropriate) shall have
     executed and delivered each of the Ancillary Agreements to which it is a
     party;

          (v)    Since the date of the Latest Financials, and except as set
     forth on Schedule 3(a)(v) hereto or the other Schedules hereto, there shall
     have been no change in the Business, or the assets, liabilities or
     financial condition of UDLP, its Subsidiaries and Foreign Affiliates, taken
     as a whole, which would result in a Material Adverse Effect (it


                                      -8-
<PAGE>
 
     being understood that the failure to be awarded, or the failure to receive
     government funding for, any contract currently under proposal before or
     after the date hereof does not and shall not constitute a failure of the
     condition set forth in this Section 3(a)(v));

          (vi)   All Financing Obligations (other than the Continuing LC
     Obligations) shall have been finally repaid in full, terminated or
     reflected in the computation of the Adjusted Net Worth Amount on the
     Closing Statement and Buyer shall have been provided evidence reasonably
     acceptable to Buyer that any and all Liens securing such Financing
     Obligations as have been repaid or terminated shall have been released and
     terminated;

          (vii)  Each Seller shall have delivered to Buyer an affidavit, dated
     not more than thirty (30) days prior to the Closing Date, in accordance
     with Code Section 1445(b)(2) and Treasury Regulation section 1.1445-
     2(b)(2), which affidavit certifies that such Seller is not a foreign
     person; and

          (viii) The form and substance of all instruments and documents
     required to consummate the transactions contemplated by this Agreement
     shall have been reasonably satisfactory to Buyer and its counsel.

          (b)  Each Seller's Obligation. The obligation of each Seller to sell
and deliver or cause to be sold and delivered the Interests to Buyer is subject
to the satisfaction (or waiver by such Seller) as of the Closing of the
following conditions:

          (i)    The representations and warranties of Buyer made in this
     Agreement shall be true and correct in all material respects as of the date
     hereof and on and as of the Closing Date, as though made on and as of the
     Closing Date, except to the extent of changes or developments contemplated
     by the terms of this Agreement and except for representations and
     warranties that speak as of a specific date or time (which need only be
     true and correct as of such date or time), and Buyer shall have performed
     or complied with all obligations and covenants required by this Agreement
     to be performed or complied with by Buyer by the time of the Closing,
     except for breaches of such representations and warranties and covenants
     that, in the aggregate, would not have a material adverse effect on the
     ability of Buyer to perform its obligations under this Agreement, the
     Ancillary Agreements and the other agreements contemplated hereby and
     thereby at and after the Closing; and Buyer shall have delivered to each
     Seller a certificate dated the Closing Date and signed by a Vice President
     of it confirming the foregoing;

          (ii)   No injunction or order of any court or administrative agency of
     competent jurisdiction shall be in effect as of the Closing which restrains
     or prohibits the consummation of the Purchase;

          (iii)  Any waiting period under the HSR Act shall have expired or been
     terminated;

          (iv)   Buyer shall have executed and delivered each of the Ancillary
     Agreements to which it is a party; and

                                      -9-
<PAGE>
 
          (v)  Buyer shall have obtained the Substitute Letters of Credit in
     accordance with the provisions of Section 7(e) below.

          4.   Representations and Warranties of Sellers.

          4A.  Representations and Warranties of FMC.  FMC represents and
warrants to Buyer as follows:

          (a)  Authority; No Conflicts. FMC is a corporation duly organized,
validly existing and in good standing under the laws of the State of Delaware.
FMC has all requisite corporate power and authority to enter into this Agreement
and such Ancillary Agreements, to the extent it is a party thereto, as are
contemplated hereby to be executed and delivered by it and to consummate the
transactions contemplated hereby and thereby. All corporate acts and other
proceedings required to be taken by FMC to authorize the execution, delivery and
performance of this Agreement and such Ancillary Agreements, to the extent it is
a party thereto, and the consummation of the transactions contemplated hereby
and thereby, have been or will have been at or prior to the Closing duly and
properly taken. This Agreement has been duly executed and delivered by FMC, and
such Ancillary Agreements as are contemplated hereby to be executed and
delivered by FMC will, to the extent it is a party thereto, be duly and validly
executed and delivered by FMC, as applicable. This Agreement and such Ancillary
Agreements constitute, or will constitute, as the case may be, valid and binding
obligations of FMC, to the extent it is a party thereto, enforceable against FMC
in accordance with their respective terms. Except as set forth on Schedule
4C(a)(ii) and except for any consents, authorizations or approvals that are
required under the HSR Act or that may be required solely by reason of Buyer's
status, the execution and delivery of this Agreement and such Ancillary
Agreements as are contemplated hereby to be executed and delivered by FMC do not
or will not, as the case may be, and the consummation by FMC of the transactions
contemplated hereby and thereby and compliance by it with the terms thereof will
not, conflict with, or result in any violation of or default under, or give rise
to a right of termination, cancellation or acceleration of any obligation or to
loss of a benefit under, or result in the creation of any lien, claim,
encumbrance, security interest, option, charge or restriction of any kind upon
any of the assets of UDLP or any of its Subsidiaries under, or require any
consent, authorization or approval under any provision of (A) the certificate of
limited partnership or other organizational documents of UDLP or any of its
Subsidiaries or Foreign Affiliates, (B) any Material Contract to which UDLP or
any Subsidiary or Foreign Affiliate is a party or (C) any material judgment,
order or decree or any material statute, law, ordinance, rule or regulation
applicable to UDLP or any of its Subsidiaries or their respective assets.

          (b)  Ownership of the Interests. FMC is the sole general partner of
UDLP and holds 100% of the outstanding general partnership interests of UDLP.
The sale and transfer of the Interests owned by FMC to Buyer pursuant to this
Agreement will vest in Buyer all right, title and interest in such Interests,
free and clear of all adverse claims or other Lien, other than adverse claims
created by or through or suffered by Buyer.

                                      -10-
<PAGE>
 
          4B.  Representations and Warranties of Harsco.  Harsco represents and
warrants to Buyer as follows:

          (a)  Authority; No Conflicts. Each of HUC and Harsco Corporation
(each, a "Harsco Party") is a corporation duly organized, validly existing and
in good standing under the laws of the jurisdiction of its incorporation. Each
Harsco Party has all requisite corporate power and authority to enter into this
Agreement and such Ancillary Agreements, to the extent it is a party thereto, as
are contemplated hereby to be executed and delivered by it and to consummate the
transactions contemplated hereby and thereby. All corporate acts and other
proceedings required to be taken by each Harsco Party to authorize the
execution, delivery and performance of this Agreement and such Ancillary
Agreements, to the extent it is a party thereto, and the consummation of the
transactions contemplated hereby and thereby, have been or will have been at or
prior to the Closing duly and properly taken. This Agreement has been duly
executed and delivered by each Harsco Party, and such Ancillary Agreements as
are contemplated hereby to be executed and delivered by each Harsco Party will,
to the extent it is a party thereto, be duly and validly executed and delivered
by such Harsco Party, as applicable. This Agreement and such Ancillary
Agreements constitute, or will constitute, as the case may be, valid and binding
obligations of each Harsco Party, to the extent it is a party thereto,
enforceable against each Harsco Party, as applicable, in accordance with their
respective terms. Except as set forth on Schedule 4C(a)(ii) and except for any
consents, authorizations or approvals that are required under the HSR Act or
that may be required solely by reason of Buyer's status, the execution and
delivery of this Agreement and such Ancillary Agreements as are contemplated
hereby to be executed and delivered by each Harsco Party do not or will not, as
the case may be, and the consummation by each Harsco Party of the transactions
contemplated hereby and thereby and compliance by it with the terms thereof will
not, conflict with, or result in any violation of or default under, or give rise
to a right of termination, cancellation or acceleration of any obligation or to
loss of a benefit under, or result in the creation of any lien, claim,
encumbrance, security interest, option, charge or restriction of any kind upon
any of the assets of UDLP or any of its Subsidiaries under, or require any
consent, authorization or approval under any provision of (A) the certificate of
limited partnership or other organizational documents of UDLP or any of its
Subsidiaries or Foreign Affiliates, (B) any Material Contract to which UDLP or
any Subsidiary or Foreign Affiliate is a party or (C) any material judgment,
order or decree or any material statute, law, ordinance, rule or regulation
applicable to UDLP or any of its Subsidiaries or their respective assets.

          (b)  Ownership of the Interests. HUC is the sole limited partner of
UDLP and holds 100% of the outstanding limited partnership interests of UDLP.
The sale and transfer of the Interests owned by HUC to Buyer pursuant to this
Agreement will vest in Buyer all right, title and interest in such Interests,
free and clear of all adverse claims or other Lien, other than adverse claims
created by or through or suffered by Buyer.

          4C.  Representations and Warranties of Sellers. Sellers hereby jointly
and severally represent and warrant to Buyer as follows:

          (a)  Authority; No Conflicts.

                                      -11-
<PAGE>
 
          (i)  UDLP is a limited partnership duly organized, validly existing
     and in good standing under the laws of the State of Delaware. UDLP has all
     requisite partnership power and authority to enter into the Ancillary
     Agreements, to the extent it is a party thereto, as are contemplated hereby
     to be executed and delivered by it and to consummate the transactions
     contemplated thereby. All partnership acts and other proceedings required
     to be taken by UDLP to authorize the execution, delivery and performance of
     such Ancillary Agreements, and the consummation of the transactions
     contemplated thereby, have been or will have been at or prior to the
     Closing duly and properly taken. Such Ancillary Agreements as are
     contemplated hereby to be executed and delivered by UDLP will, to the
     extent it is a party thereto, be duly and validly executed and delivered by
     UDLP. Such Ancillary Agreements will constitute valid and binding
     obligations of UDLP, to the extent it is a party thereto, enforceable
     against UDLP in accordance with their respective terms.

          (ii) Except as set forth on Schedule 4C(a)(ii) and except for any
     consents, authorizations or approvals that are required under the HSR Act
     or that may be required solely by reason of Buyer's status, the execution
     and delivery of such Ancillary Agreements as are contemplated hereby to be
     executed and delivered by UDLP do not or will not, as the case may be, and
     the consummation by UDLP of the transactions contemplated thereby and
     compliance by it with the terms thereof will not, conflict with, or result
     in any violation of or default under, or give rise to a right of
     termination, cancellation or acceleration of any obligation or to loss of a
     benefit under, or result in the creation of any lien, claim, encumbrance,
     security interest, option, charge or restriction of any kind upon any of
     the assets of UDLP or any of its Subsidiaries or Foreign Affiliates under,
     or require any consent, authorization or approval under any provision of
     (A) the certificate of limited partnership or other organizational
     documents of UDLP or any of its Subsidiaries or Foreign Affiliates, (B) any
     Material Contract relating to the Business to which UDLP or any Subsidiary
     or Foreign Affiliate is a party or (C) any material judgment, order or
     decree or any material statute, law, ordinance, rule or regulation
     applicable to UDLP or any of its Subsidiaries or Foreign Affiliates or
     their assets.

          (b)  Ownership of the Interests. Except for the Interests owned by FMC
and HUC to be purchased by Buyer pursuant to the terms hereof, UDLP has no
outstanding partnership interests or other equity securities or any outstanding
options, warrants or other rights exercisable for, or any securities convertible
into or exchangeable for, any such partnership interest or equity securities.
Except as set forth on Schedule 4C(b), there are no outstanding agreements,
securities or other commitments (other than this Agreement) pursuant to which
any of Sellers and UDLP is or may become obligated to issue, sell, purchase,
return or redeem any Interests or other securities of UDLP.

          (c)  Subsidiaries and Foreign Affiliates. Schedule 4C(c)-1 attached
hereto sets forth the name and jurisdiction of incorporation of each Subsidiary
of UDLP and the persons owning its outstanding capital stock. Each Subsidiary
and each Foreign Affiliate is duly organized, validly existing and, to the
extent applicable, in good standing under the laws of the jurisdiction of its

                                      -12-
<PAGE>
 
incorporation.  All of the outstanding shares of capital stock of each
Subsidiary are validly issued, fully paid and non-assessable.  Schedule 4C(c)-2
sets forth the name and nature of certain foreign entities in which UDLP has a
direct or indirect ownership interest (the "Foreign Affiliates") and the
ownership of the equity interests in such entities.  Except as set forth on
Schedule 4C(c)-1, Schedule 4C(c)-2 or the other Schedules hereto, neither UDLP
nor any Subsidiary owns or holds the right to acquire any shares of stock or any
other investment or equity interest in any other corporation, partnership, joint
venture or other entity and all such shares and other interests reflected on
such Schedules are owned by UDLP or another Subsidiary free and clear of any
Lien or other material encumbrance and are not subject to any option or right to
purchase any such shares and each Foreign Affiliate has no Subsidiaries.
Schedule 4C(c)-1 or Schedule 4C(c)-2 sets forth the number, type and class of
the outstanding shares of capital stock or other ownership interests or
securities of each Subsidiary and Foreign Affiliate of UDLP and the name of the
record and beneficial owner of each share of capital stock or other equity
interests or securities of each Subsidiary and Foreign Affiliate of UDLP.
Except as set forth on Schedule 4C(c)-1, Schedule 4C(c)-2 or the other Schedules
hereto, there are no outstanding options, warrants or other rights exercisable
for, or securities convertible into or exchangeable for, any capital stock or
other ownership interests or securities of any Subsidiary or Foreign Affiliate
of UDLP, any other commitments or agreements providing for the issuance of
additional shares, the sale of treasury shares, or for the repurchase or
redemption of shares of any Subsidiary's or Foreign Affiliate's capital stock,
or any agreements of any kind which may obligate any Subsidiary or Foreign
Affiliate to issue, purchase, register for sale, redeem or otherwise acquire any
of its securities or interests.

          (d)  Financial Statements.  Schedule 4C(d) sets forth (i) the audited
consolidated balance sheets of UDLP as of December 31, 1995 and December 31,
1996, and the related consolidated statements of operations and cash flows for
UDLP for the fiscal years ended December 31, 1994, December 31, 1995 and
December 31, 1996, together with the auditors' report thereon and (ii) the
unaudited consolidated balance sheet of UDLP as of June 30, 1997 and related
consolidated statements of operations and cash flows for UDLP for the six-month
period then ended (the "Latest Financials"),  in each case together with the
notes thereto (collectively, the "Financial Statements"). The consolidated
balance sheet of UDLP as of the fiscal period ended June 30, 1997 is referred to
herein as the "June 30 Balance Sheet." The Financial Statements have been
derived from the accounting books and records of UDLP, were prepared in the
ordinary course of business and present fairly in all material respects the
financial condition of UDLP as of the dates of such Financial Statements and the
results of operations and cash flows of UDLP and its consolidated Subsidiaries
for the periods indicated in accordance with the Applicable Accounting
Principles.

          (e)  Title to Tangible Assets Other than Real Property Interests. UDLP
and its Subsidiaries have good and valid title to all material tangible assets
reflected in the Latest Financials, except those sold or otherwise disposed of
since the date of the Latest Financials in the ordinary course of business, free
and clear of all mortgages, liens, security interests or encumbrances of any
nature whatsoever (collectively, "Liens"), except (i) such as are disclosed on
Schedule 4C(e) or the other Schedules hereto, (ii) mechanics', carriers',
workmen's, repairmen's or other like liens arising or incurred in the ordinary
course of business for which reserves have been established in accordance with
generally accepted accounting principles, equipment leases with third parties
entered into in the

                                     -13-
<PAGE>
 
ordinary course of business, liens for taxes, and other governmental charges
which are not due and payable or which may thereafter be paid without penalty
for which reserves have been established in accordance with generally accepted
accounting principles and (iii) other imperfections of title, restrictions or
encumbrances, if any, which would not, individually or in the aggregate,
materially impair the use or value of any such asset (the items in clauses (i)-
(iii) being referred to herein collectively as "Permitted Liens"). The material
tangible assets used in the operation of the Business, taken as a whole, are in
normal operating condition and repair (subject to normal wear and tear). This
Section 4C(e) does not relate to real property or interests in real property, it
being the intent of the parties that such items are the subject of Section
4C(f).

          (f)  Title to Real Property. The term "Owned Properties" as used
herein means all real property and interests in real property owned in fee by
UDLP or a Subsidiary as set forth on Schedule 4C(f)-1 (each of such properties
being referred to individually as an "Owned Property"). Schedule 4C(f)-2 sets
forth a list of real properties leased by UDLP or a Subsidiary pursuant to
leases under which UDLP or a Subsidiary has an annual base rental obligation in
excess of $250,000 (individually, a "Leased Property"). An Owned Property or
Leased Property shall be sometimes referred to herein individually as a
"Property" and collectively as the "Properties". UDLP or a Subsidiary has fee
simple title to the Owned Properties, and has a valid leasehold interest in each
of the Leased Properties, in each case free and clear of all mortgages, liens,
security interests, easements, covenants, rights-of-way and other similar
restrictions of any nature whatsoever, except (i) Permitted Liens (as defined in
Section 4C(e) above), (ii) easements, covenants, conditions, rights-of-way and
other restrictions of record that are disclosed in any commitment for title
insurance or other title report previously delivered or made available to Buyer,
(iii) any conditions that may be shown by a current, accurate survey or physical
inspection of the relevant Property made prior to the Closing which do not
materially and adversely affect the use as currently conducted of the Owned
Properties, (iv) existing leases, licenses and possession or occupancy
agreements, if any, (v) (A) zoning, building, fire, health, entitlement and
other land use laws, ordinances, rules and safety regulations and other similar
restrictions, (B) mortgages, liens, security interests or encumbrances that have
been placed by any developer, landlord or other third party on property over
which UDLP or a Subsidiary has easement rights or on any Leased Property and
subordination or similar agreements relating thereto and (C) unrecorded
easements, covenants, rights-of-way, liens or other restrictions which do not
materially and adversely affect the use as currently conducted of the Owned
Properties, (vi) acts done or suffered to be done by, and judgments against,
Buyer and those claiming by, through or under Buyer, (vii) any and all orders,
decrees, awards or judgments related to any eminent domain or condemnation
proceedings which do not materially and adversely affect the use as currently
conducted of the Owned Properties, (viii) other liens, security interests,
easements, covenants and restrictions of any nature whatsoever which
individually or in the aggregate do not materially and adversely affect the
value or use as currently conducted of the Owned Properties and (ix) with
respect to the lease for the property in Aiken, South Carolina listed on
Schedule 4C(f)-2, an "industrial revenue bond", a copy of which has been made
available to Buyer. Except as set forth on Schedule 4C(f)-1, (i) all
improvements located on the Property are, in the aggregate, in normal operating
condition and repair (normal wear and tear excepted) and, to the knowledge of
Sellers, are free from material structural defect and (ii) there is not now
pending any condemnation or eminent

                                     -14-
<PAGE>
 
domain proceeding affecting the Property or any portion thereof, nor, to the
knowledge of Sellers, is any such proceeding threatened by any governmental
authority.

          (g)  Intellectual Property. The Intellectual Property of UDLP that is
described in clauses (i), (ii) and (iii) of Section 1(a)(vii) is listed on
Schedule 4C(g). Except as disclosed on Schedule 4C(g) or the other Schedules
hereto, UDLP or a Subsidiary or Foreign Affiliate owns or has the right to use,
without payment to any other party, all material Intellectual Property used in
its business. Except as set forth on Schedule 4C(g) or the other Schedules
hereto, no material claims are pending in writing or, to the knowledge of
Sellers, threatened in writing against UDLP or a Subsidiary or Foreign Affiliate
as of the date of this Agreement by any person with respect to the ownership or
use of any of the Intellectual Property owned by UDLP and used in the Business.
Except as set forth on Schedule 4C(g) or the other Schedules hereto, no material
licenses, sublicenses or agreements pertaining to any of the Intellectual
Property owned by UDLP and used in the Business have been granted or entered
into by UDLP or a Subsidiary or Foreign Affiliate. None of Sellers and UDLP has
received any notices of any infringement by any third party with respect to any
of the Intellectual Property owned by UDLP and used in the Business. Except as
set forth on Schedule 4C(g) or the other Schedules hereto, to the knowledge of
Sellers, the operation of the Business does not infringe upon any proprietary
right or other Intellectual Property right of any person in any material
respect. All rights pertaining to Intellectual Property licensed to UDLP by FMC
pursuant to the FMC Intellectual Property Agreement are duly and validly held by
FMC, free and clear of all material Liens. All rights pertaining to Intellectual
Property to be licensed to UDLP by Harsco pursuant to the Harsco Intellectual
Property Agreement are duly and validly held by Harsco, free and clear of all
material Liens.

          (h)  Material Contracts. Schedule 4C(h) and the other Schedules hereto
set forth as of the date of this Agreement each of the following types of
written contracts to which UDLP or any Subsidiary or Foreign Affiliate is a
party:

               (i)   any employment agreement or employment contract with any
     officer or director of UDLP (excluding any independent contractor) that has
     future liability for cash compensation in excess of $200,000 per annum and
     is not terminable by notice of not more than 60 calendar days for a cost of
     less than $200,000;

               (ii)  any employee collective bargaining agreement;

               (iii) any covenant not to compete that materially impairs the
     Business;

               (iv)  any lease or similar agreement under which UDLP or any
     Subsidiary or Foreign Affiliate is a lessor or sublessor of, or makes
     available for use by any third party, any real property owned or leased by
     UDLP or any Subsidiary or Foreign Affiliate or any portion of premises
     otherwise occupied by UDLP or any Subsidiary, in each case which has future
     liability in excess of $250,000 per annum and is not terminable by notice
     of not more than 60 calendar days for a cost of less than $250,000;

                                      -15-
<PAGE>
 
               (v) any lease or similar agreement under which (A) UDLP or any
     Subsidiary or Foreign Affiliate is lessee of, or holds or uses, any
     machinery, equipment, vehicle or other tangible personal property owned by
     a third party or (B) UDLP or any Subsidiary or Foreign Affiliate is a
     lessor or sublessor of, or makes available for use by any third party, any
     tangible personal property owned or leased by UDLP or any Subsidiary or
     Foreign Affiliate, in each case which has future liability in excess of
     $500,000 per annum and is not terminable by notice of not more than 60
     calendar days for a cost of less than $500,000;

               (vi) any agreement or contract under which UDLP has borrowed or
     loaned any money, any note, bond, indenture or other evidence of
     indebtedness or any direct or indirect guarantee of such indebtedness of
     others (other than endorsements for the purpose of collection, loans made
     to employees for relocation, travel or other employment-related purposes,
     or purchases of equipment or materials made under conditional or instalment
     sales contracts, in each case in the ordinary course of business) which,
     individually or in the aggregate, has an outstanding principal amount in
     excess of $500,000;

               (vii) any agreement or contract under which either Seller or any
     other person has directly or indirectly guaranteed indebtedness,
     liabilities or obligations of UDLP or any Subsidiary or Foreign Affiliate
     (other than endorsements for the purpose of collection in the ordinary
     course of business and all Guaranties), in each case having an outstanding
     principal amount or aggregate future liability in excess of $1,000,000;

               (viii) any contract or agreement for the purchase of supplies,
     goods, products or other personal property or for the receipt of services
     which involves an unfulfilled obligation of UDLP or any Subsidiary or
     Foreign Affiliate in excess of $5,000,000;

               (ix) any contract or agreement (including the U.S. Department of
     Defense and any other U.S. military purchasing authority), other than any
     Inactive Contracts, for the sale of supplies, goods, products or other
     personal property or for the furnishing of services which involves an
     unfulfilled obligation of UDLP or any Subsidiary in excess of $25,000,000;

               (x) any contract or agreement which provides for the procurement
     by UDLP of consulting, sales representative, marketing or lobbying services
     and which involves an unfulfilled obligation of UDLP in excess of $500,000;

               (xi) any joint venture, teaming, co-production or partnership
     contract or agreement involving an unfulfilled obligation of UDLP in excess
     of $5,000,000;

               (xii) any agreement committing UDLP or any of its Subsidiaries to
     purchase or sell any property or asset outside the ordinary course of
     business for consideration in excess of $1,000,000; and

               (xiii) any agreement between UDLP or one or more of its
     Subsidiaries or Foreign Affiliates and any Seller or any Affiliate of any
     Seller (other than UDLP or any of its

                                      -16-
<PAGE>
 
     Subsidiaries or Foreign Affiliates) which involves an unfulfilled
     obligation, individually or in the aggregate, in excess of $1,000,000.

          Sellers have delivered to, or made available for inspection by, Buyer 
a copy of each contract, lease, license, instrument or other agreement listed on
Schedule 4C(h) as amended to date, other than modifications or amendments to
U.S. government contracts since June 30, 1997 as would not materially and
adversely affect the value of such contracts.  Except as disclosed on Schedule
4C(h) or the other Schedules hereto, UDLP or a Subsidiary or Foreign Affiliate
has performed all material obligations required to be performed by it to date
under each contract, lease, license, commitment, instrument or other agreement
of UDLP or such Subsidiary described on Schedule 4C(h) (collectively, the
"Material Contracts") and is not (with or without the lapse of time or the
giving of notice, or both) in material breach or material default thereunder
and, to the knowledge of Sellers, no other party thereto is (with or without
lapse of time or the giving of notice, or both) in material default under any
Material Contract.  Except as set forth on Schedule 4C(h), all of the Material
Contracts are (i) in full force and effect and (ii) to the knowledge of Sellers,
represent the legal, valid and binding obligations of the other parties thereto
and are enforceable against such parties in accordance with their terms.

          (i) Litigation; Decrees. Schedule 4C(i) and the other Schedules hereto
set forth, all lawsuits, claims and judicial or administrative proceedings
(excluding lawsuits, claims or proceedings for workers' compensation) pending
or, to the knowledge of Sellers, threatened against UDLP or a Subsidiary or
Foreign Affiliate or involving any of its respective properties, assets,
operations or businesses and which (A) involve a claim against UDLP or a
Subsidiary or Foreign Affiliate of, or which involve an unspecified amount which
could reasonably be expected to result in liability of, more than $250,000 or
(B) seek any material injunctive relief which would affect Buyer's acquisition
or ownership of the Interests or the operation of the Business. Neither UDLP nor
any Subsidiary or Foreign Affiliate is in material default under any material
judgment, order or decree applicable to it of any court, administrative agency
or commission or other governmental authority or instrumentality, domestic or
foreign. Schedule 7(f) sets forth certain pending lawsuits or claims that will
be retained by a particular Seller (as indicated thereon) from and after the
Closing.

          (j) Compliance with Applicable Laws. Except as set forth on Schedule
4C(j) or the other Schedules hereto, (i) UDLP and its Subsidiaries and Foreign
Affiliates are, and since January 1, 1994 have been, in compliance in all
material respects with all applicable material statutes, laws, ordinances,
rules, orders and regulations of any governmental authority or instrumentality
and (ii) since December 31, 1996, neither UDLP nor any Subsidiary has received
any written communication from a governmental authority that alleges that it is
not in compliance in all material respects with any material federal, state,
foreign or local laws, rules and regulations. This Section 4C(j) does not relate
to environmental matters, Government Contracts and tax matters, it being the
intent of the parties that environmental matters, Government Contract matters
and tax matters are the subject of Sections 4C(n), 4C(q) and 4C(l),
respectively.

