DEXTER CORP
SC 13D/A, 2000-03-23
PAINTS, VARNISHES, LACQUERS, ENAMELS & ALLIED PRODS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934

                                (Amendment No. 9)

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

                               DEXTER CORPORATION
                                (Name of Issuer)

COMMON STOCK, $1.00 PAR VALUE PER SHARE                    252165105
    (Title of class of securities)                       (CUSIP number)

                            RICHARD A. WEINBERG, ESQ.
                        C/O ISP MANAGEMENT COMPANY, INC.
                                 1361 ALPS ROAD
                             WAYNE, NEW JERSEY 07470
                                 (973) 628-4000
            (Name, address and telephone number of person authorized
                     to receive notices and communications)

                                 WITH A COPY TO:

                             STEPHEN E. JACOBS, ESQ.
                           WEIL, GOTSHAL & MANGES LLP
                                767 FIFTH AVENUE
                          NEW YORK, NEW YORK 10153-0119
                                 (212) 310-8000

                                 MARCH 23, 2000
             (Date of event which requires filing of this statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-(g), check the
following box [ ].

Note: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See ss. 240.13d-7 for other
parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purposes of Section 18 of the Securities Exchange Act of
1934 (the "Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act. (However, see the
Notes.)

                         (Continued on following pages)

                               (Page 1 of 44 Pages)


NY2:\892137\02\j4dl02!.DOC\54104.0016
<PAGE>
<TABLE>
<CAPTION>
- -----------------------------------------------------------              --------------------------------------------------------
CUSIP No. 252165105                                             13D                                           Page 2 of 44 Pages
- -----------------------------------------------------------              --------------------------------------------------------

- ----------------------    -------------------------------------------------------------------------------------------------------
<S>                       <C>
          1               NAME OF REPORTING PERSON                                ISP OPCO HOLDINGS INC.
                          S.S. OR I.R.S. IDENTIFICATION NO.
                          OF ABOVE PERSON
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          2               CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                                    (a) [ ]
                                                                                                               (b) [X]
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          3               SEC USE ONLY
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          4               SOURCE OF FUNDS:                                                  OO
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          5               CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
                          REQUIRED PURSUANT TO ITEM 2(d) OR 2(e):                                                     [ ]
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          6               CITIZENSHIP OR PLACE OF ORGANIZATION:                                              Delaware
- ----------------------    ------------------------------------------------------------------------ ------------------------------

      NUMBER OF                   7               SOLE VOTING POWER:                                                  0
        SHARES
                          -------------------     ------------------------------------------------ ------------------------------
     BENEFICIALLY                 8               SHARED VOTING POWER:                                        2,299,200
       OWNED BY
                          -------------------     ------------------------------------------------ ------------------------------
         EACH                     9               SOLE DISPOSITIVE POWER:                                             0
      REPORTING
                          -------------------     ------------------------------------------------ ------------------------------
     PERSON WITH                  10              SHARED DISPOSITIVE POWER:                                   2,299,200

- ----------------------    ------------------------------------------------------------------------ ------------------------------
         11               AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING PERSON:
                                                                                                              2,299,200
- ----------------------    ------------------------------------------------------------------------ ------------------------------

         12               CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:                        [ ]

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

         13               PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):                                           9.98%
- ----------------------    ------------------------------------------------------------------------ ------------------------------
         14               TYPE OF REPORTING PERSON:                               CO
- ----------------------    ------------------------------------------------------------------------ ------------------------------

</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- -----------------------------------------------------------              --------------------------------------------------------
CUSIP No. 252165105                                             13D                                           Page 3 of 44 Pages
- -----------------------------------------------------------              --------------------------------------------------------

- ----------------------    -------------------------------------------------------------------------------------------------------
<S>                       <C>
          1               NAME OF REPORTING PERSON                                ISP INVESTMENTS INC.
                          S.S. OR I.R.S. IDENTIFICATION NO.
                          OF ABOVE PERSON
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          2               CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                                    (a) [ ]
                                                                                                               (b) [X]
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          3               SEC USE ONLY
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          4               SOURCE OF FUNDS:                                                  WC, OO
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          5               CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
                          REQUIRED PURSUANT TO ITEM 2(d) OR 2(e):                                                     [ ]
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          6               CITIZENSHIP OR PLACE OF ORGANIZATION:                                              Delaware
- ----------------------    ------------------------------------------------------------------------ ------------------------------
      NUMBER OF                   7               SOLE VOTING POWER:                                          2,299,200
        SHARES
                          -------------------     ------------------------------------------------ ------------------------------
     BENEFICIALLY                 8               SHARED VOTING POWER:                                                0
       OWNED BY
                          -------------------     ------------------------------------------------ ------------------------------
         EACH                     9               SOLE DISPOSITIVE POWER:                                     2,299,200
      REPORTING
                          -------------------     ------------------------------------------------ ------------------------------
     PERSON WITH                  10              SHARED DISPOSITIVE POWER:                                           0

- ----------------------    ------------------------------------------------------------------------ ------------------------------
         11               AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING PERSON:
                                                                                                              2,299,200
- ----------------------    ------------------------------------------------------------------------ ------------------------------

         12               CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:                        [ ]

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

         13               PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):                                           9.98%
- ----------------------    ------------------------------------------------------------------------ ------------------------------
         14               TYPE OF REPORTING PERSON:                               CO
- ----------------------    ------------------------------------------------------------------------ ------------------------------

</TABLE>


<PAGE>

<TABLE>
<CAPTION>
- -----------------------------------------------------------              --------------------------------------------------------
CUSIP No. 252165105                                             13D                                           Page 4 of 44 Pages
- -----------------------------------------------------------              --------------------------------------------------------

- ----------------------    -------------------------------------------------------------------------------------------------------
<S>                       <C>
          1               NAME OF REPORTING PERSON                                INTERNATIONAL SPECIALTY
                          S.S. OR I.R.S. IDENTIFICATION NO.                       PRODUCTS INC.
                          OF ABOVE PERSON
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          2               CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                                    (a) [ ]
                                                                                                               (b) [X]
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          3               SEC USE ONLY
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          4               SOURCE OF FUNDS:                                                  OO
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          5               CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
                          REQUIRED PURSUANT TO ITEM 2(d) OR 2(e):                                                     [ ]
- ----------------------    ------------------------------------------------------------------------------------ ------------------
          6               CITIZENSHIP OR PLACE OF ORGANIZATION:                                                Delaware
- ----------------------    ------------------------------------------------------------------------ ------------------------------
      NUMBER OF                   7               SOLE VOTING POWER:                                                  0
        SHARES
                          -------------------     ------------------------------------------------ ------------------------------
     BENEFICIALLY                 8               SHARED VOTING POWER:                                        2,299,200
       OWNED BY
                          -------------------     ------------------------------------------------ ------------------------------
         EACH                     9               SOLE DISPOSITIVE POWER:                                             0
      REPORTING
                          -------------------     ------------------------------------------------ ------------------------------
     PERSON WITH                  10              SHARED DISPOSITIVE POWER:                                   2,299,200

- ----------------------    ------------------------------------------------------------------------ ------------------------------
         11               AGGREGATE AMOUNT BENEFICIALLY OWNED BY REPORTING PERSON:
                                                                                                              2,299,200
- ----------------------    ------------------------------------------------------------------------ ------------------------------

         12               CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES:                        [ ]

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

         13               PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):                                           9.98%
- ----------------------    ------------------------------------------------------------------------ ------------------------------
         14               TYPE OF REPORTING PERSON:                               CO
- ----------------------    ------------------------------------------------------------------------ ------------------------------

</TABLE>
<PAGE>
                     This Amendment No. 9 ("Amendment No. 9") amends the
Statement on Schedule 13D (the "Schedule 13D") filed on April 22, 1999, as
amended by Amendment No. 1 filed on August 11, 1999, Amendment No. 2 filed on
September 8, 1999, Amendment No. 3 filed on September 27, 1999, Amendment No. 4
filed on December 14, 1999, Amendment No. 5 filed on December 16, 1999,
Amendment No. 6 filed on January 27, 2000, Amendment No. 7 filed on February 11,
2000, and Amendment No. 8 filed on February 24, 2000, by and on behalf of ISP
Opco Holdings Inc. ("ISP Opco"), ISP Investments Inc. ("ISP Investments") and
International Specialty Products Inc. ("ISP" and together with ISP Investments
and ISP Opco, the "Reporting Persons") with respect to their ownership of common
stock, par value $1.00 per share (the "Common Stock"), of Dexter Corporation
(the "Company"). Capitalized terms used herein and not defined herein have the
meanings ascribed thereto in the Schedule 13D, as amended.

ITEM 4.              PURPOSE OF THE TRANSACTION

                     On March 23, 2000, Samuel J. Heyman, Chairman of the Board
of ISP, sent the following letter to K. Grahame Walker, Chairman of the Board
and Chief Executive Officer of the Company:

                Dear Grahame:

                     Based upon our evaluation to date, ISP's Board has
                authorized an increase in the price of ISP's cash merger
                proposal to $50 per share. If we receive the proper cooperation
                from Dexter in connection with the balance of the due diligence
                process and Dexter can demonstrate that the value of the Company
                would justify a higher price, we would consider increasing this
                price as well.

                     You should know that ISP has, on this date, executed a
                commitment letter in which Chase has committed to raise all the
                financing necessary for the acquisition, a copy of which I have
                attached. You should note that Chase's commitment for $1.825
                billion contains provision for a tender facility so that Dexter
                shareholders can receive cash payments promptly.

                     Grahame, we are most interested in concluding this
                transaction and are prepared to proceed promptly. However,
                should Dexter be inclined to proceed on a different course, I
                sincerely hope that it will allow the Company's shareholders to
                make the ultimate decision as to what is in their best
                interests.

                     We are still awaiting the due diligence information which
                we requested in our March 8th letter.


                                                    Sincerely,

                                                    /s/   Samuel J. Heyman




                                       5
<PAGE>
                     On March 23, 2000, ISP Opco obtained a commitment from The
Chase Manhattan Bank (the "Commitment Letter") to provide, subject to the
satisfaction of certain customary conditions described therein, senior credit
facilities in the aggregate amount of $1,825,000,000 in order to finance the
acquisition of the Company, refinance certain existing indebtedness of ISP's
subsidiaries, the Company and the Company's subsidiaries, and to provide working
capital for the combined companies following the acquisition. A copy of the
Commitment Letter is attached hereto as Exhibit 1.


ITEM 7.              MATERIAL TO BE FILED AS EXHIBITS

                     Exhibit No. 1:  Commitment Letter.




             [The remainder of this page intentionally left blank.]















                                       6
<PAGE>
                                   SIGNATURES

                     After reasonable inquiry and to the best of their knowledge
and belief, the undersigned certify that the information set forth in this
Statement is true, complete and correct.


Dated:   March 23, 2000
                                      ISP OPCO HOLDINGS INC.
                                      ISP INVESTMENTS INC.
                                      INTERNATIONAL SPECIALTY PRODUCTS INC.

