NALCO CHEMICAL CO
S-3, 1998-04-20
MISCELLANEOUS CHEMICAL PRODUCTS
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<PAGE>
 
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 20, 1998
 
                                                     REGISTRATION NO. 333-
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                                ---------------
                                   FORM S-3
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
                                ---------------
                            NALCO CHEMICAL COMPANY
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
                                ---------------
               DELAWARE                              36-1520480
   (STATE OR OTHER JURISDICTION OF                (I.R.S. EMPLOYER
    INCORPORATION OR ORGANIZATION)               IDENTIFICATION NO.)
                               ONE NALCO CENTER
                        NAPERVILLE, ILLINOIS 60563-1198
                                (630) 305-1000
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                                ---------------
                              WILLIAM G. MARSHALL
                                   TREASURER
                            NALCO CHEMICAL COMPANY
                        NAPERVILLE, ILLINOIS 60563-1198
                                (630) 305-2965
(NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                                  COPIES TO:
                               DAVID A. SCHUETTE
                             MAYER, BROWN & PLATT
                           190 SOUTH LASALLE STREET
                         CHICAGO, ILLINOIS 60603-3441
                                (312) 782-0600
                                ---------------
 
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time
to time after the effective date of this Registration Statement.
 
  If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the
following box. [_]
 
  If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or
interest reinvestment plans, check the following box. [X]
 
  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]
 
  If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
 
  If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]
                        CALCULATION OF REGISTRATION FEE
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 TITLE OF EACH CLASS OF                       PROPOSED MAXIMUM    PROPOSED MAXIMUM
    SECURITIES TO BE        AMOUNT TO BE          OFFERING       AGGREGATE OFFERING       AMOUNT OF
       REGISTERED            REGISTERED*      PRICE PER UNIT**         PRICE*         REGISTRATION FEE
- ------------------------------------------------------------------------------------------------------
<S>                      <C>                 <C>                 <C>                 <C>
Debt Securities........     $400,000,000            100%            $400,000,000          $118,000
</TABLE>
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
*  If any Debt Securities are issued at an original issue discount, such
   greater amount as shall result in an aggregate offering price to the public
   which shall not exceed the amount set forth under Proposed Maximum
   Aggregate Offering Price, or if Debt Securities are issued in a foreign or
   composite currency, an equivalent amount of such foreign or composite
   currency.
** Estimated solely for the purpose of calculating the registration fee.
                                ---------------
 
  THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS
REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH
SECTION 8(A) OF THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(A), MAY DETERMINE.
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A         +
+REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE   +
+SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY  +
+OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT        +
+BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR   +
+THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE      +
+SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE    +
+UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF  +
+ANY SUCH STATE.                                                               +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
                  SUBJECT TO COMPLETION, DATED APRIL 20, 1998
 
PROSPECTUS
 
                                  $400,000,000
 
                             NALCO CHEMICAL COMPANY
 
                                DEBT SECURITIES
 
  Nalco Chemical Company, a Delaware corporation (the "Company"), intends from
time to time to issue its unsecured and unsubordinated debt securities (the
"Securities") from which the Company will receive up to an aggregate amount of
$400,000,000 in proceeds (or its equivalent in foreign currencies or currency
units). The Securities will be offered for sale in amounts, at prices and on
terms to be determined when an agreement to sell is made or at the time of
sale, as the case may be. The Securities may be sold for U.S. dollars, foreign
denominated currency or composite currency units, and principal of and any
interest on the Securities may likewise be payable in U.S. dollars, foreign
denominated currency or composite currency units. For each issue of Securities
in respect of which this Prospectus is being delivered (the "Offered
Securities"), there is an accompanying Prospectus Supplement (the "Prospectus
Supplement") that sets forth the title, designation, aggregate principal
amount, designated currency or currency units, rate (which may be fixed or
variable) or method of calculation of interest and dates for payment thereof,
maturity, priority, premium, if any, authorized denominations, initial price,
any redemption or prepayment rights at the option of the Company or the holder,
any terms for sinking fund payments, any listing on a securities exchange and
the initial public offering price, the form of the Securities (which may be in
registered or permanent global form) and other special terms of the Offered
Securities, together with the terms of the offering of the Offered Securities
and the net proceeds to the Company from the sale thereof.
 
  The Securities will be sold directly, through agents designated from time to
time, through underwriters or dealers, or through a combination of those
methods of sale. If any agents of the Company or any underwriters are involved
in the sale of the Offered Securities in respect of which this Prospectus is
being delivered, the names of such agents or underwriters and any applicable
commissions and discounts are set forth in the Prospectus Supplement.
 
                                  -----------
 
THE SECURITIES  HAVE NOT  BEEN APPROVED  OR DISAPPROVED  BY THE  SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS  THE SECURITIES
 AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION  PASSED UPON THE
 ACCURACY OR  ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION  TO THE CONTRARY
  IS A CRIMINAL OFFENSE.
 
                                  -----------
 
               The date of this Prospectus is            , 1998.
<PAGE>
 
  NO PERSON IS AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN OR INCORPORATED BY REFERENCE IN
THIS PROSPECTUS OR ANY PROSPECTUS SUPPLEMENT AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE COMPANY OR ANY UNDERWRITER. NEITHER THIS PROSPECTUS NOR ANY
PROSPECTUS SUPPLEMENT CONSTITUTES AN OFFER TO SELL OR A SOLICITATION OF AN
OFFER TO BUY ANY SECURITIES OTHER THAN THE REGISTERED SECURITIES TO WHICH IT
RELATES OR AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY SUCH
SECURITIES TO ANY PERSON IN ANY JURISDICTION TO WHOM IT IS UNLAWFUL TO MAKE
SUCH OFFER OR SOLICITATION IN SUCH JURISDICTION. NEITHER THE DELIVERY OF THIS
PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL UNDER ANY CIRCUMSTANCES CREATE
ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY
SINCE THE DATE HEREOF OR THAT THE INFORMATION CONTAINED OR INCORPORATED BY
REFERENCE HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE.
 
                             AVAILABLE INFORMATION
 
  The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information filed by the Company can be inspected and
copied at the office of the Commission at Room 1024, Judiciary Plaza, 450
Fifth Street, N.W., Washington, D.C. 20549, as well as at the Regional Offices
of the Commission at Citicorp Center, 500 West Madison Street, Suite 1400,
Chicago, Illinois 60661-2511, and Seven World Trade Center, Suite 1300, New
York, New York 10048. Copies of such information can be obtained by mail from
the Public Reference Section of the Commission at Room 1024, Judiciary Plaza,
450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed rates. The
common stock of the Company is listed on the New York Stock Exchange and
reports, proxy statements and other information concerning the Company can
also be inspected at the office of the New York Stock Exchange, 20 Broad
Street, New York, New York 10005. Such information may also be accessed
electronically by means of the Commission's home page on the World Wide Web
located at http://www.sec.gov.
 
  This Prospectus constitutes a part of a registration statement (the
"Registration Statement") filed by the Company with the Commission under the
Securities Act of 1933, as amended (the "Securities Act"). This Prospectus
omits certain of the information contained in the Registration Statement, and
reference is hereby made to the Registration Statement and to the exhibits
thereto for further information with respect to the Company and the
Securities.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
  The Company's Annual Report on Form 10-K for the fiscal year ended December
31, 1997, filed by the Company under the Exchange Act with the Commission, is
incorporated herein by reference.
 
  All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act after the date of this Prospectus and prior to the
termination of the offering of the Securities offered hereby shall be deemed
to be incorporated in this Prospectus by reference and to be a part hereof
from the date of filing of such documents. Any statement contained in a
document incorporated or deemed to be incorporated by reference herein shall
be deemed to be modified or superseded for purposes of this Prospectus to the
extent that a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus.
 
  The Company will provide, without charge, upon the written or oral request
by any person to whom this Prospectus is delivered, a copy of any or all of
the documents incorporated by reference in this Prospectus, other than
exhibits to such documents (unless such exhibits are specifically incorporated
by reference into such documents). Such requests should be directed to:
Suzzanne J. Gioimo, Secretary, Nalco Chemical Company, One Nalco Center,
Naperville, Illinois 60563-1198 (telephone (630) 305-1000).
 
                                       2
<PAGE>
 
                                  THE COMPANY
 
  Nalco Chemical Company is in the business of providing services, chemicals,
technology, equipment, and systems (monitoring and surveillance) used in water
treatment, pollution control, energy conservation, steelmaking, papermaking,
mining and mineral processing, electricity generation, other industrial
processes, and commercial building utility systems. Service chemicals are
developed, formulated, and manufactured to meet specific customer needs. They
are part of value added programs designed to help customers maintain a high
level of operating performance and efficiency in their facilities, improve the
quality of customers' end products, or help customers meet environmental
discharge limits in a cost-effective way. The Company's products are used for
purposes such as: control of scale, corrosion, foam and fouling in cooling
systems, boilers, and other equipment; clarification of water; separation of
liquids and solids; improving combustion; control of dust; lubrication and
corrosion protection in rolling, drawing and forming of metals; improving
production of pulp and qualities of paper; recovery of minerals; and
specialized process applications in a variety of industries. The quality and
on-site availability of technical expertise provided through highly qualified
personnel are very important considerations to customers. The effective use of
the Company's products requires a substantial amount of problem solving,
monitoring, and technical assistance on the part of Company employees.
 
  Service chemicals are usually marketed through the Company's own
organization because of the high degree of technical service required. The
worldwide field sales force is trained in the application and use of Nalco
service chemicals, and is supported by a marketing and research staff of
specialists in the technology and use of various Nalco service chemicals. The
Company's principal method of competition is based on quality service, product
performance and technology through safe, practical applied science.
 
                                USE OF PROCEEDS
 
  Except as otherwise set forth in the Prospectus Supplement relating to the
Offered Securities, the net proceeds to be received by the Company from the
sale of the Securities will be used for general corporate purposes, including
repayment of indebtedness, repurchase of common stock, expansion of existing
businesses and investments in related business opportunities as they may
arise. Pending such use, the net proceeds may be temporarily invested in
short-term instruments.
 
                      RATIO OF EARNINGS TO FIXED CHARGES
 
  The following table sets forth the ratio of earnings to fixed charges of the
Company for the periods indicated:
 
<TABLE>
<CAPTION>
                              YEAR ENDED DECEMBER 31,
            ----------------------------------------------------------------------------------------
            1997           1996                  1995                  1994                     1993
            ----           ----                  ----                  ----                     ----
            <S>            <C>                   <C>                   <C>                      <C>
            12.9x          11.6x                 10.2x                 6.2x(1)                  7.6x
</TABLE>
- --------
(1) Included in earnings for 1994 was a pretax provision of $68.2 million for
    formation and consolidation expenses as disclosed in Note 3 to the
    Company's 1994 consolidated financial statements. If this provision had
    not been made, the ratio of earnings to fixed charges would have been
    8.8x.
 
  For purposes of calculating this ratio, earnings consist of income from
continuing operations before income taxes and extraordinary items, plus
minority interests, less undistributed earnings (and plus losses) of
affiliates, plus interest expense and amortization of debt discount, fees and
expenses, plus one-third of rentals. Fixed charges consist of interest expense
and amortization of debt discount, fees and expenses, interest capitalized as
part of fixed assets and interest included in rental expense.
 
                           DESCRIPTION OF SECURITIES
 
  The Securities are to be issued under an Indenture (the "Indenture") between
the Company and The Chase Manhattan Bank, as Trustee (the "Trustee"), a copy
of which is filed as an exhibit to the Registration Statement. The following
summaries of certain provisions of the Indenture do not purport to be complete
and are subject to, and are qualified in their entirety by reference to, all
the provisions of the Indenture, including the definitions therein of certain
terms. Wherever particular Sections or defined terms of the Indenture are
referred to, such Sections or defined terms are incorporated herein by
reference.
 
                                       3
<PAGE>
 
  The following sets forth certain general terms and provisions of the
Securities offered hereby. The particular terms of the Securities offered by
any Prospectus Supplement (the "Offered Securities") will be described in the
Prospectus Supplement relating to such Offered Securities (the "Applicable
Prospectus Supplement").
 
GENERAL
 
  The Indenture does not limit the amount of Securities that may be issued
thereunder, and Securities may be issued thereunder from time to time in one
or more series. The Securities will be unsecured and unsubordinated
obligations of the Company and will rank equally and ratably with other
unsecured and unsubordinated obligations of the Company.
 