          (k) Employee Benefit Plans.  Except as set forth on Schedule 4C(k):

                                      -17-
<PAGE>
 
               (i) Schedule 4C(k)-1 lists all of the material employee benefit
     plans, programs and arrangements (including each severance or other
     arrangement or policy and each plan, arrangement, program, agreement or
     commitment providing for insurance coverage (including without limitation
     any self-insured arrangements), disability benefits, supplemental
     unemployment benefits, vacation benefits, retirement benefits, life,
     health, accident benefits (including without limitation any "voluntary
     employees' beneficiary association" as defined in Section 501(c)(9) of the
     Code providing for the same or other benefits) or for deferred
     compensation, profit-sharing bonuses, stock options, stock appreciation
     rights, stock purchases or other forms of incentive compensation or post-
     retirement insurance, compensation or benefits) maintained or contributed
     to by UDLP with respect to current or former employees of UDLP or any of
     its Subsidiaries (including the Defense Segment Plan referred to in Section
     8(h)(iii)) (the "UDLP Employee Benefit Plans") and Schedule 4C(k)-2 lists
     all of such material employee benefits plans, programs and arrangements
     maintained or contributed to by FMC in which current or former employees of
     UDLP or any of its Subsidiaries participate (the "FMC Employee Benefit
     Plans"). Sellers have delivered to, or made available for inspection by,
     Buyer a copy of each UDLP Employee Benefit Plan and the defined benefit
     pension plans of FMC covering employees of UDLP and the Transferred
     Employees. Except as provided in clause (vi) of this Section 4C(k), Sellers
     make no representations or warranties in this Agreement regarding or
     relating to any of the FMC Employee Benefit Plans.

               (ii) All UDLP Employee Benefit Plans which are "employee benefit
     plans" (as defined in Section 3(3) of the Employee Retirement Income
     Security Act of 1974, as amended ("ERISA")) are in compliance in all
     material respects with the applicable requirements of ERISA, the Code and
     all other applicable law.

               (iii) Each UDLP Employee Benefit Plan or its predecessor plan
     which is intended to qualify under Section 401(a) of the Code has received
     a favorable determination letter that it is so qualified and that its trust
     is exempt from taxation.

               (iv) All contributions and payments with respect to each UDLP
     Employee Benefit Plan have been timely made when due and there are no
     funding deficiencies (including accumulated funding deficiencies) (as
     defined in ERISA and the Code).

               (v) All ERISA reporting and disclosure obligations have been
     satisfied in all material respects with respect to each UDLP Employee
     Benefit Plan.

               (vi) UDLP and each UDLP Employee Benefit Plan and, with respect
     to employees and former employees of UDLP and its Subsidiaries, each FMC
     Employee Benefit Plan has complied in all material respects with its
     obligations under Section 4980B of the Code and Section 601 et seq. of
     ERISA ("COBRA").

               (vii) To the knowledge of Sellers, with respect to each UDLP
     Employee Benefit Plan: (a) there have not been any prohibited transactions
     (as defined in Section 406 of ERISA

                                      -18-
<PAGE>
 
     or Section 4975 of the Code); (b) no fiduciary has any liability for breach
     of fiduciary duty; and (c) no investigations, suits, or material claims are
     pending.

               (viii) Sellers have delivered or made available to Buyer copies
     of the following documents in connection with each UDLP Employee Benefit
     Plan: (a) plan document and all amendments; (b) current summary plan
     descriptions; (c) the most recent Internal Revenue Service favorable
     determination letter with respect to each UDLP Employee Benefit Plan
     intended to be qualified under the Code; and (d) the most recent IRS Form
     5500.

               (ix) UDLP does not contribute to any "multiemployer plan," as
     defined in Section 3(37) or 4001(a)(3) of ERISA, nor has UDLP at any time
     contributed to, or been obligated to contribute to, any such multiemployer
     plan.

               (x) The funding method used in connection with each UDLP Employee
     Benefit Plan that is an "employee pension benefit plan" as defined in
     Section 3(2) of ERISA (each, a "Pension Plan") which is subject to the
     minimum funding requirements of ERISA is acceptable under law, and the
     actuarial assumptions used in connection with funding each such plan are
     reasonable. As of the Closing Date, the "amount of unfunded benefit
     liabilities" as defined in Section 4001(a)(18) of ERISA of each Pension
     Plan (but excluding from the definition of "current value" of "assets" of
     such Pension Plan accrued but unpaid contributions) did not exceed zero.

               (xi) UDLP and its Subsidiaries have not engaged in, nor are
     successors or parent corporations to an entity that has engaged in, a
     transaction described in Section 4069 of ERISA. There has been no
     "reportable event" (as defined in Section 4043(b) of ERISA and the PBGC
     regulations under such Section) with respect to any Pension Plan and no
     analogous event under applicable foreign law. No filing has been made by
     UDLP or either Seller with the PBGC, and no proceeding has been commenced
     by the PBGC, to terminate any Pension Plan. No condition exists and no
     event has occurred that could constitute grounds for the termination of any
     Pension Plan by the PBGC. UDLP has not at any time, (1) ceased operations
     at a facility so as to become subject to the provisions of Section 4062(e)
     of ERISA or analogous foreign law, (2) withdrawn as a substantial employer
     so as to become subject to the provisions of Section 4063 of ERISA or
     analogous foreign law, or (3) ceased making contributions on or before the
     Closing Date to any Pension Plan subject to Section 4064(a) of ERISA or
     analogous foreign law to which UDLP made contributions during the six years
     prior to the Closing Date.

                (xii) There is no contract, agreement, plan or arrangement
     covering any employee or former employee of UDLP that, individually or
     collectively, provides for the payment prior to or in connection with this
     transaction by UDLP of any amount (i) that is not deductible under Section
     162(a)(1) or 404 of the Code or (ii) that is an "excess parachute payment"
     pursuant to Section 280G of the Code.

                                      -19-
<PAGE>
 
               (xiii) Each material trust agreement, annuity contract or other
     funding instrument maintained by UDLP and related to a UDLP Employee
     Benefit Plan has been maintained in all material respects in accordance
     with its terms and applicable law.

               (xiv) There is no material action, order, writ, injunction,
     judgment or decree outstanding or claim, suit, litigation, proceeding,
     arbitral action, governmental audit or investigation relating to or seeking
     benefits under any UDLP Employee Benefit Plan that is pending or, to the
     knowledge of Sellers, threatened against UDLP or any UDLP Employee Benefit
     Plan.

               (xv) Neither UDLP nor Sellers has any legally binding commitment
     to create any additional employee benefit plans which are intended to cover
     UDLP employees or to amend or modify any existing UDLP Employee Benefit
     Plan which would result in a material increase in the costs to UDLP of such
     Plan.

               (xvi) No UDLP Employee Benefit Plan holds as an asset any
     interest in any annuity contract, guaranteed investment contract or any
     other investment or insurance contract issued by an insurance company that,
     to the knowledge of Sellers, or UDLP is the subject of bankruptcy,
     conservatorship or rehabilitation proceedings.

               (xvii) Neither the execution and delivery of this Agreement by
     Sellers nor the consummation of the transactions contemplated hereby or the
     related transactions will result in the acceleration or creation of any
     rights of any person to benefits under any UDLP Employee Benefit Plan
     (including, without limitation, the acceleration of the vesting or
     exercisability of any stock options, the acceleration of the vesting of any
     restricted stock, the acceleration of the accrual or vesting of any
     benefits under any Pension Plan or the acceleration or creation of any
     rights under any severance, parachute or change in control agreement).

               (xviii) No event has occurred in connection with which UDLP, any
     of its Subsidiaries or any UDLP Employee Benefit Plan, directly or
     indirectly, could be subject to any material liability (A) under any
     statute, regulation or governmental order relating to any UDLP Employee
     Benefit Plan or (B) pursuant to any obligation of UDLP or any of its
     Subsidiaries to indemnify any person against liability incurred under any
     such statute, regulation or order as it relates to the UDLP Employee
     Benefit Plans.

               (xix) None of the Subsidiaries employs any employees or has any
     obligation to contribute to any of the UDLP Employee Benefit Plans.

          (l) Taxes. Except as otherwise provided in Schedule 4C(1) and except
as would not result in a liability to UDLP or its Subsidiaries in excess of
amounts accrued on the June 30 Balance Sheet or the Closing Statement:

                                      -20-
<PAGE>
 
               (i) UDLP and its Subsidiaries have filed, or have been included
     in, all material Tax Returns (as defined below) required to be filed by
     them on or before the Closing Date. To the knowledge of Sellers, the
     Foreign Affiliates have filed, or have been included in, all material Tax
     Returns required to be filed by them on or before the Closing Date.

               (ii) All material Taxes due and payable by UDLP and its
     Subsidiaries (whether or not shown on any Tax Return) have been timely paid
     in full. To the knowledge of Sellers, all material Taxes due and payable by
     the Foreign Affiliates (whether or not shown on any Tax Return) have been
     timely paid in full.

               (iii) No claim has ever been made in writing by a taxing
     authority in a jurisdiction where UDLP or any of its Subsidiaries do not
     file Tax Returns that any of UDLP and its Subsidiaries are or may be
     subject to taxation in a material amount by that jurisdiction. To the
     knowledge of Sellers, no claim has ever been made in writing by a taxing
     authority in a jurisdiction where any of the Foreign Affiliates do not file
     Tax Returns that any of the Foreign Affiliates are or may be subject to
     taxation in any material amount by that jurisdiction.

               (iv) None of UDLP's Subsidiaries or Foreign Affiliates which is a
     corporation has filed a consent under Code Section 341(f) concerning
     collapsible corporations.

               (v) None of UDLP, its Subsidiaries, and its Foreign Affiliates
     has been a United States real property holding corporation within the
     meaning of Code Section 897(c)(2) during the applicable period specified in
     Code Section 897(c)(1)(A)(ii).

               (vi) None of UDLP, its Subsidiaries and, to the knowledge of
     Sellers, the Foreign Affiliates, (A) has been a member of any affiliated
     group filing a consolidated federal income Tax Return and (B) has any
     liability for material Taxes of any person as defined in Section 7701(a)(1)
     of the Code (other than UDLP and its Subsidiaries) under Treas. Reg.
     (S)1.1502-6 (or any similar provision of state, local, or foreign law), as
     a transferee or successor or by contract of indemnity.

               (vii) As of the date hereof, UDLP, its Subsidiaries and, to the
     knowledge of Sellers, the Foreign Affiliates, have no material Tax
     deficiency or claim assessed or, to the knowledge of Sellers, proposed in
     writing against any of them, except to the extent that adequate liabilities
     or reserves with respect thereto are accrued on the Financial Statements in
     accordance with generally accepted accounting principles (or, with respect
     to the Foreign Affiliates, on their financial statements determined in
     accordance with United States generally accepted accounting principles) or
     (i) such deficiency or claim is being contested in good faith by
     appropriate proceedings, (ii) no such accrual is required by generally
     accepted accounting principles and (iii) the nature and amount of the
     disputed Tax is set forth on Schedule 4C(1).

                                      -21-
<PAGE>
 
               (viii) As of the date hereof, there are no currently outstanding
     Tax examinations or Tax audits of any of UDLP and its Subsidiaries. To the
     knowledge of Sellers, as of the date hereof, there are no currently
     outstanding Tax examinations or Tax audits of the Foreign Affiliates.

               (ix) Neither UD United Defense International Sales Corporation
     nor UDLP Components, Limited has any investment in U.S. property within the
     meaning of Code Section 956. FMC-Arabia has an investment in U.S. property
     within the meaning of Code (S)956 represented by a loan to UDLP. To the
     knowledge of Sellers, the Foreign Affiliates have no other investments in
     U.S. property.

               (x) None of the property of UDLP or any of its Subsidiaries (A)
     is subject to a lease under (x) Section 168(f)(8) of the Internal Revenue
     Code of 1954, or (y) Code Section 7701(h), (B) secures any debt the
     interest on which is tax-exempt under Code Section 103(a), or (C) is tax-
     exempt use property within the meaning of Code Section 168(h).

               (xi) Neither UD United Defense International Sales Corporation
     nor UDLP Components, Limited nor, to the knowledge of Sellers, any of the
     Foreign Affiliates, is (i) engaged in a United States trade or business for
     federal Income Tax purposes; (ii) a passive foreign investment company
     within the meaning of the Code; or (iii) a foreign investment company
     within the meaning of the Code.

               (xii) To the knowledge of Sellers, none of UDLP, its Subsidiaries
     and Foreign Affiliates has participated in or cooperated with an
     international boycott within the meaning of Code Section 999 or has been
     requested to do so in connection with any transaction or proposed
     transaction.

               (xiii) Buyer would not be required to include any amount in gross
     income with respect to UD United Defense International Sales Corporation or
     UDLP Components, Limited pursuant to Code Section 951 if the taxable year
     of any of such entities was deemed to end on the Closing Date after the
     Closing.

               (xiv) Since their respective formations through the date hereof,
     UDLP and Armored Vehicle Technologies Associates have been qualified to be
     treated as partnerships for federal Income Tax purposes and neither UDLP
     nor any of its partners has taken a position inconsistent with such
     treatment with regard to any federal Income Tax.

               (xv) This Section 4(C)(1) contains the sole and exclusive
     representations and warranties of Sellers with respect to any Taxes or Tax
     matters, with the exclusion of those representations and warranties
     relating to Taxes to the extent set forth in Section 4C(e), Section 4C(f)
     and Section 4C(k).

          (m) Insurance. Attached hereto as Schedule 4C(m) is a summary of all
material insurance policies issued in favor of UDLP and the Subsidiaries.
Neither UDLP nor any of its

                                      -22-
<PAGE>
 
Subsidiaries has received (i) any written notice of cancellation of any policy
described on Schedule 4C(m) or refusal of coverage thereunder, (ii) any written
notice that any issuer of such policy has filed for protection under applicable
bankruptcy laws or is otherwise in the process of liquidating or has been
liquidated, or (iii) any other written notice that such policies are no longer
in full force or effect or that the issuer of any such policy is no longer
willing or able to perform its obligations thereunder.

          (n) Environmental Compliance.

          (i) To the knowledge of Sellers, except as set forth on Schedule 4C(n)
     hereto or the other Schedules hereto, as of the date hereof UDLP and the
     Subsidiaries are in compliance with all Environmental Requirements, except
     for such noncompliance as would not have a Material Adverse Effect.
     "Environmental Requirements" shall mean all federal, state and local
     statutes, regulations, ordinances, permits, approvals and licenses
     concerning pollution or protection of the environment, including without
     limitation all those relating to the presence, use, production, generation,
     handling, transportation, treatment, storage, disposal, distribution,
     labeling, testing, processing, discharge, release, threatened release,
     control or cleanup of any hazardous materials, substances or wastes, as
     such requirements are enacted and in effect on or prior to the date hereof.

          (ii) Except as set forth on Schedule 4C(n) or the other Schedules
     hereto, UDLP has not, since January 1, 1996, received any written notice,
     report or other communication regarding any material violation of
     Environmental Requirements, or any material liabilities, including any
     material investigatory, remedial or corrective obligations, relating to
     UDLP or its facilities arising under Environmental Requirements, except for
     any of the foregoing, the subject matter of which would not have a Material
     Adverse Effect.

          (iii) To the knowledge of Sellers, Sellers have delivered, or
     otherwise made available, to Buyer copies of all material written
     environmental reports, audits and assessments in Sellers' possession
     relating to any material environmental liabilities of UDLP or any of its
     Subsidiaries.

          (iv) This Section 4C(n) contains the sole and exclusive
     representations and warranties of Sellers with respect to any environmental
     matters, including without limitation any arising under any Environmental
     Requirements.

          (o) Undisclosed Liabilities. Except as set forth on Schedule 4C(o),
neither UDLP nor any of its consolidated Subsidiaries has any material liability
or obligation (whether absolute or contingent, liquidated or unliquidated, or
due or to become due) of a type required to be reflected on a balance sheet
prepared in accordance with Applicable Accounting Principles, except for
liabilities and obligations (i) reflected or reserved for on the balance sheet
included in the Latest Financials, (ii) disclosed or referred to on any of the
Schedules or (iii) that have arisen since or arise after the date of the Latest
Financials in the ordinary course of the operation of the Business

                                      -23-
<PAGE>
 
(including pursuant to contracts) and consistent with past practice (all of
which are current liabilities similar in type to those reflected on the balance
sheet included in the Latest Financials).

          (p) Absence of Certain Changes or Events. Since June 30, 1997, UDLP
and its Subsidiaries have operated the Business in the ordinary course,
consistent with past practices. Without limiting the foregoing, since June 30,
1997, except as disclosed on Schedule 4C(p), there has not been any (i) material
adverse change in the Business or the assets, liabilities or financial condition
of UDLP and its Subsidiaries, taken as a whole, (ii) except for normal periodic
increases in the ordinary course of business consistent with past practice,
increase in the compensation payable or to become payable by UDLP or its
Subsidiaries to any of their respective officers, employees or agents
(collectively, "Personnel") whose total compensation for services rendered to
UDLP or its Subsidiaries is currently at an annual rate of more than $100,000 or
any material bonus, incentive compensation, service award or other like benefit
granted, made or accrued, contingently or otherwise, for or to the credit of any
of the Personnel, (iii) material addition to or modification of the employee
benefit plans, arrangements or practices affecting Personnel, (iv) sale,
assignment or transfer of any material assets of UDLP or its Subsidiaries, taken
as a whole, other than in the ordinary course, (v) material change in accounting
methods or practices by UDLP or its Subsidiaries or (vi) revaluation by UDLP or
any of its Subsidiaries of any of their respective material assets.

          (q) Government Contracts.  Except as set forth on Schedule 4(C)(q):

          (i) Since January 1, 1994, neither the United States government
     (through relevant contracting officers or the U.S. Department of Justice)
     nor any prime contractor has notified UDLP or either Seller in writing that
     UDLP has breached or violated in any material respect any material statute
     or regulation pertaining to any Government Contract.

          (ii) Neither UDLP nor any of its Subsidiaries has been debarred or
     suspended from participation in the award of any Government Contract nor,
     to the knowledge of Sellers, has any debarment or suspension proceeding
     been initiated against UDLP or any of its Subsidiaries.

          (iii) No material termination for default or show cause notice is, or
     since January 1, 1994 has been, in effect pertaining to any Government
     Contract.

          (iv) Since January 1, 1994, there has been no known governmental
     investigation (other than routine investigations and audit proceedings) of
     UDLP or any of its Subsidiaries regarding an alleged or potential material
     violation of law by UDLP or any of its Subsidiaries with respect to any
     Government Contract.

          (v) Neither UDLP nor any of its Subsidiaries has since January 1, 1994
     in connection with the Business, conducted any material internal
     investigation in connection with which UDLP has engaged outside legal
     counsel or independent accountants, or made any material voluntary
     disclosure to the U.S. government pursuant to the Voluntary

                                      -24-
<PAGE>
 
     Disclosure Program of the U.S. government, outside the ordinary course as a
     result of any material suspected irregularity with respect to any
     Government Contract.

          (vi) To the knowledge of Sellers, the cost accounting and procurement
     systems maintained by UDLP and its Subsidiaries in connection with the
     conduct of the Business with respect to Government Contracts are in
     compliance with all applicable material U.S. government laws and
     regulations (including all applicable cost accounting standards) in all
     material respects.

          (vii) With respect to each Government Contract to which UDLP or any of
     its Subsidiaries is a party (A) to the knowledge of Sellers, since January
     1, 1997, UDLP and each of its Subsidiaries have complied with the material
     terms and conditions of each Government Contract which is a Material
     Contract except for such instances of non-compliance as will not result in
     a termination of the Material Contract or material liability and (B) to the
     knowledge of Sellers, all material representations and certifications
     executed, acknowledged or set forth in each Government Contract were
     complete and correct in all material respects as of their effective date.
     For the purpose hereof, "Government Contract" means any contract between
     the United States government (or a department or agency thereof) or any
     prime contractor to the United States Government and UDLP, any of its
     Subsidiaries or either Seller.

          (r) Labor Relations. Except as set forth on Schedule 4C(r), neither
UDLP nor any of its Subsidiaries has engaged in any unfair labor practice that
would have a Material Adverse Effect and there are no material complaints
against UDLP or any of its Subsidiaries pending or, to the knowledge of Sellers,
threatened before the National Labor Relations Board or any similar state or
local labor agency. Except as disclosed on Schedule 4C(r), there are no
representation questions, labor strikes, slow downs or stoppages, grievances or
other labor disputes pending or, to the knowledge of Sellers, threatened with
respect to the employees of UDLP or any of its Subsidiaries that would have a
Material Adverse Effect, and neither UDLP nor any of its Subsidiaries (nor
either Seller in connection with the conduct of the Business) has since January
1, 1994 experienced any such representation question, labor strike, slow down,
stoppage or other labor dispute.

          (s) Licenses, Permits and Authorizations. To the knowledge of Sellers,
UDLP or a Subsidiary has all of the licenses, approvals, consents, franchises
and permits necessary to permit UDLP and its Subsidiaries to conduct the
Business as currently conducted, except as would not have a Material Adverse
Effect.

          (t) Assets. The assets reflected on the June 30 Balance Sheet,
together with all rights of UDLP, its Subsidiaries and Foreign Affiliates under
contracts and the assets of the Foreign Affiliates and such assets as are
transferred to UDLP pursuant to Section 5(g) are all of the material assets used
in the Business.

          (u) Loss Contracts; Backlog. Set forth on Schedule 4C(u)-1 are those
Material Contracts with respect to which UDLP has accrued a loss on the June 30
Balance Sheet. Set forth

                                      -25-
<PAGE>
 
on Schedule 4C(u)-2 are (i) a list of the Backlog with respect to contracts for
the sale of goods or services to unaffiliated third parties where there is an
official award reported for UDLP, broken out by division on FMC's internal
financial reporting systems as of July 31, 1997, which totals approximately $1.4
billion and (ii) a list of selected contracts and their respective approximate
Backlog (subject to change based on deliveries and customer-directed contract
modification and authorization changes) for GSD, ASD and DSI. For purposes of
this Agreement, the term "Backlog" means as of any given date, (i) the total
amount awarded and funded under the applicable contract as of such date less
(ii) the amount of the shipments made in respect of such contract as of such
date.

          (v) Customers, Distributors and Suppliers. Schedule 4C(v) sets forth a
list of the names of the (i) ten (10) largest customers of each division of the
Business (or such fewer number as provide a substantial majority of the revenue
of such division) for the most recent fiscal year, showing the approximate total
sales in dollars by the Business to each such customer during such fiscal year;
and (ii) the ten (10) largest suppliers of each division of the Business (or
such fewer number as supply a substantial majority of the purchases by dollar
volume of such division) for the most recent fiscal year showing the approximate
total purchases in dollars by the Business from each such supplier during such
fiscal year. Neither UDLP nor any of its Subsidiaries has received any
communication in writing from any customer or supplier named on Schedule 4(C)(v)
of any intention to terminate or materially reduce purchases from or supplies to
the Business, which termination or reduction would have a Material Adverse
Effect.

          (w) Dividends by Foreign Affiliates. Schedule 4C(w) sets forth the
aggregate amount of dividends paid to UDLP or the Sellers by each Foreign
Affiliate in each of the preceding five (5) fiscal years and the aggregate
amount of dividends paid by such Foreign Affiliates to UDLP since December 31,
1996.

          5. Covenants of Sellers. Sellers jointly and severally covenant and
agree as follows:

          (a) Access. Prior to the Closing, Sellers shall grant to Buyer or
cause to be granted to Buyer and its representatives, employees, counsel and
accountants reasonable access, during normal business hours and upon reasonable
notice, to the personnel, properties, books and records of UDLP and its
Subsidiaries and Foreign Affiliates, and Sellers shall not object to Buyer's
communicating in a reasonable manner with key customers and suppliers on
matters, relating to the Business; provided, however, that such access does not
unreasonably interfere with the normal operations of UDLP and that Sellers'
approval is required with respect to access to, and communications with
customers and suppliers of, the Foreign Affiliates; provided further, that all
requests for access shall be directed to Randall S. Ellis, or such other person
as Sellers may designate from time to time; and provided further, that Buyer
shall have obtained any and all necessary governmental or administrative
security clearances and approvals. Buyer shall indemnify and hold Sellers, UDLP
and their respective Affiliates, officers, shareholders, directors and employees
harmless against any and all losses, liabilities, expenses and damages or
actions or claims with respect thereto resulting from claims suffered or
incurred by any of such persons or entities arising out of or with respect to
Buyer's or its representatives', agents' or employees' exercise of Buyer's

                                      -26-
<PAGE>
 
rights under this Section 5(a) to the extent arising from the negligence or
willful misconduct of Buyer or its representatives, employees, counsel and
accountants.  Notwithstanding any provision in this Agreement to the contrary,
Buyer's obligations under this Section 5(a) shall survive the termination of
this Agreement and the consummation of the transactions contemplated hereby.

          (b) Ordinary Conduct. Except as permitted by the terms of this
Agreement or as set forth in Schedule 5(b) or the other Schedules hereto, from
the date hereof to the Closing, Sellers will cause UDLP and its Subsidiaries
and, subject to existing obligations under any applicable agreement with the
minority partners, Foreign Affiliates to conduct the Business in the ordinary
course, consistent with past practices. Except as provided in this Agreement or
Schedule 5(b) or the other Schedules hereto, from the date hereof until the
Closing, Sellers shall not permit UDLP or any of its Subsidiaries or, subject to
existing obligations under any applicable agreement with minority partners,
Foreign Affiliates to do any of the following without the prior written consent
of Buyer:

               (i) in the case of UDLP, amend its Certificate of Limited
     Partnership or its Agreement of Limited Partnership in any manner which
     would be materially adverse to Buyer and, in the case of any Subsidiary or
     Foreign Affiliates of UDLP, amend its corporate charter, bylaws or other
     organizational documents in any manner which would be materially adverse to
     Buyer;

               (ii) make any material change in the conduct of the Business,
     except as contemplated or permitted by this Agreement;

               (iii) sell, lease, license or otherwise dispose of, or agree to
     sell, lease, license or otherwise dispose of, any interest in any material
     assets of UDLP or any Subsidiary or Foreign Affiliates, except for sales in
     the ordinary course of business;

               (iv) permit, allow or subject any of the material assets owned by
     UDLP or any Subsidiary or Foreign Affiliates to any mortgage, pledge,
     security interest, encumbrance or lien or suffer such to be imposed, except
     for Permitted Liens;

               (v) except in the ordinary course of business or as required by
     law or contractual obligations or other agreements existing on the date
     hereof, increase in any manner the compensation of, or enter into any new
     bonus or incentive agreement or arrangement with, any officers or other key
     personnel;

               (vi) assume, incur or guarantee any obligation for borrowed money
     (other than intercompany indebtedness) having an outstanding principal
     amount in excess of $1,000,000 in the aggregate;

               (vii) enter into a material lease of real property other than in
     the ordinary course of business, except that Buyer acknowledges and
     consents to UDLP entering into any lease the negotiation of which has
     commenced prior to the date of this Agreement or any renewal of a lease to
     which UDLP is a party;

                                      -27-
<PAGE>
 
               (viii) directly or indirectly, make any distribution of assets
     (other than cash distributions or other cash payments by UDLP or its
     Subsidiaries in the ordinary course) to its equity holders, or directly or
     indirectly, purchase, redeem, issue, sell or otherwise acquire or dispose
     of any equity interest of UDLP or such Subsidiary or Foreign Affiliate or
     cause any Foreign Affiliate to accelerate the payment of any dividends;

               (ix) issue any equity interests or other securities (other than
     debt securities permitted pursuant to the foregoing clause (vi)) or any
     options, warrants or other rights exercisable for such equity interests or
     other securities or otherwise take (or agree or plan to take) any steps
     affecting or changing the capitalization of UDLP or any its Subsidiaries or
     Foreign Affiliates,

               (x) change its accounting methods, principles or policies in any
     material respect;

               (xi) make any material Income Tax election that could affect
     Buyer, UDLP or its Subsidiaries after the Closing or apply to change any
     method of accounting for Tax purposes in any material respect;

               (xii) acquire or agree to acquire by merging or consolidating
     with, or acquiring by purchasing a substantial portion of the assets of, or
     in any other manner, any business or any corporation, partnership,
     association or other business organization or division thereof or acquire
     or agree to acquire any material assets or property, except in the ordinary
     course of business and in a manner consistent with past practice;

               (xiii) amend in any materially adverse respect any Material
     Contract; or

               (xiv) enter into any legally binding commitment to do any of 
     the foregoing

provided, however, that nothing in this Section 5(b) shall be construed to
prohibit, prevent or otherwise limit Sellers from settling accounts through, or
otherwise making, regular, tax or other special distributions in cash or
repayments of cash from UDLP to any Seller, to the extent that, unless otherwise
provided in this Agreement (including in Section 2(b)), any such distribution or
repayment is reflected on the Closing Statement; and provided further that,
except as set forth in Section 8(p), nothing in this Agreement shall require the
presence of any positive cash balance on the books or in the accounts of UDLP at
the Closing.