                                      By: /s/ Randall R. Lay
                                          -------------------------------------
                                          Randall R. Lay
                                          Executive Vice President and
                                            Chief Financial Officer















                                       7
<PAGE>
                                  EXHIBIT INDEX

Exhibit No.                          Document                          Page No.
- ----------                           --------                          -------

    1                         Commitment Letter.                          9



















                                       8

                                                                     Exhibit 1
                                                                     ---------


                    [Letterhead of The Chase Manhattan Bank]


                                                                March 23, 2000


                            Senior Credit Facilities
                            ------------------------
                                Commitment Letter
                                -----------------


ISP Opco Holdings Inc.
c/o ISP Management Company, Inc.
1361 Alps Road
Wayne, New Jersey  07470

Attention: Susan Yoss, Treasurer/Senior Vice President

Ladies and Gentlemen:

                     You have advised The Chase Manhattan Bank ("Chase") and
Chase Securities Inc. ("CSI") that ISP Opco Holdings Inc., a Delaware
corporation (the "Borrower"), will require credit facilities in order to finance
the acquisition (the "Acquisition") by a newly formed direct or indirect
wholly-owned subsidiary of the Borrower ("Newco") of all of the outstanding
capital stock (the "Target Stock") of Dexter Corporation, a Connecticut
corporation (the "Target"). The Transaction will be effected either (a) through
a tender offer (the "Tender Offer") by Newco for the Target Stock followed by a
merger (the "Merger") of Newco with and into the Target (collectively, the
"Two-Step Acquisition") or (b) directly through the Merger (the "One-Step
Acquisition"), in each case for a price per share of $50. In that connection,
you have requested that CSI agree to structure, arrange and syndicate senior
credit facilities in an aggregate amount of up to $1,825,000,000 (the
"Facilities"), and that Chase commit to provide the Facilities and to serve as
administrative agent for the Facilities. References herein to the "Transaction"
shall include the Acquisition and the financings described herein and all
transactions related thereto.

                     CSI is pleased to advise you that it is willing to act as
advisor, lead arranger and book manager for the Facilities.

                     Furthermore, Chase is pleased to advise you of its
commitment to provide the entire amount of the Facilities upon the terms and
subject to the conditions set forth or referred to in this commitment letter
(the "Commitment Letter") and in the respective Summaries of Terms and
Conditions attached hereto as Exhibit A and B (the "Term Sheets"). The Term
Sheet attached as Exhibit A describes the Facilities as they would apply in the
case of a Two-Step Acquisition, and the Term Sheet attached as Exhibit B
describes the Facilities as they would apply in the case of a One-Step
Acquisition.


                                       9
<PAGE>
                     It is agreed that Chase will act as the exclusive
administrative agent, and that CSI will act as an advisor, lead arranger and
book manager, for the Facilities, and each will, in such capacities, perform the
duties and exercise the authority customarily performed and exercised by it in
such roles. You and we agree that no other agents, co-agents or arrangers will
be appointed, no other titles will be awarded and no compensation (other than
that expressly contemplated by the relevant Term Sheet and the Fee Letter
referred to below) will be paid in connection with the Facilities without mutual
consultation and agreement among you, Chase and CSI.

                     We intend to syndicate the Facilities to a group of
financial institutions (together with Chase, the "Lenders") identified by us and
you. The timing, and any staging, of the syndication efforts would be determined
by CSI in consultation with you, and you agree actively to assist CSI in
completing a syndication satisfactory to it. Such assistance shall include (a)
your using commercially reasonable efforts to ensure that the syndication
efforts benefit materially from your existing lending relationships and, to the
extent possible, the existing lending relationships of the Target, (b) direct
contact between senior management and advisors of International Specialty
Products Inc. (the "Parent"), the Borrower and the proposed Lenders, (c)
assistance in the preparation of a Confidential Information Memorandum and other
marketing materials to be used in connection with the syndication and (d) the
hosting, with CSI, of one or more meetings of prospective Lenders.

                     In cooperation with you, CSI will manage the syndication,
including decisions to be made with you as to the selection of institutions to
be approached and when they will be approached, when their commitments will be
accepted, which institutions will participate, the allocations of the
commitments among the Lenders and the amount and distribution of fees among the
Lenders. To assist CSI in its syndication efforts, you agree promptly to prepare
and provide to CSI and Chase all information with respect to Parent, the
Borrower, the Target and the Transaction, including all financial information
and projections (the "Projections"), as we may reasonably request in connection
with the arrangement and syndication of the Facilities. You hereby represent and
covenant that (a) all information other than the Projections (the "Information")
that has been or will be made available to Chase or CSI by you or any of your
representatives is or will be, when furnished, complete and correct in all
material respects and does not or will not, when furnished, contain any untrue
statement of a material fact or omit to state a material fact necessary in order
to make the statements contained therein not materially misleading in light of
the circumstances under which such statements are made and (b) the Projections
that have been or will be made available to Chase or CSI by you or any of your
representatives have been or will be prepared in good faith based upon
reasonable assumptions. Chase and CSI acknowledge that, unless additional
information is made available by the Target, all information with respect to the
Target provided by you will be information made publicly available by the
Target. You understand that in arranging and syndicating the Facilities we may
use and rely on the Information and Projections without independent verification
thereof.

                     As consideration for Chase's commitment hereunder and CSI's
agreement to perform the services described herein, you agree to pay to Chase
the nonrefundable fees set forth in Annex I to the relevant Term Sheet and in
the Fee Letter dated the date hereof and delivered herewith (the "Fee Letter").

                     Chase's commitment hereunder and CSI's agreement to perform
the services described herein are subject to (a) there not occurring or becoming
known to us any material adverse condition or material adverse change in or
affecting the business, operations or financial condition of the Borrower and
its subsidiaries, taken as a whole, or the Target and its subsidiaries, taken as
a whole, (b) our not becoming aware after the date hereof of any information or


                                       10
<PAGE>
other matter (including any matter relating to financial models and underlying
assumptions relating to the Projections) affecting Parent or the Target or their
respective subsidiaries or the Transaction that in our reasonable judgment is
inconsistent in a material and adverse manner with any such information or other
matter disclosed to us prior to the date hereof, (c) there not having occurred a
material disruption of or material adverse change in financial, banking or
capital market conditions that, in our judgment, could materially impair the
syndication of the Facilities, (d) our satisfaction that prior to and during the
syndication of the Facilities there shall be no competing offering, placement or
arrangement of any material debt securities or bank financing by or on behalf of
the Parent or any of its subsidiaries, (e) the negotiation, execution and
delivery of definitive documentation with respect to the Facilities reasonably
satisfactory to Chase and its counsel on or before October 31, 2000 (or, in the
case of a One-Step Acquisition, on or before December 31, 2000, provided that
Chase has completed on or before October 31, 2000 its syndication of the
Facilities), (f) the Borrower having delivered a notice (the "Closing Notice")
to Chase and CSI at least 30 days prior to the Tender Closing Date or Closing
Date (each as defined in the relevant Term Sheet), as applicable, to the effect
that the Tender Closing Date or the Closing Date, as applicable, may occur on or
after such 30th day and (g) the other conditions set forth or referred to in the
relevant Term Sheet. Any matters that are not covered by the provisions hereof
and of the relevant Term Sheet are subject to the approval and agreement of
Chase, CSI and the Borrower.

                     You agree (a) to indemnify and hold harmless Chase, CSI,
their affiliates and their respective officers, directors, employees,
advisors, and agents (each, an "Indemnified Person") from and against any and
all losses, claims, damages and liabilities to which any such Indemnified Person
may become subject arising out of or in connection with this Commitment Letter,
the Facilities, the use of the proceeds thereof, the Transaction or any claim,
litigation, investigation or proceeding relating to any of the foregoing,
regardless of whether any Indemnified Person is a party thereto, and to
reimburse each Indemnified Person upon demand for any reasonable and documented
legal or other expenses incurred in connection with investigating or defending
any of the foregoing, provided that the foregoing indemnity will not, as to any
Indemnified Person, apply to losses, claims, damages, liabilities or related
expenses to the extent they are found by a final, non-appealable judgment of a
court to arise from the bad faith, willful misconduct or gross negligence of
such Indemnified Person, breach of law or agreement with the Parent or its
subsidiaries ("Non-Indemnifiable Losses"), and (b) to reimburse Chase, CSI and
their affiliates on demand for all reasonable and documented out-of-pocket
expenses (including due diligence expenses, syndication expenses, consultant's
fees and expenses, travel expenses, and reasonable fees, charges and
disbursements of counsel) incurred in connection with the Facilities and any
related documentation (including this Commitment Letter, the Term Sheets, the
Fee Letter and the definitive financing documentation) or the administration,
amendment, modification or waiver thereof. No Indemnified Person shall be liable
for any damages arising from the use by unauthorized persons of Information or
other materials sent through electronic, telecommunications or other information
transmission systems that are intercepted by such persons or for any special,
indirect, consequential or punitive damages in connection with the Facilities,
except to the extent arising from a Non-Indemnifiable Loss.

                     You acknowledge that Chase and its affiliates (the term
"Chase" as used below in this paragraph being understood to include such
affiliates) may be providing debt financing, equity capital or other services
(including financial advisory services) to other companies in respect of which
you may have conflicting interests regarding the Transaction and otherwise.
Chase will not use confidential information obtained from you by virtue of the
Transaction or its other relationships with you in connection with the
performance by Chase of services for other companies, and Chase will not furnish
any such information to other companies. You also acknowledge that Chase has no


                                       11
<PAGE>
obligation to use in connection with the Transaction, or to furnish to you,
confidential information obtained from other companies.

                     This Commitment Letter shall not be assignable by you
without the prior written consent of Chase and CSI (and any purported
assignment without such consent shall be null and void), is intended to be
solely for the benefit of the parties hereto and is not intended to confer any
benefits upon, or create any rights in favor of, any person other than the
parties hereto and the Indemnified Persons. This Commitment Letter may not be
amended or waived except by an instrument in writing signed by you, Chase and
CSI. This Commitment Letter may be executed in any number of counterparts, each
of which shall be an original, and all of which, when taken together, shall
constitute one agreement. Delivery of an executed signature page of this
Commitment Letter by facsimile transmission shall be effective as delivery of a
manually executed counterpart hereof. This Commitment Letter, the Term Sheets,
the Fee Letter, the "highly confident letter" and the related indemnification
agreement are the only agreements that have been entered into among us with
respect to the Facilities and set forth the entire understanding of the parties
with respect thereto. This Commitment Letter shall be governed by, and construed
in accordance with, the laws of the State of New York.

                     This Commitment Letter is delivered to you on the
understanding that neither this Commitment Letter, the Term Sheets or the Fee
Letter nor any of their terms or substance shall be disclosed, directly or
indirectly, to any other person except (a) to your officers directors,
employees, agents, consultants and advisors who are directly involved in the
consideration of this matter or (b) as may be compelled in a judicial or
administrative proceeding or as otherwise required by applicable law, rules and
regulations, including, without limitation, tender offer rules and regulations
(in which case you agree to inform us promptly thereof), provided, that the
foregoing restrictions shall cease to apply (except in respect of the Fee Letter
and its terms and substance) after this Commitment Letter has been accepted by
you.

                     The compensation, reimbursement, indemnification and
confidentiality provisions contained herein and in the Fee Letter shall remain
in full force and effect regardless of whether definitive financing
documentation shall be executed and delivered and notwithstanding the
termination of this Commitment Letter or Chase's commitment hereunder.

                     If the foregoing correctly sets forth our agreement, please
indicate your acceptance of the terms hereof and of the Term Sheets and
the Fee Letter by returning to us executed counterparts hereof and of the Fee
Letter, together with the amounts agreed upon pursuant to the Fee Letter to be
payable upon the acceptance hereof, not later than 5:00 p.m., New York City
time, on March 31, 2000. Chase's commitment and CSI's agreements herein will
expire at such time in the event Chase has not received such executed
counterparts and such amounts in accordance with the immediately preceding
sentence.