  Unless otherwise indicated in the Applicable Prospectus Supplement,
principal of, premium, if any, and interest on the Securities will be payable,
and the transfer of Securities will be registrable, at the office or agency to
be maintained by the Company in New York, New York, and at any other office or
agency maintained by the Company for such purpose. The Securities will be
issued only in fully registered form without coupons and, unless otherwise
indicated in the Applicable Prospectus Supplement, in denominations of $1,000
and integral multiples thereof. No service charge will be made for any
registration of transfer or exchange of the Securities, but the Company may
require payment of a sum sufficient to cover any tax or other governmental
charge imposed in connection therewith.
 
  The Applicable Prospectus Supplement will describe the following terms of
the Offered Securities: (1) the title of the Offered Securities; (2) any limit
on the aggregate principal amount of the Offered Securities; (3) the Person to
whom any interest on the Offered Securities shall be payable, if other than
the person in whose name that Security (or one or more Predecessor Securities)
is registered at the close of business on the Regular Record Date for such
interest; (4) the date or dates on which the principal of the Offered
Securities is payable; (5) the rate or rates (which may be fixed or variable)
at which the Offered Securities will bear interest, if any, or the method by
which such rate or rates will be determined, the date or dates from which any
such interest will accrue, the Interest Payment Dates on which any such
interest will be payable and the Regular Record Date for the interest payable
on any Interest Payment Date; (6) the place or places where the principal of
and any premium and interest on the Offered Securities will be payable; (7)
the period or periods within which, the price or prices at which and the terms
and conditions upon which the Offered Securities may be redeemed, in whole or
in part, at the option of the Company; (8) the obligation, if any, of the
Company to redeem, purchase or repay the Offered Securities pursuant to any
sinking fund or analogous provisions or at the option of a Holder thereof and
the period or periods within which, the price or prices at which and the terms
and conditions upon which the Offered Securities will be redeemed, purchased
or repaid, in whole or in part, pursuant to such obligation; (9) if other than
denominations of $1,000 and any integral multiple thereof, the denominations
in which the Offered Securities will be issuable; (10) the currency,
currencies or currency units in which payment of the principal of and any
premium and interest on any Offered Securities will be payable if other than
the currency of the United States of America; (11) if the amount of payments
of principal of or any premium or interest on any Offered Securities may be
determined with reference to an index or formula, the manner in which such
amounts will be determined; (12) if the principal of or any premium or
interest on any Offered Securities is to be payable, at the election of the
Company or a Holder thereof, in one or more currencies or currency units other
than that or those in which the Offered Securities are stated to be payable,
the currency, currencies or currency units in which payment of the principal
of and any premium and interest on the Offered Securities as to which such
election is made will be payable, and the periods within which and the terms
and conditions upon which such election is to be made; (13) the applicability,
if any, of the provisions described under "Defeasance and Covenant
Defeasance;" (14) whether the Offered Securities will be issuable, in whole or
in part, in the form of one or more Book-Entry Securities as described under
"Book-Entry Securities," and, in such case, the depository appointed by the
Company or its nominee with respect to the Offered Securities and the
circumstances under which the Book-Entry Security may be registered for
transfer or exchange or authenticated and delivered in the name of a Person
other than the Depository or its nominee; (15) if other than the principal
amount thereof, the portion of the principal amount of the Offered Securities
which will be payable upon declaration of acceleration of the Maturity
thereof; and (16) any other terms of the Offered Securities.
 
                                       4
<PAGE>
 
  The Securities may be issued as Original Issue Discount Securities to be
offered and sold at a substantial discount below their stated principal
amount. Federal income tax consequences and other special considerations
applicable to Original Issue Discount Securities and any Securities treated as
having been issued with original issue discount for federal income tax
purposes will be described in the Applicable Prospectus Supplement. "Original
Issue Discount Securities" means any Security which provides for an amount
less than the principal amount thereof to be due and payable upon the
declaration of acceleration of the Maturity thereof upon the occurrence of an
Event of Default and the continuation thereof.
 
  The Indenture does not contain covenants or other provisions designed to
afford holders of the Securities protection in the event of a highly leveraged
transaction, change in credit rating or other similar occurrence.
 
BOOK-ENTRY SECURITIES
 
  Unless otherwise provided in the Prospectus Supplement, the Securities will
be represented by one or more certificates (the "Global Securities"). The
Global Security representing Securities will be deposited with, or on behalf
of, The Depository Trust Company ("DTC"), or other successor depository
appointed by the Company (DTC or such other depository being the "Depository")
and registered in the name of the Depository or its nominee. Unless otherwise
provided in the Prospectus Supplement, Securities will not be issued in
definitive form. If the aggregate principal amount of any issue exceeds $200
million, one certificate will be issued with respect to each $200 million of
principal amount and an additional certificate will be issued with respect to
any remaining principal amount of such issue.
 
  DTC is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law,
a member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York Uniform Commercial Code, and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Securities
Exchange Act of 1934. DTC holds securities that its participants
("Participants") deposit with DTC. DTC also facilitates the settlement among
Participants of securities transactions, such as transfers and pledges, in
deposited securities through electronic computerized book-entry changes in
Participants' accounts, thereby eliminating the need for physical movement of
securities certificates. Participants who deposit securities with DTC directly
("Direct Participants") include securities brokers and dealers, banks, trust
companies, clearing corporations and certain other organizations. DTC is owned
by a number of its Direct Participants and by the New York Stock Exchange,
Inc., the American Stock Exchange, Inc. and the National Association of
Securities Dealers, Inc. Access to the DTC system is also available to others
such as securities brokers and dealers, banks and trust companies that clear
through or maintain a custodial relationship with a Direct Participant, either
directly or indirectly ("Indirect Participants"). The rules applicable to DTC
and its Participants are on file with the Commission.
 
  Upon the issuance by the Company of Securities represented by a Global
Security, purchases of Securities under the DTC system must be made by or
through Direct Participants, which will receive a credit for the Securities on
DTC's records. The ownership interest of each actual purchaser of each
Security ("Beneficial Owner") is in turn to be recorded on the Direct and
Indirect Participants' records. Beneficial Owners will not receive written
confirmation from DTC of their purchase, but Beneficial Owners are expected to
receive written confirmations providing details of the transaction, as well as
periodic statements of their holdings, from the Direct or Indirect Participant
through which the Beneficial Owner entered into the transaction. Transfers of
ownership interests in the Securities are to be accomplished by entries made
on the books of Participants acting on behalf of Beneficial Owners. Beneficial
Owners will not receive certificates representing their ownership interests in
Securities, except in the event that use of the book-entry system for the
Securities is discontinued. The laws of some states require that certain
purchasers of securities take physical delivery of such securities in
definitive form. Such limits and such laws may impair the ability to transfer
beneficial interests in the Global Security.
 
  So long as the Depository for the Global Security, or its nominee, is the
registered owner of the Global Security, the Depository or its nominee, as the
case may be, will be considered the sole owner or holder of the
 
                                       5
<PAGE>
 
Securities represented by such Global Security for all purposes under the
Indenture. Except as provided below, owners of beneficial interests in
Securities represented by the Global Security will not be entitled to have
Securities represented by such Global Security registered in their names, will
not receive or be entitled to receive physical delivery of Securities in
definitive form and will not be considered the owners or holders thereof under
the Indenture.
 
  To facilitate subsequent transfers, all Securities deposited by Participants
with DTC are registered in the name of DTC's partnership nominee, Cede & Co.
The deposit of Securities with DTC and their registration in the name of Cede
& Co. effect no change in beneficial ownership. DTC has no knowledge of the
actual Beneficial Owners of the Securities; DTC's records reflect only the
identity of the Direct Participants to whose accounts such Securities are
credited, which may or may not be the Beneficial Owners. The Participants will
remain responsible for keeping account of their holdings on behalf of their
customers. Conveyance of notices and other communications by DTC to Direct
Participants, by Direct Participants to Indirect Participants, and by Direct
Participants and Indirect Participants to Beneficial Owners will be governed
by arrangements among them, subject to any statutory or regulatory
requirements as may be in effect from time to time.
 
  Neither DTC nor Cede & Co. will consent or vote with respect to Securities.
Under its usual procedures, DTC mails an Omnibus Proxy to the Company as soon
as possible after the record date. The Omnibus Proxy assigns Cede & Co.'s
consenting or voting rights to those Direct Participants to whose accounts the
Securities are credited on the record date (identified in a listing attached
to the Omnibus Proxy).
 
  Payments of principal of and premium, if any, and interest on the Securities
represented by the Global Security registered in the name of DTC or its
nominee will be made by the Company through the Trustee under the Indenture or
a paying agent (the "Paying Agent"), which may also be the Trustee under the
Indenture, to DTC or its nominee, as the case may be, as the registered owner
of the Global Security. Neither the Company, the Trustee, nor the Paying Agent
will have any responsibility or liability for any aspect of the records
relating to or payments made on account of beneficial ownership interests of
the Global Security or for maintaining, supervising or reviewing any records
relating to such beneficial ownership interests.
 
  The Company has been advised that DTC, upon receipt of any payment of
principal, premium, if any, and interest in respect of a Global Security, will
credit Direct Participants' accounts on the payable date in accordance with
their respective holdings shown on DTC's records unless DTC has reason to
believe that it will not receive payment on the payable date. Payments by
Participants to Beneficial Owners will be governed by standing instructions
and customary practices, as is the case with securities held for the accounts
of customers in bearer form or registered in "street name," and will be the
responsibility of such Participant and not of DTC, the Paying Agent or the
Company, subject to any statutory or regulatory requirements as may be in
effect from time to time. Payment of principal, premium, if any, and interest
to DTC is the responsibility of the Company or the Paying Agent, disbursement
of such payments to Direct Participants shall be the responsibility of DTC,
and disbursement of such payments to the Beneficial Owners shall be the
responsibility of Direct and Indirect Participants.
 
  If the Depository with respect to a Global Security is at any time unwilling
or unable to continue as Depository and a successor Depository is not
appointed by the Company within 90 days, the Company will issue certificated
notes in exchange for the Securities represented by such Global Security.
 
  The information in this section concerning the Depository and the
Depository's book-entry system has been obtained from sources that the Company
believes to be reliable, but the Company takes no responsibility for the
accuracy thereof.
 
CERTAIN COVENANTS OF THE COMPANY
 
  Restrictions on Secured Funded Debt. The Indenture provides that the Company
will not, nor will it permit any Restricted Subsidiary to, incur, issue,
assume, guarantee or create any Secured Funded Debt, without
 
                                       6
<PAGE>
 
effectively providing concurrently with the incurrence, issuance, assumption,
guaranty or creation of any such Secured Funded Debt that the Outstanding
Securities (together with, if the Company shall so determine, any other
Indebtedness of the Company or such Restricted Subsidiary then existing or
thereafter created which is not subordinated to the Outstanding Securities)
will be secured equally and ratably with (or prior to) such Secured Funded
Debt, so long as such Secured Funded Debt will be secured by a Lien, unless,
after giving effect thereto, the sum of the aggregate amount of all
outstanding Secured Funded Debt of the Company and its Restricted Subsidiaries
together with all Attributable Debt in respect of sale and leaseback
transactions relating to a Principal Property (with the exception of
Attributable Debt which is excluded pursuant to clauses (1) to (6) described
under "Limitations on Sales and Leasebacks" below), would not exceed 15% of
Consolidated Net Tangible Assets; provided, however, that this restriction
will not apply to, and there will be excluded from Secured Funded Debt in any
computation under this restriction, Funded Debt secured by: (1) Liens on
property, shares of capital stock or indebtedness of any corporation existing
at the time such corporation becomes a Subsidiary; (2) Liens on property,
shares of capital stock or indebtedness existing at the time of acquisition
thereof or incurred within 180 days of the time of acquisition thereof
(including, without limitation, acquisition through merger or consolidation)
by the Company or any Restricted Subsidiary; (3) Liens on property, shares of
capital stock or indebtedness acquired (or constructed) by the Company or any
Restricted Subsidiary and created prior to, at the time of, or within 270 days
after such acquisition (including, without limitation, acquisition through
merger or consolidation) (or the completion of such construction or
commencement of commercial operation of such property, whichever is later) to
secure or provide for the payment of all or any part of the purchase price (or
the construction price) thereof; (4) Liens in favor of the Company or any
Restricted Subsidiary; (5) Liens in favor of the United States of America, any
State thereof or the District of Columbia, or any agency, department or other
instrumentality thereof, to secure partial, progress, advance or other
payments pursuant to any contract or provisions of any statute; (6) Liens
incurred or assumed in connection with the issuance of revenue bonds the
interest on which is exempt from federal income taxation pursuant to Section
103(b) of the Internal Revenue Code; (7) Liens securing the performance of any
contract or undertaking not directly or indirectly in connection with the
borrowing of money, the obtaining of advances or credit or the securing of
Funded Debt, if made and continuing in the ordinary course of business; (8)
Liens incurred (no matter when created) in connection with the Company's or a
Restricted Subsidiary's engaging in leveraged or single-investor lease
transactions; provided, however, that the instrument creating or evidencing
any borrowings secured by such Lien will provide that such borrowings are
payable solely out of the income and proceeds of the property subject to such
Lien and are not a general obligation of the Company or such Restricted
Subsidiary; (9) Liens under workers' compensation laws, unemployment insurance
laws or similar legislation, or good faith deposits in connection with bids,
tenders, contracts or deposits to secure public or statutory obligations of
the Company or any Restricted Subsidiary, or deposits of cash or obligations
of the United States of America to secure surety and appeal bonds to which the
Company or any Restricted Subsidiary is a party or in lieu of such bonds, or
pledges or deposits for similar purposes in the ordinary course of business,
or Liens imposed by law, such as laborers' or other employees', carriers',
warehousemen's, mechanics', materialmen's and vendors' Liens, and Liens
arising out of judgments or awards against the Company or any Restricted
Subsidiary with respect to which the Company or such Restricted Subsidiary at
the time shall be prosecuting an appeal or proceedings for review and with
respect to which it shall have secured a stay of execution pending such appeal
or proceedings for review, or Liens for taxes not yet subject to penalties for
nonpayment or the amount or validity of which is being in good faith contested
by appropriate proceedings by the Company or any Restricted Subsidiary, as the
case may be, or minor survey exceptions, minor encumbrances, easements or
reservations of, or rights of others for, rights of way, sewers, electric
lines, telegraph and telephone lines and other similar purposes, or zoning or
other restrictions or Liens as to the use of real properties, which Liens,
exceptions, encumbrances, easements, reservations, rights and restrictions do
not, in the opinion of the Company, in the aggregate materially detract from
the value of said properties or materially impair their use in the operation
of the business of the Company and its Restricted Subsidiaries; (10) Liens
incurred to finance all or any portion of the cost of construction, alteration
or repair of any Principal Property and improvements thereto created prior to
or within 270 days after completion of such construction, alteration or
repair; (11) Liens outstanding on the date of the Indenture; or (12) any
extension, renewal, refunding or replacement of the foregoing.
 