          (c) Confidentiality. Each Seller agrees that, after the Closing Date,
it shall, and shall use its reasonable efforts to cause its respective
directors, officers, employees, advisors and Affiliates to, keep the 
Information (as defined below) confidential for a period of five years from the
Closing Date, except that any Information required by law or legal or
administrative process to be disclosed may be disclosed without violating the
provisions of this Section 5(c), and except that any Information may be used and
disclosed (i) in connection with the exercise or performance by Sellers of their
respective rights and obligations under or as permitted by the Ancillary
Agreements and (ii)

                                      -28-
<PAGE>
 
(subject to reasonable and customary confidentiality protections, and without
jeopardizing the protection of trade secrets) in connection with the
development, manufacture, sale or distribution of any product outside of UDLP's
Scope of Activity, in each case without violating the provisions of this Section
5(c); provided, however, that, with respect to Information that consists of
technical information, trade secrets or know-how, the covenants and obligations
of the Sellers in this Section 5(c) shall not terminate so long as such
technical information, trade secrets or know-how is or remains Information
subject to this Section 5(c). At Buyer's request, each Seller shall use legal
action, including the commencement of litigation, if required, to enforce such
confidentiality obligations, and Buyer shall reimburse each such Seller for
reasonable out-of-pocket expenses (including the fees and expenses of counsel)
incurred in connection with such legal action as is requested by Buyer. For
purposes hereof, the term "Information" means all information that relates to
UDLP, the Subsidiaries or the Foreign Affiliates or the Business, other than any
such information that is available to the public on the Closing Date, or
thereafter becomes available to the public other than as a result of a breach of
this Section 5(c), or is developed independently by Sellers or their respective
Affiliates after the Closing or is obtained from third parties who have no duty
of confidentiality to Buyer, UDLP or any of its Subsidiaries or Foreign
Affiliates.

          (d) Preservation of Business. Prior to the Closing, subject to the
terms and conditions of this Agreement, Sellers shall, and shall cause UDLP and
its Subsidiaries and, subject to applicable agreements with the minority
partners, Foreign Affiliates to, use reasonable best efforts consistent with
past practices to preserve the Business intact, to preserve the goodwill of
customers and suppliers of UDLP and to retain its key employees.

          (e) Covenant Not to Compete. Each Seller agrees that, for a period of
six years following the Closing Date, it will not, and will cause each of its
Affiliates not to, engage, directly or indirectly, anywhere in the world in any
line of business within the Scope of Activity; provided, however, that (i)
Harsco shall be entitled to continue to engage in the development, manufacture,
retrofit, installation, repair, overhaul, engineer, design, service, sale and
marketing of armor and armor kits for sale to the military and other customers,
(ii) Harsco shall be entitled to engage in activities reasonably necessary to
completing the termination and winding up of its former truck and bus business
and (iii) either Seller shall be entitled to engage in the development,
manufacture, retrofit, installation, repair, overhaul, engineer, design,
service, sale and marketing of any component part or subsystem of military
vehicle systems which are substantially the same as classes of products or
services that primarily are commercially sold by such Seller for non-military
uses. If any court of competent jurisdiction shall finally hold that the time,
territory or any other provision set forth in this Section 5(e) constitutes an
unreasonable restriction, such provision shall not be rendered void, but shall
apply as to such time, territory or to such other extent as such court may
determine constitutes a reasonable restriction under the circumstances involved.
Each Seller acknowledges that the restrictions contained in this Section 5(e)
are reasonable and necessary to protect the legitimate interests of Sellers,
UDLP and Buyer and that any breach by either Seller of any provision hereof will
result in irreparable injury to UDLP and Buyer. Each Seller acknowledges that,
in addition to all remedies available at law, UDLP and Buyer shall be entitled
to equitable relief, including injunctive relief, and an equitable accounting of
all losses and damages. For purposes of this Agreement, the "Scope of Activity"
of UDLP shall be to engage in the development, manufacture, retrofit,

                                      -29-
<PAGE>
 
installation, overhaul, repair, engineering, design, service, sale and marketing
of any military vehicle system or weapon system or station or component thereof.
It shall not be a violation of this provision for either Seller to purchase or
combine with an entity conducting a business that has products and services that
fall within the Scope of Activity but are incidental to the business of such
entity as a whole.  Each Seller further agrees that it will not, for a period
commencing on the date hereof and ending two years following the Closing Date,
knowingly solicit the employment of or hire the employees of UDLP listed on
Schedule 5(e).

          (f) Cooperation.  For a period of 90 days after the Closing, Sellers 
shall cooperate with Buyer and shall cause its respective officers, employees,
agents and representatives to cooperate with Buyer to the extent reasonably
requested by Buyer to provide for an orderly transition of the Business to
Buyer. Buyer shall reimburse each Seller for the out-of-pocket costs and
expenses incurred by such Seller in assisting Buyer pursuant to this Section
5(f). Notwithstanding the foregoing, neither Seller shall be required by this
Section 5(f) to take any action that would unreasonably interfere with the
conduct of its business or the Business.

          (g) FMC Resource Transfer.  On the Closing Date, FMC shall transfer to
UDLP all of FMC's right, title and interest in and to certain enumerated assets
of FMC's Corporate Technology Center in the manner, and subject to the terms and
conditions, set forth on Schedule 5(g) attached hereto.

          (h) Intercompany Obligations.  All outstanding intercompany 
obligations between each Seller and UDLP or any of the Subsidiaries shall be
settled and terminated at or prior to Closing, other than obligations that
reflect amounts owed for actual services performed or goods delivered in the
ordinary course.

          (i) Financing Obligations.  At or prior to the Closing, Sellers shall
cause all outstanding Financing Obligations (other than Financing Obligations
relating to letters of credit and related reimbursement agreements listed on
Schedule 7(e) which are not replaced as provided in Section 7(e) (the
"Continuing LC Obligations")) to be finally repaid in full, terminated or
reflected in the computation of the Adjusted Net Worth Amount on the Closing
Statement.

          (j) Notification of Certain Matters.  From the date hereof through the
Closing, Sellers shall give prompt written notice to Buyer, and Buyer shall give
prompt written notice to Sellers, of (i) the occurrence, or failure to occur, of
any event which occurrence or failure would be likely to cause any of Sellers'
or Buyer's respective representations or warranties contained in this Agreement
to be untrue or inaccurate in any material respect and (ii) any material failure
of Sellers or Buyer to comply with or satisfy any of its respective covenants,
conditions or agreements to be complied with or satisfied by it under this
Agreement; provided, however, that such disclosure shall not be deemed to cure
any breach of a representation, warranty, covenant or agreement or to satisfy
any condition.

          (k) FMC Arabia.  The parties acknowledge that UDLP is the beneficial 
owner of limited liability company interests in FMC Arabia Limited, a limited
liability company organized

                                      -30-
<PAGE>
 
under the laws of the Kingdom of Saudi Arabia ("FMC Arabia"), entitling UDLP to
51% of the capital and profits of FMC Arabia (the "FMC Arabia Interests") but
that FMC is the record owner of the FMC Arabia Interests. For administrative
convenience, the parties desire that FMC retain record ownership of the FMC
Arabia Interests until such time as Buyer provides FMC with written notice (a
"Transfer Notice") instructing FMC to transfer record ownership of the FMC
Arabia Interests to UDLP, but that UDLP continue to be provided all benefits of
ownership of the FMC Arabia Interests. Following receipt of a Transfer Notice,
FMC shall take any and all commercially reasonable actions necessary to cause
record ownership of the FMC Arabia Interests to be transferred to UDLP, free and
clear of all Liens (including, without limitation, obtaining all requisite
governmental and third party consents and/or approvals), as soon as practical
following receipt of the Transfer Notice and in any event within sixty (60) days
after receipt of such Transfer Notice, at the cost and expense of FMC. From and
after the Closing, (i) FMC shall promptly remit and pay over to UDLP any and all
dividends, distributions and other payments received by FMC in respect of the
FMC Arabia Interests and (ii) FMC shall take all actions reasonably requested by
UDLP in respect of the FMC Arabia Interests, including, without limitation,
granting to UDLP proxies or powers of attorney in respect of the FMC Arabia
Interests or voting the FMC Arabia Interests as directed by UDLP. FMC
acknowledges and agrees that Buyer and UDLP shall be entitled to specific
performance of FMC's obligations under this Section 5(k). Buyer shall indemnify
FMC against any liability or expense it reasonably incurs as a result of taking
any actions requested by UDLP under this Section other than the cost and expense
of causing such ownership to be transferred to UDLP.

          6.  Representations and Warranties of Buyer.  Buyer hereby represents
and warrants to Sellers as follows:

          (a) Authority; No Conflicts.

               (i) Buyer is a corporation duly organized, validly existing and
     in good standing under the laws of the State of Delaware. Buyer has all
     requisite corporate power and authority to enter into this Agreement and
     the Ancillary Agreements to which it is a party and to consummate the
     transactions contemplated hereby and thereby. All corporate acts and other
     proceedings required to be taken by Buyer to authorize the execution,
     delivery and performance of this Agreement and the Ancillary Agreements to
     which it is a party and the consummation of the transactions contemplated
     hereby and thereby have been duly and properly taken. This Agreement has
     been duly executed and delivered by Buyer, and the Ancillary Agreements to
     be executed and delivered by Buyer will be duly and validly executed and
     delivered by Buyer. This Agreement and the Ancillary Agreements to which
     Buyer is a party constitute, or will constitute, as the case may be, valid
     and binding obligations of Buyer, enforceable against Buyer in accordance
     with their terms.

               (ii) The execution and delivery by Buyer of this Agreement and
     the Ancillary Agreements to which it is a party do not, and the
     consummation by Buyer of the transactions contemplated hereby and thereby
     and compliance by Buyer with the terms hereof and thereof will not,
     conflict with, or result in any violation of or default under, or give rise
     to a right of termination, cancellation or acceleration of any obligation
     or to loss of a benefit under, or

                                      -31-
<PAGE>
 
     result in the creation of any lien, claim, encumbrance, security interest,
     option, charge or restriction of any kind upon any of the properties or
     assets of Buyer under, or require any consent, authorization or approval
     under any provision of (A) the certificate of incorporation or by-laws of
     Buyer, (B) any material contract to which Buyer is a party, or (C) any
     material judgment, order or decree, or any material statute, law,
     ordinance, rule or regulation applicable to Buyer or its property or
     assets, other than any such conflicts, violations, defaults, rights or
     liens, claims, encumbrances, security interests, options, charges or
     restrictions that, individually or in the aggregate, would not prevent
     Buyer from consummating the transactions contemplated hereby, except for
     any such consents, authorizations or approvals required under the HSR Act
     or that may be required solely by reason of a Seller's status or a Seller's
     participation in the transactions contemplated hereby.

          (b) Actions and Proceedings, etc.  There are no (i) outstanding 
judgments, orders, writs, injunctions or decrees of any court, governmental
agency or arbitration tribunal against Buyer which have or could have a material
adverse effect on the ability of Buyer to consummate the transactions
contemplated hereby or (ii) actions, suits, claims or legal, administrative or
arbitration proceedings or investigations pending or, to the knowledge of Buyer,
threatened against Buyer, which have or could have a material adverse effect on
the ability of Buyer to consummate the transactions contemplated hereby.

          (c) Availability of Funds.  Buyer has irrevocable commitments, as
described in the Equity Letter issued on the date hereof by The Carlyle Group
and requiring the contribution of capital to Buyer in the amount of
$175,000,000, the Commitment Letter issued on the date hereof to TC Group,
L.L.C. by Bankers Trust Corporation and the Commitment and Engagement Letter
issued on the date hereof to TC Group, L.L.C. by Lehman Brothers, Inc., each of
which is attached hereto as Schedule 6(c), to enable it to consummate the
transactions contemplated by this Agreement.  Buyer has no reason to believe
that it will not have cash available at the Closing pursuant to such commitments
necessary to consummate the transactions contemplated by this Agreement.  Buyer
has deposited $10,000,000 of the Initial Purchase Price with the escrow agent
pursuant to the terms of the Escrow Agreement attached hereto as Exhibit 6(c).

          (d) Acquisition of Interests for Investment.  All securities 
purchased, directly or indirectly, by Buyer pursuant to this Agreement are being
acquired for investment only and not with a view to any public distribution
thereof, and Buyer will not offer to sell or otherwise dispose of such
securities so acquired by it in violation of any of the registration
requirements of the Securities Act of 1933, as amended, or any comparable state
law.

          (e) Fulfillment of Condition.  Buyer has no knowledge of any state of
facts or conditions which would prevent or otherwise hinder, in any material
respect, fulfillment of the condition to Closing specified in Section 3(b)(iii).

          7.  Covenants of Buyer.  Buyer covenants as follows:

          (a) Confidentiality of Buyer.

                                      -32-
<PAGE>
 
               (i)  Buyer acknowledges that all information provided to any of
     it and its Affiliates, agents and representatives by any of FMC, UDLP and
     their respective Affiliates, agents and representatives is subject to the
     terms of a confidentiality agreement between or on behalf of FMC, UDLP and
     Buyer or one or more of their respective Affiliates or other beneficial
     owners (the "Diligence Confidentiality Agreement"), the terms of which are
     hereby incorporated herein by reference. Effective upon, and only upon, the
     Closing, the Diligence Confidentiality Agreement shall terminate.

               (ii) Buyer agrees that, after the Closing Date, Buyer and UDLP
     shall use their respective reasonable efforts to, and shall use their
     respective reasonable efforts to cause their respective directors,
     officers, employees, former employees, advisors and Affiliates to, keep
     Seller Information (as defined below) confidential for a period of five
     years from the Closing Date; provided, however, that with respect to Seller
     Information that consists of technical information, trade secrets or know-
     how, the covenants and obligations of Buyer and UDLP in this Section
     7(a)(ii) shall not terminate so long as such technical information, trade
     secrets or know-how is or remains Information subject to this Section 7(a);
     and provided further that any Seller Information required by law or legal
     or administrative process to be disclosed may be disclosed without
     violating the provisions of this Section 7(a)(ii). At any Seller's request,
     Buyer shall, or shall cause UDLP to, use legal action, including the
     commencement of litigation, if required, to enforce such confidentiality
     obligations, and such Seller shall reimburse Buyer for reasonable out-of-
     pocket expenses (including the fees and expenses of counsel) incurred in
     connection with such legal action as is requested by such Seller. For
     purposes of this Agreement, the term "Seller Information" shall mean all
     information concerning Sellers or their Affiliates, including any financial
     information, trade secrets, know-how and other confidential technical and
     business information, other than information that relates to the Business,
     UDLP, the Subsidiaries or the Foreign Affiliates and other than any such
     information that is available to the public on the Closing Date, or
     thereafter becomes available to the public other than as a result of a
     breach of this Section 7(a)(ii).

          (b)  Performance of Obligations by Buyer After Closing Date. Subject
to Section 8(f), Section 8(h)(xiii), Section 10 and Section 11(a), following the
Closing Date, Buyer shall or shall cause UDLP to duly, promptly and faithfully
pay, perform and discharge when due, (i) all obligations and liabilities of
whatever kind and nature, primary or secondary, direct or indirect, absolute or
contingent, known or unknown, whether or not accrued, whether arising before, on
or after the Closing Date, of UDLP, other than the Retained Liabilities, without
limitation, any such obligations or liabilities contained in any contract or
other agreement and (ii) any liability or obligation of any Seller and its
respective Affiliates with respect to any of the liabilities described in clause
(i), including, without limitation, any guarantee or obligation to assure
performance given or made by one or more of Sellers and their respective
Affiliates with respect to any such obligation of any of UDLP, the Subsidiaries
and the Foreign Affiliates.

          (c)  No Additional Representations; Disclaimer Regarding Estimates and
Projections. Buyer acknowledges that neither Seller, nor any other person or
entity acting on behalf

                                     -33-
<PAGE>
 
of a Seller or any Affiliate of a Seller, (i) has made any representation or
warranty express or implied, including any implied representation or warranty as
to the condition, merchantability, suitability or fitness for a particular
purpose of any of the assets used in the Business or held by UDLP or (ii) has
made any representation or warranty, express or implied, as to the accuracy or
completeness of any information regarding the Business, UDLP or any Affiliate of
UDLP, in each case except as expressly set forth in this Agreement and the
Ancillary Agreements or as and to the extent required by this Agreement to be
set forth in the Schedules hereto. Buyer further agrees that neither Seller nor
any other person or entity will have or be subject to any liability, except as
specifically set forth in this Agreement, to Buyer or any other person resulting
from the distribution to Buyer, or Buyer's use of, any such information,
including the Confidential Offering Memorandum distributed by Morgan Stanley &
Co. Incorporated and any information, document, or material made available to
Buyer in certain "data rooms," management presentations or any other form in
expectation of the transactions contemplated by this Agreement.

          In connection with Buyer's investigation of UDLP, Buyer has received
certain projections, including projected statements of operating revenues and
income from operations of the Business and UDLP for the fiscal year ending on
December 31, 1997 and for subsequent fiscal years and certain business plan
information for such fiscal year and succeeding fiscal years. Buyer acknowledges
that there are uncertainties inherent in attempting to make such estimates,
projections and other forecasts and plans, that Buyer is familiar with such
uncertainties and that Buyer is taking full responsibility for making its own
evaluation of the adequacy and accuracy of all estimates, projections and other
forecasts and plans so furnished to it (including the reasonableness of the
assumptions underlying such estimates, projections and forecasts). Accordingly,
neither Seller makes any representation or warranty with respect to such
estimates, projections and other forecasts and plans (including the
reasonableness of the assumptions underlying such estimates, projections and
forecasts).

          (d)  Intentionally omitted.

          (e)  Certain Guaranties. Sellers and Buyers shall cooperate and use
their respective reasonable best efforts to cause each of the performance bonds,
letters of credit and/or guaranties or other obligations set forth on Schedule
7(e) (each a "Seller Guaranty") to be replaced with performance bonds and/or
letters of credit issued for the account of Buyer. Copies of each of the Seller
Guaranties have been provided to Buyer. If any Seller Guaranty has not been so
replaced as of the Closing (any such Seller Guaranty which is not so replaced
being referred to as "Continuing Guaranty"), Buyer will obtain a letter of
credit in favor of the applicable Seller with a face of amount and expiration
date identical to that set forth in the applicable Continuing Guaranty (the
letters of credit obtained by Buyer in respect of such Continuing Guaranties
being referred to herein as the "Substitute Letters of Credit"). Each Substitute
Letter of Credit shall permit the beneficiary to draw on such Substitute Letter
of Credit only to the extent of any drawing on the Continuing Guaranty to which
such Substitute Letter of Credit relates and shall otherwise be on substantially
the same terms as the Continuing Guaranties set forth on Schedule 7(e) and in
form and substance reasonably satisfactory to Buyer and Sellers. Following the
Closing, Buyer shall also indemnify each Seller for any amounts actually paid by
such Seller in respect of the guarantee obligations set forth on Schedule

                                     -34-
<PAGE>
 
7(e), together with interest thereon at a rate of 8% per annum
from the date on which such Seller makes such payment to the date of
reimbursement by Buyer to the extent that drawings under a Substitute Letter of
Credit are not available to reimburse Sellers for the amounts so paid.

          (f)  Retained Assets and Liabilities.

               (i)  Litigation. With respect to all litigation matters that are
     designated as retained assets or retained liabilities on Schedule 7(f)
     hereto or which may arise after the execution of this Agreement or the
     Closing, upon the reasonable request of either Seller, Buyer shall promptly
     assist such Seller in the prosecution or defense of any claim, threatened
     claim, audit, investigation or proceeding by or against any governmental
     entity or any other third party (each an "Activity"). Buyer shall cooperate
     promptly with the applicable Seller in such Seller's efforts to investigate
     in a privileged manner, conduct or resolve any such Activity as may be
     deemed necessary or useful in such Seller's sole but reasonable discretion;
     provided, however, that (A) such assistance does not unreasonably disrupt
     the conduct of Buyer's operations and (B) such Seller shall reimburse Buyer
     for all out-of-pocket expenses reasonably incurred by Buyer in connection
     therewith. Such assistance shall be provided by the employee or employees
     of Buyer or UDLP best qualified to provide the requested assistance
     expeditiously, as determined by Buyer in its reasonable discretion. Such
     assistance shall include, without limitation, to the extent reasonably
     practicable, extracting from the files and records of Buyer or UDLP all
     information relevant to the Activity, consultation concerning such
     Activity, testimony, if necessary, in any proceeding relating to such
     Activity, and assistance with the preparation of any pleadings or other
     submissions with respect to such Activity. Such assistance shall also
     require Buyer to grant Harsco sole possession, custody, control and access
     to all documents currently under Harsco's custody and control which are
     contained within the secure areas in the west warehouse and the farmhouse
     of UDLP's York, Pennsylvania plant as of the Closing Date. Harsco shall
     provide copies to Buyer, at Buyer's reasonable request, of documents in
     Harsco's custody and control relating to the Business. Buyer also shall
     provide Harsco access to the above secure areas currently used by Seller to
     store and review said documents and conduct interviews. Upon the conclusion
     of any Activity pertaining to the documents contained in the secured areas
     described above, possession, custody and control over said documents shall
     be relinquished by Harsco to Buyer. The parties hereto agree that
     notwithstanding the foregoing, nothing in this Section 7(f)(i) will in any
     way limit or otherwise affect any obligation of Buyer arising under this
     Agreement or the transactions contemplated hereby.

               (ii)  Contract Close-outs. With respect to all contracts that are
     designated as retained assets or retained liabilities on Schedule 7(f)
     hereto, as to which the applicable Seller will retain all financial
     liability, if any, Buyer and UDLP will be responsible, from and after the
     Closing, for the administration of the close-out or settlement of such
     contracts. Without limiting the generality of the foregoing, Buyer will
     cooperate as reasonably requested with the applicable Seller in the effort
     to close-out or settle each such contract, including by consulting with
     such Seller on a regular and frequent basis and providing such Seller with
     such information as is requested in such Seller's sole but reasonable
     discretion;

                                     -35-
<PAGE>
 
     provided, however, that such cooperation and consultation does not
     unreasonably disrupt or interfere with the business of UDLP or Buyer. Such
     Seller shall reimburse Buyer for all out-of-pocket expenses reasonably
     incurred by Buyer in connection therewith. In addition, the parties hereto
     agree that neither Buyer nor any Affiliate of Buyer may close-out or settle
     any such contract (or resolve any open issues with respect thereto) without
     the prior written consent of the applicable Seller, which will not be
     unreasonably withheld or delayed.

          (g)  1997 Audited Financial Statements. Buyer shall prepare and
deliver to each Seller at Buyer's sole cost and expense, as promptly as
practicable but in no event later than 90 days after the end of UDLP's 1997
fiscal year, a balance sheet of UDLP as of the end of such fiscal year and the
related statements of operations, changes in partners' equity and cash flow of
UDLP for such fiscal year, together with appropriate notes to such financial
statements, and a balance sheet as of the end of such prior fiscal years and
related statements for such number of additional fiscal years as may be
reasonably requested by either Seller in order for such Seller to comply with
Regulation S-X, 17 C.F.R. (S)210.3-09 et seq. These statements shall reflect all
of UDLP's expenses and contingent liabilities as if UDLP were a stand-alone
entity consistent with U.S. generally accepted accounting principles. These
financial statements shall also comply with the other relevant provisions of
Regulation S-X, 17 C.F.R. (S)210, and shall be audited and reported on by a "big
six" accounting firm selected by Buyer.

          8.   Mutual Covenants. Sellers and Buyer covenant and agree as
follows:

          (a)  Consents. Buyer acknowledges that certain consents to the
transactions contemplated by this Agreement or the Ancillary Agreements may be
required from parties to contracts, leases, licenses or other agreements
(written or otherwise) to which any of Sellers and UDLP or any of their
respective Affiliates is a party (a "Required Consent") and such consents may
not be obtained prior to the Closing. Sellers shall cooperate with Buyer in any
reasonable manner and take such reasonable actions as Buyer may request in
connection with Buyer's obtaining any such consents; provided, however, that
such cooperation shall not include any requirement of Sellers to expend money,
commence any litigation or offer or grant any accommodation (financial or
otherwise) to any third party. In the event that such consents are not obtained,
Sellers shall take such additional actions as reasonably requested by Buyer to
provide to Buyer the economic benefits of such contracts, leases, licenses or
other agreements, including without limitation by subcontracting, sublicensing
or other similar arrangements, provided that Buyer performs and discharges its
obligations under such contracts, leases, licenses or agreements.

          (b)  Publicity. Each Seller and Buyer agree that, from the date hereof
through the Closing Date, no public release or announcement concerning the
transactions contemplated hereby shall be issued or made by Buyer without the
prior consent of Sellers (which consent shall not be unreasonably withheld) and
no public release or announcement concerning the transactions contemplated
hereby shall be issued or made by any Seller without the prior consent of Buyer
(which consent shall not be unreasonably withheld), except (i) as such release
or announcement may be advisable or required by law or the rules or regulations
of any United States or foreign securities exchange on which such party's
securities are listed, in which case the party required to make the

                                     -36-
<PAGE>
 
release or announcement shall allow the other party reasonable time to comment
on such release or announcement in advance of such issuance and (ii) that each
of Sellers and UDLP may make such an announcement to their respective employees.
Notwithstanding the foregoing, Buyer and each Seller shall cooperate to prepare
press releases to be issued at the time of the signing of this Agreement and on
the Closing Date. Each Seller and Buyer agree to keep the terms of this
Agreement confidential, except to the extent required by applicable law or for
financial reporting purposes and except that the parties may disclose such terms
to their respective accountants and other representatives as necessary in
connection with the ordinary conduct of their respective businesses (so long as
such persons agree to keep the terms of this Agreement confidential).

          (c)  Best Efforts. Subject to the terms of this Agreement (including
the limitations set forth in Section 8(a)), each party will use its reasonable
best efforts to cause the Closing to occur.