                                       12
<PAGE>
                     Chase and CSI are pleased to have been given the
opportunity to assist you in connection with this important financing.

                                        Very truly yours,

                                        THE CHASE MANHATTAN BANK


                                        By: /s/ Peter Dedousis
                                            ----------------------------------
                                            Name: Peter Dedousis
                                            Title: Managing Director



                                        CHASE SECURITIES INC.

                                        By: /s/ Christopher Iannaccone
                                            ----------------------------------
                                            Name: Christopher Iannaccone
                                            Title: Managing Director



Accepted and agreed to
as of the date first
written above by:

ISP OPCO HOLDINGS INC.

By: /s/ Susan B. Yoss
    ----------------------------------
    Name: Susan B. Yoss
    Title: Senior Vice President
            and Treasurer











                                       13
<PAGE>
                                                                      Exhibit A


                            SENIOR CREDIT FACILITIES

                         Summary of Terms and Conditions

                                 March 23, 2000
                          -----------------------------

                     ISP Opco Holdings Inc., a Delaware corporation (the
"Borrower"), will require credit facilities in order to finance the acquisition
(the "Acquisition") by a newly formed direct or indirect wholly-owned subsidiary
of the Borrower ("Newco") of all of the outstanding capital stock (the "Target
Stock") of Dexter Corporation, a Connecticut corporation (the "Target"). The
Transaction will be effected either (a) through a tender offer (the "Tender
Offer") by Newco for the Target Stock followed by a merger (the "Merger") of
Newco with and into the Target (collectively, the "Two-Step Acquisition") or (b)
directly through the Merger (the "One-Step Acquisition"), in each case for a
price per share of $50. In that connection, you have requested that CSI agree to
structure, arrange and syndicate senior credit facilities in an aggregate amount
of up to $1,825,000,000 (the "Facilities"), and that Chase commit to provide the
Facilities and to serve as administrative agent for the Facilities. This is the
Summary of Terms and Conditions for the Facilities in the event that the
Transaction will be effected as a "Two-Step Acquisition". References herein to
the "Transaction" shall include the Acquisition and the financings described
herein and all transactions related thereto.

I.         Parties

Borrower:                     ISP Opco Holdings Inc.

Guarantors:                   ISP Chemicals Inc., ISP Technologies Inc. and
                              Newco and each of the other existing and future
                              direct and indirect domestic wholly owned
                              subsidiaries of International Specialty Products
                              Inc. (the "Parent"), including the Target and its
                              wholly owned domestic subsidiaries after the
                              Target becomes a wholly owned direct or indirect
                              subsidiary of the Parent (the "Guarantors"; the
                              Borrower and the Guarantors, collectively, the
                              "Loan Parties"). The Parent shall also become a
                              Guarantor if at the Tender Closing Date or the
                              Merger Closing Date (each as defined below) in the
                              reasonable judgment of the Parent its Indenture
                              would unquestionably permit it to become a
                              Guarantor.

Advisor, Lead Arranger
and Book Manager:             Chase Securities Inc. (in such capacity, the
                              "Arranger").

Administrative Agent:         The Chase Manhattan Bank ("Chase" and, in such
                              capacity, the "Administrative Agent").

Other Agents:                 To be determined.

Lenders:                      A syndicate of banks, financial institutions and
                              other entities, including Chase (collectively, the
                              "Lenders").


                                       14
<PAGE>
II.        Types and Amounts of Credit Facilities

A.         Tender Facilities

1.         Tender Term Facility

Type and Amount of
Facility:                     Nine-month term loan facility (the "Tender Term
                              Facility") in an amount to be determined (the
                              loans thereunder, the "Tender Term Loans").


Availability:                 The Tender Term Loans shall be made in multiple
                              drawings and in minimum amounts to be determined,
                              during the period commencing on the Tender Closing
                              Date (as defined below) and ending on the earlier
                              of the date nine months thereafter and the date of
                              the consummation of the Merger (the "Tender
                              Termination Date").

Amortization:                 The Tender Term Loans shall be repayable on the
                              Tender Termination Date.

Purpose:                      The proceeds of the Tender Term Loans shall be
                              used to finance the Tender Offer, to refinance
                              existing indebtedness of the Target and its
                              subsidiaries by means of intercompany loans and to
                              pay related fees and expenses.


2.         Tender Revolving Facility

Type and Amount of
Facility:                     Nine-month revolving credit facility (the "Tender
                              Revolving Facility"; together with the Tender Term
                              Facility, the "Tender Facilities") in an amount to
                              be determined (the loans thereunder, the "Tender
                              Revolving Loans").

Availability:                 The Tender Revolving Facility shall be available
                              on a revolving basis during the period commencing
                              on the Tender Closing Date and ending on the
                              Tender Termination Date.

Letters of Credit:            A portion of the Tender Revolving Facility not in
                              excess of $75,000,000 shall be available for the
                              issuance of letters of credit (the "Tender Letters
                              of Credit") by Chase or, subject to certain
                              restrictions, any other Lenders designated by the
                              Borrower (in such capacity, the "Issuing
                              Lenders"). No Tender Letter of
                              Credit shall have an expiration date after the
                              date that is five business days prior to the
                              Tender Termination Date, provided that Tender
                              Letters of Credit as to which the Borrower agrees
                              to post cash collateral on the Tender Termination
                              Date (if the Merger Closing Date does not occur)
                              may have an expiration date of up to 12 months


                                       15
<PAGE>
                              from the date of issuance and may then be
                              continued as Merger Letters of Credit under the
                              Merger Revolving Facility (as such terms are
                              defined below).

                              Drawings under any Tender Letter of Credit shall
                              be reimbursed by the Borrower (whether with its
                              own funds or with the proceeds of Tender Revolving
                              Loans) on the same business day. To the extent
                              that the Borrower does not so reimburse the
                              Issuing Lender, the Lenders under the Tender
                              Revolving Facility shall be irrevocably and
                              unconditionally obligated to reimburse such
                              Issuing Lender on a pro rata basis.

Swingline Loans:              A portion of the Tender Revolving Facility
                              not in excess of $5,000,000 shall be available for
                              swingline loans (the "Tender Swingline Loans")
                              from Chase (in such capacity, the "Swingline
                              Lender") on same-day notice. Any such Tender
                              Swingline Loans will reduce availability under the
                              Tender Revolving Facility on a dollar-for-dollar
                              basis. Each Lender under the Tender Revolving
                              Facility shall acquire, under certain
                              circumstances, an irrevocable and unconditional
                              pro rata participation in each Tender Swingline
                              Loan.

Maturity:                     The Tender Termination Date.

Purpose:                      The proceeds of the Tender Revolving Loans and the
                              Tender Letters of Credit shall be used to finance
                              the Transaction, to refinance existing
                              indebtedness of the Borrower and its subsidiaries
                              (including under the $400,000,000 credit
                              agreement, dated as of July 26, 1996, among ISP
                              Chemicals Inc., ISP Technologies Inc., the Parent,
                              certain subsidiaries of the Parent, the lenders
                              named therein and Chase, as agent (the "Existing
                              Credit Agreement")) and to finance the working
                              capital needs and general corporate purposes of
                              the Borrower and its subsidiaries in the ordinary
                              course of business.


B.         Merger Facilities

1.         Merger Term I Facility

Type and Amount of
Facility:                     Seven-year term loan facility (the "Merger Term I
                              Facility") in an amount to be determined (the
                              loans thereunder, the "Merger Term I Loans").


Availability:                 The Merger Term I Loans shall be made in a single
                              drawing on the Merger Closing Date (as defined
                              below).


                                       16
<PAGE>
Amortization:                 The Merger Term I Loans shall be repayable in
                              consecutive semi-annual installments, commencing
                              on a date approximately 18 months after the Merger
                              Closing Date (the "First Installment Date"), in an
                              aggregate amount for each date to be agreed.

Purpose:                      The proceeds of the Merger Term I Loans shall be
                              used to finance the Transaction, to refinance
                              existing indebtedness of the Borrower and the
                              Target and their subsidiaries (including under the
                              Tender Facilities) and to pay related fees and
                              expenses.


2.         Merger Revolving Facility

Type and Amount of
Facility:                     Seven-year revolving credit facility (the "Merger
                              Revolving Facility") in an amount to be determined
                              (the loans thereunder, the "Merger Revolving
                              Loans"; together with the Tender Revolving Loans,
                              the "Revolving Loans").

Availability:                 The Merger Revolving Facility shall be available
                              on a revolving basis during the period commencing
                              on the Merger Closing Date and ending on the
                              seventh anniversary thereof (the "Merger Revolving
                              Termination Date").

Letters of Credit:            A portion of the Merger Revolving Facility not in
                              excess of $75,000,000 shall be available for the
                              issuance of Letters of Credit (the "Merger Letters
                              of Credit"; together with the Tender Letters of
                              Credit, the "Letters of Credit") by the Issuing
                              Lenders. No Merger Letter of Credit shall have an
                              expiration date after the earlier of (a) 12 months
                              after the date of issuance and (b) five business
                              days prior to the Merger Revolving Termination
                              Date, provided that any Merger Letter of Credit
                              may provide for the renewal thereof for additional
                              periods of up to 12 months (which shall in no
                              event extend beyond the date referred to in clause
                              (b) above).

                              Drawings under any Merger Letter of Credit shall
                              be reimbursed by the Borrower (whether with its
                              own funds or with the proceeds of Merger Revolving
                              Loans) on the same business day. To the extent
                              that the Borrower does not so reimburse the
                              Issuing Lender, the Lenders under the Merger
                              Revolving Facility shall be irrevocably and
                              unconditionally obligated to reimburse such
                              Issuing Lender on a pro rata basis.

Swingline Loans:              A portion of the Merger Revolving Facility not in
                              excess of $5,000,000 shall be available for
                              swingline loans (the "Merger Swingline Loans";
                              together with the Tender Swingline Loans, the
                              "Swingline Loans") from the Swingline Lender on


                                       17
<PAGE>
                              same-day notice. Any such Merger Swingline Loans
                              will reduce availability under the Merger
                              Revolving Facility on a dollar-for-dollar basis.
                              Each Lender under the Merger Revolving Facility
                              shall acquire, under certain circumstances, an
                              irrevocable and unconditional pro rata
                              participation in each Merger Swingline Loan.

Competitive Loans:            After the repayment in full of the Merger Term II
                              Loans (as defined below), the Borrower shall have
                              the option under the Merger Revolving Facility to
                              request that the Lenders bid for loans
                              ("Competitive Loans") bearing interest at an
                              absolute rate or a margin over the eurodollar
                              rate, with specified maturities ranging from 7 to
                              360 days. Each Lender shall have the right, but
                              not the obligation, to submit bids at its
                              discretion. The Borrower, by notice given four
                              business days in advance in the case of eurodollar
                              rate bids and one business day in advance in the
                              case of absolute rate bids, shall specify the
                              proposed date of borrowing, the interest period,
                              the amount of the Competitive Loan and the
                              maturity date thereof, the interest rate basis to
                              be used by the Lenders in bidding and such other
                              terms as the Borrower may specify. The
                              Administrative Agent shall advise the Lenders of
                              the terms of the Borrower's notice, and, subject
                              to acceptance by the Borrower, bids shall be
                              allocated to each Lender in ascending order from
                              the lowest bid to the highest bid acceptable to
                              the Borrower. While Competitive Loans are
                              outstanding, the available commitments under the
                              Merger Revolving Facility shall be reduced by the
                              aggregate amount of such Competitive Loans.