                                       7
<PAGE>
 
  "Attributable Debt" means, as to any particular lease under which either the
Company or any Restricted Subsidiary is at the time liable as lessee for a
term of more than 12 months and at any date as of which the amount thereof is
to be determined, the total net obligations of the lessee for rental payments
during the remaining term of the lease (including any period for which such
lease has been extended or may, at the option of the lessor, be extended)
discounted from the respective due dates thereof to such determination date at
a rate per annum equivalent to the greater of (a) the weighted-average Yield
to Maturity (as defined in the Indenture) of the Outstanding Securities, such
average being weighted by the principal amount of the Outstanding Securities
of each series or, in the case of Original Issue Discount Securities (as
defined in the Indenture), such amount to be the principal amount of such
outstanding Original Issue Discount Securities that would be due and payable
as of the date of such determination upon a declaration of acceleration of the
maturity thereof pursuant to the Indenture and (b) the interest rate inherent
in such lease (as determined in good faith by the Company), both to be
compounded semi-annually.
 
  "Consolidated Net Tangible Assets" means, at any date, the total assets
appearing on the most recent consolidated balance sheet of the Company and its
Subsidiaries as at the end of the fiscal quarter of the Company ending not
more than 135 days prior to such date, prepared in accordance with generally
accepted accounting principles, less (a) investments in and advances to
affiliates as shown on the consolidated balance sheet of the Company and its
Subsidiaries, and (b) Intangible Assets.
 
  "Funded Debt" means (i) any indebtedness of the Company or a Restricted
Subsidiary maturing more than 12 months after the time of computation thereof,
(ii) guarantees of Funded Debt or of dividends of others (except guarantees in
connection with the sale or discount of accounts receivable, trade acceptances
and other paper arising in the ordinary course of business), (iii) in the case
of any Restricted Subsidiary, all preferred stock having mandatory redemption
provisions of such Restricted Subsidiary as reflected on such Restricted
Subsidiary's balance sheet prepared in accordance with generally accepted
accounting principles, and (iv) all Capital Lease Obligations (as defined in
the Indenture).
 
  "Indebtedness" means, at any date, without duplication, (i) all obligations
for borrowed money of the Company or a Restricted Subsidiary or any other
indebtedness of the Company or a Restricted Subsidiary, evidenced by bonds,
debentures, notes or other similar instruments, and (ii) Funded Debt.
 
  "Intangible Assets" means, at any date, the value (net of any applicable
reserves), as shown on or reflected in the most recent consolidated balance
sheet of the Company and its Subsidiaries as at the end of the fiscal quarter
of the Company ending not more than 135 days prior to such date, prepared in
accordance with generally accepted accounting principles, of: (i) all trade
names, trademarks, licenses, patents, copyrights, service marks, goodwill and
other like intangibles, but excluding, for purposes of this definition, the
ascribed value relating to the assembled sales force and existing customer
lists for any acquisition by the Company or any of its Subsidiaries after the
date of the Indenture, and (ii) unamortized debt discount and expense, less
unamortized premium.
 
  "Liens" means such pledges, mortgages, security interests and other liens
which secure Secured Funded Debt.
 
  "Principal Property" means any building, structure or other facility,
together with the land upon which it is erected and fixtures comprising a part
thereof, used primarily for manufacturing and located in the United States,
the gross book value (without deduction of any reserve for depreciation) of
which on the date as of which the determination is being made is an amount
which exceeds 2% of the Consolidated Net Tangible Assets, other than any such
building, structure or other facility or any portion thereof or any such
fixture (together with the land upon which it is erected and fixtures
comprising a part thereof) which, in the opinion of the Board of Directors of
the Company (as evidenced by a resolution of the Board of Directors to such
effect which is provided to the Trustee), is not of material importance to the
total business conducted by the Company and its Subsidiaries taken as a whole.
 
                                       8
<PAGE>
 
  "Restricted Subsidiary" means, at any date, each Subsidiary organized in the
United States with total assets, as reflected in the most recent balance sheet
of the Subsidiary as at the end of the fiscal quarter of such Subsidiary
ending not more than 135 days prior to such date, prepared in accordance with
generally accepted accounting principles, greater than 2% of Consolidated Net
Tangible Assets. Restricted Subsidiaries shall not include: (a) Nalco/Exxon
Energy Chemicals, Inc., (b) Nalco/Exxon Energy Chemicals, L.P., (c) Nalco TWO,
Inc. (d) Treated Water Outsourcing, a Nalco/U.S. Filter Joint Venture, (e)
Nalco Leasing Corporation, and (f) any Subsidiary of any of the foregoing.
 
  "Secured Funded Debt" means Funded Debt which is secured by any pledge of,
or mortgage, security interest or other lien on any (i) Principal Property
(whether owned on the date of the Indenture or thereafter acquired or
created), (ii) shares of stock owned by the Company or a Subsidiary in a
Restricted Subsidiary or (iii) indebtedness of a Restricted Subsidiary.
 
  "Subsidiary" means any corporation of which at least a majority of the
outstanding stock, which under ordinary circumstances (not dependent upon the
happening of a contingency) has voting power to elect a majority of the board
of directors (or similar management body) of such corporation, is owned
directly or indirectly by the Company or by one or more Subsidiaries of the
Company, or by the Company and one or more Subsidiaries.
 
  Limitation on Sales and Leasebacks. The Indenture provides that the Company
will not, nor will it permit any Restricted Subsidiary to, enter into any
arrangement with any Person providing for the leasing by the Company or any
Restricted Subsidiary of any Principal Property of the Company or any
Restricted Subsidiary, which Principal Property has been or is to be sold or
transferred by the Company or such Restricted Subsidiary to such Person (a
"sale and leaseback transaction") unless, after giving effect thereto, the
aggregate amount of all Attributable Debt with respect to all such sale and
leaseback transactions plus all Secured Funded Debt (with the exception of
Funded Debt secured by liens which is excluded pursuant to clauses (1) to (12)
described under "Restrictions on Secured Funded Debt" above) would not exceed
15% of Consolidated Net Tangible Assets. This covenant will not apply to, and
there will be excluded from Attributable Debt in any computation under this
restriction or under "Restrictions on Secured Funded Debt" above, Attributable
Debt with respect to any sale and leaseback transaction if: (1) the Company or
a Restricted Subsidiary is permitted to create Funded Debt secured by a Lien
pursuant to clauses (1) to (12) inclusive described under "Restrictions on
Secured Funded Debt" above on the Principal Property to be leased, in an
amount equal to the Attributable Debt with respect to such sale and leaseback
transaction, without equally and ratably securing the Outstanding Securities;
(2) the Company or a Restricted Subsidiary, within 270 days after the sale or
transfer shall have been made by the Company or a Restricted Subsidiary, shall
apply an amount in cash equal to the greater of (i) the net proceeds of the
sale or transfer of the Principal Property leased pursuant to such arrangement
or (ii) the fair market value of the Principal Property so leased at the time
of entering into such arrangement (as determined by the Chief Executive
Officer, the President, the Chief Financial Officer, the Treasurer or the
Controller of the Company) to the retirement of Secured Funded Debt of the
Company or any Restricted Subsidiary (other than Secured Funded Debt owned by
the Company or any Restricted Subsidiary); (3) the Company or a Restricted
Subsidiary invests the net proceeds, or an amount equal to the anticipated net
proceeds, of the sale or transfer of the Principal Property leased pursuant to
such transaction, within 270 days prior to or subsequent to such sale or
transfer, in other property having a fair market value (as determined by the
Chief Executive Officer, the President, the Chief Financial Officer, the
Treasurer or the Controller of the Company) at least equal to the fair market
value of the Principal Property so leased; (4) the effective date of any such
arrangement is within 270 days of the acquisition of the Principal Property
(including, without limitation, acquisition by merger or consolidation) or the
completion of construction and commencement of operation thereof, whichever is
later; (5) the lease in such sale and leaseback transaction is for a term,
including renewals, of not more than five years; or (6) the sale and leaseback
transaction is entered into between the Company and a Restricted Subsidiary or
between Restricted Subsidiaries.
 
EVENTS OF DEFAULT
 
  Any one of the following events will constitute an Event of Default under
the Indenture with respect to Securities of any series: (a) failure to pay any
interest on any Security of that series when due, continued for 30
 
                                       9
<PAGE>
 
days; (b) failure to pay principal of or any premium on any Security of that
series when due; (c) failure to deposit any sinking fund or other payment,
when due, in respect of any Security of that series; (d) failure to perform,
or breach of, any other covenant or warranty of the Company in the Indenture
(other than a covenant included in the Indenture solely for the benefit of a
series of Securities thereunder other than that series) continued for 90 days
after written notice as provided in the Indenture; (e) certain events in
bankruptcy, insolvency or reorganization of the Company; or (f) any other
Event of Default provided with respect to Securities of that series.
 
  If any Event of Default with respect to the Securities of any series at the
time Outstanding occurs and is continuing, either the Trustee or the Holder or
Holders of at least 25% in aggregate principal amount of the Outstanding
Securities of that series may declare the principal amount (or, if the
Securities of that series are Original Issue Discount Securities, such portion
of the principal amount as may be specified in the terms thereof) of all the
Securities of that series to be due and payable immediately. At any time after
a declaration of acceleration with respect to Securities of any series has
been made, but before a judgment or decree based on acceleration has been
obtained, the Holders of a majority in aggregate principal amount of
Outstanding Securities of that series may, under certain circumstances,
rescind and annul such acceleration.
 
  Reference is made to the Applicable Prospectus Supplement relating to any
series of Offered Securities that are Original Issue Discount Securities for
the particular provisions relating to acceleration of the Stated Maturity of a
portion of the principal amount of such series of Original Issue Discount
Securities upon the occurrence of an Event of Default and the continuation
thereof.
 
  The Indenture provides that, subject to the duty of the Trustee during
default to act with the required standard of care, the Trustee will be under
no obligation to exercise any of its rights or powers under the Indenture at
the request or direction of any of the Holders, unless such Holders shall have
offered to the Trustee reasonable indemnity. Subject to such provisions for
the indemnification of the Trustee and to certain other conditions, the
Holders of a majority in aggregate principal amount of the Outstanding
Securities of any series will have the right to direct the time, method and
place of conducting any proceeding for any remedy available to the Trustee, or
exercising any trust or power conferred on the Trustee, with respect to the
Securities of that series.
 