          (d)  HSR Act Compliance. Buyer and Sellers shall each file or cause to
be filed with the Federal Trade Commission and the United States Department of
Justice any notifications required to be filed under the HSR Act with respect to
the transactions contemplated hereby and each of Buyer and Sellers shall bear
the costs and expenses of their respective filings; provided, however, that
Buyer shall pay the filing fee in connection therewith. Each of Buyer and
Sellers shall use their respective best efforts to make such filings promptly
(and in any event within five business days) following the date hereof, to
respond to any requests for additional information made by either of such
agencies and to cause the waiting periods under the HSR Act to terminate or
expire at the earliest possible date and to resist in good faith, at each of
their respective cost and expense (including the institution or defense of legal
proceedings), any assertion that the transactions contemplated hereby constitute
a violation of the antitrust laws, all to the end of expediting consummation of
the transactions contemplated hereby. Each of Buyer, FMC and Harsco shall
consult with the other prior to any material submission to and any meetings, by
telephone or in person, with the staff of the Federal Trade Commission and the
United States Department of Justice, and each of Buyer, FMC and Harsco shall
have the right to review any such submission and have a representative present
at any such meeting.

          (e)  Cooperation with Financings. Sellers acknowledge that Buyer may
use the Financial Statements and other information regarding the Business, UDLP,
its Subsidiaries and the Foreign Affiliates in connection with financings
necessary to consummate the Closing, including in a Rule 144A offering
memorandum and a registration statement filed under the Securities Act of 1933,
as amended (the "Public Filings") to be issued or filed by Buyer. Sellers shall
(and shall cause UDLP and its Subsidiaries to) cooperate in a commercially
reasonable manner with Buyer prior to the Closing so that Buyer can obtain
information sufficient for Buyer to prepare a Rule 144A offering memorandum and
the Public Filings, in each case at Buyer's sole expense. The foregoing
cooperation of Seller shall include (i) compiling the requisite financial
information, including supplying financial information for purposes of comfort
letters to be issued in connection with Public Filings, (ii) granting Buyer or
UDLP's accountants, E&Y, full and complete access to the books and records of
UDLP and to any personnel knowledgeable about such books and records (including
UDLP's independent accountants), in each case, to the extent reasonably
requested by Buyer, (iii)

                                     -37-
<PAGE>
 
signing customary management representation letters related to the Financial
Statements and any comfort letters and (iv) using commercially reasonable
efforts to furnish necessary financial information for additional periods
subsequent to June 30, 1997 and prior to the Closing in connection with such
financings.

          (f)  Environmental Indemnification.

          (i) Non-San Jose/Santa Clara Properties. From and after the Closing,
     subject to clause (ii) below, Buyer shall be responsible for the costs of
     all environmental matters relating to the Business that are allowable costs
     under applicable government contracting statutes and regulations.

          (ii) San Jose/Santa Clara Properties. Subject to the remaining
     provisions of this Section 8(f), FMC will retain and will be responsible
     for 100% of all Remediation Costs after the Closing Date on the Sites
     covered by the Settlement and Advance Agreement, whether or not leased
     pursuant to the Lease. For a period of ten years following the Closing
     Date, FMC agrees that with respect to the Sites, it shall provide to Buyer
     no later than December 31 of each year commencing with the year 1997 a
     written report (a "Remediation Report") containing the following
     information prepared in good faith by or on behalf of FMC: (A) projected
     Remediation Costs for all of the Sites for each of the four years following
     such year (e.g., by December 31, 1997 FMC will provide projected
     Remediation Costs for the years 1998, 1999, 2000 and 2001) and (B)
     projected recoveries for the four years following such year (calculated
     with reference to the Settlement and Advance Agreement) from FMC Insurers
     attributable and allocable to the Sites. Attached hereto as Schedule
     8(f)(ii) are the Remediation Reports containing Remediation Costs and FMC
     Insurers recovery projections for years 1997, 1998 and 1999. Buyer agrees
     that it shall pay to FMC periodically, but in no event more frequently than
     quarterly, commencing September 30, 1997 and ending December 31, 2008 a
     portion of any such Remediation Costs incurred for any year during such
     period equal to (X) the amount of Remediation Costs incurred by FMC during
     such year less (Y) the amount of the recoveries from FMC Insurers for such
     year projected in the applicable Remediation Report multiplied by (Z) 0.78;
     provided, however, that (X) in no event shall the aggregate amount of such
     payments by Buyer exceed $16,700,000, (Y) the applicable Remediation Costs
     are incurred in accordance with the Advance Agreement and (Z) the total
     amount of Remediation Costs incurred during such year shall not exceed the
     projected Remediation Costs for such year set forth in the Remediation
     Report delivered twelve months prior to the commencement of such year.
     Buyer further agrees that it shall be responsible for performing, and shall
     perform, all of FMC's reporting obligations under the Settlement and
     Advance Agreement and that neither Buyer nor UDLP shall amend, modify or
     otherwise alter the Settlement in any manner materially disadvantageous to
     FMC and HUC without FMC's prior written consent, which consent shall not be
     unreasonably withheld. FMC agrees that it shall provide to Buyer as
     reasonably requested all information with respect to the Sites (whether
     relating to insurance, recoveries, Remediation Costs or otherwise) to the
     extent Buyer deems such information reasonably necessary or desirable in
     respect of Buyer's obligations under the Settlement and Advance Agreement.
     For purposes

                                     -38-
<PAGE>
 
     of this Agreement, the term "Settlement and Advance Agreement" shall mean
     the Settlement and Advance Agreement, dated as of December 15, 1995, by and
     among UDLP, FMC Corporation and the United States Department of Defense,
     represented by the Corporate Administrative Contracting Officer assigned to
     UDLP, and the terms "FMC Insurers", "Remediation Costs" and "Sites" shall
     have the meaning ascribed to such terms in the Settlement and Advance
     Agreement. Notwithstanding anything to the contrary contained in this
     Agreement or the Lease, Buyer agrees that, from and after the Closing Date,
     FMC shall have the sole right to initiate, control, direct and manage any
     investigative, corrective or remedial action on or with respect to any of
     the Sites. In connection with any such investigative, corrective or
     remedial actions to be taken after the Closing by FMC, Buyer and UDLP will
     cooperate with FMC as reasonably requested in providing access at
     reasonable times and under reasonable conditions to the Sites covered by
     the Lease (the "Leased Sites") for the employees, agents and equipment of
     FMC or its contractors and in permitting FMC to construct, maintain and
     operate on the Leased Sites, at no charge to FMC by Buyer or UDLP, such
     equipment and facilities (including without limitation pump and treat
     facilities) as are deemed necessary or desirable by FMC in order to effect
     such investigative, corrective or remedial actions. FMC shall cooperate
     with Buyer and UDLP as reasonably requested in taking all such actions in a
     manner designed to minimize to the extent reasonably practicable any
     disruption to the operations of the Business on the Leased Sites.
 
          (iii) Except for Remediation Costs which are the subject of Section
     8(f)(ii), Sellers and Buyer agree to the following allocation of
     responsibility for Environmental Losses which are not allowable costs under
     applicable government contracting statutes and regulations (the "Non-
     Allowable Costs"):
 
               (A) Buyer shall pay or cause UDLP to pay (or, if applicable,
          reimburse Sellers for the payment of) 25% of Non-Allowable Costs with
          respect to matters that are discovered by UDLP or Buyer and of which
          Sellers are notified in writing prior to the third anniversary of the
          Closing Date (the "Timely Non-Allowable Costs");
 
               (B) Sellers shall, subject to the provisions of Section 8(f)(vi),
          pay (or, if applicable, reimburse Buyer or UDLP for the payment of)
          75% of Timely Non-Allowable Costs; provided, however, that any
          obligation of Sellers to pay Timely Non-Allowable Costs that have not
          been previously incurred and for which Sellers have not received
          written notice by the tenth anniversary of the Closing Date shall
          terminate on such tenth anniversary; and
          
               (C) Buyer shall pay or cause UDLP to pay (or, if applicable,
          reimburse Sellers for the payment of) 100% of Non-Allowable Costs that
          are not Timely Non-Allowable Costs.

     For purposes of this Agreement, (1) the term "Environmental Losses" means
     all Losses (as defined in Section 11(a) hereto) incurred by Buyer or UDLP
     consistent with commercially reasonable environmental practices to the
     extent, and in the amount, arising from or relating

                                      -39-
<PAGE>
 
     to (i) the use, handling, storage, treatment, recycling, generation,
     transportation, release, spilling, leaking, pumping, pouring, emptying,
     discharging, injecting, escaping, leaching, disposal (on-site or off-site),
     dumping, or threatened release of Hazardous Materials on or prior to the
     Closing Date by UDLP or its Subsidiaries or their predecessors in interest,
     or by their agents, representatives, employees, or independent contractors
     when acting in such capacity on behalf of UDLP or its Subsidiaries; (ii)
     the exposure on or prior to the Closing of persons to Hazardous Materials
     in the work place at any current or former facility of the Business (a
     "Facility"); (iii) the exposure of persons or property as a result of
     Hazardous Materials released at or from any Facility on or prior to the
     Closing Date migrating from or otherwise emanating from any Facility; (iv)
     the off-site disposal of any Hazardous Materials that were generated at any
     Facility on or prior to the Closing Date; or (v) any pre-Closing violation
     of, or noncompliance with, any Environmental Requirement occurring with
     respect to the Business or any Facility on or prior to the Closing Date;
     provided, however, that Environmental Losses shall not include costs
     expended by Buyer or UDLP for remedial actions that are not reasonably
     necessary to comply with Environmental Requirements; and (2) the term
     "Hazardous Material" means any substance with respect to which liability or
     standards of conduct are imposed pursuant to an Environmental Requirement.

          (iv) Sellers, UDLP and Buyer acknowledge and agree that, from and
     after the Closing, their sole and exclusive remedy with respect to any and
     all claims relating to environmental matters relating to UDLP and the
     Business, including Non-Allowable Costs, shall be pursuant to the
     provisions of this Section 8(f). In furtherance of the foregoing, and
     except for matters which are the responsibility of Sellers pursuant to this
     Section 8(f), Sellers, UDLP and Buyer hereby waive, from and after the
     Closing, to the fullest extent permitted under applicable law, any and all
     rights, claims and causes of action each of them may have against one
     another with respect to environmental matters. Buyer and UDLP agree to
     assume on the Closing Date all Post-Closing Environmental Losses and
     further agree to indemnify and hold Sellers harmless from and against all
     Post-Closing Environmental Losses with respect to UDLP, its Affiliates and
     successors or the Business. The term "Post-Closing Environmental Losses"
     means all Losses (as defined in Section 11(a) hereto) incurred by Seller to
     the extent and in the amount arising from: (i) the use, handling, storage,
     treatment, recycling, generation, transportation, release, spilling,
     leaking, pumping, pouring, emptying, discharging, injecting, escaping,
     leaching, disposal (on-site or off-site), dumping, or threatened release of
     Hazardous Material after the Closing Date by Buyer, UDLP or its
     Subsidiaries or their successors in interest, or by their agents,
     representatives, employees, or independent contractors when acting in such
     capacity on behalf of Buyer, UDLP or its Subsidiaries or their successors
     in interest, or by their agents, representatives, employees, or independent
     contractors when acting in such capacity on behalf of Buyer, UDLP or its
     Subsidiaries; (ii) the exposure of persons to Hazardous Materials released
     after the Closing in the work place at any Facility owned or operated by
     Buyer, UDLP or its Subsidiaries; (iii) the exposures of persons or property
     as a result of Hazardous Materials released at or from any Facility owned
     or operated by Buyer, UDLP or its Subsidiaries after the Closing Date
     migrating from or otherwise emanating from any Facility owned or operated
     by Buyer, UDLP or its Subsidiaries; (iv) the off-site disposal of any
     Hazardous Materials that were

                                      -40-
<PAGE>
 
     generated at any Facility owned or operated by Buyer, UDLP or its
     Subsidiaries after the Closing Date; or (v) any violation of, or
     noncompliance with, any Environmental Requirement occurring with respect to
     the Business or any Facility owned or operated by Buyer, UDLP or its
     Subsidiaries after the Closing Date.

          (v) Except as otherwise specified in clause (ii) of this Section 8(f),
     Sellers shall pay 25% of any insurance recovery with respect to any
     Environmental Losses (net of costs of recovery) to Buyer within 30 days of
     receipt of the recovery amount. In the event Sellers receive any recovery
     from third party insurers relating to Post-Closing Environmental Losses,
     Sellers shall pay 100% of any such insurance recovery to Buyer within 30
     days of receipt of the recovery amount.

          (vi) (A) Notwithstanding anything in this Agreement to the contrary,
     but subject to the provisions of Section 8(f)(ii), the indemnification
     procedures in this Section 8(f)(vi) shall apply to any claim for payment or
     reimbursement under Section 8(f)(iii)(B) with respect to Timely Non-
     Allowable Costs (collectively "Environmental Claims").

               (B) Any Environmental Claim which is of the nature of a third
          party claim shall also be governed by the procedures set forth in
          Section 11(f) hereof, it being understood that any inconsistencies
          between Section 11(f) and this Section 8(f)(vi) shall be resolved in
          favor of the provisions set forth in this Section.

               (C)   (1) Buyer shall notify FMC in writing promptly after
          learning of the existence of an Environmental Claim, which notice
          shall describe in reasonable detail the claim, the amount thereof (if
          known and quantifiable), and a reasonably detailed description of the
          facts giving rise to such claim, except that a failure to provide
          prompt notice shall only serve to limit Buyer's indemnification rights
          hereunder to the extent that FMC is prejudiced by such failure.

                     (2) Upon assertion by Buyer of a claim covered hereunder,
          FMC shall be entitled (but not obligated) to assume Principal
          Management of the subject matter of such claim. To assume Principal
          Management, FMC must notify Buyer within 30 days of its receipt of
          said notice that it intends to assume Principal Management. In the
          event FMC does not elect to undertake Principal Management, Buyer
          shall assume Principal Management of the subject matter of the
          Environmental Claim.

                     (3) The party not exercising Principal Management with
          respect to a particular matter shall be entitled, at its sole cost and
          expense, to reasonably participate in the management of the
          Environmental Claim. Such participation shall include, without
          limitation: (i) the right to receive copies of all material reports,
          workplans and analytical data submitted to governmental agencies, all
          material notices or other letters or documents received from
          governmental agencies, any other documentation and correspondence
          materially bearing on the Environmental Claim;

                                      -41-
<PAGE>
 
          (ii) the right of reasonable consultation with the party exercising
          Principal Management; and (iii) as to proposed plans of remediation to
          be submitted to governmental agencies, the right of reasonable advance
          review and approval of such plans, which approval shall not be
          unreasonably withheld or delayed.

                     (4) In the event it undertakes Principal Management of any
          matter, FMC shall, upon reasonable notice to Buyer, have reasonable
          access to the relevant subject facility of Buyer and/or UDLP.

                     (5) The party undertaking Principal Management hereunder
          for any matter shall manage the matter in good faith and in a
          responsible manner, and any activities conducted in connection
          therewith shall be undertaken promptly and completed reasonably
          expeditiously and in a cost effective manner using commercially
          reasonable efforts. The parties agree to reasonably cooperate with one
          another in connection with addressing any matter hereunder.

                     (6) Any remedial or corrective action covered hereunder
          shall be deemed to have been adequately completed to the extent that
          it attains compliance in a cost effective manner with applicable
          Environmental Requirements or is completed to the satisfaction of an
          appropriate governmental body.

                     (7) For purposes of this Agreement, the term "Principal
          Management" means the authority to principally direct the handling of
          the subject matter of an environmental matter, including, without
          limitation, (1) selection of consultants, contractors, experts or
          advisors, (2) evaluation, selection and implementation of remedial
          measures and (3) negotiations with or challenges to any governmental
          body and third parties.

          (g) Written Materials and Records.

                                      -42-
<PAGE>
 
          (i) After the Closing, Buyer may use and distribute products, shipping
     materials, purchase orders, invoices, sales, promotional or other forms and
     literature which bear the name "FMC" or "Harsco" or the "FMC" or "Harsco"
     design trademark if Buyer attaches a sticker or name plate previously
     approved by FMC or Harsco, as applicable, which discloses the acquisition
     of UDLP by Buyer. The right granted in the immediately preceding sentence
     shall terminate, in the case of inventory of UDLP existing as of the
     Closing Date, on the earlier of date when Buyer has sold all of such
     inventory and the one year anniversary of the Closing Date. In addition,
     such right shall terminate, in the case of shipping materials, purchase
     orders, invoices, sales, promotional or other forms and literature, 180
     days following the Closing Date. Once such right has terminated, Buyer
     shall deliver or cause to be delivered to each Seller, as applicable, or
     destroy or cause to be destroyed (with a certification of such
     destruction), all of such items bearing the name "FMC" or "Harsco" or the
     "FMC" or "Harsco" design trademark and Buyer further agrees that it shall,
     and shall cause UDLP to, cease to use or display names or materials bearing
     the name "FMC" or "Harsco" or the "FMC" or "Harsco" design trademark or any
     variant thereof or name confusingly similar thereto or to any name or
     trademark retained by FMC Corporation or Harsco. Notwithstanding the
     foregoing, Buyer will (i) remove all signs bearing the name "FMC" or
     "Harsco" or the "FMC" or "Harsco" design trademark from the Properties
     within six months following the Closing Date and (ii) use commercially
     reasonable efforts to cause the Foreign Affiliates to cease, as soon after
     the Closing as possible, using the name "FMC" or the "FMC" design trademark
     in connection with their respective business operations and as part of
     their respective corporate names (it being understood that the Foreign
     Affiliates may continue to use such names and design trademarks in
     accordance with the foregoing, but in any event for no longer than three
     years after the Closing Date; provided that, if required to continue to use
     the name under existing contracts, such three year period shall not apply).

          (ii) Buyer and Sellers agree that Sellers may maintain copies of any
     books and records of and other financial, tax, personnel and operations
     data relating to the Business (collectively, the "Records") and, within six
     months following the Closing Date, FMC may prepare a comprehensive index
     and file plan of such Records reasonably acceptable to Buyer (the "File
     Plan"). Buyer agrees to maintain such Records in a manner consistent with
     the File Plan for a period of not less than ten years from the Closing Date
     (plus any additional time during which a party has been advised that there
     is an ongoing legal proceeding or investigation or tax audit with respect
     to periods prior to the Closing Date, or such period is otherwise open to
     assessment). During such period, Buyer agrees to give Sellers and their
     representatives reasonable cooperation, access (including copies) and staff
     assistance, as needed, during normal business hours and upon reasonable
     notice, with respect to the Records, and Sellers agree to give Buyer and
     its representatives reasonable cooperation, access and staff assistance, as
     needed, during normal business hours and upon reasonable notice, with
     respect to the books and records and other financial data relating to the
     Business as may be necessary for general business purposes, including the
     preparation of tax returns and financial statements, the management and
     handling of tax audits and any closing out of outstanding contracts;
     provided, however, that such cooperation, access and assistance does not
     unreasonably disrupt the normal operations of Buyer or Sellers. Buyer shall
     not destroy

                                      -43-
<PAGE>
 
     or otherwise dispose of the Records for the period set forth in the second
     sentence of this clause (ii) without the written consent of Sellers. Each
     party shall be entitled to reimbursement for its reasonable out-of-pocket
     costs in connection with the provision of such access.

          (h) Transferred Employees and Employee Benefits.

               (i) Effective on the Closing Date, Buyer shall cause UDLP to
     offer employment to each person designated on Schedule 8(h)(i) attached
     hereto with salary and wages and with employee benefits that are
     substantially comparable in the aggregate to those provided to such persons
     by FMC immediately prior to the date of such offer, and Buyer shall cause
     UDLP to, and UDLP shall, employ on such terms each such person who accepts
     such offer (such employees being referred to herein collectively as the
     "Transferred Employees"). The Transferred Employees shall include, in
     addition to those actively at work who accept such offer, all employees on
     leaves of absence, including those on long-term or short-term disability or
     on lay-off which accept such offer. Upon the hiring of the Transferred
     Employees by UDLP, Buyer shall cause UDLP to, and UDLP shall, (i) for
     benefit accrual purposes, recognize all service of such employees
     recognized by FMC (including predecessor employer service) under all
     employee benefit plans, programs and policies of UDLP at its value under
     such plans, programs and policies as of the Closing Date and (ii) recognize
     all service of such employees recognized by FMC (including predecessor
     employer service) for all other purposes (excluding benefit accrual) under
     all employee benefit plans, programs and policies of UDLP. The employees
     listed on Schedule 8(h)(i) as retained employees (the "Retained Employees")
     currently perform substantial services for FMC and, accordingly, will be
     employed after the Closing by FMC and will not be deemed to be Transferred
     Employees or UDLP Employees for purposes of this Agreement. From and after
     the Closing Date and until such time as agreed upon by Buyer and FMC, Buyer
     will permit such Retained Employees to continue to have access to UDLP's
     facilities, including without limitation office space, telecommunications
     and computer equipment, and FMC will reimburse Buyer or UDLP (in an amount
     to be agreed upon by FMC and Buyer) for costs incurred by UDLP in providing
     such access.

               (ii) (A) With respect to the Transferred Employees, effective as
             of the Closing Date, Buyer shall cause UDLP to waive pre-existing
             condition exclusions, evidence of insurability provisions, waiting
             period requirements or similar provisions under the UDLP health,
             dental, disability, accidental death and dismemberment and life
             insurance plans to the extent such exclusions, requirements and
             provisions had been waived or satisfied under the FMC Employee
             Benefit Plans as of the Closing Date. In addition, Buyer shall
             cause the UDLP health and dental plans to credit the Transferred
             Employees with amounts credited under the FMC health and dental
             plans toward the satisfaction of annual deductible and out-of-
             pocket maximums under the UDLP plans during the calendar year which
             includes the Closing Date. FMC agrees to provide to Buyer within 
             30 days after the Closing Date such participation,

                                      -44-
<PAGE>
 
             coverage and benefits information requested by Buyer in connection
             with the foregoing.

               (B)  FMC and its benefit plans shall assume, pay, perform and
             discharge when due all obligations of UDLP with respect to the
             Retained Employees (other than obligations with respect to benefits
             accrued on or prior to the Closing Date, if any, under UDLP
             Employee Benefit Plans) and shall retain all liability and be
             responsible for all obligations of FMC and the FMC Employee Benefit
             Plans with respect to the Retained Employees and any FMC employee
             who refuses an offer of employment from Buyer as specified in
             Section 8(h)(i).

               (iii) Prior to the Closing Date (if practicable), but in any
     event not later than December 30, 1997, FMC shall cause to be transferred
     from the FMC Corporation Salaried Employees' Retirement Plan (the "FMC
     Salaried Plan") to a new pension plan adopted by FMC that will be intended
     to be qualified under Code Section 401(a) and that will mirror the terms of
     the FMC Salaried Plan applicable to UDLP employees and former employees as
     of the date of transfer (the "Defense Segment Plan") assets equal to the
     benefits accrued under the FMC Salaried Plan as of the Closing Date
     (determined in accordance with the actuarial assumptions and methods set
     forth in Schedule 8(h)(iii) but in no event greater than the amount
     permitted to be transferred under Section 414(l) of the Code and the
     regulations thereunder) by all participants in the FMC Salaried Plan who
     were associated with the FMC defense business prior to January 1, 1994,
     and/or who are or were employed by UDLP. In addition, on or before December
     31, 1997, FMC shall contribute to the Defense Segment Plan any amounts
     required by the Department of Defense to satisfy the applicable provisions
     of Cost Accounting Standard ("CAS") 413 and any other CAS or Federal
     Acquisition Regulation provisions which are applicable. The assets of the
     Defense Segment Plan shall continue to be held by and invested under the
     FMC Master Trust and may be invested as permitted pursuant to the terms of
     such plan and the FMC Master Trust. Effective on the Closing Date, Buyer
     shall become the sponsor of the Defense Segment Plan and assume all
     liabilities associated therewith, and, as soon as possible following the
     Closing Date, FMC shall cause all of the assets associated with the Defense
     Segment Plan to be transferred from the FMC Master Trust to a pension trust
     designated by Buyer. Notwithstanding the above, if it is not possible by
     the Closing Date to finalize the amount of assets to be transferred from
     the FMC Salaried Plan to the Defense Segment Plan or to finalize such other
     amount to be contributed by FMC, then, no later than the Closing Date, FMC
     shall cause to be transferred from the FMC Salaried Plan and contributed by
     FMC to the Defense Segment Plan a substantial portion of such assets and
     contributions and, as soon as possible after the Closing Date, but in no
     event later than September 15, 1998, FMC shall cause to be transferred from
     the FMC Salaried Plan and/or contribute to the Defense Segment Plan the
     amounts necessary to complete the transfer (which, in the case of the
     transfer of assets from the FMC Salaried Plan, shall include earnings
     attributable to such additional amount from the first transfer date to the
     date of final transfer, and in the case of contributions from FMC shall
     include earnings attributable to such amount from the first transfer date
     to the date of final transfer). In addition, as soon as possible following
     the Closing Date, FMC shall cause to be transferred

                                      -45-
<PAGE>
 
     from the FMC Salaried Plan to the Defense Segment Plan (or such other
     pension plan for UDLP Employees so designated by Buyer) assets equal to the
     benefits accrued under the FMC Salaried Plan as of the Closing Date
     (determined in accordance with the actuarial assumptions and methods set
     forth on Schedule 8(h)(iii) but in no event greater than the amount
     permitted to be transferred under Section 414(l) of the Code and the
     regulations thereunder) by the Transferred Employees plus earnings
     attributable to such assets from the Closing Date to the date of transfer
     and minus benefit payments made with respect to any Transferred Employee.
     The calculation of the benefit and asset transfer amounts contemplated by
     this Section 8(h)(iii) shall be first made by FMC's actuary. Buyer's
     actuary shall be provided with sufficient data to replicate such
     calculation prior to the actual date of transfer. Any disputes regarding
     the correctness of these calculations or FMC's compliance with this Section
     8(h)(iii) shall be resolved in accordance with Section 29 of this
     Agreement. No later than 60 days following the Closing Date, FMC and Buyer
     shall cooperate to file any necessary governmental forms with respect to
     the above-described transfer of assets and liabilities. Following the
     completion of each such transfer of assets and liabilities, the appropriate
     UDLP plan other than the San Jose Plan shall assume all liability for such
     liabilities as of the Closing Date. Notwithstanding the above, FMC shall
     retain all liabilities under the FMC Salaried Plan which are funded
     pursuant to group annuity contracts issued by Aetna and The Prudential
     Insurance Company of America and will retain such insurance contracts.
     Prior to the Closing Date, FMC shall cause UDLP to spin off from the FMC
     Corporation Retirement Plan for Hourly Employees -- San Jose (the "San Jose
     Plan") into an appropriate FMC pension plan, the assets and liabilities of
     the "commercial segment" thereof. The participants covered by the
     "commercial segment" are those participants who are not currently and were
     not previously employed by UDLP or FMC in the defense business (other than
     employees of FMC's Corporate Technology Center). Prior to the Closing Date
     and prior to the date FMC causes UDLP to transfer such assets and
     liabilities, FMC's actuary and Buyer's actuary shall agree on such amount
     to be transferred by UDLP using reasonable, agreed actuarial and accounting
     methods and assumptions. Also, if the U.S. Department of Defense concludes,
     either before or after the Closing Date, that any portion of the assets so
     transferred by UDLP should not have been transferred, FMC shall return such
     amount to the San Jose Plan with appropriate interest thereon.