Maturity:                     The Merger Revolving Termination Date.

Purpose:                      The proceeds of the Merger Revolving Loans and the
                              Merger Letters of Credit shall be used to finance
                              the Transaction, to refinance existing
                              indebtedness of the Borrower and the Target and
                              their subsidiaries (including the Tender
                              Facilities) and to finance the working capital
                              needs and general corporate purposes of the
                              Borrower and its subsidiaries in the ordinary
                              course of business.


3.         Merger Term II Facility


Type and Amount of
Facility:                     An 18-month term loan facility (the "Merger Term
                              II Facility"; together with the Merger Term I
                              Facility and the Merger Revolving Facility, the
                              "Merger Facilities" and, together with the Tender
                              Facilities, the "Facilities") in an aggregate
                              principal amount to be determined (the loans


                                       18
<PAGE>
                              thereunder, the "Merger Term II Loans"). The
                              Merger Term II Loans shall be repayable on the
                              date that is 18 months after the Merger Closing
                              Date.

Availability:                 The Merger Term II Loans shall be made in a single
                              drawing on the Merger Closing Date.

Purpose:                      The proceeds of the Merger Term II Loans shall be
                              used to finance the Transaction, to refinance
                              existing indebtedness of the Borrower and the
                              Target and their subsidiaries and to pay related
                              fees and expenses.



III.       Certain Payment Provisions

Fees and Interest Rates:      As set forth on Annex I.

Optional Prepayments and
Commitment Reductions:        Loans may be prepaid and commitments may be
                              reduced by the Borrower in minimum amounts to be
                              agreed upon, provided that Competitive Loans may
                              not be prepaid without the consent of the relevant
                              Lender. Each of the Merger Term I Loans and the
                              Merger Term II Loans may also be optionally
                              prepaid, and optional prepayments of the Merger
                              Term I Loans shall be applied, first, at the
                              option of the Borrower to the next two succeeding
                              installments thereof and, thereafter, ratably to
                              the remaining installments thereof. Optional
                              prepayments of the Tender Term Loans, the Merger
                              Term I Loans and the Merger Term II Loans may not
                              be reborrowed. Optional reductions of the Tender
                              Term Facility and prepayments of the Tender Term
                              Loans shall be applied to correspondingly reduce
                              the commitments for the Merger Term I Facility and
                              the Merger Term II Facility in a manner determined
                              by the Borrower. Optional reductions of the Tender
                              Revolving Facility shall correspondingly reduce
                              the commitments for the Merger Revolving Facility.

Mandatory Prepayments and
Commitment                    Reductions: The following amounts shall be applied
                              (i) until the Merger Closing Date, to prepay the
                              Tender Term Loans (and to correspondingly reduce
                              the commitments for the Merger Term I Facility and
                              the Merger Term II Facility) and to reduce the
                              Tender Revolving Facility (and to correspondingly
                              reduce the commitments for the Merger Revolving
                              Facility) and (ii) thereafter, to prepay the
                              Merger Term I Loans and the Merger Term II Loans
                              and reduce the Merger Revolving Facility as set
                              forth below:

                              (a) until the Merger Term II Loans have been fully
                              prepaid, 50% of the net proceeds of any sale or
                              issuance of equity, and 100% of the net proceeds


                                       19
<PAGE>
                              of any issuance or incurrence of certain
                              indebtedness, after the Tender Closing Date by
                              Parent or the Borrower or any of its subsidiaries
                              (subject to certain exceptions to be agreed on);
                              and

                              (b) 100% (until the Merger Term II Loans have been
                              fully prepaid) or 50% (thereafter) of the net
                              proceeds of any sale or other disposition
                              (including as a result of casualty or
                              condemnation) by Parent or the Borrower or any of
                              its subsidiaries of any assets (except for the
                              sale of inventory in the ordinary course of
                              business and certain other dispositions to be
                              agreed on, including dispositions for aggregate
                              net proceeds of up to $20,000,000 (until the
                              Merger Term II Loans have been fully prepaid) or
                              $100,000,000 (thereafter)).

                              All such amounts shall be applied, first, to the
                              prepayment of the Tender Term Loans (and the
                              corresponding reduction of the commitments for the
                              Merger Term I Facility and the Merger Term II
                              Facility) or of the Merger Term I Loans and the
                              Merger Term II Loans, as the case may be, in an
                              order to be agreed and, second, to the permanent
                              reduction of the Tender Revolving Facility (and
                              the corresponding reduction of the commitments for
                              the Merger Revolving Facility) or the Merger
                              Revolving Facility, as the case may be.

                              Any prepayments to be applied to the Merger Term I
                              Loans shall be applied ratably to the remaining
                              installments thereof. Mandatory prepayments of the
                              Tender Term Loans, the Merger Term I Loans and the
                              Merger Term II Loans may not be reborrowed.

                              The Tender Revolving Loans or the Merger Revolving
                              Loans shall be prepaid and the Letters of Credit
                              shall be cash collateralized or replaced to the
                              extent such extensions of credit exceed the amount
                              of the Tender Revolving Facility or the Merger
                              Revolving Facility, as the case may be.

Special Mandatory Prepayment
and Commitment Termination:   All Loans shall be prepaid and the Facilities
                              shall be terminated upon a sale or transfer of the
                              specialty chemicals business of the Borrower and
                              its subsidiaries.


IV.        Collateral         The obligations of each Loan Party in respect of
                              the Facilities and any interest rate or other
                              permitted swap liabilities with any Lender (or any
                              affiliate of a Lender) shall be secured by a
                              perfected first priority security interest in (i)
                              all of the capital stock of each of the direct and
                              indirect existing and future domestic subsidiaries


                                       20
<PAGE>
                              of the Borrower and 65% of the capital stock of
                              first-tier foreign subsidiaries of the Borrower,
                              (ii) all existing and future capital stock of the
                              Target and Life Technologies Inc. ("LifeTech")
                              owned by the Borrower and each of the direct and
                              indirect subsidiaries of the Borrower, including
                              the capital stock of the Target and LifeTech owned
                              by the Borrower and its subsidiaries (other than
                              the Target) before the Merger and owned by the
                              Borrower and its subsidiaries (including the
                              Target) thereafter and (iii) all intercompany
                              loans (other than short-term advances in the
                              ordinary course of business).

                              The foregoing collateral shall be released upon
                              the occurrence of certain events to be agreed.


V.         Certain Conditions

Initial Tender Conditions:    The availability of the Tender Facilities shall be
                              conditioned upon satisfaction of, among other
                              things, the following conditions precedent (the
                              date upon which all such conditions precedent
                              shall be satisfied, the "Tender Closing Date") on
                              or before October 31, 2000:

                              (a) Each Loan Party shall have executed and
                              delivered definitive financing documentation with
                              respect to the Facilities reasonably satisfactory
                              to the Administrative Agent and its counsel (the
                              "Credit Documentation").

                              (b) The Tender Offer shall have been consummated
                              in accordance with applicable law and pursuant to
                              an offer to purchase and other documentation
                              reasonably satisfactory to the Administrative
                              Agent (including as to the maximum price per share
                              and the minimum share tender condition), and no
                              provision of such documentation (including as to
                              the maximum price per share and the minimum share
                              tender condition) shall have been waived, amended,
                              supplemented or otherwise modified in any material
                              respect. The existing indebtedness of the Borrower
                              and its subsidiaries contemplated to be repaid
                              shall have been repaid on satisfactory terms, and
                              the Existing Credit Agreement shall have been
                              terminated. The capital structure of each Loan
                              Party shall be reasonably satisfactory to the
                              Administrative Agent.

                              (c) No shareholders rights plan or statutory
                              provision that would impede or limit consummation
                              of the Tender Offer or the Merger in the proposed
                              manner shall be in effect, and any material
                              conditions or requirements to or for the
                              consummation of the Merger shall have been
                              satisfied or shall be reasonably capable of being
                              satisfied.


                                       21
<PAGE>
                              (d) The Tender Facilities shall be in compliance
                              with the margin regulations of the Board of
                              Governors of the Federal Reserve System and
                              appropriate forms with respect thereto shall have
                              been provided.

                              (e) The Lenders, the Administrative Agent and the
                              Arranger shall have received all fees required to
                              be paid, and reimbursement for all expenses for
                              which invoices have been presented required to be
                              reimbursed, on or before the Tender Closing Date.

                              (f) All governmental and third party approvals
                              necessary or, in the reasonable discretion of the
                              Administrative Agent, advisable in connection with
                              the Tender Offer, the financing contemplated
                              hereby and the continuing operations of Parent and
                              its subsidiaries shall have been obtained and be
                              in full force and effect, and all applicable
                              waiting periods shall have expired without any
                              action being taken or threatened by any competent
                              authority that would restrain, prevent or
                              otherwise impose material adverse conditions on
                              the Tender Offer or the Merger or the financing
                              thereof.

                              (g) The Lenders shall have received (i)
                              satisfactory audited consolidated financial
                              statements of the Borrower and the Target for the
                              two most recent fiscal years ended prior to the
                              Tender Closing Date as to which such financial
                              statements are available and (ii) satisfactory
                              unaudited interim consolidated financial
                              statements of the Borrower and the Target for each
                              quarterly period ended subsequent to the date of
                              the latest financial statements delivered pursuant
                              to clause (i) of this paragraph as to which such
                              financial statements are available. Such financial
                              statements of the Target shall only be required to
                              the extent publicly available.

                              (h) The Lenders shall have received and be
                              reasonably satisfied with the pro forma
                              consolidated balance sheet of Holdings as at the
                              date of the most recent consolidated balance sheet
                              delivered pursuant to paragraph (g) above,
                              adjusted to give effect to the consummation of the
                              Transaction and the financings contemplated hereby
                              as if such transactions had occurred on such date.

                              (i) The Lenders shall have received and be
                              reasonably satisfied with financial projections
                              (including the assumptions upon which such
                              projections are based) for Holdings and its
                              subsidiaries for the period from the Tender
                              Closing Date through the final maturity of the
                              Term Loans.

                              (j) The Lenders shall have received the results of
                              a recent lien search in each relevant jurisdiction
                              with respect to the Borrower and its subsidiaries,


                                       22
<PAGE>
                              and such search shall reveal no liens on any of
                              the assets of either the Borrower or its
                              subsidiaries except for liens permitted by the
                              Credit Documentation or liens to be discharged on
                              or prior to the Closing Date pursuant to
                              documentation reasonably satisfactory to the
                              Administrative Agent.

                              (k) The Lenders shall be reasonably satisfied with
                              the sufficiency of amounts available under the
                              Tender Revolving Facility to meet the ongoing
                              working capital needs of the Borrower and its
                              subsidiaries following the Tender Offer and the
                              consummation of the other transactions
                              contemplated hereby.

                              (l) The Lenders shall be reasonably satisfied with
                              the tax sharing arrangements among the Parent and
                              its subsidiaries.

                              (m) The Lenders shall have received such legal
                              opinions (including opinions (i) from counsel to
                              the Borrower (which shall include an opinion to
                              the effect that the public indebtedness of Parent
                              may remain outstanding after the Tender Offer and
                              the Merger and the financings contemplated
                              hereby), (ii) if any, delivered to any Loan Party
                              by counsel to the Target, accompanied by reliance
                              letters in favor of the Lenders (to the extent
                              agreed to by such counsel) and (iii) from such
                              special and local counsel as may be reasonably
                              required by the Administrative Agent), documents
                              and other instruments as are customary for
                              transactions of this type or as they may
                              reasonably request.