  No Holder of any series of Securities will have any right to institute any
proceeding with respect to the Indenture or for any remedy thereunder, unless
such Holder shall have previously given to the Trustee written notice of a
continuing Event of Default and unless the Holders of at least 25% in
principal amount of the Outstanding Securities of that series shall have made
written request, and offered reasonable indemnity, to the Trustee to institute
such proceeding as trustee, and the Trustee shall not have received from the
Holders of a majority in aggregate principal amount of the Outstanding
Securities of that series a direction inconsistent with such request and shall
have failed to institute such proceeding within 60 days. However, such
limitations do not apply to a suit instituted by a Holder of a Security for
enforcement of payment of the principal of and premium, if any, or interest on
such Security on or after the respective due dates expressed in such Security.
 
  The Company is required to furnish to the Trustee annually a statement as to
the performance by the Company of certain of its obligations under the
Indenture and as to any default in such performance.
 
MODIFICATION AND WAIVER
 
  Modifications and amendments of the Indenture may be made by the Company and
the Trustee with the consent of the Holder or Holders of not less than the
majority in aggregate principal amount of the Outstanding Securities of each
series issued under the Indenture and affected by the modification or
amendment; provided, however, that no such modification or amendment may,
without the consent of the Holder or Holders of all Securities affected
thereby, (i) change the Stated Maturity of the principal of, or any
installment of principal of or interest on, any Security; (ii) reduce the
principal amount of, or the premium, if any, or (except as otherwise provided
in the Applicable Prospectus Supplement) interest on, any Security (including
in the case of an Original
 
                                      10
<PAGE>
 
Issue Discount Security the amount payable upon acceleration of the maturity
thereof); (iii) change the place or currency of payment of principal of, or
premium, if any, or interest on any Security; (iv) impair the right to
institute suit for the enforcement of any payment on any Security on or at the
Stated Maturity thereof (or in the case of redemption, on or after the
Redemption Date); or (v) reduce the percentage in principal amount of
Outstanding Securities of any series, the consent of whose Holders is required
for modification or amendment of the Indenture or for waiver of compliance
with certain provisions of the Indenture or for waiver of certain defaults.
 
  The Holder or Holders of at least a majority in aggregate principal amount
of the Outstanding Securities of any series may, on behalf of all Holders of
that series, waive compliance by the Company with certain restrictive
provisions of the Indenture. The Holder or Holders of not less than a majority
in aggregate principal amount of the Outstanding Securities of any series may,
on behalf of all Holders of that series, waive any past default under the
Indenture, except a default in the payment of principal, premium or interest
and in respect of a covenant or provision of the Indenture that cannot be
modified or amended without the consent of the Holder of each Outstanding
Security of such series affected thereby.
 
CONSOLIDATION, MERGER AND SALE OF ASSETS
 
  The Company may not consolidate with or merge into any other corporation (as
defined) or transfer or lease its assets substantially as an entirety to any
corporation and may not permit any corporation to merge into or consolidate
with the Company or transfer or lease its assets substantially as an entirety
to the Company, unless (i) any successor or purchaser is a corporation
organized under the laws of the United States of America, any State or the
District of Columbia, and any such successor or purchaser expressly assumes
the Company's obligations on the Securities under a supplemental Indenture,
(ii) immediately after giving effect to the transaction no Event of Default,
and no event which, after notice or lapse of time or both, would become an
Event of Default, shall have occurred and be continuing, (iii) if properties
or assets of the Company become subject to a mortgage not permitted by the
Indenture, the Company or such successor corporation, as the case may be,
takes such steps as shall be necessary effectively to secure the Securities
equally and ratably with (or prior to) all indebtedness secured thereby, and
(iv) the Company has delivered to the Trustee an Officers' Certificate and an
Opinion of Counsel stating compliance with these provisions.
 
DEFEASANCE AND COVENANT DEFEASANCE
 
  The Indenture provides that, if such provision is made applicable to the
Securities of any series pursuant to Section 3.1 of the Indenture, the
Company, at the Company's option, (a) will be discharged from any and all
obligations in respect of the Outstanding Securities of any series (except for
certain obligations to register the transfer of or exchange of Securities of
such series, replace stolen, lost or mutilated Securities of such series,
maintain paying agencies and hold moneys for payment in trust) or (b) need not
comply with certain restrictive covenants of the Indenture, including those
described under "Certain Covenants of the Company," and the occurrence of an
event described in clause (d) under "Events of Default" shall no longer be an
Event of Default, in each case, if the Company deposits, in trust, with the
Trustee money or U.S. Government Obligations, which, through the payment of
interest thereon and principal thereof in accordance with their terms, will
provide money in an amount sufficient to pay all the principal of, premium, if
any, and interest on the Securities of such series on the dates such payments
are due (which may include one or more redemption dates designated by the
Company) in accordance with the terms of the Securities of such series. Such a
trust may be established only if, among other things, (i) such deposit will
not cause the Trustee to have any conflicting interest with respect to other
securities of the Company, (ii) such defeasance will not result in a breach or
violation of, or constitute a default under, the Indenture or any other
agreement or instrument to which the Company is a party or by which it is
bound and (iii) the Company shall have delivered an Opinion of Counsel to the
effect that the Holders will not recognize income, gain or loss for federal
income tax purposes as a result of such deposit or defeasance and will be
subject to federal income tax in the same manner as if such defeasance had not
occurred, which Opinion of Counsel, in the case of clause (a) above, must
refer to and be based upon a published ruling of the Internal Revenue Service,
a private ruling of the Internal Revenue Service addressed to the Company, or
otherwise a
 
                                      11
<PAGE>
 
change in applicable federal income tax law occurring after the date of the
Indenture. In the event the Company omits to comply with its remaining
obligations under the Indenture after a defeasance of the Indenture with
respect to the Securities of any series as described under clause (b) above
and the Securities of such series are declared due and payable because of the
occurrence of any Event of Default, the amount of money and U.S. Government
Obligations on deposit with the Trustee may be insufficient to pay amounts due
on the Securities of such series at the time of the acceleration resulting
from such Event of Default. However, the Company will remain liable in respect
of such payments.
 
CONCERNING THE TRUSTEE
 
  The Chase Manhattan Bank will be the Trustee under the Indenture. The
Trustee and its affiliates perform services for the Company in the ordinary
course of business and the Trustee is a lender bank under the Company's credit
facilities.
 
                             PLAN OF DISTRIBUTION
 
  The Company may sell the Securities being offered hereby through agents,
through underwriters and through dealers, and Securities may be sold to other
purchasers directly or through agents or through a combination of any such
methods of sale.
 
  The distribution of the Securities may be effected from time to time in one
or more transactions at a fixed price or prices, which may be changed, or at
market prices prevailing at the time of sale, at prices related to such
prevailing market prices, or at negotiated prices.
 
  Offers to purchase Securities may be solicited by agents designated by the
Company from time to time. Any such agent who may be deemed to be an
underwriter (as defined in the Securities Act) involved in the offer or sale
of the Securities (as defined in this Prospectus) will be named in the
Applicable Prospectus Supplement. The Applicable Prospectus Supplement will
also set forth any commissions payable by the Company to such agent. Agents
may be entitled under agreements that may be entered into with the Company to
indemnification by the Company against certain liabilities, including
liabilities under the Securities Act, and such agents or their affiliates may
be customers of, extend credit to or engage in transactions with or perform
services for the Company in the ordinary course of business. Unless otherwise
indicated in the Applicable Prospectus Supplement, any such agent will be
acting on a reasonable efforts basis for the period of its appointment.
 
  If any underwriters are utilized in the sale of the Securities, the Company
will enter into an underwriting agreement with such underwriters at the time
of sale to them, and the names of the underwriters and the terms of the
transaction will be set forth in the Applicable Prospectus Supplement that
will be used by the underwriters to make sales of the Securities in respect of
which this Prospectus is delivered to the public. The underwriters may be
entitled under the relevant underwriting agreement to indemnification by the
Company against certain liabilities, including liabilities under the
Securities Act, and such underwriters or their affiliates may be customers of,
extend credit to or engage in transactions with or perform services for the
Company in the ordinary course of business.
 
  If dealers are utilized in the sale of the Securities in respect of which
this Prospectus is delivered, the Company will sell such Securities to such
dealers as principal. The dealers may then resell such Securities to the
public at fixed prices or varying prices to be determined by such dealers at
the time of resale. Dealers may be entitled to indemnification by the Company
against certain liabilities, including liabilities under the Securities Act,
and such dealers or their affiliates may be customers of, extend credit to or
engage in transactions with or perform services for the Company in the
ordinary course of business.
 
  Unless otherwise indicated in the Applicable Prospectus Supplement,
Securities are not proposed to be listed on a securities exchange, and any
underwriters or dealers will not be obligated to make a market in Securities.
The Company cannot predict the activity or liquidity of any trading in the
Securities.
 
                                      12
<PAGE>
 
                                 LEGAL MATTERS
 
  Unless otherwise indicated in a supplement to this Prospectus, certain legal
matters in connection with the Securities offered hereby will be passed upon
for the Company by Mayer, Brown & Platt, Chicago, Illinois. The legality of
the Securities offered hereby will be passed upon for the underwriters,
dealers and agents, if any, as set forth in the Prospectus Supplement.
 
                                    EXPERTS
 
  The financial statements incorporated in this Prospectus by reference to the
Annual Report on Form 10-K for the year ended December 31, 1997 have been so
incorporated in reliance on the report of Price Waterhouse LLP, independent
accountants, given on the authority of said firm as experts in auditing and
accounting.
 
                                      13
<PAGE>
 
                                    PART II
 
                    INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
  The following table sets forth the estimated expenses in connection with the
issuance and distribution of the securities registered hereby, other than
underwriting discounts and commissions:
 
<TABLE>
      <S>                                                              <C>
      SEC registration fee............................................ $118,000
      Blue sky fees and expenses......................................    5,000
      Printing costs..................................................   50,000
      Legal fees and expenses.........................................  100,000
      Accounting fees and expenses....................................   60,000
      Trustee fees and expenses.......................................   10,000
      Rating agency fees..............................................  225,000
      Miscellaneous expenses..........................................   20,000
                                                                       --------
          Total....................................................... $588,000
                                                                       ========
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
  (a) Section 145 of the Delaware General Corporation Law permits, and in some
circumstances, requires, indemnification of officers, directors and employees
of the Company.
 
  (b) Article Six of the Certificate of Incorporation of the Company requires
the Company to indemnify directors and officers of the Company to the full
extent permitted by law.
 
  (c) The Company maintains insurance policies which insure the Company and
the officers and directors of the Company against certain liabilities,
including certain liabilities pursuant to the Securities Act of 1933.
 
ITEM 16. EXHIBITS.
 
  A list of exhibits filed herewith or incorporated by reference is contained
in the Exhibit Index, which is incorporated herein by reference.
 
ITEM 17. UNDERTAKINGS.
 
  The undersigned registrant hereby undertakes:
 
    (1) To file, during any period in which offers or sales are being made, a
  post-effective amendment to this Registration Statement:
 
      (i) To include any prospectus required by section 10(a)(3) of the
    Securities Act of 1933;
 
      (ii) To reflect in the prospectus any facts or events arising after
    the effective date of the Registration Statement (or the most recent
    post-effective amendment thereof) which, individually or in the
    aggregate, represent a fundamental change in the information set forth
    in the Registration Statement. Notwithstanding the foregoing, any
    increase or decrease in volume of securities offered (if the total
    dollar value of securities offered would not exceed that which was
    registered) and any deviation from the low or high end of the estimated
    maximum offering range may be reflected in the form of prospectus filed
    with the Commission pursuant to Rule 424(b) if, in the aggregate, the
    changes in volume and price represent no more than a 20% change in the
    maximum aggregate offering price set forth in the "Calculation of
    Registration Fee" table in the effective registration statement; and
 
      (iii) To include any material information with respect to the plan of
    distribution not previously disclosed in the Registration Statement or
    any material change to such information in the Registration Statement;
 
                                     II-1
<PAGE>
 
  provided, however, that paragraphs (1)(i) and (1)(ii) do not apply if the
  information required to be included in a post-effective amendment by those
  paragraphs is contained in periodic reports filed with or furnished to the
  Commission by the registrant pursuant to section 13 or section 15(d) of the
  Securities Exchange Act of 1934 that are incorporated by reference in the
  Registration Statement.
 
    (2) That for the purpose of determining any liability under the
  Securities Act of 1933, each such post-effective amendment shall be deemed
  to be a new Registration Statement relating to the securities offered
  therein, and the offering of such securities at that time shall be deemed
  to be the initial bona fide offering thereof.
 
    (3) To remove from registration by means of a post-effective amendment
  any of the securities being registered which remain unsold at the
  termination of the offering.
 