               (iv) Effective on the Closing Date, the Transferred Employees
     shall be eligible to participate in the United Defense Limited Partnership
     Salaried Employees' Plan (the "UDLP Thrift Plan") in accordance with the
     terms of such plan and shall no longer be eligible to make contributions
     under the FMC Employees' Thrift and Stock Purchase Plan (the "FMC Thrift
     Plan"). As soon as possible following the Closing Date, the UDLP Thrift
     Plan shall accept a direct trust-to-trust transfer from the FMC Thrift Plan
     of cash and other property (including FMC common stock) equal to the total
     account balances with respect to the Transferred Employees. Prior to such
     transfer of assets, UDLP shall provide to FMC an opinion letter of outside
     counsel to Buyer that such counsel knows of no reason why the current
     favorable determination letter issued by the Internal Revenue Service with
     respect to the UDLP Thrift Plan should be revoked solely as a result of
     changes made or actions taken by UDLP or Buyer on or after the Closing
     Date. Following such transfer of account

                                      -46-
<PAGE>
 
     balances, the UDLP Thrift Plan shall assume all liability for benefits with
     respect to the amounts transferred from the FMC Thrift Plan.

               (v) For a period of one year following the Closing Date, Buyer
     agrees, and agrees to cause UDLP or its successor to the Business, (I) to
     provide to employees of UDLP employed as of the Closing Date (including the
     Transferred Employees) (the "UDLP Employees") salaries, wages and employee
     and retirement benefits that are substantially comparable in the aggregate
     as those provided to such employees immediately prior to the Closing Date
     and (II) to provide to or on behalf of former employees of UDLP or of any
     predecessor employer retiree medical insurance, retiree life insurance and
     any other retiree benefits that are substantially the same as those
     provided by UDLP or FMC to or on behalf of such former employees as of the
     Closing Date. Buyer shall cause UDLP to retain and discharge all
     liabilities with respect to current or former UDLP Employees (including
     current or former FMC and Harsco employees whose liabilities were assumed
     by UDLP) assumed by UDLP upon its formation. Notwithstanding the foregoing,
     nothing in this clause (v) or elsewhere in this Agreement shall be deemed
     to restrict or otherwise prevent or prohibit Buyer or UDLP from terminating
     after the Closing Date any UDLP Employees, to the extent permitted by
     applicable law and applicable collective bargaining or other employment-
     related agreements. If within one year following the Closing Date Buyer or
     UDLP either terminates (other than for Cause) any such UDLP Employee or
     subjects any such UDLP Employee to an indefinite lay-off, Buyer shall pay
     to such UDLP Employee severance pay in an amount equal to the greater of
     (A) the amount that would have been due such UDLP Employee under the UDLP
     severance pay plan attached hereto as Schedule 8(h)(v) if such UDLP
     Employee was terminated by UDLP and (B) the amount due such UDLP Employee
     under the Buyer severance pay plan applicable to such UDLP Employee. Buyer
     shall recognize, for all purposes of any such severance plan and any other
     employee benefit plan applicable to any such UDLP Employee, the service of
     such UDLP Employee with any of the Sellers, UDLP or other Affiliates of
     either Seller prior to the Closing Date to the extent recognized by similar
     plans of UDLP or FMC, as applicable, prior to the Closing Date, provided
     that for benefit accrual purposes Buyer shall recognize such service only
     at its value under such plans as of the Closing Date. For purposes of
     calculating the pension payable with respect to a UDLP Employee entitled to
     the severance described above, the early commencement reduction factor
     shall be applied assuming the termination of employment was "in connection
     with a permanent reduction in force" within the meaning of the UDLP pension
     plan. For purposes of this Section 8(h), the term "Cause" shall mean (A)
     any material failure by a UDLP Employee to perform his or her duties or any
     material failure by a UDLP Employee to obey policy directives from his or
     her supervisor, (B) the commission by a UDLP Employee of an act of fraud,
     misappropriation, embezzlement or any other act involving moral turpitude
     or constituting a felony or (C) the commission by a UDLP Employee of any
     act of dishonesty which injures Buyer or UDLP.

               (vi) As soon as practicable following the Closing Date, FMC shall
     cause to be transferred from the FMC master pension and thrift plan trusts
     (the "FMC Master Trusts")

                                      -47-
<PAGE>
 
     to new or existing pension and thrift plan trusts maintained by Buyer or
     UDLP assets held in the FMC Master Trusts which relate to the UDLP pension
     and thrift plans.

               (vii) As soon as practicable following the Closing Date, FMC
     shall cause to be transferred to UDLP, and Buyer shall cause UDLP to
     assume, the FMC Section 501(c)(9) benefit trusts for hourly employees, and
     FMC shall cause to be transferred to a new or existing Section 501(c)(9)
     benefit trust maintained by UDLP or Buyer assets from the FMC Section
     501(c)(9) benefit trust for salaried employees equal to the portion of the
     assets in such trust which relate to UDLP retiree medical and life
     insurance benefits.
     
               (viii) Except as provided in this subparagraph (viii), it is
     agreed that, following the Closing Date, each Seller will be responsible
     for, and will reimburse UDLP with respect to, all payments made by UDLP
     after the Closing Date to any of such Seller's former employees for
     workers' compensation benefits relating to occurrences prior to January 1,
     1994. The obligations on the part of each Seller to make such payments
     shall continue for so long as any such payments become due to any former
     employee of such Seller. With respect to any workers' compensation claim
     based upon conditions arising out of facts or circumstances occurring both
     before and after January 1, 1994, the obligations of each Seller shall be
     determined in accordance with applicable governmental regulations governing
     the apportionment of responsibility for workers' compensation between
     predecessor and successor employers. Buyer hereby agrees that Buyer and
     UDLP shall be solely responsible for any workers' compensation claim based
     upon conditions arising out of facts or circumstances occurring solely on
     or after January 1, 1994 and acknowledge and agree that in no event shall
     any Seller be responsible for any such workers' compensation claim.

               (ix) Notwithstanding anything to the contrary contained in any
     applicable FMC stock option plan or any applicable stock option agreement,
     FMC and Buyer agree that each Transferred Employee shall have the right to
     exercise any outstanding stock option granted to him under any such plan
     that is vested as of the Closing Date within the earlier of (A) two years
     from the Closing Date and (B) the scheduled expiration date of any such
     option.

               (x) Effective as of the Closing Date, no participant in the UDLP
     Thrift Plan shall be eligible to purchase any additional shares of FMC or
     Harsco common stock under the UDLP Thrift Plan. Effective on the Closing
     Date and for a period of two years following the Closing Date, Buyer shall
     cause the UDLP Thrift Plan to be amended to cause UDLP to allow each
     employee of UDLP to sell all or any portion of the FMC or Harsco common
     stock allocated to such employee's account under the UDLP Thrift Plan. In
     addition, no less than ten business days prior to the expiration of such
     two-year period, Buyer agrees to discuss in good faith with FMC and Harsco
     the repurchase by FMC of any FMC common stock and the repurchase by Harsco
     of any Harsco common stock remaining in the UDLP Thrift Plan.

               (xi) Each UDLP Employee who participated immediately prior to the
     Closing in the FMC 1995 Management Incentive Plan (the "MIP") shall receive
     a BPI Award (as defined below) with respect to the Three-Year Period (as
     defined in the MIP) ending December 31, 1997 and with respect to the Three-
     Year Period (as defined in the MIP) ending

                                      -48-
<PAGE>
 
     December 31, 1998. Buyer or UDLP shall pay each such BPI Award that is
     accrued for on the Closing Statement to the applicable UDLP Employee at the
     time when FMC makes payment of the BPI Awards to other participants in the
     MIP, unless such BPI Award has previously been paid to such UDLP Employee.
     For purposes of this Agreement, the term "BPI Award" shall mean a Three-
     Year Incentive Award within the meaning of the MIP. In addition, each UDLP
     Employee who participated immediately prior to the Closing in the MIP shall
     receive an annual performance incentive award with respect to the calendar
     year ending December 31, 1997. Buyer or UDLP shall pay each such annual
     performance incentive award that is accrued for on the Closing Statement to
     the applicable UDLP Employee at the time when FMC makes payment of the
     annual performance incentive awards to other participants in the MIP,
     unless such award has previously been paid to such UDLP Employee.

               (xii) As of the Closing, FMC shall pay to each UDLP Employee the
     amounts due and payable to such UDLP Employee as incentive payments under
     any UDLP letter agreement applicable to such UDLP Employee as described on
     Schedule 8(h)(xii) hereto. At the Closing, UDLP shall pay to FMC an amount
     in cash equal to the aggregate amount of all such incentive payments so
     made by FMC and such payment shall reduce the cash of UDLP or be reflected
     as a liability of UDLP on the Closing Statement for the purposes of
     determining the Adjusted Net Worth Amount as of the Closing Date. In
     addition, after the Closing, Buyer shall pay to each UDLP Employee the
     amounts due and payable to such UDLP Employee as severance payments under
     any UDLP letter agreement applicable to such UDLP Employee as described on
     Schedule 8(h)(xii) hereto with respect to any such UDLP Employee terminated
     after Closing.

               (xiii) Without limitation to the provisions of Section 11 and in
     addition thereto, each Seller shall indemnify Buyer, its Affiliates and
     each of its officers, directors and employees and hold them harmless from
     any Losses suffered or incurred by any such indemnified party to the extent
     arising from (i) any failure of the benefit formula in effect as of the
     date hereof under the United Defense CSD Salaried Employees Pension Plan to
     comply with the requirements of ERISA or the Code, (ii) the matters
     relating to the exceptions to the representations and warranties of Sellers
     set forth on Schedule 4C(k) (other than those exceptions identified on
     Schedule 4C(k) as not subject to this subparagraph) and (iii) Federal labor
     law or any collective bargaining agreement by reason of the transfer of
     assets and liabilities of the "commercial segment" of the San Jose Plan
     described in Section 8(h)(iii). The indemnification obligations of Sellers
     pursuant to this Section 8(h)(xiii) shall not be subject to any limitations
     imposed on the indemnification obligations of Sellers set forth in Section
     11 hereof.

          (i) Mutual Release. Except as otherwise specifically set forth herein
or on Schedule 7(f) hereto, effective as of the Closing:

          (i) Buyer and UDLP hereby unconditionally and irrevocably release and
     discharge each Seller and its respective Affiliates, successors, assigns,
     directors, officers,

                                      -49-
<PAGE>
 
     partners, members, employees and representatives (collectively, the "Seller
     Released Parties") from and against any and all actions, causes of action,
     suits, debts, dues, sums of money, accounts, reckonings, liabilities,
     covenants, contracts, controversies, agreements, promises, damages,
     judgments, claims and demands of whatever nature that Buyer or UDLP or
     their respective Affiliates, successors, assigns, directors, officers,
     partners, members, employees and representatives (collectively, the "Buyer
     Released Parties") ever had, now have or hereafter may or shall have that
     arise from, are related to, connected with or that concern the
     Participation Agreement among FMC Corporation, Harsco and UDLP dated as of
     January 1, 1994, the Partnership Agreement among such parties of even date
     therewith and the other agreements contemplated thereby.

          (ii) Sellers hereby unconditionally and irrevocably release and
     discharge the Buyer Released Parties from and against any and all actions,
     causes of action, suits, debts, dues, sums of money, accounts, reckonings,
     liabilities, covenants, contracts, controversies, agreements, promises,
     damages, judgments, claims and demands of whatever nature that the Seller
     Released Parties ever had, now have or hereafter may or shall have that
     arise from, are related to, connected with or that concern the
     Participation Agreement among FMC Corporation, Harsco and UDLP dated as of
     January 1, 1994, the Partnership Agreement among such parties of even date
     therewith and the other agreements contemplated thereby.

          (j) Insurance.  Buyer acknowledges that Sellers and their respective
Affiliates shall have no responsibility for obtaining any insurance or bearing
any loss, liability, claim, damage or expense relating to the assets, business,
operations, conduct, products and employees (including former employees) of
UDLP, the Subsidiaries or the Foreign Affiliates that relates to or arises out
of occurrences subsequent to the Closing other than as provided herein.  Nothing
in this Section 8(j) shall modify the rights or obligations of the parties with
respect to indemnification obligations or the responsibility for losses,
liabilities, damages or expenses that relates to or arises out of occurrences
prior to the Closing which is provided for elsewhere in this Agreement.

          (k) Transition Services Agreement.  At the Closing, FMC and Buyer 
shall execute and deliver the form of Transition Services Agreement attached
hereto as Exhibit 8(k) (the "Transition Services Agreement"). The parties shall
cooperate in good faith to negotiate and provide prior to Closing each annex to
such agreement. Promptly following the execution of this Agreement,
representatives of FMC and Buyer shall meet to develop a transition plan which
will identify services, service periods and service charges to be provided
pursuant to the Transition Service Agreement and which will, to the extent
practicable, be completed prior to the Closing.

          (l) Technology and Environmental Services Agreement.  At the Closing,
FMC and Buyer shall execute and deliver the form of Technology and Environmental
Services Agreement attached hereto as Exhibit 8(l) (the "Technology and
Environmental Services Agreement").  The parties shall cooperate in good faith
to negotiate and provide prior to Closing each annex to such agreement.

                                      -50-
<PAGE>
 
          (m) Lease.  At the Closing, FMC and UDLP shall execute and deliver the
form of Amended and Restated Lease attached hereto as Exhibit 8(m) (the
"Lease"), pursuant to which UDLP shall lease certain buildings and real property
in Santa Clara County, California owned by FMC, including certain properties
currently leased by UDLP and certain properties used by FMC's Corporate
Technology Center.

          (n) Intellectual Property Agreements.  At the Closing, FMC and UDLP
shall execute and deliver the form of Amended and Restated FMC Intellectual
Property Agreement attached hereto as Exhibit 8(n)-1 (the "FMC Intellectual
Property Agreement") and Harsco and UDLP shall execute and deliver the form of
Amended and Restated Harsco Intellectual Property Agreement attached hereto as
Exhibit 8(n)-2 (the "Harsco Intellectual Property Agreement").

          (o) Intellectual Property Recordations.  From and after the Closing, 
at the written request of Buyer, FMC or Harsco, as applicable, will cooperate
with Buyer to cause any FMC Transferred IP Rights (as defined in the FMC
Intellectual Property Agreement, dated as of January 1, 1994, by and between FMC
and UDLP) or Harsco Transferred IP Rights (as defined in the Harsco Intellectual
Property Agreement, dated as of January 1, 1994, by and between Harsco and
UDLP), the transfer of ownership to UDLP of which shall not have been, prior to
the Closing Date, officially recorded with appropriate authorities in any
applicable jurisdiction, to be so officially recorded in the name of UDLP, Buyer
or one of Buyer's Affiliates (as instructed in writing by Buyer), the cost of
which will be shared equally by Sellers and Buyer.

          (p) Cash Balance as of the Closing.  As of the Closing Date, FMC shall
make a good faith estimate of the aggregate liability of UDLP for all
outstanding checks to be included in accounts payable on the Closing Statement.
Sellers agree that, as of the Closing, UDLP shall have cash or cash equivalents
having an aggregate value equal or greater than such estimated liability for
outstanding checks.

          (q) FNSS Royalty Dispute.  To the extent that Sellers have any 
liability in respect of the Retained Liability set forth as Item III.4. on
Schedule 7(f), Buyer agrees that the amount of any such liability shall be
reduced by the aggregate amount of royalty payments withheld by FNSS in respect
of periods prior to the Closing Date. Sellers agree that they shall not settle
the FNSS litigation described on Schedule 4C(i) in any manner adverse to UDLP or
Buyer without the consent of Buyer (which consent shall not be unreasonably
withheld).

          9.  Further Assurances.  From time to time, as and when requested by
any party hereto, any other party hereto shall execute and deliver, or cause to
be executed and delivered, all such documents and instruments and shall take, or
cause to be taken, all such further or other actions (subject to any limitations
set forth in this Agreement), as such other party may reasonably deem necessary
or desirable to consummate the transactions contemplated by this Agreement.

          10.  Tax Matters.

                                      -51-
<PAGE>
 
          (a) Prior to Closing, Buyer and Sellers will agree to allocate an
amount of the Final Purchase Price to the covenants contained in Section 5(e)
hereof. Buyer and Sellers will allocate the balance of the Final Purchase Price
among the assets of UDLP based on the appraisal obtained by Buyer at Buyer's
expense, subject to Sellers' approval (which approval shall not be unreasonably
withheld). Buyer and Sellers will determine the Income Tax consequences of the
purchase and sale of the Interests and covenants contained in section 5(e) in a
manner consistent with such allocation. Each of Buyer, UDLP, the Subsidiaries,
the Foreign Affiliates and Sellers will file all Income Tax Returns (including
amended returns and claims for refund) in a manner consistent with such
allocation and this Section 10(a).

          (b) Sellers shall indemnify and hold harmless any Buyer Indemnified
Party from and against all Income Taxes (i) with respect to all periods of UDLP
or the Subsidiaries ending on or prior to the Closing Date and (ii) with respect
to any period of any of UDLP or the Subsidiaries beginning before the Closing
Date and ending after the Closing Date, but only with respect to Income Taxes
attributable to that portion of such period up to and including the Closing Date
(such portion, a "Pre-Closing Partial Period"). Sellers shall indemnify and hold
harmless any Buyer Indemnified Party from and against UDLP's Share of any Taxes
of the Foreign Affiliates (x) with respect to all periods of the Foreign
Affiliates ending on or prior to the Closing Date, (y) with respect to any Pre-
Closing Partial Period of the Foreign Affiliates and (z) attributable to any
breach of the representations contained in Section 4C(l), but only to the extent
that UDLP's Share of such Taxes described in (x), (y) and (z) exceeds the sum of
$4 million (the "Foreign Affiliate Tax Basket") and UDLP's Share of the reserves
or accruals for Income Taxes and Other Taxes, accrued but not payable, reflected
in the Foreign Affiliate Closing Date Balance Sheets. Notwithstanding anything
in this Agreement to the contrary, (i) Sellers shall not be required to
indemnify any Buyer Indemnified Party for Taxes to the extent of the aggregate
reserves therefor taken into account in the preparation of the Closing Balance
Sheet (and in the case of Taxes of any Foreign Affiliate accrued but not payable
that are reflected in the Foreign Affiliate Closing Date Balance Sheets) and
(ii) Sellers shall not be required to indemnify any Buyer Indemnified Party for
any Taxes attributable to a Tax period (or partial Tax period) beginning on or
after the Closing Date. Sellers shall be entitled to any net refunds of Taxes
(including interest thereon) with respect to any Tax period (or partial Tax
period) of any of UDLP and its Subsidiaries ending on or before the Closing
Date, except to the extent such refund arises as the result of a carryback of a
loss or other Tax benefit from a period beginning after the Closing Date, and
any refunds of Taxes attributable to an amount paid by Sellers under this
Section. UDLP's share of any net refunds of Taxes (including interest thereon)
with respect to any Tax period (or partial Tax period) of any Foreign Affiliate
ending on or before the Closing Date (except to the extent such refund arises as
the result of a carryback of a loss or other Tax benefit from a period beginning
after the Closing Date) shall be added to the Foreign Affiliate Tax Basket.

          (c) Buyer shall indemnify and hold harmless each Seller Indemnified
Party from and against all Taxes (i) with respect to all periods of any of UDLP,
its Subsidiaries, and the Foreign Affiliates beginning after the Closing Date,
(ii) with respect to any period of UDLP, its Subsidiaries, and the Foreign
Affiliates beginning before the Closing Date and ending after the Closing Date,
but only with respect to the portion of such period beginning the day after the
Closing Date (such

                                      -52-
<PAGE>
 
portion, a "Post-Closing Partial Period"), or (iii) payable as a result of any
events occurring on the Closing Date, but after the Closing, which are outside
of the ordinary course of business. Buyer shall be entitled to all refunds of
Taxes with respect to the periods described in clauses (i) and (ii) above.

          (d) Any Income Taxes of UDLP or its Subsidiaries or any Taxes of the
Foreign Affiliates for a period including a Pre-Closing Partial Period and a
Post-Closing Partial Period shall be apportioned between such Pre-Closing
Partial Period and such Post-Closing Partial Period, based, in the case of real
and personal property Taxes, on a per diem basis and, in the case of other
Taxes, on the actual activities, taxable income or taxable loss of UDLP or its
Subsidiaries or the Foreign Affiliates, as the case may be, during such Pre-
Closing Partial Period and such Post-Closing Partial Period.

          (e) Sellers and Buyer agree to give prompt notice to each other of any
proposed adjustment to Taxes for periods of UDLP, its Subsidiaries and the
Foreign Affiliates ending on or prior to the Closing Date or any Pre-Closing
Partial Period.  Sellers and Buyer shall cooperate with each other in the
conduct of any audit or other proceedings involving UDLP for such periods and
each may participate at its own expense; provided, however, that Sellers shall
have the right to control the conduct of any such audit or proceeding for which
Sellers and Buyer agree that any resulting Tax is or may be covered by the
indemnity provided in this Section 10 or Section 11; provided further that Buyer
may elect to have counsel of its choosing participate on behalf of UDLP in any
such proceeding.  Notwithstanding the foregoing, Sellers may not settle or
otherwise resolve any such claim, suit or proceeding which would have a material
adverse effect on Buyer's liability for Taxes after Closing without the consent
of Buyer, which consent shall not be unreasonably withheld.

          (f) Sellers, Buyer and UDLP agree to treat all payments made under 
this Section 10, under any other indemnity provision contained in this
Agreement, and in respect of any misrepresentations or breaches of warranties or
covenants as adjustments to the Final Purchase Price for Tax purposes.

          (g) For purposes of this Section 10, all references to Buyer, Sellers,
UDLP, its Subsidiaries and Foreign Affiliates shall include their respective
successors.

          (h) Buyer and Sellers shall each pay one-half of all state, county, or
local sales, excise, value added, use, registration, stamp, or other transfer
Taxes and similar Taxes, levies, charges or fees required to be paid on or as
the result of the transfer of the Interests.

          (i) Filing Responsibility.

          (i) FMC shall prepare and file (or shall cause UDLP to prepare and
     file) all Income Tax Returns for UDLP for any taxable period ending on or
     before the Closing Date and UDLP will pay any Income Taxes owed by UDLP
     with respect to such Income Tax Returns subject to its rights to
     indemnification under Section 10(b).

                                      -53-
<PAGE>
 
          (ii) Buyer and UDLP shall, subject to the provisions of Section
     10(h)(iii) and (iv), file all other Tax Returns with respect to the
     Business and the business and operations of the Foreign Affiliates.

          (iii) With respect to any Income Tax Return of UDLP for taxable
     periods beginning before the Closing Date and ending after the Closing
     Date, Buyer shall cause UDLP to consult with Sellers concerning such Tax
     Return. Buyer shall cause UDLP to provide Sellers a copy of any such
     proposed Tax Return governed by this Section 10(h)(iii) at least 30 days
     prior to the filing of such Tax Return, and Sellers may provide comments to
     UDLP, which comments shall be delivered within 15 days of receiving such
     proposed return from UDLP. Comments shall be subject to the consent of UDLP
     which consent shall not be unreasonably withheld. Any comments for which
     consent has been given or for which consent has been unreasonably withheld
     shall be incorporated into the Tax Returns to which they relate.

          (iv) With respect to any Income Tax Return of UDLP's Subsidiaries or
     any Tax Return of the Foreign Affiliates not described in (i) or (iii) that
     relates to a tax period ending on or before the Closing Date or a tax
     period which includes a Pre-Closing Partial Period, Buyer shall cause UDLP,
     its Subsidiaries or Foreign Affiliates to prepare such Tax Return in
     accordance with past practice and in consultation with Sellers. Buyer shall
     cause UDLP, its Subsidiaries or its Foreign Affiliates to provide Sellers
     with a copy of any such proposed Tax Return governed by this Section
     10(h)(iv) at least 30 days prior to the filing of such Tax Return, and
     Sellers may provide comments to UDLP, the Subsidiaries or the Foreign
     Affiliates which comments shall be delivered within 15 days of receiving
     such proposed Tax Return. Comments shall be subject to the consent of UDLP
     which consent shall not unreasonably be withheld. Any comments for which
     consent has been given or for which consent has been unreasonably withheld
     shall be incorporated into the Tax Returns to which they relate.

          (j) Cooperation and Exchange of Information and Conduct of Tax Audits.

          (i) FMC shall prepare and submit to Buyer no later than three months
     after the Closing Date, 1997 blank tax return workpaper packages. Buyer
     shall, and shall cause UDLP to, prepare completely and accurately and
     submit to Sellers within three months of receipt, all information as FMC
     shall reasonably request in such tax return workpaper packages.

          (ii) As soon as practicable, but in any event within 30 days after
     FMC's request, from and after the Closing Date, Buyer shall provide Sellers
     with such cooperation and shall deliver to Sellers such information and
     data concerning the pre-Closing operations of UDLP, the Subsidiaries and
     the Foreign Affiliates and make available such knowledgeable employees of
     UDLP, the Subsidiaries and the Foreign Affiliates as FMC may request,
     including providing the information and data required by Sellers' customary
     tax and accounting questionnaires, in order to enable Sellers to complete
     and file all Tax Returns which they may be required to file with respect to
     the income of UDLP through the Closing Date or to respond to audits by any
     taxing authorities with respect to the income of UDLP

                                      -54-
<PAGE>
 
     and to otherwise enable Sellers to satisfy their internal accounting, tax
     and other legitimate requirements. Such cooperation and information shall
     include without limitation provision of powers of attorney for the purpose
     of signing Tax Returns and defending audits and promptly forwarding copies
     of appropriate notices and forms of other communications received from or
     sent to any Taxing Authority which relate to UDLP, the Subsidiaries or the
     Foreign Affiliates, and providing copies of all relevant Tax Returns,
     together with accompanying schedules and related workpapers, documents
     relating to rulings or other determinations by any Taxing Authority and
     records concerning the ownership and tax basis of property, which Buyer,
     UDLP, the Subsidiaries or the Foreign Affiliates may possess. Buyer and
     UDLP shall make their respective employees and facilities (and the
     employees and facilities of the Subsidiaries and the Foreign Affiliates)
     available on a mutually convenient basis to provide explanation of any
     documents or information provided hereunder. Sellers shall provide similar
     cooperation to Buyer or UDLP on Buyer's or UDLP's request with respect to
     post-Closing Tax matters.

          (iii) For a period of ten (10) years after the Closing Date, Buyer
     shall, and shall cause UDLP, the Subsidiaries and the Foreign Affiliates
     to, retain all Tax Returns, books and records (including computer files)
     of, or with respect to the activities of, UDLP, the Subsidiaries, the
     Foreign Affiliates or the Business for all taxable periods ending on or
     prior to the Closing Date. Thereafter, Buyer shall not dispose of any such
     Tax Returns, books or records unless it first offers in writing such Tax
     Returns, books and records to FMC and FMC fails to accept such offer within
     sixty (60) days of its being made.

          (iv) FMC shall continue to be the tax matters partner of UDLP as set
     forth in Section 10.8 of the Partnership Agreement between FMC and Harsco,
     dated as of January 1, 1994, for any taxable periods with respect to Income
     Taxes ending on or before the Closing Date.

          (k) (S) 754 Election.  Sellers shall make a valid election under 
Section 754 of the Code, and under any other similar state or local Tax Law, in
the applicable Tax Returns of UDLP to be filed by Sellers. Buyer shall
reasonably cooperate with Sellers in making such elections.

          (l) Notwithstanding anything in this agreement to the contrary, all 
claims for indemnity with respect to Taxes of any Foreign Affiliate shall be
made solely under Section 10(b).