Initial Merger Conditions:    The availability of the Merger Facilities shall be
                              conditioned upon satisfaction of, among other
                              things, the following conditions precedent (the
                              date upon which all such conditions precedent
                              shall be satisfied, the "Merger Closing Date") on
                              or before the date nine months after the Tender
                              Closing Date (with references to the Borrower and
                              its subsidiaries in this paragraph being deemed to
                              refer to and include the Target and its
                              subsidiaries after giving effect to the
                              Transaction):

                              (a) The conditions to the availability of the
                              Tender Facilities shall have been satisfied or
                              waived, and the Tender Term Loans shall have been
                              made.

                              (b) The Merger shall have been consummated in
                              accordance with applicable law and pursuant to a
                              merger agreement and other documentation
                              reasonably satisfactory to the Administrative
                              Agent, and no provision of such documentation
                              shall have been waived, amended, supplemented or
                              otherwise modified in any material respect. The


                                       23
<PAGE>
                              existing indebtedness of the Borrower and its
                              subsidiaries contemplated to be repaid (including
                              under the Tender Facilities) shall have been
                              repaid, or arrangements for the repayment thereof
                              shall have been made, on satisfactory terms. The
                              capital structure of each Loan Party shall be
                              reasonably satisfactory to the Administrative
                              Agent.

                              (c) No shareholders rights plan or statutory
                              provision that would impede or limit consummation
                              of the Merger in the proposed manner shall be in
                              effect.

                              (d) The Lenders, the Administrative Agent and the
                              Arranger shall have received all fees required to
                              be paid, and reimbursement for all expenses for
                              which invoices have been presented required to be
                              reimbursed, on or before the Merger Closing Date.

                              (e) All governmental and third party approvals
                              necessary or, in the reasonable discretion of the
                              Administrative Agent, advisable in connection with
                              the Merger, the financing contemplated hereby and
                              the continuing operations of Parent and its
                              subsidiaries shall have been obtained and be in
                              full force and effect, and all applicable waiting
                              periods shall have expired without any action
                              being taken or threatened by any competent
                              authority that would restrain, prevent or
                              otherwise impose material adverse conditions on
                              the Transaction or the financing thereof.

                              (f) The Lenders shall have received such legal
                              opinions (including opinions (i) from counsel to
                              the Borrower (which shall include an opinion to
                              the effect that the public indebtedness of Parent
                              may remain outstanding), (ii) if any, delivered to
                              any Loan Party by counsel to the Target,
                              accompanied by reliance letters in favor of the
                              Lenders (to the extent agreed to by such counsel)
                              and (iii) from such special and local counsel as
                              may be reasonably required by the Administrative
                              Agent), documents and other instruments as are
                              customary for transactions of this type or as they
                              may reasonably request.

On-Going Conditions:          The making of each extension of credit shall be
                              conditioned upon (a) the accuracy in all material
                              respects of all representations and warranties in
                              the Credit Documentation (including, without
                              limitation, the material adverse change and
                              litigation representations) and (b) there being no
                              default or event of default in existence at the
                              time of, or after giving effect to the making of,
                              such extension of credit. As used herein and in
                              the Credit Documentation a "material adverse
                              change" shall mean any event, development or
                              circumstance that has had or could reasonably be
                              expected to have a material adverse effect on (a)
                              the Transaction, (b) the business, operations or


                                       24
<PAGE>
                              financial condition of the Borrower and its
                              subsidiaries taken as a whole or (c) the validity
                              or enforceability of any of the Credit
                              Documentation or the rights and remedies of the
                              Administrative Agent and the Lenders thereunder.


VI.        Certain Documentation Matters

                              The Credit Documentation shall contain
                              representations, warranties, covenants and events
                              of default customary for financings of this type
                              and other terms deemed reasonably appropriate by
                              the Lenders, including, without limitation:

Representations and
Warranties:                   Representations and warranties substantially
                              similar to those in the Existing Credit Agreement
                              (corporate existence; financial condition
                              (including pro forma financial statements);
                              litigation; no breach; action; approvals; use of
                              credit; ERISA; taxes; Investment Company Act;
                              Public Utility Holding Company Act; Indebtedness
                              and Liens; hazardous materials; subsidiaries;
                              patents, trademarks, etc.; and property); and,
                              additionally, representations and warranties
                              relating to solvency; and creation and perfection
                              of security interests.

Affirmative Covenants:        Affirmative covenants substantially similar to
                              those in the Existing Credit Agreement (delivery
                              of financial statements, reports, accountants'
                              letters, projections, officers' certificates and
                              other information requested by the Lenders;
                              notices of defaults, litigation and other material
                              events; continuation of business and maintenance
                              of existence and material rights and privileges;
                              compliance with laws; maintenance of property and
                              insurance; maintenance of books and records; right
                              of the Lenders to inspect property and books and
                              records; and use of proceeds); and, additionally,
                              affirmative covenants relating to further
                              assurances (including, without limitation, with
                              respect to security interests in after-acquired
                              property); and agreement to promptly consummate
                              the Merger after the Tender Closing Date.

Financial Covenants:          Financial covenants as follows (with initial
                              levels and step-ups and step-downs to be agreed):

                              (a) A minimum ratio of EBITDA to interest expense
                              for each four-quarter period (or such shorter
                              period since the first day of the first quarter
                              commencing on or following the Tender Closing
                              Date).


                                       25
<PAGE>
                              (b) A maximum ratio of consolidated debt at the
                              end of each quarter to EBITDA for the four-quarter
                              period then ended.

                              The definition of "EBITDA" shall exclude certain
                              one-time charges to be agreed upon and shall
                              include for a period to be determined the pro
                              forma effect of certain synergies to be agreed
                              upon and the definition of "interest expense"
                              shall exclude the amortization of upfront costs
                              associated with the Facilities.

Negative Covenants:           Negative covenants of a type substantially similar
                              to those in the Existing Credit Agreement
                              (limitations on indebtedness (including guarantee
                              obligations); investments, loans and advances;
                              mergers, consolidations, liquidations and
                              dissolutions; liens (including liens relating to
                              accounts receivable financings); dividends and
                              other payments in respect of capital stock
                              ("Restricted Payments"); Linden property; changes
                              in lines of business; transactions with
                              affiliates; amendments to other documents;
                              designated subsidiaries; and unfriendly
                              acquisitions); and, additionally, sale and
                              leasebacks; and changes in passive holding company
                              status of Parent. The limitation on Restricted
                              Payments shall comply with the covenants in the
                              Parent's Indenture. The terms of the following
                              negative covenants shall depend on whether the
                              collateral has been released and the Merger Term
                              II Loans have been repaid in full:

                              (i) indebtedness -- prior thereto, to include only
                              a limited basket to be agreed upon and,
                              thereafter, to be substantially similar to those
                              in the Existing Credit Agreement;

                              (ii) investments, loans and advances -- prior
                              thereto, to include a total limitation of only
                              $50,000,000 and, thereafter, to be substantially
                              similar to those in the Existing Credit Agreement,
                              with certain adjustments to be agreed;

                              (iii) mergers, consolidations, liquidations and
                              dissolutions -- prior thereto, to be very limited
                              and, thereafter, to be substantially similar to
                              those in the Existing Credit Agreement;

                              (iv) liens -- prior thereto, to be very limited
                              and, thereafter, to be substantially similar to
                              those in the Existing Credit Agreement; and

                              (v) sale and leasebacks -- prior thereto, not to
                              exceed $100,000,000 cumulatively and, thereafter,
                              not to be specifically limited. Events of Default:


                                       26
<PAGE>
                              Events of default substantially similar to those
                              in the Existing Credit Agreement (nonpayment of
                              principal when due; nonpayment of interest, fees
                              or other amounts after a grace period of three
                              days; cross-default; material inaccuracy of
                              representations and warranties; violation of
                              covenants (subject, in the case of certain
                              affirmative covenants, to a grace period);
                              insolvency; bankruptcy events; material judgments;
                              certain ERISA events; certain environmental
                              events; change of control; and change in tax
                              consolidation); and, additionally, actual or
                              asserted invalidity of any guarantee or security
                              document or security interest.

Voting:                       Amendments and waivers with respect to the Credit
                              Documentation shall require the approval of
                              Lenders holding not less than a majority of the
                              aggregate amount of the Credit Facilities, except
                              that (a) the consent of each Lender directly
                              affected thereby shall be required with respect to
                              (i) reductions in the amount or extensions of the
                              scheduled date of amortization or maturity of any
                              Loan, (ii) reductions in the rate of interest or
                              any fee or extensions of any due date thereof and
                              (iii) increases in the amount or extensions of the
                              expiry date of any Lender's commitment and (b) the
                              consent of 100% of the Lenders shall be required
                              with respect to (i) modifications to any of the
                              voting percentages and (ii) releases of all or
                              substantially all of the Guarantors or all or
                              substantially all of the collateral, except as
                              otherwise expressly provided. In addition, "class"
                              voting requirements will apply to modifications
                              affecting certain payment matters.

Assignments
and Participations:           The Lenders shall be permitted to assign and sell
                              participations in their loans under each Facility
                              (the "Loans") and commitments, subject, in the
                              case of assignments (other than to another Lender
                              (which shall be another Revolving Credit Lender,
                              in the case of an assignment under the Revolving
                              Credit Facility) or to an affiliate of a Lender),
                              to the consent of the Administrative Agent and the
                              Borrower (which consent in each case shall not be
                              unreasonably withheld). A $3,500 administrative
                              fee shall be paid to the Administrative Agent in
                              connection with each assignment. Non-pro rata
                              assignments shall be permitted. In the case of
                              partial assignments (other than to another Lender
                              or to an affiliate of a Lender), the minimum
                              assignment amount shall be $5,000,000, and, after
                              giving effect thereto, the assigning Lender shall
                              have commitments and Loans aggregating at least
                              $5,000,000, unless otherwise agreed by the
                              Borrowers and the Administrative Agent.
                              Participants shall have the same benefits as the
                              Lenders with respect to yield protection and
                              increased cost provisions. Voting rights of


                                       27
<PAGE>
                              participants shall be limited to those matters
                              with respect to which the affirmative vote of the
                              Lender from which it purchased its participation
                              would be required as described under "Voting"
                              above. Pledges of Loans in accordance with
                              applicable law shall be permitted without
                              restriction. Promissory notes shall be issued
                              under the Credit Facilities only upon request.

Yield Protection:             The Credit Documentation shall contain customary
                              provisions (a) protecting the Lenders against
                              increased costs or loss of yield resulting from
                              changes in reserve, tax, capital adequacy and
                              other requirements of law and from the imposition
                              of or changes in withholding or other taxes and
                              (b) indemnifying the Lenders for "breakage costs"
                              incurred in connection with, among other things,
                              any prepayment of a Eurodollar Loan (as defined in
                              Annex I) on a day other than the last day of an
                              interest period with respect thereto.