    (4) That for purposes of determining any liability under the Securities
  Act of 1933, each filing of the registrant's annual report pursuant to
  Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 that
  is incorporated by reference in this Registration Statement shall be deemed
  to be a new Registration Statement relating to the securities offered
  therein, and the offering of such securities at that time shall be deemed
  to be the initial bona fide offering thereof.
 
    (5) Insofar as indemnification for liabilities arising under the
  Securities Act of 1933 may be permitted to directors, officers and
  controlling persons of the registrant pursuant to the provisions described
  in Item 15, or otherwise, the registrant has been advised that in the
  opinion of the Securities and Exchange Commission such indemnification is
  against public policy as expressed in the Act and is, therefore,
  unenforceable. In the event that a claim for indemnification against such
  liabilities (other than the payment by the registrant of expenses incurred
  or paid by a director, officer or controlling person of the registrant in
  the successful defense of any action, suit or proceeding) is asserted by
  such director, officer or controlling person in connection with the
  securities being registered, the registrant will, unless in the opinion of
  its counsel the matter has been settled by controlling precedent, submit to
  a court of appropriate jurisdiction the question whether such
  indemnification by it is against public policy as expressed in the Act and
  will be governed by the final adjudication of such issue.
 
    (6) That for purposes of determining any liability under the Securities
  Act of 1933, the information omitted from the form of prospectus filed as
  part of this registration statement in reliance upon Rule 430A and
  contained in a form of prospectus filed by the registrant pursuant to Rule
  424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be
  part of this Registration Statement as of the time it was declared
  effective.
 
    (7) That for the purpose of determining any liability under the
  Securities Act of 1933, each post-effective amendment that contains a form
  of prospectus shall be deemed to be a new registration statement relating
  to the securities offered therein, and the offering of such securities at
  that time shall be deemed to be the initial bona fide offering thereof.
 
                                     II-2
<PAGE>
 
                                  SIGNATURES
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT
CERTIFIES THAT IT HAS REASONABLE GROUNDS TO BELIEVE THAT IT MEETS ALL OF THE
REQUIREMENTS FOR FILING ON FORM S-3 AND HAS DULY CAUSED THIS REGISTRATION
STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY
AUTHORIZED, IN THE CITY OF NAPERVILLE, STATE OF ILLINOIS, ON APRIL 20, 1998.
 
                                          Nalco Chemical Company
 
                                                 /s/ Edward J. Mooney
                                          By: _________________________________
                                            Edward J. Mooney
                                            Chairman and Chief Executive
                                            Officer
 
                               POWER OF ATTORNEY
 
  EACH PERSON WHOSE SIGNATURE APPEARS BELOW HEREBY CONSTITUTES AND APPOINTS
WILLIAM G. MARSHALL, SUZZANNE J. GIOIMO AND WILLIAM E. PARRY AND EACH OF THEM,
THE TRUE AND LAWFUL ATTORNEYS-IN-FACT AND AGENTS OF THE UNDERSIGNED, WITH FULL
POWER OF SUBSTITUTION AND RESUBSTITUTION, FOR AND IN THE NAME, PLACE AND STEAD
OF THE UNDERSIGNED, IN ANY AND ALL CAPACITIES, TO SIGN ANY AND ALL AMENDMENTS
(INCLUDING POST-EFFECTIVE AMENDMENTS) TO THIS REGISTRATION STATEMENT AS WELL
AS ANY RELATED REGISTRATION STATEMENT (OR AMENDMENT THERETO) FILED PURSUANT TO
RULE 462(B) PROMULGATED UNDER THE SECURITIES ACT OF 1933, AND TO FILE THE
SAME, WITH ALL EXHIBITS THERETO, AND OTHER DOCUMENTS IN CONNECTION THEREWITH,
WITH THE SECURITIES AND EXCHANGE COMMISSION, AND HEREBY GRANTS TO SUCH
ATTORNEYS-IN-FACT AND AGENTS, AND EACH OF THEM, FULL POWER AND AUTHORITY TO DO
AND PERFORM EACH AND EVERY ACT AND THING REQUISITE AND NECESSARY TO BE DONE,
AS FULLY TO ALL INTENTS AND PURPOSES AS THE UNDERSIGNED MIGHT OR COULD DO IN
PERSON, HEREBY RATIFYING AND CONFIRMING ALL THAT SAID ATTORNEYS-IN-FACT AND
AGENTS, OR ANY OF THEM, OR THEIR OR HIS SUBSTITUTE OR SUBSTITUTES, MAY
LAWFULLY DO OR CAUSE TO BE DONE BY VIRTUE HEREOF.
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BELOW BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATES INDICATED.
 
<TABLE>
<CAPTION>
             SIGNATURE                           TITLE                    DATE
             ---------                           -----                    ----
 
 
<S>                                  <C>                           <C>
   /s/ Jose Luis Ballesteros         Director                        April 20, 1998
____________________________________
       Jose Luis Ballesteros
 
     /s/ Harold G. Bernthal          Director                        April 20, 1998
____________________________________
         Harold G. Bernthal
 
    /s/ William E. Buchholz          Chief Financial Officer         April 20, 1998
____________________________________
        William E. Buchholz
 
       /s/ Harry Corless             Director                        April 20, 1998
____________________________________
           Harry Corless
 
       /s/ Howard M. Dean            Director                        April 20, 1998
____________________________________
           Howard M. Dean
 
                                     Director                        April   , 1998
____________________________________
        John P. Frazee, Jr.
 
</TABLE>
 
 
                                     II-3
<PAGE>
 
<TABLE>
<CAPTION>
             SIGNATURE                           TITLE                    DATE
             ---------                           -----                    ----
 
 
<S>                                  <C>                           <C>
      /s/ Arthur L. Kelly            Director                        April 20, 1998
____________________________________
          Arthur L. Kelly
 
      /s/ Burnett S. Kelly           Director                        April 20, 1998
____________________________________
          Burnett S. Kelly
 
   /s/ Frederick A. Krehbiel         Director                        April 20, 1998
____________________________________
       Frederick A. Krehbiel
 
      /s/ Edward J. Mooney           Director, Chairman and Chief    April 20, 1998
____________________________________  Executive Officer
          Edward J. Mooney
     /s/ Sheila A. Penrose           Director                        April 20, 1998
____________________________________
         Sheila A. Penrose
 
     /s/ Robert L. Ratliff           Controller (Chief Accounting    April 20, 1998
____________________________________  Officer)
         Robert L. Ratliff
        /s/ John J. Shea             Director                        April 20, 1998
____________________________________
            John J. Shea
</TABLE>
 
 
 
                                      II-4
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                             DESCRIPTION
  -------                            -----------
 <C>       <S>                                                               <C>
  1(a)     Form of Underwriting Agreement(1)..............................
  4        Form of Indenture between the Company and The Chase Manhattan
           Bank (including form of Security)..............................
  5        Opinion of Mayer, Brown & Platt as to the legality of the secu-
           rities being registered........................................
 12        Computation of Ratio of Earnings to Fixed Charges..............
 23(a)     Consent of Price Waterhouse LLP................................
 23(b)     Consent of Mayer, Brown & Platt (contained in Exhibit 5).......
 24        Power of attorney (contained on the signature page to the ini-
           tial registration statement)...................................
 25        Form T-1 Statement of Eligibility under the Trust Indenture Act
           of 1939 of The Chase Manhattan Bank............................
</TABLE>
- --------
(1) To be filed as an exhibit to a report on Form 8-K pursuant to Item 601 of
    Regulation S-K.

<PAGE>
 
                  ===========================================



                             NALCO CHEMICAL COMPANY

                                       TO

                            THE CHASE MANHATTAN BANK
                                              Trustee



                                   _________


                                   INDENTURE

                          Dated as of April ___, 1998


                                Debt Securities



                  ===========================================
<PAGE>

                             Nalco Chemical Company
                 Certain Sections of this Indenture relating to
                 Sections 3.10 through 3.18, inclusive, of the
                    Trust Indenture Act of 1939, as amended:

<TABLE>
<CAPTION>
      Provision of Trust
    Indenture Act of 1939,
          as amended                                           Indenture Section
<S>                                                            <C>
(S) 310(a)(1)              ..................................  6.9
       (a)(2)              ..................................  6.9
       (a)(3)              ..................................  Not Applicable
       (a)(4)              ..................................  Not Applicable
       (b)                 ..................................  6.8, 6.10
       (c)                 ..................................  Not Applicable
(S) 311(a)                 ..................................  6.13
       (b)                 ..................................  6.13
       (c)                 ..................................  Not Applicable
(S) 312(a)                 ..................................  7.1, 7.2(a)
       (b)                 ..................................  7.2(b)
       (c)                 ..................................  7.2(c)
(S) 313(a)                 ..................................  7.3(a)
       (b)                 ..................................  7.3(a)
       (c)                 ..................................  7.3(a)
       (d)                 ..................................  7.3(b)
(S) 314(a)                 ..................................  7.4
       (a)(4)              ..................................  1.1, 10.4
       (b)                 ..................................  Not Applicable
       (c)(1)              ..................................  1.2
       (c)(2)              ..................................  1.2
       (c)(3)              ..................................  Not Applicable
       (d)                 ..................................  Not Applicable
       (e)                 ..................................  1.2
       (f)                 ..................................  1.2
(S) 315(a)                 ..................................  6.1
       (b)                 ..................................  6.2
       (c)                 ..................................  6.1
       (d)                 ..................................  6.1
       (e)                 ..................................  5.14
(S) 316(a)                 ..................................  1.1
       (a)(1)(A)           ..................................  5.2, 5.12
       (a)(1)(B)           ..................................  5.13
       (a)(2)              ..................................  Not Applicable
       (b)                 ..................................  5.8
       (c)                 ..................................  1.4(c)
(S) 317(a)(1)              ..................................  5.3
       (a)(2)              ..................................  5.4
       (b)                 ..................................  10.3
(S) 318(a)                 ..................................  1.7
</TABLE>
___________________________

NOTE: This reconciliation and tie shall not, for any purpose, be deemed to be a
      part of the Indenture.
<PAGE>

                               TABLE OF CONTENTS
                               -----------------


<TABLE>
<CAPTION>
                                                                                      Page
                                                                                      ----
<S>                                                                                   <C>
RECITALS OF THE COMPANY................................................................ 1

                                   ARTICLE I
                       Definitions and Other Provisions
                            of General Application..................................... 1

     Section 1.1  Definitions
                  -----------
           Act......................................................................... 2
           Affiliate................................................................... 2
           Attributable Debt........................................................... 2
           Authenticating Agent........................................................ 3
           Board of Directors.......................................................... 3
           Board Resolution............................................................ 3
           Book-Entry Security......................................................... 3
           Business Day................................................................ 3
           Capital Lease Obligations................................................... 3
           "capital stock" or "stock".................................................. 3
           Commission.................................................................. 3
           Company..................................................................... 3
           "Company Request" or "Company Order"........................................ 4
           Consolidated Net Tangible Assets............................................ 4
           Corporate Trust Office...................................................... 4
           corporation................................................................. 4
           covenant defeasance......................................................... 4
           CUSIP....................................................................... 4
           default..................................................................... 4
           Defaulted Interest.......................................................... 4
           defeasance.................................................................. 4
           Depository.................................................................. 4
           Event of Default............................................................ 4
           Funded Debt................................................................. 4
           Holder...................................................................... 5
</TABLE>
- -------------------------------------

NOTE: This table of contents shall not, for any purpose, be deemed to be a part
      of the Indenture.

                                       ii
<PAGE>

<TABLE>
<S>                                                                               <C>
     Indebtedness................................................................ 5
     Indenture................................................................... 5
     Intangible Assets........................................................... 5
     interest.................................................................... 5
     Interest Payment Date....................................................... 5
     Liens....................................................................... 5
     mandatory sinking fund payment.............................................. 5
     Maturity.................................................................... 5
     Notice of Default........................................................... 6
     Officers' Certificate....................................................... 6
     Opinion of Counsel.......................................................... 6
     optional sinking fund payment............................................... 6
     Original Issue Discount Security............................................ 6
     Outstanding................................................................. 6
     Paying Agent................................................................ 7
     Person...................................................................... 7
     Place of Payment............................................................ 7
     Predecessor Security........................................................ 7
     Principal Property.......................................................... 7
     Redemption Date............................................................. 8
     Redemption Price............................................................ 8
     Regular Record Date......................................................... 8
     Restricted Subsidiary....................................................... 8
     sale and leaseback transaction.............................................. 8
     Secured Funded Debt......................................................... 8
     Securities.................................................................. 8
     "Security Register" and "Security Registrar"................................ 8
     Special Record Date......................................................... 8
     Stated Maturity............................................................. 8
     Subsidiary.................................................................. 8
     Trust Indenture Act......................................................... 8
     Trustee..................................................................... 9
     U.S. Government Obligations................................................. 9
     Vice President.............................................................. 9
     Yield to Maturity........................................................... 9
</TABLE>


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

NOTE: This table of contents shall not, for any purpose, be deemed to be a part
      of the Indenture.