          (m) Definitions.  For purposes of this Section 10, the following terms
shall have the meanings ascribed to them below:

          (i) "Code" means the Internal Revenue Code of 1986, as amended.

          (ii) "Foreign Affiliate Closing Balance Sheet" shall mean each Foreign
     Affiliate's balance sheet as of the Closing Date, stated in United States
     dollars and prepared in accordance with United States generally accepted
     accounting principles in a manner

                                      -55-
<PAGE>
 
     consistent with such Foreign Affiliate's June 30, 1997 balance sheet.
     Copies of both Foreign Affiliates' June 30, 1997 balance sheets are
     attached as Exhibit 10(m).

          (iii) "Income Taxes" means federal, state, local, or foreign income or
     franchise Taxes or other Taxes imposed on or measured by income, together
     with interest or penalties imposed with respect thereto.

          (iv) "Income Tax Returns" means federal, state, local, or foreign Tax
     Returns required to be filed with any Taxing Authority with respect to
     Income Taxes.

          (v) "IRS" means the U.S. Internal Revenue Service.

          (vi) "Other Taxes" means all Taxes which are not Income Taxes.

          (vii) "Tax" or "Taxes" means all federal, state, local, or foreign
     income, gross receipts, estimated, alternative minimum, add-on minimum,
     profits, sales, use, occupation, value added, ad valorem, transfer,
     registration, franchise, employee or other withholding, payroll,
     unemployment, excise, license, property, or other tax, of any kind
     whatsoever, together with any interest, penalties, or additions to tax
     imposed with respect thereto.

          (viii) "Tax Laws" means the Code and any federal, state, local, or
     foreign laws relating to Taxes and any regulations or official
     administrative pronouncements released thereunder.

          (ix) "Tax Returns" means returns, amended returns, declarations,
     reports, claims for refund, information returns, or other documents
     (including any related or supporting schedules, statements, or information)
     filed or required to be filed in connection with the determination,
     assessment or collection of Taxes of any party or the administration of any
     laws, regulations, or administrative requirements relating to any Taxes.

          (x) "Taxing Authority" means any governmental authority, domestic or
     foreign, having jurisdiction over the assessment, determination,
     collection, or other imposition of Tax.

          (xi) "UDLP's Share" with respect to Taxes, Tax accruals and reserves,
     or Tax refunds of a Foreign Affiliate shall mean the product of (a) the
     amount of such Taxes, Tax accruals and reserves, or Tax refunds as the case
     may be and (b) the percentage of common equity interests in such Foreign
     Affiliate owned directly or indirectly by UDLP as of the Closing Date.

          11.  Indemnification.

          (a) Indemnification by Sellers. Each Seller shall indemnify Buyer,
UDLP and their respective Affiliates and each of their respective officers,
directors and employees (collectively,

                                      -56-
<PAGE>
 
"Buyer Indemnified Parties") and defend and hold them harmless from any loss,
liability, cost, damage or expense (including reasonable legal fees and
expenses) but excluding punitive damages (except to the extent awarded to third
parties as a result of a third party claim) ("Losses") suffered or incurred by
any such indemnified party to the extent directly attributable to (i) any breach
or inaccuracy of any representation or warranty of Sellers contained in this
Agreement or the Ancillary Agreements as of the date hereof or as of the Closing
Date (after giving effect to the supplement to the Schedules permitted under
Section 24 hereof), to the extent such Seller is a party thereto, (other than
any representation or warranty contained in Section 4C(n)), (ii) any breach of
any covenant of Sellers contained in this Agreement or the Ancillary Agreements,
to the extent such Seller is a party thereto, (iii) any Retained Liability and
(iv) except as provided in Section 8(h), any liability with respect to any
employee benefit plan (other than the Defense Segment Plan) sponsored,
maintained or contributed to by FMC or any ERISA Affiliate thereof (defined as
any member of the FMC controlled group of companies as defined in Section
414(b), (c), (m) or (o) of the Code) other than UDLP and its Subsidiaries;
provided however, that with respect to (A) any breach by FMC of any
representation or warranty of FMC contained in Section 4A and (B) any breach of
FMC of any covenant contained in Sections 5(c), 5(e) and 8(b), FMC only (and not
Harsco) shall so indemnify Buyer, its Affiliates and each of its officers,
directors and employees, and, with respect to (X) any breach by Harsco of any
representation or warranty of Harsco contained in Section 4B and (Y) any breach
by Harsco of any covenant contained in Section 5(c), 5(e) and 8(b), Harsco only
(and not FMC), shall so indemnify Buyer, its Affiliates and each of its
officers, directors and employees; provided, further, that Sellers shall not
have any liability under clause (i) above unless the aggregate of all Losses
relating thereto for which Sellers would, but for this proviso, be liable
exceeds on a cumulative basis an amount equal to $10,000,000, and then only to
the extent of any such excess; provided further, that Sellers shall not have any
liability under clause (i) above for any individual item where the Loss relating
to such item is less than $25,000 and such items shall not be aggregated for
purposes of the first proviso to this Section 11(a); and provided further, that
Sellers' aggregate liability under clause (i) above shall in no event exceed 10%
of the Final Purchase Price. In no event shall Sellers be liable for any Loss
relating to environmental matters pursuant to this Section 11.

          (b) Exclusive Remedy.  Except as otherwise expressly provided in 
Sections 5(k), 8(f), 8(h), 10 and 23 and except as provided in any supplemental
agreement executed in connection herewith, each party acknowledges and agrees
that, from and after the Closing, its sole and exclusive remedy with respect to
any and all claims relating to the subject matter of this Agreement, the
Purchase and the Ancillary Agreements shall be pursuant to the indemnification
provisions set forth in this Section 11. In furtherance of the foregoing, each
party hereby waives, from and after the Closing, to the fullest extent permitted
under applicable law, any and all rights, claims and causes of action it may
have against the other parties hereto relating to the subject matter of this
Agreement, the Purchase and the Ancillary Agreements arising under or based upon
any federal, state, local or foreign statute, law, ordinance, rule or regulation
or otherwise, provided, however, that no party waives any tort claims it may
have against any other party hereto for intentional fraudulent
misrepresentation; and provided further that nothing in this Section 11(b) shall
affect any rights or remedies that the Sellers may have with respect to each
other.

                                      -57-
<PAGE>
 
          (c) Indemnification by Buyer.  Buyer shall indemnify Sellers, their
Affiliates and their respective officers, directors and employees (collectively,
"Seller Indemnified Parties") against and hold them harmless from any Losses
suffered or incurred by any such indemnified party to the extent directly
attributable to (i) any breach or inaccuracy of any representation or warranty
of Buyer contained in this Agreement or the Ancillary Agreements as of the date
hereof or as of the Closing Date, (ii) any breach of any covenant of Buyer
contained in this Agreement or the Ancillary Agreements contemplated hereby,
(iii) any failure by Buyer or its Affiliates to comply with the provisions of
the Worker Adjustment Retraining and Notification Act of 1988, as amended, or
any similar state or local law or regulation, (iv) any discontinuance,
suspension or modification of any employee benefit plan maintained by Buyer or
UDLP as contemplated by Section 8(h) hereof, (v) subject to Buyer's rights under
Section 11(a), any liability, action, suit, claim or other proceeding which
arises directly or indirectly in connection with Buyer's financing or
refinancing of the Initial Purchase Price or Final Purchase Price, including as
a result of the use of the Financial Statements or other information provided
pursuant to Section 8(e) or otherwise in connection with any such financing or
refinancing or otherwise or (vi) except as otherwise expressly provided in this
Agreement and other than with respect to any Retained Liabilities, all
obligations and liabilities of whatever kind and nature, primary or secondary,
direct or indirect, absolute or contingent, known or unknown, whether or not
accrued, whether arising before, on or after the Closing Date (whether or not
asserted against either Seller in its capacity as a partner of UDLP or
otherwise), of any of UDLP, its Subsidiaries or the Foreign Affiliates,
including, without limitation, any such obligations or liabilities contained in
the Material Contracts or any agreement, lease, license, permit, plan or
commitment that, because it fails to meet the relevant threshold amount or term,
is not included within the definition of Material Contracts; provided however,
that Buyer shall not have any liability under clause (i) above unless the
aggregate of all Losses relating thereto for which Buyer would, but for this
proviso, be liable exceeds on a cumulative basis an amount equal to $10,000,000
and then only to the extent of any such excess; and provided, further, that
Buyer shall not have any liability under clause (i) above for any individual
item where the Loss relating to such item is less than $25,000, and such items
shall not be aggregated for purposes of the first proviso to this Section 11(c).

          (d) Losses Net of Insurance and Tax Benefits.  The amount of any and 
all Losses indemnified under this Agreement shall be determined net of any
amounts recovered or recoverable by the indemnified party under insurance
policies, indemnities or other reimbursement arrangements with respect to such
Losses. Each party hereby waives, to the extent permitted under its applicable
insurance policies, any subrogation rights that its insurer may have with
respect to any indemnifiable Losses. The amount of any and all Losses
indemnified under this agreement shall be reduced by the present value (computed
using the mid-term applicable federal rate under Code (S) 1274, as in effect on
the date hereof) of any Tax benefits realized and to be realized by the
indemnified party with respect to the Loss, and the amount of all Losses shall
be increased by the amount of all additional Taxes (if any) payable by an
indemnified party in respect of any indemnification payment made pursuant to
this Agreement. Any indemnity payment under this Agreement shall be treated as
an adjustment to the Final Purchase Price for tax purposes.

                                      -58-
<PAGE>
 
          (e) Termination of Indemnification.  The obligations to indemnify and 
hold harmless a party hereto with respect to any breach of a representation or
warranty of any party hereto contained in Section 4 or 6, shall terminate when
the applicable representation or warranty terminates pursuant to Section 15;
provided, however, that such obligations to indemnify and hold harmless shall
not terminate with respect to any item as to which the person to be indemnified
or the related party thereto shall have, prior to the expiration of the
applicable period, previously made a claim by delivering a written notice
(stating in reasonable detail the nature of, and factual and legal basis for,
any such claim for indemnification, and the provisions of this Agreement upon
which such claim for indemnification is made) to the indemnifying party.  The
obligation to indemnify and hold harmless a party hereto pursuant to the other
provisions of Sections 11(a) and 11(c) shall not terminate.

          (f) Procedures Relating to Indemnification.

          (i) In the event that a party (the "indemnified party") is entitled to
     any indemnification provided for under this Agreement in respect of,
     arising out of or involving a claim or demand made by any person, firm,
     governmental authority or corporation against the indemnified party (a
     "Third Party Claim"), such indemnified party must notify the indemnifying
     party in writing, and in reasonable detail, of the Third Party Claim as
     promptly as reasonably possible after receipt by such indemnified party of
     notice of the Third Party Claim; provided, however, that failure to give
     such notification on a timely basis shall not affect the indemnification
     provided hereunder except to the extent the indemnifying party shall have
     been actually prejudiced as a result of such failure; provided, further,
     that any notices to be delivered to Sellers collectively as the
     "indemnifying party" shall be delivered to FMC. Thereafter, the indemnified
     party shall deliver to the indemnifying party, within five business days
     after the indemnified party's receipt thereof, copies of all notices and
     documents (including court papers) received by the indemnified party
     relating to the Third Party Claim.

          (ii) If a Third Party Claim is made against an indemnified party, the
     indemnifying party (FMC if on behalf of Sellers collectively or FMC solely,
     or Harsco on behalf of Harsco solely) shall be entitled to participate in
     the defense thereof and, if it so chooses and acknowledges its obligation
     to indemnify the indemnified party therefor, to assume the defense thereof
     with counsel selected by the indemnifying party (FMC if on behalf of
     Sellers collectively or FMC solely, or Harsco on behalf of Harsco solely)
     and reasonably satisfactory to the indemnified party. Notwithstanding any
     acknowledgment made pursuant to the immediately preceding sentence, the
     indemnifying party shall continue to be entitled to assert any limitation
     on its indemnification responsibility contained in the provisos to Section
     11(a) or Section 11(c), as the case may be. Should the indemnifying party
     so elect to assume the defense of a Third Party Claim, the indemnifying
     party shall not be liable to the indemnified party for legal expenses
     subsequently incurred by the indemnified party in connection with the
     defense thereof. If the indemnifying party assumes such defense, the
     indemnified party shall have the right to participate in the defense
     thereof and to employ counsel, at its own expense, separate from the
     counsel employed by the indemnifying party, it being understood,

                                      -59-
<PAGE>
 
     however, that the indemnifying party (FMC if on behalf of Sellers
     collectively or FMC solely, or Harsco on behalf of Harsco solely) shall
     control such defense; provided, however, that the indemnifying party shall
     not be permitted to settle or compromise such Third Party Claim without the
     written consent of each indemnified party subject to such Third Party Claim
     (which consent shall not be unreasonably withheld) unless (i) the
     indemnifying party shall pay or cause to be paid all amounts arising out of
     such settlement concurrently with the effectiveness thereof, (ii) such
     settlement is conditioned upon the full and complete release of each
     indemnified party with respect to such Third Party Claim and (iii) such
     settlement shall not restrict the business or operations of any indemnified
     party in any material respect. The indemnifying party shall be liable for
     the fees and expenses of counsel employed by the indemnified party for any
     period during which the indemnifying party has not assumed the defense
     thereof. If the indemnifying party chooses to defend any Third Party Claim,
     all parties hereto shall cooperate in the defense or prosecution of such
     Third Party Claim. Such cooperation shall include the retention and (upon
     the indemnifying party's request (FMC if on behalf of Sellers collectively
     or FMC solely, or Harsco on behalf of Harsco solely)) the provision to the
     indemnifying party of records and information which are reasonably relevant
     to such Third Party Claim, and making employees available on a mutually
     convenient basis to provide additional information and explanation of any
     material provided hereunder. In the event that the indemnifying party shall
     have assumed the defense of a Third Party Claim, the indemnified party
     shall not admit any liability with respect to, or settle, compromise or
     discharge, such Third Party Claim without the indemnifying party's (FMC's
     if on behalf of Sellers collectively or FMC solely, Harsco's if on behalf
     of Harsco solely) prior written consent (which consent shall not be
     unreasonably withheld). If the applicable indemnifying party does not
     assume the defense of a Third Party Claim, the applicable indemnified
     parties may defend against such claim in any reasonable manner as such
     indemnified parties may deem appropriate, including settling such Third
     Party Claim on such terms as such indemnified parties may deem appropriate
     without the consent of any indemnifying party.

          12.  Assignment.  Except as set forth below, this Agreement and any
rights and obligations hereunder shall not be assignable or transferable by
Buyer or any Seller without the prior written consent of the other parties and
any purported assignment without such consent shall be void and without effect;
provided, however, that, without the consent of Sellers, (i) Buyer may assign
its right to purchase the Interests hereunder to one or more wholly-owned
subsidiaries of Buyer upon written notice of such assignment to FMC (it being
understood, however, that no such assignment shall limit or otherwise affect
Buyer's obligations hereunder), (ii) Buyer may collaterally assign its rights
under this agreement as security for its obligations to any third party
providing financing in connection with the transactions contemplated hereby and
(iii) after Closing, Buyer may assign its rights under this Agreement to any
person who, directly or indirectly, acquires 50% or more of the capital stock of
Buyer (by merger, sale of stock or otherwise) or the Interests or acquires all
or any substantial portion of the assets of UDLP (it being understood that if
more than 10% of such person's annual revenues for the latest fiscal year ended
prior to such acquisition were derived from the defense business, then all of
the representations and warranties contained in this Agreement and the Ancillary
Agreements (other than any representation and warranty contained in Sections
4C(k),

                                      -60-
<PAGE>
 
4C(l), 4C(n) and 8(f) of this Agreement) shall immediately terminate as of the
date of such acquisition).

          13.  No Third-Party Beneficiaries.  This Agreement is for the sole
benefit of the parties hereto and their permitted assigns and nothing herein
express or implied (including Sections 8(f), 8(h) and 11) shall give or be
construed to give to any person or entity, other than the parties hereto and
such permitted assigns, any legal or equitable rights hereunder.

          14.  Termination.

          (a) Anything contained herein to the contrary notwithstanding, this
Agreement may be terminated and the transactions contemplated hereby abandoned
at any time prior to the Closing Date:

          (i) by the mutual written consent of Sellers and Buyer;

          (ii) by either Seller if any of the conditions set forth in Section
     3(b) shall have become incapable of fulfillment, and shall not have been
     waived by Seller;

          (iii) by Buyer if any of the conditions set forth in Section 3(a)
     shall have become incapable of fulfillment, and shall not have been waived
     by Buyer; or

          (iv) by either Seller if the Closing does not occur on or prior to
     November 25, 1997; or

          (v) by Buyer if the Closing does not occur on or prior to November 25,
     1997; provided, however, that the party seeking termination pursuant to
     clause (ii), (iii), (iv) or (v) above is not in breach of any of its
     representations, warranties, covenants or agreements contained in this
     Agreement.

          (b) In the event of termination by Sellers or Buyer pursuant to this
Section 14, written notice thereof shall forthwith be given to the other party
and the transactions contemplated by this Agreement shall be terminated, without
further action by any party.  If the transactions contemplated by this Agreement
are terminated as provided herein:

          (i) Buyer shall return all documents and copies and other materials
     received from or on behalf of each Seller relating to the transactions
     contemplated hereby, whether so obtained before or after the execution
     hereof, to such Seller or shall destroy all such documents, copies and
     materials and provide written certification of such destruction to such
     Seller; and

          (ii) all confidential information received by Buyer with respect to
     UDLP, the Subsidiaries, the Foreign Affiliates and the Business shall be
     treated in accordance with the

                                      -61-
<PAGE>
 
     Diligence Confidentiality Agreement, which shall remain in full force and
     effect notwithstanding the termination of this Agreement.

          (c) If this Agreement is terminated and the transactions contemplated
hereby are abandoned as described in this Section 14, this Agreement shall
become void and of no further force and effect, except for the provisions of (i)
Section 5(a) relating to indemnification in connection with access to the
Property, (ii) Section 7(a) relating to the obligation of Buyer to keep
confidential certain information and data obtained by it, (iii) Section 8(b)
relating to publicity, (iv) Section 16 relating to certain expenses, (v) Section
23 relating to finder's fees and broker's fees, and (vi) this Section 14.
Nothing in this Section 14 shall be deemed to release any party from any
liability for any breach by such party of the terms and provisions of this
Agreement or to impair the right of any party to compel specific performance by
another party of its obligations under this Agreement.

          15.  Survival of Representations.  The representations and warranties
in this Agreement and in any other document delivered in connection herewith
shall survive the Closing solely for purposes of Sections 11(a) and 11(c) and
shall terminate at the close of business on April 30, 1999; provided, however,
that (i) the representations and warranties set forth in Section 4C(l) and
Section 4C(k) (to the extent relating to the applicable statutes) shall survive
the Closing until 90 days after the expiration of the applicable statute of
limitations and (ii) the representations and warranties set forth in Sections
4A, 4B, 4C(a)(i) and 4C(b) shall survive the Closing without limitation.

          16.  Expenses.  Whether or not the transactions contemplated hereby
are consummated, and except as otherwise specifically provided in this
Agreement, all costs and expenses incurred in connection with this Agreement and
the transactions contemplated hereby shall be paid by the party incurring such
costs or expenses.

          17.  Amendment and Waiver.  This Agreement may be amended, or any
provision of this Agreement may be waived; provided, however, that any such
amendment or waiver shall be binding upon a Seller only if set forth in a
writing executed by such Seller and referring specifically to the provision
alleged to have been amended or waived, and any such amendment or waiver shall
be binding upon Buyer only if set forth in a writing executed by Buyer and
referring specifically to the provision alleged to have been amended or waived.
No course of dealing between or among any persons having any interest in this
Agreement shall be deemed effective to modify, amend or discharge any part of
this Agreement or any rights or obligations of any person under or by reason of
this Agreement.

          18.  Notices.  All notices or other communications required or 
permitted to be given hereunder shall be in writing and shall be delivered by
hand or sent by prepaid telex, cable or telecopy, or sent, postage prepaid, by
registered, certified or express mail, or reputable overnight courier service
and shall be deemed given when so delivered by hand, telexed, cabled or
telecopied, or if mailed, three days after mailing (one business day in the case
of express mail or overnight courier service), as follows:

                                      -62-
<PAGE>

          (i)    if to Buyer,

                 Iron Horse Acquisition Corp.
                 c/o TC Group, L.L.C.
                 1001 Pennsylvania Avenue, N.W.
                 Suite 220 South
                 Washington, D.C. 20004
                 Telecopy No.:  202-347-9250
                 Attention:  Allan M. Holt

                 with a copy to:

                 Latham & Watkins
                 1001 Pennsylvania Avenue, N.W.
                 Suite 1300
                 Washington, D.C. 20004
                 Telecopy No.:  202-637-2201
                 Attention:  Bruce E. Rosenblum

          (ii)   if to FMC,

                 FMC Corporation
                 200 East Randolph Drive
                 Chicago, Illinois  60601
                 Telecopy No.:  (312) 861-6012
                 Attention:  J. Paul McGrath

                 with a copy to:

                 Kirkland & Ellis
                 200 East Randolph Drive
                 Chicago, Illinois  60601
                 Telecopy No.:  (312) 861-2200
                 Attention:  Glen E. Hess, P.C.


          (iii)  if to Harsco,

                 Harsco Corporation
                 350 Poplar Church Road
                 Camp Hill, PA  17011
                 Telecopy No.:  (717) 763-6402
                 Attention:  Paul C. Coppock

                                      -63-
<PAGE>
 
                 with a copy to:

                 Morgan, Lewis & Bockius
                 1800 M Street, N.W.
                 Washington, D.C. 20036
                 Telecopy No.: (202) 467-7176
                 Attention:  Lloyd H. Feller

          19.  Interpretation. The headings and captions contained in this
Agreement, in any Exhibit or Schedule hereto and in the table of contents to
this Agreement are for reference purposes only and shall not affect in any way
the meaning or interpretation of this Agreement. Any capitalized terms used in
any Schedule or Exhibit and not otherwise defined therein shall have the
meanings set forth in this Agreement. The use of the word "including" herein
shall mean "including without limitation."

          20.  No Strict Construction. Notwithstanding the fact that this
Agreement has been drafted or prepared by one of the parties, each of Buyer and
Sellers confirms that each of them and their respective counsel have reviewed,
negotiated and adopted this Agreement as the joint agreement and understanding
of the parties, and the language used in this Agreement shall be deemed to be
the language chosen by the parties hereto to express their mutual intent, and no
rule of strict construction shall be applied against any person.

          21.  Counterparts. This Agreement may be executed in one or more
counterparts (including by means of telecopied signature pages), all of which
shall be considered one and the same agreement, and shall become effective when
one or more such counterparts have been signed by each of the parties and
delivered to the other party.

          22.  Entire Agreement. This Agreement and the other agreements
referred to herein (including the Diligence Confidentiality Agreement) or
executed among all of the parties in connection herewith contain the entire
agreement and understanding between the parties hereto with respect to the
subject matter hereof and supersede all prior agreements and understandings,
whether written or oral, relating to such subject matter.

          23.  Brokerage. Buyer has not used a broker or finder in connection
with the transactions contemplated by this Agreement, and there are no claims
for brokerage commissions, finders' fees or similar compensation in connection
with the transactions contemplated by this Agreement based on any arrangement or
agreement by or on behalf of Buyer, except pursuant to an arrangement with
Lehman Brothers, Inc. for which Buyer is solely responsible. No Seller has
retained any broker or finder or incurred any liability or obligation for any
brokerage fees, commissions or finder's fees with respect to this Agreement or
the transactions contemplated hereby, except pursuant to arrangements with
Morgan Stanley & Co. Incorporated (for which FMC is responsible) and Salomon
Brothers Inc (for which Harsco is responsible). Notwithstanding anything to the
contrary in Section 11, Buyer shall indemnify and hold Sellers harmless for any
breach of its

                                     -64-
<PAGE>
 
representation in this Section 23, and Sellers shall indemnify and hold Buyer
harmless for any breach of their representation in this Section 23.

          24.  Schedules. The Schedules hereto are qualified in their entirety
by reference to the specific provisions of the Agreement and are not intended to
constitute, and shall not be construed as constituting, representations or
warranties of Sellers, except as and to the extent provided in the Agreement.
Inclusion of information in the Schedules hereto shall not be construed as an
admission that such information is material to any of Sellers, the Interests,
the Business and/or UDLP or its Subsidiaries or Foreign Affiliates. Matters
reflected in the following Schedules are not necessarily limited to matters
required by the Agreement to be reflected in the Schedules. Such additional
matters are set forth for informational purposes only and do not necessarily
include other matters of a similar nature. Prior to the Closing, Sellers shall
have the right to supplement, modify or update the Schedules hereto to reflect
changes occurring between the date of this Agreement and the Closing; provided,
however, that any such supplements, modifications or updates shall be subject to
Buyer's rights under Section 3(a)(i). Matters disclosed in any Schedule shall be
deemed to be disclosed in all Schedules in which such matters are appropriate to
be disclosed. Headings have been inserted on Sections of the Schedules for
convenience of reference only and shall to no extent have the effect of amending
or changing the express description of the Sections as set forth in the
Agreement.

          25.  Representation by Counsel; Interpretation. Sellers and Buyer
acknowledge that each of them has been represented by counsel in connection with
this Agreement and the transactions contemplated hereby. Accordingly, any rule
of law or any legal decision that would require interpretation of any claimed
ambiguities in this Agreement against the party that drafted it has no
application and is expressly waived.

          26.  Severability. Whenever possible, each provision of this Agreement
shall be interpreted in such manner as to be valid and effective under
applicable law, but if any provision of this Agreement or the application of any
such provision to any person or circumstance shall be held invalid, illegal or
unenforceable in any respect by a court of competent jurisdiction, such
invalidity, illegality or unenforceability shall not affect any other provision
hereof.

          27.  Governing Law. This Agreement shall be governed by and construed
in accordance with the internal laws of the State of Illinois applicable to
agreements made and to be performed entirely within such State, without regard
to the conflicts of law principles of such State, except to the extent otherwise
provided on Schedule 29(b) hereto.

          28.  Exhibits and Schedules. All Exhibits and Schedules annexed hereto
or referred to herein are hereby incorporated in and made a part of this
Agreement as if set forth in full herein.

          29.  Dispute Resolution.

                                     -65-
<PAGE>
 
          (a)  Negotiation. In the event of any dispute or disagreement between
Sellers and Buyer as to the interpretation of any provision of this Agreement or
any Ancillary Agreement (or the performance of obligations hereunder or
thereunder), the matter, upon written request of any Seller or Buyer, shall be
referred to representatives of the parties for decision, each party being
represented by a senior executive officer (the "Representatives"). The
Representatives shall promptly meet in a good faith effort to resolve the
dispute. If the Representatives do not agree upon a decision within thirty (30)
calendar days after reference of the matter to them, each of Buyer and Sellers
shall be free to exercise the remedies available to them under Section 29(b).

          (b)  Arbitration. Any controversy, dispute or claim arising out of or
relating in any way to this Agreement or the Ancillary Agreements or the
transactions arising hereunder or thereunder that cannot be resolved by
negotiation pursuant to Section 29(a), including any controversy, dispute or
claim relating to any alleged breach or violation hereof or thereof by a party
hereto, or the scope, interpretation, validity or termination hereof or thereof,
shall, except as otherwise provided in Section 2(b), be settled exclusively by
arbitration in accordance with and subject to the principles and provisions set
forth on Schedule 29(b) attached hereto.