Expenses and
Indemnification:              The Borrowers shall pay (a) all reasonable and
                              documented out-of-pocket expenses of the
                              Administrative Agent and the Arranger associated
                              with the syndication of the Credit Facilities and
                              the preparation, execution, delivery and
                              administration of the Credit Documentation and any
                              amendment or waiver with respect thereto
                              (including the reasonable fees, disbursements and
                              other charges of counsel) and (b) all reasonable
                              and documented out-of-pocket expenses of the
                              Administrative Agent and the Lenders (including
                              the reasonable and documented fees, disbursements
                              and other charges of counsel) in connection with
                              the enforcement of the Credit Documentation.

                              The Administrative Agent, the Arranger and the
                              Lenders (and their affiliates and their respective
                              officers, directors, employees, advisors and
                              agents) will have no liability for, and will be
                              indemnified and held harmless against, any losses,
                              claims, damages, liabilities or reasonable and
                              documented expenses incurred in respect of the
                              financing contemplated hereby or the use or the
                              proposed use of proceeds thereof, except to the
                              extent they are found by a final, non-appealable
                              judgment of a court to arise from the bad faith,
                              gross negligence or willful misconduct of the
                              indemnified party or breach of applicable law or
                              agreement with the Parent.

Governing Law and Forum:      State of New York.

Counsel to the
Administrative Agent
and the Arranger:             Simpson Thacher & Bartlett.


                                       28
<PAGE>
                                                                       Annex I

                            Interest and Certain Fees

Interest Rate Options:        The Borrower may elect that the Loans (other than
                              Competitive Loans) comprising each borrowing bear
                              interest at a rate per annum equal to:

                                 the ABR plus the Applicable Margin; or

                                 the Eurodollar Rate plus the Applicable Margin;

                              provided that all Swingline Loans shall bear
                              interest based upon the ABR.

                              As used herein:

                              "ABR" means the higher of (i) the rate of interest
                              publicly announced by Chase as its prime rate in
                              effect at its principal office in New York City
                              (the "Prime Rate") and (ii) the federal funds
                              effective rate from time to time plus 0.5%.

                              "Applicable Margin" means (a) with respect to the
                              Tender Term Loans and the Tender Revolving Loans,
                              (i) 1.50% in the case of ABR Loans (as defined
                              below) and (ii) 2.50% in the case of Eurodollar
                              Loans (as defined below), (b) with respect to the
                              Merger Term I Loans and the Merger Revolving
                              Loans, a percentage determined in accordance with
                              the pricing grid attached to the Fee Letter as
                              Annex I thereto and (c) with respect to the Merger
                              Term II Loans, (i) 1.50% in the case of ABR Loans
                              and (ii) 2.50%, in the case of Eurodollar Loans.

                              "Eurodollar Rate" means the rate (adjusted for
                              statutory reserve requirements for eurocurrency
                              liabilities) for eurodollar deposits for a period
                              equal to one, two, three or six months (as
                              selected by the Borrower) appearing on Page 3750
                              of the Telerate screen.

Interest Payment Dates:       In the case of Loans bearing interest based upon
                              the ABR ("ABR Loans"), quarterly in arrears.


                              In the case of Loans bearing interest based upon
                              the Eurodollar Rate ("Eurodollar Loans"), on the
                              last day of each relevant interest period and, in
                              the case of any interest period longer than three
                              months, on each successive date three months after
                              the first day of such interest period.


                                       29
<PAGE>


Commitment Fees:              The Borrower shall pay a commitment fee on the
                              average daily unused portion of (a) until the
                              Merger Closing Date, the Tender Revolving Facility
                              and the Tender Term Facility and (b) thereafter,
                              the Merger Revolving Facility, payable quarterly
                              in arrears. The commitment fee rate shall be 0.50%
                              per annum until the Merger Closing Date and
                              thereafter a percentage determined in accordance
                              with the pricing grid attached to the Fee Letter
                              as Annex I thereto. In determining the average
                              daily unused portion of the Tender Revolving
                              Facility or the Merger Revolving Facility,
                              Swingline Loans and Competitive Loans shall be
                              treated as though they were not outstanding.

Letter of Credit Fees:        The Borrower shall pay a fee on all outstanding
                              Letters of Credit at a per annum rate equal to the
                              Applicable Margin then in effect with respect to
                              Eurodollar Loans under the Tender Revolving
                              Facility or the Merger Revolving Facility, as the
                              case may be, on the face amount of each such
                              Letter of Credit. Such fee shall be shared ratably
                              among the Lenders participating in such Facility
                              and shall be payable quarterly in arrears.

                              A fronting fee equal to 0.25% per annum on the
                              face amount of each Letter of Credit shall be
                              payable quarterly in arrears to the Issuing Lender
                              thereof for its own account. In addition,
                              customary administrative, issuance, amendment,
                              payment and negotiation charges shall be payable
                              to such Issuing Lender for its own account.

Default Rate:                 At any time when the Borrower is in default in the
                              payment of any amount of principal due under the
                              Facilities, such amount shall bear interest at 2%
                              above the rate otherwise applicable thereto.
                              Overdue interest, fees and other amounts shall
                              bear interest at 2% above the rate applicable to
                              ABR Loans.

Rate and Fee Basis:           All per annum rates shall be calculated on the
                              basis of a year of 360 days (or 365/366 days, in
                              the case of ABR Loans the interest rate payable on
                              which is then based on the Prime Rate) for actual
                              days elapsed.



                                       30
<PAGE>
                                                                     Exhibit B

                            SENIOR CREDIT FACILITIES

                         Summary of Terms and Conditions

                                 March 23, 2000
                              ---------------------

                     ISP Opco Holdings Inc., a Delaware corporation (the
"Borrower"), will require credit facilities in order to finance the acquisition
(the "Acquisition") by a newly formed direct or indirect wholly-owned subsidiary
of the Borrower ("Newco") of all the outstanding capital stock (the "Target
Stock") of Dexter Corporation, a Connecticut corporation (the "Target"). The
Transaction will be effected either (a) through a tender offer (the "Tender
Offer") by Newco for the Target Stock followed by a merger (the "Merger") of
Newco with and into the Target (collectively, the "Two-Step Acquisition") or (b)
directly through the Merger (the "One-Step Acquisition"), in each case for a
price per share of $50. In that connection, you have requested that CSI agree to
structure, arrange and syndicate senior credit facilities in an aggregate amount
of up to $1,825,000,000 (the "Facilities"), and that Chase commit to provide the
Facilities and to serve as administrative agent for the Facilities. This is the
Summary of Terms and Conditions for the Facilities in the event that the
Transaction will be effected as a One-Step Acquisition. References herein to the
"Transaction" shall include the Acquisition and the financings described herein
and all transactions related thereto.

I.         Parties

Borrower:                     ISP Opco Holdings Inc.

Guarantors:                   ISP Chemicals Inc., ISP Technologies Inc. and
                              Newco and each of the other existing and future
                              direct and indirect domestic wholly owned
                              subsidiaries of International Specialty Products
                              Inc. (the "Parent"), including the Target and its
                              wholly owned domestic subsidiaries after the
                              Target becomes a wholly owned direct or indirect
                              subsidiary of the Parent (the "Guarantors"; the
                              Borrower and the Guarantors, collectively, the
                              "Loan Parties"). The Parent shall also become a
                              Guarantor if at the Closing Date (as defined
                              below) in the reasonable judgment of the Parent
                              its Indenture would unquestionably permit it to
                              become a Guarantor.

Advisor, Lead Arranger
and Book Manager:             Chase Securities Inc. (in such capacity, the
                              "Arranger").


Administrative Agent:         The Chase Manhattan Bank ("Chase" and, in such
                              capacity, the "Administrative Agent").

Other Agents:                 To be determined.


                                       31
<PAGE>
Lenders:                      A syndicate of banks, financial institutions and
                              other entities, including Chase (collectively, the
                              "Lenders").



II.        Types and Amounts of Credit Facilities

A.         Term I Facility

Type and Amount of
Facility:                     Seven-year term loan facility (the "Term I
                              Facility") in an amount to be determined (the
                              loans thereunder, the "Term I Loans").

Availability:                 The Term I Loans shall be made in a single drawing
                              on the Closing Date (as defined below).

Amortization:                 The Term I Loans shall be repayable in consecutive
                              semi-annual installments, commencing on a date
                              approximately 18 months after the Closing Date
                              (the "First Installment Date"), in an aggregate
                              amount for each date to be agreed.

Purpose:                      The proceeds of the Term I Loans shall be used to
                              finance the Transaction, to refinance existing
                              indebtedness of the Borrower and the Target and
                              their subsidiaries and to pay related fees and
                              expenses.

B.         Revolving Facility

Type and Amount of
Facility:                     Seven-year revolving credit facility (the
                              "Revolving Facility") in an amount to be
                              determined (the loans thereunder, the "Revolving
                              Loans").


Availability:                 The Revolving Facility shall be available on a
                              revolving basis during the period commencing on
                              the Closing Date and ending on the seventh
                              anniversary thereof (the "Revolving Termination
                              Date").

Letters of Credit:            A portion of the Revolving Facility not in excess
                              of $75,000,000 shall be available for the issuance
                              of letters of credit (the "Letters of Credit") by
                              Chase or, subject to certain restrictions, any
                              other Lenders designated by the Borrower (in such
                              capacity, the "Issuing Lenders"). No Letter of
                              Credit shall have an expiration date after the
                              earlier of (a) 12 months after the date of
                              issuance and (b) five business days prior to the
                              Revolving Termination Date, provided that any
                              Letter of Credit may provide for the renewal
                              thereof for additional periods of up to 12 months
                              (which shall in no event extend beyond the date
                              referred to in clause (b) above).


                                       32
<PAGE>
                              Drawings under any Letter of Credit shall be
                              reimbursed by the Borrower (whether with its own
                              funds or with the proceeds of Revolving Loans) on
                              the same business day. To the extent that the
                              Borrower does not so reimburse the Issuing Lender,
                              the Lenders under the Revolving Facility shall be
                              irrevocably and unconditionally obligated to
                              reimburse such Issuing Lender on a pro rata basis.

Swingline Loans:              A portion of the Revolving Facility not in excess
                              of $5,000,000 shall be available for swingline
                              loans (the "Swingline Loans") from Chase (in such
                              capacity, the "Swingline Lender") on same-day
                              notice. Any such Swingline Loans will reduce
                              availability under the Revolving Facility on a
                              dollar-for-dollar basis. Each Lender under the
                              Revolving Facility shall acquire, under certain
                              circumstances, an irrevocable and unconditional
                              pro rata participation in each Swingline Loan.

Competitive Loans:            After the repayment in full of the Term II Loans
                              (as defined below), the Borrower shall have the
                              option under the Revolving Facility to request
                              that the Lenders bid for loans ("Competitive
                              Loans") bearing interest at an absolute rate or a
                              margin over the eurodollar rate, with specified
                              maturities ranging from 7 to 360 days. Each Lender
                              shall have the right, but not the obligation, to
                              submit bids at its discretion. The Borrower, by
                              notice given four business days in advance in the
                              case of eurodollar rate bids and one business day
                              in advance in the case of absolute rate bids,
                              shall specify the proposed date of borrowing, the
                              interest period, the amount of the Competitive
                              Loan and the maturity date thereof, the interest
                              rate basis to be used by the Lenders in bidding
                              and such other terms as the Borrower may specify.
                              The Administrative Agent shall advise the Lenders
                              of the terms of the Borrower's notice, and,
                              subject to acceptance by the Borrower, bids shall
                              be allocated to each Lender in ascending order
                              from the lowest bid to the highest bid acceptable
                              to the Borrower. While Competitive Loans are
                              outstanding, the available commitments under the
                              Revolving Facility shall be reduced by the
                              aggregate amount of such Competitive Loans.