                                      iii
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                           <C>
     Section 1.2  Compliance Certificates and Opinions.......................  9
     Section 1.3  Form of Documents Delivered to Trustee..................... 10
     Section 1.4  Acts of Holders; Record Dates.............................. 11
     Section 1.5  Notices, Etc. to Trustee and Company....................... 12
     Section 1.6  Notice to Holders; Waiver.................................. 12
     Section 1.7  Conflict with Trust Indenture Act.......................... 12
     Section 1.8  Effect of Headings and Table of Contents................... 13
     Section 1.9  Successors and Assigns..................................... 13
     Section 1.10  Separability Clause....................................... 13
     Section 1.11  Benefits of Indenture..................................... 13
     Section 1.12  Governing Law............................................. 13
     Section 1.13  Legal Holidays............................................ 13

                              ARTICLE II
                             Security Forms.................................. 14

     Section 2.1  Forms Generally............................................ 14
     Section 2.2  Form of Face of Security................................... 14
     Section 2.3  Form of Reverse of Security................................ 16
     Section 2.4  Additional Provisions Required in Book-Entry Security...... 20
     Section 2.5  Form of Trustee's Certificate of Authentication............ 21


                              ARTICLE III
                             The Securities.................................. 21

     Section 3.1  Amount Unlimited; Issuable in Series....................... 21
     Section 3.2  Denominations.............................................. 23
     Section 3.3  Execution, Authentication, Delivery and Dating............. 23
     Section 3.4  Temporary Securities....................................... 25
     Section 3.5  Registration, Registration of Transfer and Exchange........ 25
     Section 3.7  Payment of Interest; Interest Rights Preserved............. 28
     Section 3.8  Persons Deemed Owners...................................... 29
     Section 3.9  Cancellation............................................... 29
     Section 3.10  Computation of Interest................................... 29
     Section 3.11  CUSIP Numbers............................................. 30
</TABLE>
- ----------------------------

NOTE: This table of contents shall not, for any purpose, be deemed to be a part
of the Indenture.

                                       iv
<PAGE>

<TABLE>
<S>                                                                             <C>
                                       ARTICLE IV
                               Satisfaction and Discharge.....................  30

     Section 4.1  Satisfaction and Discharge of Indenture.....................  30
     Section 4.2  Application of Trust Money..................................  31

                                       ARTICLE V
                                        Remedies..............................  31

     Section 5.1  Events of Default...........................................  31
     Section 5.2  Acceleration of Maturity; Rescission and Annulment..........  33
     Section 5.3  Collection of Indebtedness and Suits for Enforcement
                       by Trustee.............................................  34
     Section 5.4  Trustee May File Proofs of Claim............................  35
     Section 5.5  Trustee May Enforce Claims Without Possession of Securities.  35
     Section 5.6  Application of Money Collected..............................  35
     Section 5.7  Limitation on Suits.........................................  36
     Section 5.8  Unconditional Right of Holders to Receive Principal, Premium
                       and Interest...........................................  37
     Section 5.9  Restoration of Rights and Remedies..........................  37
     Section 5.10 Rights and Remedies Cumulative..............................  37
     Section 5.11 Delay or Omission Not Waiver................................  37
     Section 5.12 Control by Holders..........................................  37
     Section 5.13 Waiver of Past Defaults.....................................  38
     Section 5.14 Undertaking for Costs.......................................  38
     Section 5.15 Waiver of Stay or Extension Laws............................  38

                                       ARTICLE VI
                                       The Trustee............................  39

     Section 6.1  Certain Duties and Responsibilities.........................  39
     Section 6.2  Notice of Defaults..........................................  39
     Section 6.3  Certain Rights of Trustee...................................  39
     Section 6.4  Not Responsible for Recitals or Issuance of Securities......  40
     Section 6.5  May Hold Securities.........................................  40
     Section 6.6  Money Held in Trust.........................................  41
     Section 6.7  Compensation and Reimbursement..............................  41
</TABLE>
- --------------------
NOTE: This table of contents shall not, for any purpose, be deemed to be a part 
      of the Indenture.



                                       v

<PAGE>

<TABLE>

<S>               <C>                                                        <C>

     Section 6.8  Disqualification; Conflicting Interests................... 41
     Section 6.9  Corporate Trustee Required; Eligibility................... 41
     Section 6.10 Resignation and Removal; Appointment of Successor......... 42
     Section 6.11 Acceptance of Appointment by Successor.................... 43
     Section 6.12 Merger, Conversion, Consolidation or Succession
                      to Business........................................... 44
     Section 6.13 Preferential Collection of Claims Against Company......... 45
     Section 6.14 Appointment of Authenticating Agent....................... 45


                                      ARTICLE VII
                   Holders' Lists and Reports by Trustee and Company........ 47

     Section 7.1  Company to Furnish Trustee Names and Addresses of Holders. 47
     Section 7.2  Preservation of Information; Communications to Holders.... 47
     Section 7.3  Reports by Trustee........................................ 47
     Section 7.4  Reports by Company........................................ 48

                                      ARTICLE VIII
                   Consolidation, Merger, Conveyance, Transfer or Lease..... 48

     Section 8.1  Company May Consolidate, Etc. Only on Certain Terms....... 48
     Section 8.2  Successor Substituted..................................... 49

                                       ARTICLE IX
                                Supplemental Indentures..................... 50

     Section 9.1  Supplemental Indentures Without Consent of Holders........ 50
     Section 9.2  Supplemental Indentures with Consent of Holders........... 51
     Section 9.3  Execution Of Supplemental Indentures...................... 52
     Section 9.4  Effect of Supplemental Indentures......................... 52
     Section 9.5  Conformity with Trust Indenture Act....................... 52
     Section 9.6  Reference in Securities to Supplemental Indentures........ 53

                                      ARTICLE X
                                      Covenants............................. 53

     Section 10.1 Payment of Principal, Premium and Interest................ 53
     Section 10.2 Maintenance of Office or Agency........................... 53
</TABLE>
- ------------------------------

NOTE: This table of contents shall not, for any purpose, be deemed to be a part 
      of the Indenture.
                                       vi

<PAGE>                                                                       
                                                                             
<TABLE>                                                                      
<CAPTION> 
<S>                                                                          <C>
     Section 10.3  Money for Securities Payments to Be Held in Trust........ 54       
     Section 10.4  Statement by Officers as to Default...................... 55      
     Section 10.5  Existence................................................ 55      
     Section 10.6  Restrictions on Secured Funded Debt...................... 55      
     Section 10.7  Limitation on Sales and Leasebacks....................... 57      
     Section 10.8  Restrictions on Funded Debt of Restricted Subsidiaries... 58      
     Section 10.9  Waiver of Certain Covenants.............................. 59      
                                                                                                                        
                                 ARTICLE XI                                          
                          Redemption of Securities.......................... 59      
                                                                                     
     Section 11.1  Applicability of Article................................. 59      
     Section 11.2  Election to Redeem; Notice to Trustee.................... 59      
     Section 11.3  Selection by Trustee of Securities to Be Redeemed........ 60      
     Section 11.4  Notice of Redemption..................................... 60      
     Section 11.5  Deposit of Redemption Price.............................. 61      
     Section 11.6  Securities Payable on Redemption Date.................... 61      
     Section 11.7  Securities Redeemed in Part.............................. 61      
                                                                                                                              
                                  ARTICLE XII                                        
                                 Sinking Funds.............................. 62                                  
                                                                                                                              
     Section 12.1  Applicability of Article................................. 62      
     Section 12.2  Satisfaction of Sinking Fund Payments with Securities.... 62      
     Section 12.3  Redemption of Securities for Sinking Fund................ 63      
                                                                                                                              
                                  ARTICLE XIII                                       
                      Defeasance and Covenant Defeasance.................... 63      
                                                                                                                              
     Section 13.1  Applicability of Article; Company's Option to or                  
                       Covenant Defeasance Effect Defeasance................ 63      
     Section 13.2  Defeasance and Discharge................................. 63      
     Section 13.3  Covenant Defeasance...................................... 64      
     Section 13.4  Conditions to Defeasance or Covenant Defeasance.......... 64      
     Section 13.5  Deposited Money and U.S. Government Obligations to be             
                       Held in Trust; Other Miscellaneous................... 66      
     Section 13.6  Reinstatement............................................ 67
</TABLE>
- -------------------------------

NOTE: This table of contents shall not, for any purpose, be deemed to be a part
      of the Indenture.

                                      vii
<PAGE>
 
- ------------------
NOTE: This table of contents shall not, for any purpose, be deemed to be a part 
      of the Indenture.

                                      viii
<PAGE>
 
          INDENTURE, dated as of April __, 1998 between Nalco Chemical Company,
a corporation duly organized and existing under the laws of the State of
Delaware (herein called the "Company"), having its principal office at One Nalco
Center, Naperville, Illinois 60563-1198, and The Chase Manhattan Bank, a New
York banking corporation, as Trustee (herein called the "Trustee").


                            RECITALS OF THE COMPANY

          The Company has duly authorized the execution and delivery of this
Indenture to provide for the issuance from time to time of its unsecured and
unsubordinated debentures, notes or other evidences of indebtedness to be issued
in one or more series as provided in this Indenture (herein called the
"Securities").

          All things necessary to make this Indenture a valid agreement of the
Company, in accordance with its terms, have been done.

          NOW, THEREFORE, THIS INDENTURE WITNESSETH:

          For and in consideration of the premises and the purchase of the
Securities by the Holders thereof, it is mutually agreed, for the equal and
proportionate benefit of all Holders of the Securities or of series thereof, as
follows:


                                   ARTICLE I

                       Definitions and Other Provisions
                            of General Application

Section 1.1  Definitions.
             ----------- 

          For all purposes of this Indenture, except as otherwise expressly
provided or unless the context otherwise requires:

          (1)  the terms defined in this Article have the meanings assigned to
     them in this Article and include the plural as well as the singular;

          (2)  all other terms used herein which are defined in the Trust
     Indenture Act, either directly or by reference therein, have the meanings
     assigned to them therein;

          (3)  all accounting terms not otherwise defined herein have the
     meanings assigned to them in accordance with generally accepted accounting
     principles, and, except as otherwise herein expressly provided, the term
     "generally accepted accounting

                                       1
<PAGE>
 
     principles" with respect to any computation required or permitted hereunder
     shall mean such accounting principles as are generally accepted at the date
     of such computation; and

          (4)  the words "herein," "hereof" and "hereunder" and other words of
     similar import refer to this Indenture as a whole and not to any particular
     Article, Section or other subdivision.

          "Act," when used with respect to any Holder, has the meaning specified
in Section 1.4.

          "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For the purposes of this definition,
"control" when used with respect to any specified Person means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

          "Attributable Debt" means as to any particular lease under which
either the Company or any Restricted Subsidiary is at the time liable as lessee
for a term of more than 12 months and at any date as of which the amount thereof
is to be determined, the total net obligations of the lessee for rental payments
during the remaining term of the lease (including any period for which such
lease has been extended or may, at the option of the lessor, be extended)
discounted from the respective due dates thereof to such determination date at a
rate per annum equivalent to the greater of (a) the weighted-average Yield to
Maturity of the Outstanding Securities, such average being weighted by the
principal amount of the Outstanding Securities of each series or, in the case of
Original Issue Discount Securities, such amount to be the principal amount of
such outstanding Original Issue Discount Securities that would be due and
payable as of the date of such determination upon a declaration of acceleration
of the maturity thereof pursuant to this Indenture and (b) the interest rate
inherent in such lease (as determined in good faith by the Company), both to be
compounded semi-annually. The net total obligations of the lessee for rental
payments under any such lease for any such period shall be the aggregate amount
of the rent payable by the lessee with respect to such period after excluding
amounts required to be paid on account of maintenance and repairs, services,
insurance, taxes, assessments, water rates and similar charges and contingent
rents (such as those based on sales or monetary inflation). If any lease is
terminable by the lessee upon the payment of a penalty and under the terms of
the lease the termination right is not exercisable until after the determination
date and the amount of such penalty discounted to the determination date as
provided above is less than the net amount of rentals payable after the time as
of which such termination could occur (the "termination time") discounted to the
determination date as provided above, then such discounted penalty amount shall
be used instead of such discounted amount of net rentals payable after the
termination time in calculating the Attributable Debt for such lease. If any
lease is terminable by the lessee upon the payment of a penalty and such
termination right is exercisable on the determination date and the amount of the
net rentals payable under such lease after the determination date discounted to
the determination date as provided above is

                                       2
<PAGE>
 
greater than the amount of such penalty, the "Attributable Debt" for such lease
as of such determination date shall be equal to the amount of such penalty.