                             *    *    *    *    *

                                     -66-
<PAGE>
 
          IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed as of the date first written above.

                                        FMC CORPORATION
 
                                        By:  /s/ J. Paul McGrath
                                             ----------------------------------
                                             Name:  J. Paul McGrath
                                                    ---------------------------
                                             Title: Senior Vice President
                                                    ---------------------------

                                        HARSCO CORPORATION
 
                                        By:  /s/ Leonard A. Campanaro
                                             ----------------------------------
                                             Name:   Leonard A. Campanaro
                                                     --------------------------
                                             Title:  Sr. Vice President & CFO
                                                     --------------------------


                                        HARSCO UDLP CORPORATION
 
                                        By:  /s/ Leonard A. Campanaro
                                             ----------------------------------
                                             Name:   Leonard A. Campanaro
                                                     -------------------------- 
                                             Title:  Treasurer
                                                     --------------------------
 
 
                                        IRON HORSE ACQUISITION CORP.
 
                                        By:  /s/ Allan M. Holt
                                             ----------------------------------
                                             Name:   Allan M. Holt
                                                     --------------------------
                                             Title:  President
                                                     --------------------------
                                     -67-
<PAGE>
 
                               LIST OF EXHIBITS
                               ----------------
 
Exhibit 2(a)(i)        -     Form of Opinion of Buyer's Counsel
Exhibit 2(a)(ii)       -     Form of Opinion of Each Seller's Counsel
Exhibit 6(c)           -     Escrow Agreement
Exhibit 8(k)           -     Transition Services Agreement
Exhibit 8(l)           -     Technology and Environmental Services Agreement
Exhibit 8(m)           -     Lease
Exhibit 8(n)-1         -     FMC Intellectual Property Agreement
Exhibit 8(n)-2         -     Harsco Intellectual Property Agreement
Exhibit 10(m)          -     Foreign Affiliates' June 30, 1997 Balance Sheets

                                      -68-
<PAGE>
 
                               LIST OF SCHEDULES
                               -----------------
 
 
Schedule 2(b)        -   Adjustment Principles
Schedule 3(a)(v)     -   Material Adverse Changes
Schedule 4C(a)(ii)   -   Certain Conflicts
Schedule 4C(b)       -   Purchase Rights
Schedule 4C(c)-1     -   Subsidiaries
Schedule 4C(c)-2     -   Foreign Affiliates
Schedule 4C(d)       -   Financial Statements
Schedule 4C(e)       -   Permitted Liens
Schedule 4C(f)-1     -   Owned Real Property
Schedule 4C(f)-2     -   Leased Real Property
Schedule 4C(g)       -   Intellectual Property and Intellectual Property 
                           Exceptions
Schedule 4C(h)       -   Material Contracts
Schedule 4C(i)       -   Litigation
Schedule 4C(j)       -   Compliance with Laws
Schedule 4C(k)       -   ERISA Exceptions
Schedule 4C(k)-1     -   UDLP Employee Benefit Plans
Schedule 4C(k)-2     -   FMC Employee Benefit Plans
Schedule 4C(l)       -   Taxes
Schedule 4C(m)       -   Insurance Policies
Schedule 4C(n)       -   Environmental Compliance
Schedule 4C(o)       -   Undisclosed Liabilities
Schedule 4C(p)       -   Subsequent Events
Schedule 4C(q)       -   Government Contracts
Schedule 4C(r)       -   Labor Relations
Schedule 4C(u)-1     -   Loss Contracts
Schedule 4C(u)-2     -   Backlog
Schedule 4C(v)       -   Customers, Distributors and Suppliers
Schedule 4C(w)       -   Dividends by Foreign Affiliates
Schedule 5(b)        -   Permitted Conduct
Schedule 5(e)        -   Employees Not To Be Solicited
Schedule 5(g)        -   FMC Resource Transfer
Schedule 6(c)        -   Commitment Letters
Schedule 7(e)        -   Guaranties
Schedule 7(f)        -   Retained Assets and Liabilities
Schedule 8(f)(ii)    -   Remediation Reports
Schedule 8(h)(i)     -   Transferred Employees
Schedule 8(h)(iii)   -   Actuarial Assumptions and Methods
Schedule 8(h)(v)     -   UDLP Severance Plan
Schedule 8(h)(xii)   -   Incentive Payments and Severance Payments
Schedule 29(b)       -   Arbitration Principles

                                     -69-

<PAGE>
                                                                    EXHIBIT 10.1

 
               SUPPLEMENTAL AGREEMENT NO.1 TO PURCHASE AGREEMENT
               -------------------------------------------------

     THIS SUPPLEMENTAL AGREEMENT NO. 1 TO PURCHASE AGREEMENT (this "Agreement"),
dated as of August 25, 1997, is entered into by and among FMC Corporation, a
Delaware corporation, Harsco Corporation, a Delaware corporation, Harsco UDLP
Corporation, a Pennsylvania business corporation (together with FMC Corporation
and Harsco Corporation, "Sellers"), and Iron Horse Acquisition Corp., a Delaware
corporation ("Buyer"). Capitalized terms used and not otherwise defined in
Section 6 below or otherwise herein have the meaning ascribed to such terms in
the Purchase Agreement (as defined below).

     WHEREAS, Sellers and Buyer are parties to a Purchase Agreement (the
"Purchase Agreement"), dated as of the date hereof;

     * * */1/

     WHEREAS, Sellers and Buyer intend this Agreement to supplement and modify
the terms of the Purchase Agreement.

     NOW, THEREFORE, in consideration of the mutual covenants contained herein
and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the parties to this Agreement hereby agree as follows:

     1.  Modification of the Initial Purchase Price.  Pursuant to Section 1(b)
of the Purchase Agreement, the Initial Purchase Price is $850,000,000 payable in
immediately available funds at the Closing.  Notwithstanding the terms of
Section 1(b) of the Purchase Agreement, and any other provision of the Purchase
Agreement to the contrary, Sellers and Buyer hereby agree that unless * * * the
Initial Purchase Price shall be modified to consist of (i) $800,000,000 payable
in immediately available funds at the Closing and (ii) a note in the aggregate
principal amount of $50,000,000, in form and substance reasonably satisfactory
to Sellers and Buyer, containing the terms and conditions specified on Exhibit A
hereto (the "Special Note") deliverable to Sellers at the Closing.

     2.  Mandatory Prepayment of Special Note.  Upon the first to occur of any
of the following events, the aggregate principal amount outstanding under the
Special Note and all accrued and unpaid interest thereon will become immediately
due and payable, subject to the rights of set-off in Section 3:

     (a)  * * *

- --------------------------
/1/ Omitted text indicated herein by three asterisks (* * *) is the subject of a
Confidential Treatment Request filed with the Securities and Exchange Commission
(the "Commission"). The text for which confidential treatment has been requested
has been filed separately with the Commission.
<PAGE>
 
          (b)  the consummation of an initial public offering of shares of
     common equity interests or other securities equivalent thereto of UDLP;

          (c)  the consummation of (i) the sale of UDLP to one or more parties
     pursuant to which such party or parties acquire greater than 50% of the
     equity interests, capital stock or other securities of UDLP (whether by
     merger, consolidation, sale or transfer of equity interests, capital stock
     or other securities or otherwise) or (ii) the sale of all or substantially
     all of UDLP's assets, in either case whether in one transaction or a series
     of related transactions;

          (d)  * * *

          (e)  * * *

          (f)  * * *

          3.   Right of Set-Off. Upon the maturity of the Special Note, whether
at scheduled maturity or pursuant to the mandatory prepayment provisions of
Section 2 or pursuant to acceleration (the "Set-Off Date"), Buyer shall have the
right to assert a set-off against any and all amounts due under the Special Note
the amount of any Loss that Buyer shall have incurred as a result of a Loss
Event. If Buyer desires to assert such a Loss, Buyer shall provide to Sellers
(as soon as possible, and in any event within 30 days after the Set-Off Date in
the case of a mandatory prepayment of the Special Note or acceleration and on or
before the Set-Off Date in the case of scheduled maturity) a written statement
(a "Set-Off Statement") setting forth in reasonable detail the amount of any
asserted Loss, the basis of Buyer's asserted right to set-off of any such Loss
and a detailed statement of how any such Loss is a result of a Loss Event.
Sellers may contest the amount or validity and propriety of any item of Loss set
forth on the Set-Off Statement by giving written notice thereof to Buyer within
60 days after receipt of the Set-Off Statement. No amount of Loss specified on
any Set-Off Statement shall be valid or proper unless it is set forth in
reasonable detail on such Set-Off Statement, and the amount of any Loss on any
such Set-Off Statement not contested by Sellers in such a written notice of
Sellers shall be conclusively deemed to be valid and proper. The amount of any
Loss specified in a Set-Off Statement which is so contested shall be resolved
pursuant to the arbitration provisions set forth on Schedule 29(b) of the
Purchase Agreement. * * * Interest shall continue to accrue on the principal
amount of the Special Note which was not paid based on any Loss specified in a
Set-Off Statement which is subject to arbitration as provided above and shall be
payable to Sellers if and when such amount is determined to have not been
properly set-off but shall not be payable with respect to any such amount which
is determined to have been properly set-off.

          4.   Limitations on Right of Set-Off. Notwithstanding anything to the
contrary in Section 3 above, the right of Buyer to a set-off as specified in
Section 3 above is subject to the following limitations. If there has occurred 
* * * and subsequently, in any final and non-appealable adjudication, it is
determined by a court, agency or other tribunal of competent jurisdiction that 
* * * was impermissible, wrongful, unlawful or otherwise improper, then the
amount of Loss set-off in connection with the applicable Set-Off Statement shall
be redetermined by the arbitrators pursuant to the arbitration provisions set
forth on Schedule 29(b) of the Purchase Agreement and any reduction shall be
paid (with accrued interest thereon) to Sellers.

                                      -2-
<PAGE>
 
          5.   Covenants.
               --------- 

          (a)  In anticipation of or in the event of a Loss Event, Sellers shall
     have the right to participate in any and all negotiations, discussions,
     meetings and other communications relating to the Loss Event or potential
     Loss Event, as applicable, and shall have the right to approve of any and
     all settlements, agreements or other arrangements made in connection
     therewith (such approval not to be unreasonably withheld or delayed).

          (b)  In anticipation of or in the event of a Loss Event, subject to
     Seller's rights pursuant to clause (a) above, Buyer shall and shall cause
     its Affiliates to use all commercially reasonable efforts to (a) obtain 
     * * * in the most cost-effective and expeditious manner practicable
     (provided that the costs thereof to UDLP or Buyer shall constitute a loss
     subject to rights of set-off) and (b) otherwise act in good faith to
     minimize any Loss in respect of any such Loss Event.

          (c)  * * *

          (d)  Buyer shall deliver to Sellers at Buyer's sole cost and expense
     (so long as Sellers hold any portion of the outstanding principal amount of
     the Special Note or so long as any arbitration proceeding contemplated by
     Section 3 above is not finally resolved, whichever is later, and in the
     form regularly prepared in the ordinary course):

          * * *

          (e)  So long as Sellers hold any portion of the outstanding principal
     amount of the Special Note or so long as any arbitration proceeding
     contemplated by Section 3 above is not finally resolved, whichever is
     later, * * *.

          6.   Definitions.  As used in this Agreement (including the Exhibits
               -----------                                                    
hereto), the following definitions shall apply:

          "Adverse Legal Consequences" shall mean Losses to Buyer or UDLP, under
           --------------------------                                           
* * *.

          * * *

          "UDLP" means United Defense, L.P. and its successors.
           ----                                                

          7.   Amendment and Waiver.  No modification, amendment or waiver of
any provision of this Agreement shall be effective against any party hereto
unless such modification, amendment or waiver is approved in writing by such
party.  The failure of any party hereto to enforce any of the provisions of this
Agreement shall in no way be construed as a waiver of such provisions and shall
not affect the right of such party thereafter to enforce each and every
provision of this Agreement in accordance with its terms.

          8.   Severability.  Whenever possible, each provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of

                                      -3-
<PAGE>
 
this Agreement is held to be invalid, illegal or unenforceable in any respect
under any applicable law or rule in any jurisdiction, such invalidity,
illegality or unenforceability shall not affect the validity, legality or
enforceability of any other provision of this Agreement in such jurisdiction or
affect the validity, legality or enforceability of any provision in any other
jurisdiction, but this Agreement shall be reformed, construed and enforced in
such jurisdiction as if such invalid, illegal or unenforceable provision had
never been contained herein.

          9.   Entire Agreement. Except as otherwise expressly set forth herein,
this Agreement embodies the complete agreement and understanding among the
parties hereto with respect to the subject matter hereof and supersedes and
preempts any prior understandings, agreements or representations by or among the
parties, written or oral, which may have related to the subject matter hereof in
any way.

          10.  Successors and Assigns. Except as otherwise provided herein, this
Agreement shall bind and inure to the benefit of and be enforceable the
respective successors and assigns of each of the parties hereto.

          11.  Counterparts. This Agreement may be executed in multiple
counterparts (including by means of telecopied signature pages), each of which
shall be an original and all of which taken together shall constitute one and
the same agreement.

          12.  Notices. Any notice provided for in this Agreement shall be in
writing and shall be either personally delivered, or mailed first class mail
(postage prepaid) or sent by reputable overnight courier service (charges
prepaid) to any party hereto at the address indicated in the Purchase Agreement,
or at such address or to the attention of such other person as the recipient
party has specified by prior written notice to the sending party. Notices shall
be deemed to have been given hereunder when delivered personally, three days
after deposit in the U.S. mail and one day after deposit with a reputable
overnight courier service.

          13.  Governing Law. This Agreement shall be governed by and construed
in accordance with the internal laws of the State of Illinois, without giving
effect to any choice of law or conflict of law rules or provisions (whether of
the State of Illinois or any other jurisdiction) that would cause the
application of the laws of any jurisdiction other than the State of Illinois.

          14.  Descriptive Headings; Interpretation. The descriptive headings
and captions of this Agreement are inserted for convenience only and do not
constitute a part of this Agreement. The use of the word "including" herein
shall mean "including without limitation."

          15.  Sole Remedy. The rights of set-off as provided in this Agreement
shall be the exclusive right and remedy of Buyer for any alleged Loss resulting
from any Loss Event (it being understood, however, that Buyer shall only be
entitled to a set-off under the circumstances, in the events contemplated by and
pursuant to the provisions of Sections 3 and 4 above). Other than as set

                                      -4-
<PAGE>
 
forth in this Agreement, Sellers shall have no liability whatsoever for any
amount claimed to be set-off pursuant to the terms of this Agreement or in
excess of the amount, if any, available to be set-off hereunder from time to
time.


                            *    *    *     *    *

                                      -5-
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have entered into this
Agreement as of the date first written above.

                                    FMC CORPORATION

                                    By:    /s/ J. Paul McGrath
                                         -----------------------------------

                                    Its:  Senior Vice President
                                        ------------------------------------


                                    HARSCO CORPORATION

                                    By:  /s/ Leonard A. Campanaro
                                       -------------------------------------

                                    Its:   Senior Vice President and C.F.O.
                                        ------------------------------------


                                    HARSCO UDLP CORPORATION

                                    By:   /s/ Leonard A. Campanaro
                                       -------------------------------------

                                    Its:   Treasurer
                                        ------------------------------------


                                    IRON HORSE ACQUISITION CORP.

                                    By:   /s/ Allan M. Holt
                                       -------------------------------------

                                    Its:   President
                                        ------------------------------------

<PAGE>
 
                    EXHIBIT A -- TERMS OF THE SPECIAL NOTE
                    --------------------------------------

Borrower:                The entity that issues the Senior Debt and Senior
- --------                 Notes.
                    

Principal Amount:        $50,000,000
- ----------------                         

Maturity:                The final maturity of the Special Note shall be 3 years
- --------                 from the Closing Date.
                    

Ranking:                 The payment of principal of, premium, if any, and
- -------                  interest on the Special Note will be subordinate and
                         subject in right of payment to all existing and future
                         Senior Indebtedness (to be defined) and pari passu in
                         right of payment with all other senior subordinated or
                         subordinated indebtedness of Borrower. Initially Senior
                         Indebtedness will consist principally of Borrower's
                         bank facility and subordinated indebtedness will
                         consist principally of $225 million of senior
                         subordinated notes (the "Senior Notes"), and the
                         parties will agree to appropriate protections to
                         preserve equivalent type of ranking in connection with
                         future debt incurrences.

Guaranties:              Each person who guarantees Borrower's Senior Notes
- ----------               (each a "Guarantor" and, collectively, the
                         "Guarantors") shall be required to provide a guaranty
                         of all amounts owing under the Special Note (the
                         "Guaranties"), equivalent in ranking and terms to the
                         Guarantees of the Sub Debt.

Interest Rates:          Outstanding principal on the Special Note shall bear
- --------------           interest at the same rate per annum as the Senior
                         Notes, and shall be payable quarterly in arrears on the
                         last business day of each calendar quarter. Interest
                         will also be payable at the time of repayment of the
                         Special Note and at maturity.

Covenants:               The Special Note will have substantially the same
- ---------                covenants and default provisions as the Senior Notes;
                         provided, however, that the maturity of the Special
                         Note may be accelerated only in the event of
                         acceleration of the Senior Debt and the Senior Notes.

Subordination:           As required by senior lenders (equivalent to the Senior
- -------------            Notes).


                                      -7-

<PAGE>

                                                                    EXHIBIT 10.2
 
                     ALLOCATION AND CONTRIBUTION AGREEMENT


          This ALLOCATION AND CONTRIBUTION AGREEMENT (this "Agreement") is
entered into as of August 25, 1997, by and among FMC Corporation ("FMC") and
Harsco Corporation and Harsco UDLP Corporation (collectively, the "Harsco
Indemnitors"). FMC and the Harsco Indemnitors are hereafter sometimes
collectively referred to as the "Indemnitors", and each individually as an
"Indemnitor," and FMC and the Harsco Indemnitors (collectively as one party) are
each referred to herein as a "Party". Capitalized terms used herein but not
defined herein shall have the respective meanings given to such terms in the
Purchase Agreement (defined below).

          WHEREAS, FMC is the sole owner and holder of 100% of the outstanding
general partnership interests of United Defense, L.P., a Delaware limited
partnership ("UDLP") and Harsco UDLP Corporation is the sole owner and holder of
100% of the outstanding limited partnership interests of UDLP;

          WHEREAS, as the general partner of UDLP, FMC has had the principal
responsibility for the management and operation of UDLP;

          WHEREAS, the Indemnitors have determined that it is in their
respective best interests, and in the best interests of UDLP, to sell the
general partnership and limited partnership interests together and to give joint
and several representations, warranties and covenants to the buyer of such
interests in connection therewith;

          WHEREAS, contemporaneously herewith the Indemnitors are entering into
a Purchase Agreement (the "Purchase Agreement") dated as of August 25, 1997 with
Iron Horse Acquisition Corp. (the "Buyer") pursuant to which the Buyer is
agreeing to acquire all of the partnership interests in UDLP;

          WHEREAS, pursuant to certain provisions of the Purchase Agreement, the
Indemnitors are required to make certain payments to the Buyer and/or UDLP and
the Indemnitors have agreed, subject to the terms and conditions set forth
therein, to jointly and severally indemnify, defend and hold the Buyer
Indemnitees harmless from and in respect of certain Losses;

          WHEREAS, to induce each Party to enter into the Purchase Agreement and
to consummate the transactions contemplated thereby, the other Party is making
herein certain representations, warranties and covenants, on which the Party
benefitting from such representations, warranties and covenants is and will be
relying in entering into the Purchase Agreement and consummating the
transactions contemplated thereby;

          WHEREAS, without limiting the generality of the foregoing recital, the
Harsco Indemnitors are joining with FMC in certain joint and several
representations, warranties and
<PAGE>
 
covenants in the Purchase Agreement and the other Ancillary Agreements in
reliance on the representations, warranties and covenants of FMC contained in
this Agreement;

          WHEREAS, pursuant to certain provisions of the Purchase Agreement, the
Indemnitors make certain representations, warranties and covenants to the Buyer,
and the Indemnitors have agreed, subject to the terms and conditions set forth
therein, to indemnify, defend and hold the Buyer Indemnitees (as defined below)
harmless from and in respect of certain Losses;

          WHEREAS, pursuant to certain provisions of the Purchase Agreement,
Buyer and/or UDLP is required to make certain payments to Sellers, and Buyer has
agreed, subject to the terms and conditions set forth therein, to indemnify,
defend and hold the Seller Indemnitees (as defined below) harmless from and in
respect of certain Losses; and

          WHEREAS, in connection with the sale of UDLP pursuant to the Purchase
Agreement and the consequent termination of their relationship as partners of
UDLP, the Indemnitors wish to make certain agreements among themselves relating
to the past conduct of UDLP's business.

          NOW, THEREFORE, in consideration of the foregoing premises and the
mutual promises made herein and for other good and valuable consideration the
receipt and sufficiency of which is hereby acknowledged, and intending to be
legally bound hereby, the Indemnitors agree as follows:

1.   Certain Definitions.

          "Buyer Indemnitees" shall mean the Buyer Indemnified Parties.

          "FMC Covenants" means the covenants contained in the following
Sections of the Purchase Agreement: Section 2(b)(iv), Section 5 (but excluding
Sections 5(c), 5(e), 5(f) and 5(j)), Sections 8(a), 8(d), 8(e), 8(h), 10(d),
10(i)(i), 10(j) and, except to the extent that the context otherwise clearly
requires and except to the extent that the performance of such covenant is
peculiarly within the control of Harsco (as opposed to FMC), all other covenants
in the Purchase Agreement (other than the Several Covenants) that make reference
to Sellers or a Seller but which do not identify either FMC or Harsco by name.

          "FMC Representations" means (i) all representations and warranties
relating to FMC's Corporate Technology Center ("CTC") and (ii) the
representations and warranties contained in Sections 4A and 23 (as it relates to
FMC and its affiliates) and all other representations of a Seller in the
Purchase Agreement (other than the Shared Representations) that make reference
to Sellers or a Seller but which do not identify either FMC or Harsco by name.

          "Harsco Representations" means the representations and warranties
contained in Sections 4B and 23 (as it relates to Harsco and its affiliates).

                                      -2-
<PAGE>
 
          "Pro Rata Portion" means 60% in the case of FMC and 40% in the case of
the Harsco Indemnitors.

          "Seller Indemnitees" shall mean each Indemnitor, each of its
Affiliates and each of their respective officers, directors and employees.

          "Several Covenants" means the covenants contained in the following
Sections of the Purchase Agreement: Sections 1(b), 1(c), 2(a), 2(b)(ii), 5(c),
5(e), 5(f), 5(j), 7(f), 8(b), 8(c), 8(f)(iii), 8(g)(ii), 8(i), 8(n), 8(p), 9,
10(a), 10(b), 10(e), 10(f), 10(h), 10(j)(ii), 10(k) (to the extent required in
the case of Harsco), 12, 16 and 29.

          "Shared Representations" means the representations and warranties
contained in Section 4C(a)(i), 4C(b), 4C(d) (excluding those relating to the
Latest Financials), 4C(e), 4C(f), 4C(g), 4C(l) and 4C(n) (excluding those
matters subject to Section 8(f) of the Purchase Agreement) of the Purchase
Agreement.

     2.   Representations and Warranties of the Harsco Indemnitors. Each of the
Harsco Indemnitors jointly and severally represents and warrants to FMC as of
the date of this Agreement as follows:

          2.1  Authorization. This Agreement constitutes the valid and legally
binding obligation of such Harsco Indemnitor, enforceable against such Harsco
Indemnitor in accordance with its terms and conditions, except as may be limited
by (a) applicable bankruptcy, reorganization, insolvency, moratorium or other
similar laws affecting the enforcement of creditors' rights generally from time
to time in effect and (b) the effect of general principles of equity (regardless
of whether such enforceability is considered in a proceeding in equity or at
law).

          2.2  Non-contravention. Neither the execution and the delivery of this
Agreement by such Harsco Indemnitor, nor the performance by such Harsco
Indemnitor of its obligations hereunder, will (i) violate any constitution,
statute, regulation, rule, injunction, judgment, order, decree, ruling, charge
or other restriction of any government, governmental agency or court to which
the Harsco Indemnitor is subject or any provision of its organizational
documents or (ii) conflict with, result in a breach of, constitute a default
under, result in the acceleration of, or create in any party the right to
accelerate, terminate, modify, cancel or require any notice under any agreement,
contract, lease, license, instrument or other arrangement to which the Harsco
Indemnitor is a party or by which such Harsco Indemnitor is bound or to which
any of such Harsco Indemnitor's assets are subject except for such conflicts,
breaches, defaults, or rights that would not, individually or in the aggregate,
be reasonably likely to have a material adverse effect upon the financial
condition of such Harsco Indemnitor.

          2.3  Consents. No consent, authorization, approval, permit or license
of, or filing with, any governmental or public body or authority, any lender or
lessor or any other person or entity is required to be obtained or made by any
Harsco Indemnitor to authorize, or is required to be obtained or made by any
Harsco Indemnitor in connection with, the execution, delivery and

                                      -3-
<PAGE>
 
performance of this Agreement or the agreements contemplated hereby on the part
of such Harsco Indemnitor (other than those that have been obtained or made).

     3.   Representations and Warranties of FMC. FMC represents and warrants to
the Harsco Indemnitors as of the date of this Agreement as follows:

          3.1  Authorization. This Agreement constitutes the valid and legally
binding obligation of FMC, enforceable against FMC in accordance with its terms
and conditions, except as may be limited by (a) applicable bankruptcy,
reorganization, insolvency, moratorium or other similar laws affecting the
enforcement of creditors' rights generally from time to time in effect and (b)
the effect of general principles of equity (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

          3.2  Non-contravention. Neither the execution and the delivery of this
Agreement by FMC, nor the performance by FMC of its obligations hereunder, will
(i) violate any constitution, statute, regulation, rule, injunction, judgment,
order, decree, ruling, charge or other restriction of any government,
governmental agency or court to which FMC is subject or any provision of its
organizational documents or (ii) conflict with, result in a breach of,
constitute a default under, result in the acceleration of, or create in any
party the right to accelerate, terminate, modify, cancel or require any notice
under any agreement, contract, lease, license, instrument or other arrangement
to which FMC is a party or by which FMC is bound or to which any of FMC's assets
are subject except for such conflicts, breaches, defaults, or rights that would
not, individually or in the aggregate, be reasonably likely to have a material
adverse effect upon the financial condition of FMC.

          3.3  Consents. No consent, authorization, approval, permit or license
of, or filing with, any governmental or public body or authority, any lender or
lessor or any other person or entity is required to be obtained or made by FMC
to authorize, or is required to be obtained or made by FMC in connection with,
the execution, delivery and performance of this Agreement or the agreements
contemplated hereby on the part of FMC (other than those that have been obtained
or made).

          3.4  Purchase Agreement. FMC has provided to the Harsco Indemnitors
all agreements and understandings between or among the Buyer and FMC and UDLP
relating to the sale of UDLP.