Maturity:                     The Revolving Termination Date.

Purpose:                      The proceeds of the Revolving Loans and the
                              Letters of Credit shall be used to finance the
                              Transaction, to refinance existing indebtedness of
                              the Borrower and the Target and their subsidiaries
                              (including under the $400,000,000 credit
                              agreement, dated as of July 26, 1996, among ISP
                              Chemicals Inc., ISP Technologies Inc., the Parent,
                              certain subsidiaries of the Parent, the lenders
                              named therein and Chase, as agent (the "Existing
                              Credit Agreement")) and to finance the working


                                       33
<PAGE>
                              capital needs and general corporate purposes of
                              the Borrower and its subsidiaries in the ordinary
                              course of business.


C.         Term II Facility

Type and Amount of
Facility:                     An 18-month term loan facility (the "Term II
                              Facility"; together with the Term I Facility and
                              the Revolving Facility, the "Facilities") in an
                              aggregate principal amount to be determined (the
                              loans thereunder, the "Term II Loans"). The Term
                              II Loans shall be repayable on the date that is 18
                              months after the Closing Date.

Availability:                 The Term II Loans shall be made in a single
                              drawing on the Closing Date.

Purpose:                      The proceeds of the Term II Loans shall be used to
                              finance the Transaction, to refinance existing
                              indebtedness of the Borrower and the Target and
                              their subsidiaries and to pay related fees and
                              expenses.


III.       Certain Payment Provisions

Fees and Interest Rates:      As set forth on Annex I.

Optional Prepayments and
Commitment Reductions:        Loans may be prepaid and commitments may be
                              reduced by the Borrower in minimum amounts to be
                              agreed upon, provided that Competitive Loans may
                              not be prepaid without the consent of the relevant
                              Lender. Each of the Term I Loans and the Term II
                              Loans may also be optionally prepaid, and optional
                              prepayments of the Term I Loans shall be applied,
                              first, at the option of the Borrower to the next
                              two succeeding installments thereof and,
                              thereafter, ratably to the remaining installments
                              thereof. Optional prepayments of the Term I Loans
                              and the Term II Loans may not be reborrowed.

Mandatory Prepayments and
Commitment Reductions:        The following amounts shall be applied to prepay
                              the Term I Loans and the Term II Loans and reduce
                              the Revolving Facility as set forth below:

                              (a) until the Term II Loans have been fully
                              prepaid, 50% of the net proceeds of any sale or
                              issuance of equity, and 100% of the net proceeds
                              of any issuance or incurrence of certain
                              indebtedness, by Parent or the Borrower or any of


                                       34
<PAGE>
                              its subsidiaries (subject to certain exceptions to
                              be agreed on); and

                              (b) 100% (until the Term II Loans have been fully
                              prepaid) or 50% (thereafter) of the net proceeds
                              of any sale or other disposition (including as a
                              result of casualty or condemnation) by Parent or
                              the Borrower or any of its subsidiaries of any
                              assets (except for the sale of inventory in the
                              ordinary course of business and certain other
                              dispositions to be agreed on, including
                              dispositions for aggregate net proceeds of up to
                              $20,000,000 (until the Term II Loans have been
                              fully prepaid) or $100,000,000 (thereafter)).

                              All such amounts shall be applied, first, to the
                              prepayment of the Term I Loans and the Term II
                              Loans, in an order to be agreed and, second, to
                              the permanent reduction of the Revolving Facility.

                              Any prepayments to be applied to the Term I Loans
                              shall be applied ratably to the remaining
                              installments thereof. Mandatory prepayments of the
                              Term I Loans and the Term II Loans may not be
                              reborrowed.

                              The Revolving Loans shall be prepaid and the
                              Letters of Credit shall be cash collateralized or
                              replaced to the extent such extensions of credit
                              exceed the amount of the Revolving Facility.

Special Mandatory Prepayment
and Commitment Termination:   All Loans shall be prepaid and the Facilities
                              shall be terminated upon a sale or transfer of the
                              specialty chemicals business of the Borrower and
                              its subsidiaries.


IV.        Collateral         The obligations of each Loan Party in respect of
                              the Facilities and any interest rate or other
                              permitted swap liabilities with any Lender (or any
                              affiliate of a Lender) shall be secured by a
                              perfected first priority security interest in (i)
                              all of the capital stock of each of the direct and
                              indirect existing and future domestic subsidiaries
                              of the Borrower and 65% of the capital stock of
                              first-tier foreign subsidiaries of the Borrower,
                              (ii) all existing and future capital stock of the
                              Target and Life Technologies, Inc. ("LifeTech")
                              owned by the Borrower and each of the direct and
                              indirect subsidiaries of the Borrower and (iii)
                              all intercompany loans (other than short-term
                              advances in the ordinary course of business). The
                              foregoing collateral shall be released upon the
                              occurrence of certain events to be agreed.


                                       35
<PAGE>
V.         Certain Conditions

       Initial Conditions:    The availability of the Facilities shall be
                              conditioned upon satisfaction of, among other
                              things, the following conditions precedent (the
                              date upon which all such conditions precedent
                              shall be satisfied, the "Closing Date") on or
                              before January 31, 2001 (with references to the
                              Borrower and its subsidiaries in this paragraph
                              being deemed to refer to and include the Target
                              and its subsidiaries after giving effect to the
                              Merger):

                              (a) Each Loan Party shall have executed and
                              delivered definitive financing documentation with
                              respect to the Facilities reasonably satisfactory
                              to the Administrative Agent and its counsel (the
                              "Credit Documentation") on or prior to December
                              31, 2000.

                              (b) The Merger shall have been consummated in
                              accordance with applicable law and pursuant to a
                              merger agreement and other documentation
                              reasonably satisfactory to the Administrative
                              Agent, and no provision of such documentation
                              shall have been waived, amended, supplemented or
                              otherwise modified in any material respect. The
                              existing indebtedness of the Borrower and its
                              subsidiaries contemplated to be repaid shall have
                              been repaid, or arrangements for the repayment
                              thereof shall have been made, on satisfactory
                              terms, and the Existing Credit Agreement shall
                              have been terminated. The capital structure of
                              each Loan Party shall be reasonably satisfactory
                              to the Administrative Agent.

                              (c) No shareholders rights plan or statutory
                              provision that would impede or limit consummation
                              of the Merger in the proposed manner shall be in
                              effect, and any material conditions or
                              requirements to or for the consummation of the
                              Merger shall have been satisfied or shall be
                              reasonably capable of being satisfied.

                              (d) The Lenders, the Administrative Agent and the
                              Arranger shall have received all fees required to
                              be paid, and reimbursement for all expenses for
                              which invoices have been presented required to be
                              reimbursed, on or before the Closing Date.

                              (e) All governmental and third party approvals
                              necessary or, in the reasonable discretion of the
                              Administrative Agent, advisable in connection with
                              the Merger, the financing contemplated hereby and
                              the continuing operations of Parent and its
                              subsidiaries shall have been obtained and be in
                              full force and effect, and all applicable waiting
                              periods shall have expired without any action
                              being taken or threatened by any competent


                                       36
<PAGE>
                              authority that would restrain, prevent or
                              otherwise impose material adverse conditions on
                              the Merger or the financing thereof.

                              (f) The Lenders shall have received (i)
                              satisfactory audited consolidated financial
                              statements of the Borrower and the Target for the
                              two most recent fiscal years ended prior to the
                              Closing Date as to which such financial statements
                              are available and (ii) satisfactory unaudited
                              interim consolidated financial statements of the
                              Borrower and the Target for each quarterly period
                              ended subsequent to the date of the latest
                              financial statements delivered pursuant to clause
                              (i) of this paragraph as to which such financial
                              statements are available. Such financial
                              statements of the Target shall only be required to
                              the extent publicly available.

                              (g) The Lenders shall have received and be
                              reasonably satisfied with the pro forma
                              consolidated balance sheet of Holdings as at the
                              date of the most recent consolidated balance sheet
                              delivered pursuant to paragraph (f) above,
                              adjusted to give effect to the consummation of the
                              Transaction and the financings contemplated hereby
                              as if such transactions had occurred on such date.

                              (h) The Lenders shall have received and be
                              reasonably satisfied with financial projections
                              (including the assumptions upon which such
                              projections are based) for Holdings and its
                              subsidiaries for the period from the Closing Date
                              through the final maturity of the Term Loans.

                              (i) The Lenders shall have received the results of
                              a recent lien search in each relevant jurisdiction
                              with respect to the Borrower and its subsidiaries,
                              and such search shall reveal no liens on any of
                              the assets of either the Borrower or its
                              subsidiaries except for liens permitted by the
                              Credit Documentation or liens to be discharged on
                              or prior to the Closing Date pursuant to
                              documentation reasonably satisfactory to the
                              Administrative Agent.

                              (j) The Lenders shall be reasonably satisfied with
                              the sufficiency of amounts available under the
                              Revolving Facility to meet the ongoing working
                              capital needs of the Borrower and its subsidiaries
                              following the Merger and the consummation of the
                              other transactions contemplated hereby.

                              (k) The Lenders shall be reasonably satisfied with
                              the tax sharing arrangements among the Parent and
                              its subsidiaries.


                                       37
<PAGE>
                              (l) The Lenders shall have received such legal
                              opinions (including opinions (i) from counsel to
                              the Borrower (which shall include an opinion to
                              the effect that the public indebtedness of Parent
                              may remain outstanding after the Merger and the
                              financings contemplated hereby), (ii) if any,
                              delivered to any Loan Party by counsel to the
                              Target, accompanied by reliance letters in favor
                              of the Lenders (to the extent agreed to by such
                              counsel) and (iii) from such special and local
                              counsel as may be reasonably required by the
                              Administrative Agent), documents and other
                              instruments as are customary for transactions of
                              this type or as they may reasonably request.



On-Going Conditions:          The making of each extension of credit shall be
                              conditioned upon (a) the accuracy in all material
                              respects of all representations and warranties in
                              the Credit Documentation (including, without
                              limitation, the material adverse change and
                              litigation representations) and (b) there being no
                              default or event of default in existence at the
                              time of, or after giving effect to the making of,
                              such extension of credit. As used herein and in
                              the Credit Documentation a "material adverse
                              change" shall mean any event, development or
                              circumstance that has had or could reasonably be
                              expected to have a material adverse effect on (a)
                              the Transaction, (b) the business, operations or
                              financial condition of the Borrower and its
                              subsidiaries taken as a whole or (c) the validity
                              or enforceability of any of the Credit
                              Documentation or the rights and remedies of the
                              Administrative Agent and the Lenders thereunder.


VI.        Certain Documentation Matters

                              The Credit Documentation shall contain
                              representations, warranties, covenants and events
                              of default customary for financings of this type
                              and other terms deemed reasonably appropriate by
                              the Lenders, including, without limitation:

Representations and
Warranties:                   Representations and warranties substantially
                              similar to those in the Existing Credit Agreement
                              (corporate existence; financial condition
                              (including pro forma financial statements);
                              litigation; no breach; action; approvals; use of
                              credit; ERISA; taxes; Investment Company Act;
                              Public Utility Holding Company Act; Indebtedness
                              and Liens; hazardous materials; subsidiaries;
                              patents, trademarks, etc.; and property); and,
                              additionally, representations and warranties
                              relating to solvency; and creation and perfection
                              of security interests.