          "Authenticating Agent" means any Person authorized by the Trustee
pursuant to Section 6.14 to act on behalf of the Trustee to authenticate
Securities of one or more series.

          "Board of Directors" means either the board of directors of the
Company or any duly authorized committee of that board.

          "Board Resolution" means a copy of a resolution certified by the
Secretary or an Assistant Secretary of the Company to have been duly adopted by
the Board of Directors and to be in full force and effect on the date of such
certification, and delivered to the Trustee.

          "Book-Entry Security" means a Security in the form prescribed in
Sections 2.2 through 2.4 evidencing all or part of a series of Securities,
issued to the Depository for such series or its nominee, and registered in the
name of such Depository or nominee.

          "Business Day," when used with respect to any Place of Payment, means
each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which
banking institutions in that Place of Payment are authorized or obligated by law
or executive order to close.

          "Capital Lease Obligations" of either the Company or any Restricted
Subsidiary means the obligations of such Person to pay rent or other amounts
under any lease of (or other arrangement conveying the right to use) real
property, the term of which extends beyond 12 months, which obligations are
required to be classified and accounted for as a capital lease on a balance
sheet of such Person under generally accepted accounting principles (including
Statement No. 13 of Financial Accounting Standards Board) and, for the purposes
of this Indenture, the amount of such obligation shall be the capitalized amount
thereof, determined in accordance with generally accepted accounting principles
(including such Statement No. 13).

          "capital stock" or "stock" includes capital stock, shares of
beneficial interests and limited partnership interests.

          "Commission" means the Securities and Exchange Commission, as from
time to time constituted, created under the Securities Exchange Act of 1934, as
amended, or, if at any time after the execution of this instrument such
Commission is not existing and performing the duties now assigned to it under
the Trust Indenture Act, then the body performing such duties at such time.

          "Company" means the corporation named as the "Company" in the first
paragraph of this instrument until a successor corporation shall have become
such pursuant to the applicable provisions of this Indenture, and thereafter
"Company" shall mean such successor corporation.

                                       3
<PAGE>
 
          "Company Request" or "Company Order" means a written request or order
signed in the name of the Company by its Chairman of the Board, its President or
a Vice President, and by its Treasurer, an Assistant Treasurer, its Secretary or
an Assistant Secretary, and delivered to the Trustee.

          "Consolidated Net Tangible Assets" means, at any date, the total
assets appearing on the most recent consolidated balance sheet of the Company
and its Subsidiaries as at the end of the fiscal quarter of the Company ending
not more than 135 days prior to such date, prepared in accordance with generally
accepted accounting principles, less (a) investments in and advances to
affiliates as shown on the consolidated balance sheet of the Company and its
Subsidiaries and (b) Intangible Assets.

          "Corporate Trust Office" means the office of the Trustee or any of its
affiliates in Cleveland, Ohio at which at any particular time its corporate
trust business shall be administered, which currently is located at 1660 West
Second Street, Suite 920, Cleveland, Ohio 44113.

          "corporation" means a corporation, association, company, limited
partnership, partnership, joint-stock company, limited liability company or
business trust.

          "covenant defeasance" has the meaning specified in Section 13.3.

          "CUSIP" has the meaning specified in Section 3.11.

          "default" has the meaning specified in Section 6.2.

          "Defaulted Interest" has the meaning specified in Section 3.7.

          "defeasance" has the meaning specified in Section 13.2.

          "Depository" means, with respect to the Securities of any series
issuable or issued in whole or in part in the form of one or more Book-Entry
Securities, the Person designated as Depository for such series by the Company
pursuant to Section 3.1, initially The Depository Trust Company, its nominees
and their respective successors, which Person shall be a clearing agency
registered under the Securities Exchange Act of 1934, as amended.

          "Event of Default" has the meaning specified in Section 5.1.

          "Funded Debt" means (i) any indebtedness of the Company or a
Restricted Subsidiary maturing more than 12 months after the time of computation
thereof, (ii) guarantees of Funded Debt or of dividends of others (except
guarantees in connection with the sale or discount of accounts receivable, trade
acceptances and other paper arising in the ordinary course of business), (iii)
in the case of any Restricted Subsidiary, all preferred stock having mandatory
redemption provisions of such Restricted Subsidiary as reflected on such
Restricted Subsidiary's

                                       4
<PAGE>
 
balance sheet prepared in accordance with generally accepted accounting
principles, and (iv) all Capital Lease Obligations.

          "Holder" means a Person in whose name a Security is registered in the
Security Register.

          "Indebtedness" means, at any date, without duplication, (i) all
obligations for borrowed money of the Company or a Restricted Subsidiary or any
other indebtedness of the Company or a Restricted Subsidiary, evidenced by
bonds, debentures, notes or other similar instruments, and (ii) Funded Debt.

          "Indenture" means this instrument as originally executed or as it may
from time to time be supplemented or amended by one or more indentures
supplemental hereto entered into pursuant to the applicable provisions hereof,
including, for all purposes of this instrument, and any such supplemental
indenture, the provisions of the Trust Indenture Act that are deemed to be a
part of and govern this instrument and any such supplemental indenture,
respectively. The term "Indenture" shall also include the terms of particular
series of Securities established as contemplated by Section 3.1.

          "Intangible Assets" means, at any date, the value (net of any
applicable reserves), as shown on or reflected in the most recent consolidated
balance sheet of the Company and its Subsidiaries as at the end of the fiscal
quarter of the Company ending not more than 135 days prior to such date,
prepared in accordance with generally accepted accounting principles, of: (i)
all trade names, trademarks, licenses, patents, copyrights, service marks,
goodwill and other like intangibles, but excluding, for purposes of this
definition, the ascribed value relating to the assembled sales force and
existing customer lists for any acquisition by the Company or any of its
Subsidiaries after the date of this Indenture, and (ii) unamortized debt
discount and expense, less unamortized premium.

          "interest," when used with respect to an Original Issue Discount
Security which by its terms bears interest only after Maturity, means interest
payable after Maturity.

          "Interest Payment Date," when used with respect to any Security, means
the Stated Maturity of an installment of interest on such Security.

          "Liens" means such pledges, mortgages, security interests and other
liens which secure Secured Funded Debt.

          "mandatory sinking fund payment" has the meaning specified in Section
12.1.

          "Maturity," when used with respect to any Security, means the date on
which the principal of such Security or an installment of principal becomes due
and payable as therein or

                                       5
<PAGE>
 
herein provided, whether at the Stated Maturity or by declaration of
acceleration, call for redemption or otherwise.

          "Notice of Default" has the meaning specified in Section 5.1.

          "Officers' Certificate" means a certificate signed by the Chairman of
the Board, the President, the General Counsel or a Vice President, and by the
Treasurer, an Assistant Treasurer, the Controller or an Assistant Controller,
the Secretary or an Assistant Secretary, of the Company, and delivered to the
Trustee. One of the officers signing an Officers' Certificate given pursuant to
Section 10.4 shall be the principal executive, financial or accounting officer
of the Company.

          "Opinion of Counsel" means a written opinion of counsel, who may be an
employee of or counsel for the Company, and who shall be acceptable to the
Trustee.

          "optional sinking fund payment" has the meaning specified in Section
12.1.

          "Original Issue Discount Security" means any Security which provides
for an amount less than the principal amount thereof to be due and payable upon
a declaration of acceleration of the Maturity thereof pursuant to Section 5.2.

          "Outstanding," when used with respect to Securities, means, as of the
date of determination, all Securities theretofore authenticated and delivered
under this Indenture, except:

          (i)    Securities theretofore canceled by the Trustee or delivered to
     the Trustee for cancellation;

          (ii)   Securities for whose payment or redemption money in the
     necessary amount has been theretofore deposited with the Trustee or any
     Paying Agent (other than the Company) in trust or set aside and segregated
     in trust by the Company (if the Company shall act as its own Paying Agent)
     for the Holders of such Securities; provided, that, if such Securities are
     to be redeemed, notice of such redemption has been duly given pursuant to
     this Indenture or provision therefor satisfactory to the Trustee has been
     made;

          (iii)  Securities which have been paid pursuant to Section 3.6 or in
     exchange for or in lieu of which other Securities have been authenticated
     and delivered pursuant to this Indenture, other than any such Securities in
     respect of which there shall have been presented to the Trustee proof
     satisfactory to it that such Securities are held by a bona fide purchaser
     in whose hands such Securities are valid obligations of the Company; and

          (iv)   Securities that have been defeased pursuant to Section 13.2;

provided, however, that in determining whether the Holders of the requisite
principal amount of the Outstanding Securities have given any request, demand,
authorization, direction, notice,

                                       6
<PAGE>
 
consent or waiver hereunder, (i) the principal amount of an Original Issue
Discount Security that shall be deemed to be Outstanding shall be the amount of
the principal thereof that would be due and payable as of the date of such
determination upon acceleration of the Maturity thereof pursuant to Section 5.2,
(ii) the principal amount of a Security denominated in one or more foreign
currencies or currency units shall be the U.S. dollar equivalent, determined in
the manner provided as contemplated by Section 3.1 on the date of original
issuance of such Security, of the principal amount (or, in the case of an
Original Issue Discount Security, the U.S. dollar equivalent on the date of
original issuance of such Security of the amount determined as provided in (i)
above) of such Security, and (iii) Securities owned by the Company or any other
obligor upon the Securities or any Affiliate of the Company or of such other
obligor shall be disregarded and deemed not to be Outstanding, except that, in
determining whether the Trustee shall be protected in relying upon any such
request, demand, authorization, direction, notice, consent or waiver, only
Securities which the Trustee knows to be so owned shall be so disregarded.
Securities so owned that have been pledged in good faith may be regarded as
Outstanding if the pledgee establishes to the satisfaction of the Trustee the
pledgee's right so to act with respect to such Securities and that the pledgee
is not the Company or any other obligor upon the Securities or any Affiliate of
the Company or of such other obligor.

          "Paying Agent" means any Person authorized by the Company to pay the
principal of or any premium or interest on any Securities on behalf of the
Company.

          "Person" means any individual, corporation, partnership, limited
liability company, joint venture, trust, unincorporated organization or
government or any agency or political subdivision thereof.

          "Place of Payment," when used with respect to the Securities of any
series, means the place or places where the principal of and any premium and
interest on the Securities of that series are payable as specified as
contemplated by Section 3.1.

          "Predecessor Security" of any particular Security means every previous
Security evidencing all or a portion of the same debt as that evidenced by such
particular Security; and, for the purposes of this definition, any Security
authenticated and delivered under Section 3.6 in exchange for or in lieu of a
mutilated, destroyed, lost or stolen Security shall be deemed to evidence the
same debt as the mutilated, destroyed, lost or stolen Security.

          "Principal Property" means any building, structure or other facility,
together with the land upon which it is erected and fixtures comprising a part
thereof, used primarily for manufacturing and located in the United States, the
gross book value (without deduction of any reserve for depreciation) of which on
the date as of which the determination is being made is an amount which exceeds
2% of the Consolidated Net Tangible Assets, other than any such building,
structure or other facility or any portion thereof or any such fixture (together
with the land upon which it is erected and fixtures comprising a part thereof)
which, in the opinion of the Board of Directors of the Company as evidenced by a
resolution of the Board of Directors

                                       7
<PAGE>
 
to such effect which is provided to the Trustee, is not of material importance
to the total business conducted by the Company and its Subsidiaries taken as a
whole.

          "Redemption Date," when used with respect to any Security to be
redeemed, means the date fixed for such redemption by or pursuant to this
Indenture.

          "Redemption Price," when used with respect to any Security to be
redeemed, means the price at which it is to be redeemed pursuant to this
Indenture.

          "Regular Record Date" for the interest payable on any Interest Payment
Date on the Securities of any series means the date specified for that purpose
as contemplated by Section 3.1.

          "Restricted Subsidiary" means, at any date, each Subsidiary organized
in the United States with total assets, as reflected in the most recent balance
sheet of the Subsidiary as at the end of the fiscal quarter of such Subsidiary
ending not more than 135 days prior to such date, prepared in accordance with
generally accepted accounting principles, greater than 2% of Consolidated Net
Tangible Assets. Restricted Subsidiaries shall not include: (a) Nalco/Exxon
Energy Chemicals, Inc., (b) Nalco/Exxon Energy Chemicals, L.P., (c) Nalco TWO,
Inc. (d) Treated Water Outsourcing, a Nalco/U.S. Filter Joint Venture, (e) Nalco
Leasing Corporation, and (f) any Subsidiary of any of the foregoing.