          3.5  Representations and Warranties Relating to the Purchase
Agreement. Certain of the representations and warranties contained in the
Purchase Agreement and other Ancillary Agreements are given jointly and
severally by the Sellers, including without limitation certain representations
and warranties relating to FMC's Corporate Technology Center. Notwithstanding
anything in the Purchase Agreement or in any Ancillary Agreement to the
contrary, the Parties agree that as an inducement to the Harsco Indemnitors to
enter into the Purchase Agreement and the Ancillary Agreements, FMC will be
solely responsible for the truth, correctness and completeness of the FMC
Representations and the Shared Representations except to the extent any Harsco
Indemnitor is responsible pursuant to Section 6.2(a) hereof and except to the
extent any Harsco

                                      -4-
<PAGE>
 
Indemnitor had actual knowledge of the breach of such representation or warranty
prior to the date hereof.

     4.   Additional Covenants of FMC.

          4.1  Covenants in the Purchase Agreement and Ancillary Agreements.
Certain of the covenants contained in the Purchase Agreement and other Ancillary
Agreements are given jointly and severally by the Sellers on behalf of UDLP.
Notwithstanding anything in the Purchase Agreement or in any Ancillary Agreement
to the contrary, it is the intention of the Parties, and is an inducement to the
Harsco Indemnitors to enter into the Purchase Agreement and the Ancillary
Agreements, that FMC be solely responsible for performing, satisfying,
discharging and complying with, or for causing UDLP to perform, satisfy,
discharge and comply with all of the FMC Covenants. FMC hereby agrees that it
will be solely responsible for performing, satisfying, discharging and complying
with, or for causing UDLP to perform, satisfy, discharge and comply with all of
the FMC Covenants.

          4.2  Intercompany Loans. FMC shall repay in full all outstanding
intercompany obligations between it and UDLP or any of the Subsidiaries at or
prior to the Closing, except as otherwise provided in Section 5(h) of the
Purchase Agreement.

          4.3  Representations and Warranties; Performance of Obligations. On
the Closing Date, FMC shall deliver a certificate to the Harsco Indemnitors to
the same effect as the certificate required to be delivered by FMC to the Buyer
pursuant to Section 3(a) of the Purchase Agreement (if such certificate is
delivered).

          4.4  File Plan. FMC will include in any File Plan delivered pursuant
to Section 8(g)(ii) of the Purchase Agreement any items requested by Harsco.

     5.   Additional Covenants of the Harsco Indemnitors.

          5.1  Representations and Warranties; Performance of Obligations. On
the Closing Date, the Harsco Indemnitors shall deliver a certificate to FMC to
the effect that all of the representations and warranties of the Harsco
Indemnitors contained in this Agreement are true, correct and complete on and as
of the Closing Date with the same effect as though such representations and
warranties had been made on and as of such date and that all of the terms,
covenants, agreements and conditions of this Agreement to be complied with,
performed or satisfied by the Harsco Indemnitors on or before the Closing Date
have been duly complied with performed or satisfied in all material respects.

                                      -5-
<PAGE>
 
     6.   Contribution.

          6.1  Payments in Respect of San Jose/Santa Clara Remediation Costs,
Stock Options and Restricted Stock and CTC and Transferred Employees; Buyer
Note.

          (a)  At or before the Closing, FMC shall pay to the Harsco Indemnitors
     $2,492,160 to pay certain Remediation Costs relating to the Sites covered
     by the Settlement and Advance Agreement, which costs are likely to be
     incurred and payable by FMC and reimbursable by the Buyer pursuant to the
     terms of the Purchase Agreement.

          (b)  Within two business days after the Closing, the Harsco
     Indemnitors shall pay FMC 40% of the Agreed Value of (i) the unexercised
     FMC stock options issued to UDLP executives and employees in 1994 and 1995
     which are either currently vested or scheduled to vest on or prior to
     January 31, 1998 (all of which options are listed on Exhibit A hereto,
     which listing includes as to each such option, the name of the optionee,
     the year of grant, the exercise price and the number of Shares subject
     thereto) and (ii) certain shares of the FMC restricted stock issued to UDLP
     executives and employees subsequent to January 1, 1994 (which will become
     unrestricted upon the Closing) (all of which shares are listed on Exhibit A
     hereto, which listing includes as to each recipient, the name of the
     recipient, the date of grant, the closing trading price of FMC common stock
     on the date of grant, and the number of shares granted, and provided that
     FMC represents that such listing does not include, as to Mr. Rabaut, any
     shares granted on account of his position at FMC). For purposes of the
     foregoing, "Agreed Value" means the market value of the shares of FMC
     common stock issuable under such options less the aggregate exercise price
     and the market value of the shares of restricted stock (without
     restriction), in each case as calculated based on the closing trading price
     of the FMC common stock on the Closing Date or, in the case of restricted
     stock, on the date of grant as reported in the Wall Street Journal.

          (c)  The net effect upon the net worth adjustment contained in Section
     2(b) of the Purchase Agreement of the impact of including CTC and the
     Transferred Employees as part of the accounts reflected in the Adjusted Net
     Worth Amount as of both June 30, 1997 and the Closing Date (the "CTC
     Adjustment Amount") shall be separately calculated by FMC in connection
     with the preparation of the Closing Statement and provided to Harsco with
     the Closing Statement. Harsco shall have the right, with FMC's full
     cooperation, to review and audit FMC's calculation of the CTC Adjustment
     Amount. If the CTC Adjustment Amount is negative, FMC shall pay 40% of such
     amount to Harsco. If the CTC Adjustment is positive, Harsco shall pay 40%
     of such amount to FMC. Any such payments shall be made as soon as possible
     after they are determined and shall be appropriately adjusted if the
     relevant accounts are adjusted in connection with the finalization of the
     Closing Statement. Amounts payable hereunder shall bear interest from the
     Closing Date at the rate provided in Section 2(b)(ii) of the Purchase
     Agreement.

                                      -6-
<PAGE>
 
          (d)  FMC shall pay to the Harsco Indemnitors 40% of any amounts
     collected in respect of the FNSS royalty dispute (as more specifically
     described in Schedule 7(f) to the Purchase Agreement the "FNSS Royalty
     Dispute"), to the extent such amounts are attributable to periods following
     the formation of UDLP.

          (e)  Notwithstanding anything to the contrary in the Supplemental
     Agreement No. 1 to Purchase Agreement, dated as of August 25, 1997, by and
     among FMC Corporation, Harsco Corporation, Harsco UDLP Corporation and Iron
     Horse Acquisition Corp. (the "Supplemental Agreement") or in the provisions
     of the Special Note (as defined therein), as between the Harsco Indemnitors
     and FMC, (i) the Harsco Indemnitors shall receive from the Buyer
     $340,000,000 plus 40% of the Adjustment Amount (whether positive or
     negative), in immediately available funds, at and upon the Closing and FMC
     shall receive from the Buyer a total of $510,000,000 plus 60% of the
     Adjustment Amount (whether positive or negative), in immediately available
     funds, and, if issued, the Special Note and (ii) for all purposes of the
     Supplemental Agreement, the term "Sellers" shall mean FMC, except in the
     case of Section 5(a) thereof, in which "Sellers" shall mean FMC and the
     Harsco Indemnitors. The Harsco Indemnitors shall pay to FMC in immediately
     available funds, within three business days following the later of (A) the
     maturity of the Special Note (whether at scheduled maturity or pursuant to
     the mandatory prepayment provisions of Section 2 of the Supplemental
     Agreement or pursuant to acceleration) or (B) the final determination of
     any dispute regarding the amount to be finally paid to FMC under the
     Special Note, 40% of the first $25,000,000 of any Payment Deficiency. For
     purposes of this Section 6.1(e), "Payment Deficiency" means the difference
     between (A) $50,000,000 and (B) the principal amount of the Special Note
     actually paid to FMC after set-off, if any, by Buyer. For example, if the
     amount collected by FMC on the Special Note is $40,000,000, then the amount
     that the Harsco Indemnitors shall pay to FMC pursuant to this Section
     6.1(e) shall be $4,000,000, and if the amount collected by FMC on the
     Special Note is $20,000,000, then the amount that the Harsco Indemnitors
     shall pay to FMC pursuant to this Section 6.1(e) shall be $10,000,000. 
     * * */1/, and the Harsco Indemnitors will have the right to participate in
     such efforts led by FMC. In the event of any dispute between FMC and the
     Buyer with respect to payment on the Special Note, FMC shall not agree to
     any settlement of any such dispute that would have an adverse effect on the
     Harsco Indemnitors without first consulting with the Harsco Indemnitors and
     obtaining the written consent of the Harsco Indemnitors (which consent
     shall not be unreasonably withheld or delayed). In addition, in the event
     of any litigation concerning any such dispute, FMC will keep the Harsco
     Indemnitors advised of all material developments in such litigation, and
     the Harsco Indemnitors shall have the right to join with FMC in such
     litigation at the sole expense of the Harsco Indemnitors.

- ---------------------

/1/  The omitted text is the subject of a Confidential Treatment Request filed
     with the Securities and Exchange Commission (the "Commission"). The text
     for which confidential treatment has been requested has been filed
     separately with the Commission.

                                      -7-
<PAGE>
 
          6.2  Payments in Respect of Indemnification.

          (a)  Each Party will contribute its Pro Rata Portion of all joint
     obligations under the Purchase Agreement, as defined in clauses (i) through
     (ix) below, in accordance with the following sentence (the "Joint
     Obligations"). Each Party's contribution obligations under this paragraph
     6.2(a) shall be limited to such Party's Pro Rata Portion of the aggregate
     Loss suffered or sustained by both Parties, after taking into account any
     indemnifiable Loss suffered by such Party, in order that both Parties
     ultimately bear their Pro Rata Portion of such aggregate Loss. Each Party
     agrees to indemnify and hold harmless the other Party against the amount of
     any Loss which the other Party may suffer, sustain or become subject to in
     excess of such Party's Pro Rata Portion of such Loss, in the event that the
     other Party becomes (or any third party asserts that such other Party is)
     liable or otherwise responsible. For the purposes of this Agreement, Joint
     Obligations means:

               (i)  any obligation of the Sellers under Section 8(f)(iii) of the
          Purchase Agreement, to the extent that it relates to:

                    (A)  post-1993 operation of UDLP,

                    (B)  subject to clause (iii)(A) of Section 6.2(b) below,
               environmental conditions which are discovered at York subsequent
               to December 31, 1998 and not proven by FMC to have been a Harsco
               Environmental Liability Event (as defined in the Participation
               Agreement) or

                    (C)  properties acquired or first used by UDLP subsequent to
               its formation,

               (ii) any indemnification obligation of Sellers:

                    (A)  under Section 10(b) (tax indemnification) of the
               Purchase Agreement or

                    (B)  under Section 11(a)(i) of the Purchase Agreement which
               is based on breach of a Shared Representation; provided that, any
               indemnification obligation under Section 11(a)(i) of the Purchase
               Agreement which is based on a Shared Representation shall be a
               Joint Obligation only to the extent that the aggregate of all
               Losses suffered and paid by FMC as a result of breaches of Shared
               Representations on a cumulative basis as a result of the
               indemnification obligations under Section 11(a)(i) of the
               Purchase Agreement exceed $10,000,000.

               (iii)  any obligation of Sellers to pay their portion of the fees
          and expenses of Ernst & Young L.L.P. and the Accounting Firm pursuant
          to Section 2(b) of the Purchase Agreement or the escrow agent pursuant
          to the Escrow Agreement,

                                      -8-
<PAGE>
 
               (iv)  any obligation of Sellers under Section 2(b) of the
          Purchase Agreement to pay any amount by which the Estimated Final
          Purchase Price exceeds the Final Purchase Price,

               (v)  any obligation of Sellers to pay their portion of
          intellectual property recordation costs pursuant to Section 8(o) of
          the Purchase Agreement,

               (vi)  any obligation of Sellers to pay their portion of certain
          taxes pursuant to Section 10(h) of the Purchase Agreement,

               (vii)  any obligation of Sellers to pay a portion of any
          insurance recovery pursuant to Section 8(f)(v) of the Purchase
          Agreement;

               (viii)  any obligation of Sellers to pay the amount of any
          negative Cash Balance to the Buyer pursuant to Section 8(p) of the
          Purchase Agreement, or

               (ix)  any obligation or liability relating to UDLP listed on
          Schedule 7(f) to the Purchase Agreement which is retained or assumed
          on a joint basis, except for amounts payable in connection with the
          FNSS Royalty Dispute which are attributable to the period prior to
          formation of UDLP.

          (b)  FMC agrees to indemnify and hold harmless the Harsco Indemnitors
     against the amount of any Loss which Harsco may suffer, sustain or become
     subject to in the event that Harsco becomes (or the Buyer or any third
     party asserts that any Harsco Indemnitor is) liable or otherwise
     responsible for:

               (i)  any Losses suffered or incurred by any Harsco Indemnitor to
          the extent arising from:

                    (A)  any breach of any representation or warranty of FMC
               contained herein or of any FMC Representation, except to the
               extent any Harsco Indemnitor is responsible pursuant to Section
               6.2(a) hereof and except to the extent any Harsco Indemnitor had
               actual knowledge of the breach of such representation or warranty
               prior to the date hereof,

                    (B)  any breach of any Shared Representation, but only to
               the extent that the aggregate of all Losses suffered and paid by
               FMC as a result of a breach of a Shared Representation on a
               cumulative basis as a result of the indemnification obligation
               under Section 11(a)(i) of the Purchase Agreement does not exceed
               $10,000,000 or 

                    (C)  any breach of any covenant of FMC contained herein,
               any breach of any FMC Covenant or any breach by FMC of any
               Several Covenant,

                                      -9-
<PAGE>
 
               (ii)  any Losses suffered or incurred by any Harsco Indemnitor
          arising from:

                     (A)  any wrongful, self-dealing, grossly negligent,
               reckless or bad faith conduct by FMC in connection with its
               conduct on behalf of UDLP or any Harsco Indemnitor, including in
               connection with the sale of FMC's Partnership Interest in UDLP or
               Harsco's Partnership Interest in UDLP pursuant to the Purchase
               Agreement or

                     (B)  any failure by FMC to observe any applicable duty or
               obligation to UDLP or any Harsco Indemnitor arising out of any
               wrongful, self-dealing, grossly negligent, reckless or bad faith
               conduct by FMC;

          provided that, in the event of any claim under this clause (ii)
          relating to the consideration payable or the terms and conditions of
          the sale of UDLP, FMC's conduct shall be reviewed on a comparable
          basis to that provided to a Delaware corporation and its directors
          under the business judgment rule,

               (iii)  subject to clause (i)(A) of Section 6.2(a) above, any
          obligation of Sellers under Section 8(f)(iii) of the Purchase
          Agreement to the extent that it relates to:

                    (A)  the first $1,000,000 that relates to environmental
               conditions at UDLP's York property that Harsco would otherwise be
               responsible for under clause (i) of Section 6.2(c) below,

                    (B)  the pre-1994 operation of FMC's defense business, or

                    (C)  properties contributed by FMC to UDLP upon its
               formation and

               (iv)  any obligation or liability relating to UDLP which is
          retained or assumed by FMC as specifically set forth in the Purchase
          Agreement, including those items listed on Schedule 7(f) thereto and
          all amounts payable in connection with the FNSS Royalty Dispute which
          are attributable to periods prior to formation of UDLP.

For purposes of this Agreement, the actual knowledge of the Harsco Indemnitors
shall be deemed to refer only to the actual present knowledge of Derek Hathaway
and Leonard Campanaro, without such individual having conducted any inquiry or
review.

          (c)  The Harsco Indemnitors agree to indemnify and hold harmless FMC
     against the amount of any Loss which FMC may suffer, sustain or become
     subject to in the event that FMC becomes (or Buyer or any third party
     asserts that FMC is) liable or otherwise responsible for:

                                      -10-
<PAGE>
 
               (i)  subject to clauses (i)(A) and (i)(B) of Section 6.2(a) above
          and subject to clause (iii)(A) of Section 6.2(b) above, any obligation
          of Sellers under Section 8(f)(iii) to the extent that it relates to:

                    (A)  the pre-1994 operation of Harsco's defense business or

                    (B)  properties contributed by Harsco to UDLP upon its
               formation,

               (ii)  any Losses suffered or incurred by FMC to the extent
          arising from:

                    (A)  any breach of any Harsco Representation or any
          representation or warranty of any Harsco entity contained herein or

                    (B)  any breach by Harsco of any Several Covenant or any
               covenant of any Harsco entity contained herein and

               (iii)  any obligation or liability relating to UDLP which is
          retained or assumed by Harsco as specifically set forth in the
          Purchase Agreement, including those items listed on Schedule 7(f)
          thereto.

          (d)  Each Party further agrees to indemnify and hold harmless the
     other Party against the amount of any Loss which the other Party may
     suffer, sustain or become subject to in respect of any obligation of such
     Party which is, pursuant to the terms of the Purchase Agreement, a several
     obligation of such Party alone and not a joint and several obligation of
     the Parties.

          6.3  Indemnity Procedures.

          (a)  Indemnity Dispute Costs. Following the Closing, the Parties will
     cooperate in a commercially reasonable manner in connection with any
     indemnification or other claim made by the Buyer or any third party under
     the Purchase Agreement or otherwise relating to UDLP, but subject to the
     provisions of the Purchase Agreement, including the provisions contained in
     Section 2(b), Section 10 and Section 11(f) of the Purchase Agreement
     relating to the control of the defense and management of certain
     indemnification and other claims and matters by FMC. In the event that FMC
     determines to dispute, defend or otherwise manage any such claim or any
     other claim made by the Buyer or any third party, then FMC shall be
     responsible for all of the costs, fees and expenses incurred on behalf of
     FMC in connection with such dispute, defense or management (the "Indemnity
     Dispute Costs"). The Harsco Indemnitors shall be responsible for all of the
     costs, fees and expenses of their participation in such dispute, defense or
     management.

          (b)  Third Party Claims. With respect to any indemnification under
     this Section 7 in respect of, arising out of or involving a claim by any
     Person, including the Buyer (a "Third Party Claim"), against a Party hereto
     (the "Indemnified Party"), FMC must notify the

                                      -11-
<PAGE>
 
     Harsco Indemnitors of the Third Party Claim within a reasonable time after
     receipt by FMC of written notice of the Third Party Claim. Thereafter, FMC
     shall, within ten days of receipt thereof, deliver copies of all notices
     and documents (including court papers) received by them relating to the
     Third Party Claim to the Harsco Indemnitors.

               (c)  Defense of Third Party Claims. If a Third Party Claim is
     made against an FMC Indemnified Party for a claim relating to the breach of
     a representation, warranty or covenant made jointly by the Parties in the
     Purchase Agreement, the Harsco Indemnitors shall be entitled to participate
     in the defense thereof (a "Joint Third Party Claim"). FMC shall cooperate
     in all reasonable respects with the Harsco Indemnitors in connection with
     such defense, including by permitting the Harsco Indemnitors to appoint
     counsel and to have such counsel observe and participate in the defense of
     the Joint Third Party Claim if the Harsco Indemnitors choose at the sole
     expense of the Harsco Indemnitors. In connection with all such matters, FMC
     shall be available to consult with the Harsco Indemnitors as reasonably
     requested concerning the management of such matters and shall consider in
     good faith any comments, suggestions or proposals made by the Harsco
     Indemnitors in connection therewith. FMC shall not admit any liability with
     respect to, or settle, compromise or discharge, any Joint Third Party Claim
     without the prior written consent of the Harsco Indemnitors (which will not
     be unreasonably withheld or delayed). The management of, and all decisions
     regarding (including decisions regarding settlement of) any dispute or
     defense of a claim for which either FMC or the Harsco Indemnitors are
     solely responsible pursuant to the terms of the Purchase Agreement shall at
     all times be at the direction of and otherwise made by the Party who bears
     responsibility for the claim.

          6.4  Survival of Representations. The representations and warranties
in this Agreement shall survive the Closing to the same extent set forth in the
Purchase Agreement.

          7.   Escrow Deposit. If and when the Escrow Deposit, referred to in
the Escrow Agreement attached as Exhibit 6(c) to the Purchase Agreement is to be
paid to FMC and Harsco, it shall be allocated on a Pro Rata Basis to the
Parties.

          8.   Prepayment of Intercompany Debt; Allocation of Cash Distributions
and Payments. Immediately prior to the Closing, FMC shall repay all intercompany
debt owed to UDLP, together with interest accrued through the date of repayment.
Promptly following the Closing Date, FMC shall pay to the Harsco Indemnitors (i)
100% of any amounts attributable to limited partner allocations that accrue
through the Closing (to the extent not directly distributed to Harsco) and (ii)
40% of any other distribution or payment made by UDLP to FMC at Closing for the
ratable benefit of both partners (to the extent not directly distributed to
Harsco). The Harsco Indemnitors hereby acknowledge and agree that any
distribution or payment made by UDLP to FMC at Closing in respect of "B" service
fees that accrue through the Closing shall be retained solely by FMC.

     9.   Limited Partner Consent. The Harsco Indemnitors hereby consent and
agree to the terms and provisions of the Transition Services Agreement, the
Technology and Environmental

                                     -12-
<PAGE>
 
Services Agreement, the Amended and Restated FMC Intellectual Property
Agreement, the Amended and Restated Lease Agreement and the FMC Resource
Transfer.

     10.  Allocation of Expenses. Each Party hereby agrees to pay its Pro Rata
Portion of the following out-of-pocket expenses incurred by the Indemnitors in
connection with the transactions contemplated by the Purchase Agreement: (i)
costs of the preparation and filing of all UDLP Tax Returns relating to Taxes
incurred in connection with the pre-closing business and operations of UDLP or
the transactions contemplated by the Purchase Agreement and (ii) costs of the
preparation of financial statements of UDLP incurred in connection with the
transactions contemplated by the Purchase Agreement. Each Party hereby agrees to
pay its own respective costs for legal services, filing fees and regulatory
expenses incurred in order to comply with United States and foreign antitrust
and competition laws.

     11.  Miscellaneous.

          11.1  No Third-Party Beneficiaries. This Agreement shall not confer
any rights or remedies upon any Person other than the Indemnitors and their
respective successors and permitted assigns.

          11.2  Entire Agreement. This Agreement, together with the Purchase
Agreement (and the exhibits and schedules thereto) constitute the entire
agreement among the Indemnitors with respect to the subject matter hereof and
supersedes any prior understandings, agreements, or representations by or among
the Indemnitors, written or oral, to the extent they related in any way to the
subject matter hereof.

          11.3  Succession and Assignment. This Agreement shall be binding upon
and inure to the benefit of the Indemnitors and their respective successors and
permitted assigns. No Indemnitor may assign either this Agreement or any of such
Indemnitor's rights, interest or obligations hereunder without the prior written
approval of the other Indemnitors.

          11.4  Counterparts. This Agreement may be executed in one or more
counterparts (including by means of telecopied signature pages), each of which
shall be deemed an original but all of which together will constitute one and
the same instrument.

          11.5  Headings. The section headings and captions contained in this
Agreement are inserted for convenience only and shall not affect in any way the
meaning or interpretation of this Agreement.

          11.6  Notices. All notices, requests, claims, demands and other
communications hereunder shall be in writing and shall be given by a reputable
and recognized overnight delivery service (e.g. Federal Express, etc.), against
receipt thereof, by telex, by telecopier against a confirmed receipt therefor or
by mail (registered or certified mail, postage prepaid, return receipt
requested) to the respective parties as follows:

                                      -13-
<PAGE>
 
                    if to FMC:
                    --------- 

                    FMC Corporation
                    200 East Randolph Drive
                    Chicago, Illinois 60601
                    Telecopy No.: (312) 861-6012
                    Attention: J. Paul McGrath

                    with a copy to:
                    -------------- 

                    Kirkland & Ellis
                    200 East Randolph Drive
                    Chicago, Illinois 60601
                    Telecopy No.: (312) 861-2200
                    Attention: Glen E. Hess, P.C.

                    if to the Harsco Indemnitors:
                    ---------------------------- 

                    Harsco Corporation
                    350 Poplar Church Road
                    Camp Hill, PA  17011
                    Telecopy No.: (717) 763-6402
                    Attention: Paul C. Coppock

                    with a copy to:
                    -------------- 

                    Morgan, Lewis & Bockius LLP
                    1800 M Street, N.W.
                    Washington, D.C.  20036
                    Telecopy No.: (202) 467-7176
                    Attention: Lloyd H. Feller

or to such other address as any Indemnitor hereto may, from time to time,
designate in a written notice given in like manner. Any notice given in
accordance with the requirements of this Section 11.6 shall be deemed to have
been received when delivered in person or via telecopier against receipt
thereof, five business days after deposit in the U.S. mail against receipt
thereof, and one business day after deposit with a reputable express overnight
courier service against receipt therefor.

          11.7  Governing Law. This Agreement shall be governed by and construed
in accordance with the internal laws of the State of Delaware without giving
effect to any choice or conflict of law provision or rule (whether of the State
of Delaware or any other jurisdiction) that would cause the application of the
laws of any jurisdiction other than the State of Delaware.

                                      -14-
<PAGE>
 
          11.8  Amendments and Waivers. No amendment or waiver of any provision
of this Agreement shall be valid unless the same shall be in writing and signed
by all of the Indemnitors.

          11.9  Severability. Any provision of this Agreement which is invalid,
illegal or unenforceable in any jurisdiction shall, as to that jurisdiction, be
ineffective to the extent of such invalidity, illegality or unenforceability,
without affecting in any way the remaining provisions hereof in such
jurisdiction or rendering that or any other provision of this Agreement invalid,
illegal or unenforceable in any other jurisdiction. Furthermore, in lieu of such
illegal, invalid or unenforceable provision, there shall be added automatically
as part of this Agreement a provision as similar in its terms to such illegal,
invalid or unenforceable provision as may be possible and be legal, valid and
enforceable. 

          11.10  Construction. The Indemnitors have participated jointly in the
negotiation and drafting of this Agreement. In the event an ambiguity or
question of intent or interpretation arises, this Agreement shall be construed
as if drafted jointly by the Indemnitors and no presumption or burden of proof
shall arise favoring or disfavoring any Indemnitor by virtue of the authorship
of any of the provisions of this Agreement. The word "including" shall mean
including without limitation. Section references used herein, unless otherwise
specified, refer to Sections of this Agreement.

          11.11  Exclusive Remedy; Waiver. Subject to Section 11.2 above, the
indemnification and contribution arrangements set forth in this Agreeement
constitute the exclusive arrangement among the parties with respect to the
matters set forth herein and are in lieu of any common law rights or remedies
any party may have as a joint and several indemnitor or otherwise (except with
respect to claims for fraud). Accordingly, each party expressly waives any right
it may have, and agrees not to assert any claim for, contribution or indemnity
with respect to the matters set forth herein except as set forth herein.

                             *    *    *    *    *

                                     -15-
<PAGE>
 
          IN WITNESS WHEREOF, the undersigned have executed this Allocation and
Contribution Agreement as of the date first above written.

                                    FMC CORPORATION
 
 
                                    By:    /s/ J. Paul McGrath
                                       ----------------------------------
                                    Name:  J. Paul McGrath
                                         --------------------------------
                                    Title: Senior Vice President
                                          -------------------------------


                                    HARSCO CORPORATION


                                    By:    /s/ Leonard A. Campanaro
                                       --------------------------------
                                    Name:  L.A. Campanaro
                                         ---------------------------------
                                    Title: Senior Vice President and CFO
                                          -------------------------------


                                    HARSCO UDLP CORPORATION
 
 
                                    By:    /s/ Leonard A. Campanaro
                                       ----------------------------------
                                    Name:  L.A. Campanaro
                                         --------------------------------
                                    Title: Treasurer
                                          -------------------------------


                                      -16-


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