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<PAGE>
Affirmative Covenants:        Affirmative covenants substantially similar to
                              those in the Existing Credit Agreement (delivery
                              of financial statements, reports, accountants'
                              letters, projections, officers' certificates and
                              other information requested by the Lenders;
                              notices of defaults, litigation and other material
                              events; continuation of business and maintenance
                              of existence and material rights and privileges;
                              compliance with laws; maintenance of property and
                              insurance; maintenance of books and records; right
                              of the Lenders to inspect property and books and
                              records; and use of proceeds); and, additionally,
                              affirmative covenants relating to further
                              assurances (including, without limitation, with
                              respect to security interests in after-acquired
                              property); and agreement to promptly consummate
                              the Merger after the Closing Date.

Financial Covenants:          Financial covenants as follows (with initial
                              levels and step-ups and step-downs to be agreed):

                              (a) A minimum ratio of EBITDA to interest expense
                              for each four-quarter period (or such shorter
                              period since the first day of the first quarter
                              commencing on or following the Closing Date).

                              (b) A maximum ratio of consolidated debt at the
                              end of each quarter to EBITDA for the four-quarter
                              period then ended.

                              The definition of "EBITDA" shall exclude certain
                              one-time charges to be agreed upon and shall
                              include for a period to be determined the pro
                              forma effect of certain synergies to be agreed
                              upon and the definition of "interest expense"
                              shall exclude the amortization of upfront costs
                              associated with the Facilities.

Negative Covenants:           Negative covenants of a type substantially similar
                              to those in the Existing Credit Agreement
                              (limitations on indebtedness (including guarantee
                              obligations); investments, loans and advances;
                              mergers, consolidations, liquidations and
                              dissolutions; liens (including liens relating to
                              accounts receivable financings); dividends and
                              other payments in respect of capital stock
                              ("Restricted Payments"); Linden property; changes
                              in lines of business; transactions with
                              affiliates; amendments to other documents;
                              designated subsidiaries; and unfriendly
                              acquisitions); and, additionally, sale and
                              leasebacks; and changes in passive holding company
                              status of Parent. The limitation on Restricted
                              Payments shall comply with the covenants in the
                              Parent's Indenture. The terms of the following
                              negative covenants shall depend on whether the
                              collateral has been released and the Term II Loans
                              have been repaid in full:


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<PAGE>
                              (i) indebtedness -- prior thereto, to include only
                              a limited basket to be agreed upon and,
                              thereafter, to be substantially similar to those
                              in the Existing Credit Agreement;

                              (ii) investments, loans and advances -- prior
                              thereto, to include a total limitation of only
                              $50,000,000 and, thereafter, to be substantially
                              similar to those in the Existing Credit Agreement,
                              with certain adjustments to be agreed.

                              (iii) mergers, consolidations, liquidations and
                              dissolutions -- prior thereto, to be very limited
                              and, thereafter, to be substantially similar to
                              those in the Existing Credit Agreement;

                              (iv) liens -- prior thereto, to be very limited
                              and, thereafter, to be substantially similar to
                              those in the Existing Credit Agreement; and

                              (v) sale and leasebacks -- prior thereto, not to
                              exceed $100,000,000 cumulatively and, thereafter,
                              not to be specifically limited.

Events of Default:            Events of default substantially similar to those
                              in the Existing Credit Agreement (nonpayment of
                              principal when due; nonpayment of interest, fees
                              or other amounts after a grace period of three
                              days; cross-default; material inaccuracy of
                              representations and warranties; violation of
                              covenants (subject, in the case of certain
                              affirmative covenants, to a grace period);
                              insolvency; bankruptcy events; material judgments;
                              certain ERISA events; certain environmental
                              events; change of control; and change in tax
                              consolidation); and, additionally, actual or
                              asserted invalidity of any guarantee or security
                              document or security interest.

Voting:                       Amendments and waivers with respect to the Credit
                              Documentation shall require the approval of
                              Lenders holding not less than a majority of the
                              aggregate amount of the Credit Facilities, except
                              that (a) the consent of each Lender directly
                              affected thereby shall be required with respect to
                              (i) reductions in the amount or extensions of the
                              scheduled date of amortization or maturity of any
                              Loan, (ii) reductions in the rate of interest or
                              any fee or extensions of any due date thereof and
                              (iii) increases in the amount or extensions of the
                              expiry date of any Lender's commitment and (b) the
                              consent of 100% of the Lenders shall be required
                              with respect to (i) modifications to any of the
                              voting percentages and (ii) releases of all or
                              substantially all of the Guarantors or all or
                              substantially all of the collateral, except as
                              otherwise expressly provided. In addition, "class"


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<PAGE>

                              voting requirements will apply to modifications
                              affecting certain payment matters.

Assignments
and Participations:           The Lenders shall be permitted to assign and sell
                              participations in their loans under each Facility
                              (the "Loans") and commitments, subject, in the
                              case of assignments (other than to another Lender
                              (which shall be another Revolving Credit Lender,
                              in the case of an assignment under the Revolving
                              Credit Facility) or to an affiliate of a Lender),
                              to the consent of the Administrative Agent and the
                              Borrower (which consent in each case shall not be
                              unreasonably withheld). A $3,500 administrative
                              fee shall be paid to the Administrative Agent in
                              connection with each assignment. Non-pro rata
                              assignments shall be permitted. In the case of
                              partial assignments (other than to another Lender
                              or to an affiliate of a Lender), the minimum
                              assignment amount shall be $5,000,000, and, after
                              giving effect thereto, the assigning Lender shall
                              have commitments and Loans aggregating at least
                              $5,000,000, unless otherwise agreed by the
                              Borrowers and the Administrative Agent.
                              Participants shall have the same benefits as the
                              Lenders with respect to yield protection and
                              increased cost provisions. Voting rights of
                              participants shall be limited to those matters
                              with respect to which the affirmative vote of the
                              Lender from which it purchased its participation
                              would be required as described under "Voting"
                              above. Pledges of Loans in accordance with
                              applicable law shall be permitted without
                              restriction. Promissory notes shall be issued
                              under the Credit Facilities only upon request.

Yield Protection:             The Credit Documentation shall contain customary
                              provisions (a) protecting the Lenders against
                              increased costs or loss of yield resulting from
                              changes in reserve, tax, capital adequacy and
                              other requirements of law and from the imposition
                              of or changes in withholding or other taxes and
                              (b) indemnifying the Lenders for "breakage costs"
                              incurred in connection with, among other things,
                              any prepayment of a Eurodollar Loan (as defined in
                              Annex I) on a day other than the last day of an
                              interest period with respect thereto.

Expenses and
Indemnification:              The Borrowers shall pay (a) all reasonable and
                              documented out-of-pocket expenses of the
                              Administrative Agent and the Arranger associated
                              with the syndication of the Credit Facilities and
                              the preparation, execution, delivery and
                              administration of the Credit Documentation and any
                              amendment or waiver with respect thereto
                              (including the reasonable fees, disbursements and
                              other charges of counsel) and (b) all reasonable
                              and documented out-of-pocket expenses of the


                                       41
<PAGE>
                              Administrative Agent and the Lenders (including
                              the reasonable and documented fees, disbursements
                              and other charges of counsel) in connection with
                              the enforcement of the Credit Documentation.

                              The Administrative Agent, the Arranger and the
                              Lenders (and their affiliates and their respective
                              officers, directors, employees, advisors and
                              agents) will have no liability for, and will be
                              indemnified and held harmless against, any losses,
                              claims, damages, liabilities or reasonable and
                              documented expenses incurred in respect of the
                              financing contemplated hereby or the use or the
                              proposed use of proceeds thereof, except to the
                              extent they are found by a final, non-appealable
                              judgment of a court to arise from the bad faith,
                              gross negligence or willful misconduct of the
                              indemnified party or breach of applicable law or
                              agreement with the Parent.

Governing Law and Forum:      State of New York.

Counsel to the
Administrative Agent
and the Arranger:             Simpson Thacher & Bartlett.







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<PAGE>
                                                                       Annex I

                            Interest and Certain Fees
                            -------------------------


Interest Rate Options:        The Borrower may elect that the Loans (other than
                              Competitive Loans) comprising each borrowing bear
                              interest at a rate per annum equal to:

                                 the ABR plus the Applicable Margin; or

                                 the Eurodollar Rate plus the Applicable Margin;

                              provided that all Swingline Loans shall bear
                              interest based upon the ABR.

                              As used herein:

                              "ABR" means the higher of (i) the rate of interest
                              publicly announced by Chase as its prime rate in
                              effect at its principal office in New York City
                              (the "Prime Rate") and (ii) the federal funds
                              effective rate from time to time plus 0.5%.

                              "Applicable Margin" means (a) with respect to the
                              Term I Loans and the Revolving Loans, a percentage
                              determined in accordance with the pricing grid
                              attached to the Fee Letter as Annex II thereto and
                              (b) with respect to the Term II Loans, (i) 1.50%
                              in the case of ABR Loans and (ii) 2.50%, in the
                              case of Eurodollar Loans.

                              "Eurodollar Rate" means the rate (adjusted for
                              statutory reserve requirements for eurocurrency
                              liabilities) for eurodollar deposits for a period
                              equal to one, two, three or six months (as
                              selected by the Borrower) appearing on Page 3750
                              of the Telerate screen.

Interest Payment Dates:       In the case of Loans bearing interest based upon
                              the ABR ("ABR Loans"), quarterly in arrears.


                              In the case of Loans bearing interest based upon
                              the Eurodollar Rate ("Eurodollar Loans"), on the
                              last day of each relevant interest period and, in
                              the case of any interest period longer than three
                              months, on each successive date three months after
                              the first day of such interest period.

Commitment Fees:              The Borrower shall pay a commitment fee on the
                              average daily unused portion of the Facilities,
                              payable quarterly in arrears. The commitment fee
                              rate shall be 0.50% per annum until the Closing
                              Date and thereafter a percentage determined in
                              accordance with the pricing grid attached to the


                                       43
<PAGE>
                              Fee Letter as Annex II thereto. In determining the
                              average daily unused portion of the Revolving
                              Facility, Swingline Loans and Competitive Loans
                              shall be treated as though they were not
                              outstanding.

Letter of Credit Fees:        The Borrower shall pay a fee on all outstanding
                              Letters of Credit at a per annum rate equal to the
                              Applicable Margin then in effect with respect to
                              Eurodollar Loans under the Revolving Facility, on
                              the face amount of each such Letter of Credit.
                              Such fee shall be shared ratably among the Lenders
                              participating in such Facility and shall be
                              payable quarterly in arrears.

                              A fronting fee equal to 0.25% per annum on the
                              face amount of each Letter of Credit shall be
                              payable quarterly in arrears to the Issuing Lender
                              thereof for its own account. In addition,
                              customary administrative, issuance, amendment,
                              payment and negotiation charges shall be payable
                              to such Issuing Lender for its own account.

Default Rate:                 At any time when the Borrower is in default in the
                              payment of any amount of principal due under the
                              Facilities, such amount shall bear interest at 2%
                              above the rate otherwise applicable thereto.
                              Overdue interest, fees and other amounts shall
                              bear interest at 2% above the rate applicable to
                              ABR Loans.

Rate and Fee Basis:           All per annum rates shall be calculated on the
                              basis of a year of 360 days (or 365/366 days, in
                              the case of ABR Loans the interest rate payable on
                              which is then based on the Prime Rate) for actual
                              days elapsed.







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