          "sale and leaseback transaction" has the meaning specified in Section
10.7.

          "Secured Funded Debt" means Funded Debt which is secured by any pledge
of, or mortgage, security interest or other lien on any (i) Principal Property
(whether owned on the date hereof or hereafter acquired or created), (ii) shares
of stock owned by the Company or a Subsidiary in a Restricted Subsidiary or
(iii) indebtedness of a Restricted Subsidiary.

          "Securities" has the meaning stated in the first recital of this
Indenture and more particularly means any Securities authenticated and delivered
under this Indenture.

          "Security Register" and "Security Registrar" have the respective
meanings specified in Section 3.5.

          "Special Record Date" for the payment of any Defaulted Interest means
a date fixed by the Trustee pursuant to Section 3.7.

          "Stated Maturity," when used with respect to any Security or any
installment of principal thereof or interest thereon, means the date specified
in such Security as the fixed date on which the principal of such Security or
such installment of principal or interest is due and payable.

                                       8
<PAGE>
 
          "Subsidiary" means any corporation of which at least a majority of the
outstanding stock, which under ordinary circumstances (not dependent upon the
happening of a contingency) has voting power to elect a majority of the board of
directors of such corporation (or similar management body), is owned directly or
indirectly by the Company or by one or more Subsidiaries of the Company, or by
the Company and one or more Subsidiaries.

          "Trust Indenture Act" means the Trust Indenture Act of 1939 as in
force at the date as of which this instrument was executed; provided, however,
that if the Trust Indenture Act of 1939 is amended after such date, "Trust
Indenture Act" means, to the extent required by any such amendment, the Trust
Indenture Act of 1939 as so amended.

          "Trustee" means the Person named as the "Trustee" in the first
paragraph of this instrument until a successor Trustee shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Trustee" shall mean or include each Person who is then a Trustee hereunder, and
if at any time there is more than one such Person, "Trustee" as used with
respect to the Securities of any series shall mean the Trustee with respect to
Securities of that series.

          "U.S. Government Obligations" has the meaning specified in Section
13.4.

          "Vice President," when used with respect to the Company or the
Trustee, means any vice president, whether or not designated by a number or a
word or words added before or after the title "vice president".

          "Yield to Maturity" means the yield to maturity, calculated at the
time of issuance of a series of Securities or, if applicable, at the most recent
redetermination of interest on such series and calculated in accordance with
generally accepted financial practice.

Section 1.2  Compliance Certificates and Opinions.
             -------------------------------------

          Upon any application or request by the Company to the Trustee to take
any action under any provision of this Indenture, the Company shall furnish to
the Trustee such certificates and opinions as may be required under the Trust
Indenture Act. Each such certificate or opinion shall be given in the form of an
Officers' Certificate, if to be given by an officer of the Company, or an
Opinion of Counsel, if to be given by counsel, and shall comply with the
requirements of the Trust Indenture Act and any other requirements set forth in
this Indenture. In the case of any such application or request as to which the
furnishing of such documents is specifically required by any provision of this
Indenture relating to such particular application or request, however, no
additional certificate or opinion need be furnished.

          Every certificate or opinion with respect to compliance with a
condition or covenant provided for in this Indenture shall include

                                       9
<PAGE>
 
          (1)  a statement that each individual signing such certificate or
     opinion has read such covenant or condition and the definitions herein
     relating thereto;

          (2)  a brief statement as to the nature and scope of the examination
     or investigation upon which the statements or opinions contained in such
     certificate or opinion are based;

          (3)  a statement that, in the opinion of each such individual, he has
     made such examination or investigation as is necessary to enable him to
     express an informed opinion as to whether or not such covenant or condition
     has been complied with; and

          (4)  a statement as to whether, in the opinion of each such
     individual, such condition or covenant has been complied with.

 Section 1.3  Form of Documents Delivered to Trustee.
              --------------------------------------

          In any case where several matters are required to be certified by, or
covered by an opinion of, any specified Person, it is not necessary that all
such matters be certified by, or covered by the opinion of, only one such
Person, or that they be so certified or covered by only one document, but one
such Person may certify or give an opinion with respect to some matters and one
or more other such Persons as to other matters, and any such Person may certify
or give an opinion as to such matters in one or several documents.

          Any certificate or opinion of an officer of the Company may be based,
insofar as it relates to legal matters, upon a certificate or opinion of, or
representations by, counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to the matters upon which his certificate or opinion is based are
erroneous. Any such certificate or opinion of counsel may be based, insofar as
it relates to factual matters, upon a certificate or opinion of, or
representations by, an officer or officers of the Company stating that the
information with respect to such factual matters is in the possession of the
Company, unless such counsel knows, or in the exercise of reasonable care should
know, that the certificate or opinion or representations with respect to such
matters are erroneous.

          Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated and
form one instrument.

Section 1.4  Acts of Holders; Record Dates.
             -----------------------------

          (a)  Any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Indenture to be given or taken by
Holders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person or by agent duly
appointed in writing; and, except as herein otherwise expressly

                                      10
<PAGE>
 
provided, such action shall become effective when such instrument or instruments
are delivered to the Trustee and, where it is hereby expressly required, to the
Company. Such instrument or instruments (and the action embodied therein and
evidenced thereby) are herein sometimes referred to as the "Act" of the Holders
signing such instrument or instruments. Proof of execution of any such
instrument or of a writing appointing any such agent shall be sufficient for any
purpose of this Indenture and (subject to Section 6.1) conclusive in favor of
the Trustee and the Company, if made in the manner provided in this Section.

          (b)  The fact and date of the execution by any Person of any such
instrument or writing may be proved by the affidavit of a witness of such
execution or by a certificate of a notary public or other officer authorized by
law to take acknowledgments of deeds, certifying that the individual signing
such instrument or writing acknowledged to him the execution thereof. Where such
execution is by a signer acting in a capacity other than his individual
capacity, such certificate or affidavit shall also constitute sufficient proof
of his authority. The fact and date of the execution of any such instrument or
writing, or the authority of the Person executing the same, may also be proved
in any other manner which the Trustee deems sufficient.

          (c)  The Company may, in the circumstances permitted by the Trust
Indenture Act, fix any day as the record date for the purpose of determining the
Holders of Securities of any series entitled to give or take any request,
demand, authorization, direction, notice, consent, waiver or other action, or to
vote on any action, authorized or permitted to be given or taken by Holders of
Securities of such series. If not set by the Company prior to the first
solicitation of a Holder of Securities of such series made by any Person in
respect of any such action, or, in the case of any such vote, prior to such
vote, the record date for any such action or vote shall be the 30th day (or, if
later, the date of the most recent list of Holders required to be provided
pursuant to Section 7.1) prior to such first solicitation or vote, as the case
may be. With regard to any record date for action to be taken by the Holders of
one or more series of Securities, only the Holders of Securities of such series
on such date (or their duly designated proxies) shall be entitled to give or
take, or vote on, the relevant action.

          (d)  The ownership of Securities shall be proved by the Security
Register.

          (e)  Any request, demand, authorization, direction, notice, consent,
waiver or other Act of the Holder of any Security shall bind every future Holder
of the same Security and the Holder of every Security issued upon the
registration of transfer thereof or in exchange therefor or in lieu thereof in
respect of anything done, omitted or suffered to be done by the Trustee or the
Company in reliance thereon, whether or not notation of such action is made upon
such Security.

Section 1.5  Notices, Etc. to Trustee and Company.
             ------------------------------------

          Any request, demand, authorization, direction, notice, consent, waiver
or Act of Holders or other document provided or permitted by this Indenture to
be made upon, given or furnished to, or filed with,

                                      11
<PAGE>
 
          (1)  the Trustee by any Holder or by the Company shall be sufficient
     for every purpose hereunder if made, given, furnished or filed in writing
     to or with the Trustee at its Corporate Trust Office, Attention: Mr. David
     Kovach, or

          (2)  the Company by the Trustee or by any Holder shall be sufficient
     for every purpose hereunder (unless otherwise herein expressly provided) if
     in writing and mailed, first-class postage prepaid, to the Company
     addressed to it at the address of its principal office specified in the
     first paragraph of this instrument, Attention: Treasurer and General
     Counsel, or at any other address previously furnished in writing to the
     Trustee by the Company.

 Section 1.6  Notice to Holders; Waiver.

          Where this Indenture provides for notice to Holders of any event, such
notice shall be sufficiently given (unless otherwise herein expressly provided)
if in writing and mailed, first-class postage prepaid, to each Holder affected
by such event, at his address as it appears in the Security Register, not later
than the latest date (if any), and not earlier than the earliest date (if any),
prescribed for the giving of such notice. In any case where notice to Holders is
given by mail, neither the failure to mail such notice, nor any defect in any
notice so mailed, to any particular Holder shall affect the sufficiency of such
notice with respect to other Holders. Where this Indenture provides for notice
in any manner, such notice may be waived in writing by the Person entitled to
receive such notice, either before or after the event, and such waiver shall be
the equivalent of such notice. Waivers of notice by Holders shall be filed with
the Trustee, but such filing shall not be a condition precedent to the validity
of any action taken in reliance upon such waiver.

          In case by reason of the suspension of regular mail service or by
reason of any other cause it shall be impracticable to give such notice by mail,
then such notification as shall be made as shall be satisfactory to the Trustee
shall constitute a sufficient notification for every purpose hereunder.

Section 1.7  Conflict with Trust Indenture Act.

          If any provision hereof limits, qualifies or conflicts with a
provision of the Trust Indenture Act that is required under such Act to be a
part of and govern this Indenture, the latter provision shall control. If any
provision of this Indenture modifies or excludes any provision of the Trust
Indenture Act that may be so modified or excluded, the latter provision shall be
deemed to apply to this Indenture as so modified or to be excluded, as the case
may be.

Section 1.8  Effect of Headings and Table of Contents.

          The Article and Section headings herein, the reconciliation and tie
with certain provisions of the Trust Indenture Act, and the Table of Contents
are for convenience only and shall not affect the construction hereof.

                                      12
<PAGE>
 
Section 1.9  Successors and Assigns.

          All covenants and agreements in this Indenture by the Company shall
bind its successors and assigns, whether so expressed or not.

Section 1.10  Separability Clause.

          In case any provision in this Indenture or in the Securities shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

Section 1.11  Benefits of Indenture.

          Nothing in this Indenture or in the Securities, express or implied,
shall give to any Person, other than the parties hereto and their successors
hereunder and the Holders, any benefit or any legal or equitable right, remedy
or claim under this Indenture.

Section 1.12  Governing Law.

          This Indenture and the Securities shall be governed by and construed
in accordance with the laws of the State of New York without giving effect to
the conflict of laws provisions thereof.

Section 1.13  Legal Holidays.

          In any case where any Interest Payment Date, Redemption Date or Stated
Maturity of any Security shall not be a Business Day at any Place of Payment,
then (notwithstanding any other provision of this Indenture or of the Securities
(other than a provision of the Securities of any series which specifically
states that such provision shall apply in lieu of this Section)) payment of
interest or principal (and premium, if any) need not be made at such Place of
Payment on such date, but may be made on the next succeeding Business Day at
such Place of Payment with the same force and effect as if made on the Interest
Payment Date or Redemption Date, or at the Stated Maturity; provided, however,
that no interest shall accrue for the period from and after such Interest
Payment Date, Redemption Date or Stated Maturity, as the case may be.

                                      13
<PAGE>
 
                                  ARTICLE II

                                Security Forms

Section 2.1  Forms Generally.

          The Securities of each series shall be in substantially the form set
forth in this Article, or in such other form as shall be established by or
pursuant to a Board Resolution or in one or more indentures supplemental hereto,
in each case with such appropriate insertions, omissions, substitutions and
other variations as are required or permitted by this Indenture, and may have
such letters, numbers or other marks of identification and such legends or
endorsements placed thereon as may be required to comply with the rules of any
securities exchange or as may, consistently herewith, be determined by the
officers executing such Securities, as evidenced by their execution of the
Securities. If the form of Securities of any series is established by action
taken pursuant to a Board Resolution, a copy of an appropriate record of such
action shall be certified by the Secretary or an Assistant Secretary of the
Company and delivered to the Trustee at or prior to the delivery of the Company
Order contemplated by Section 3.3 for the authentication and delivery of such
Securities.

          The Trustee's certificate of authentication shall be in substantially
the form set forth in Section 2.5.

          The definitive Securities shall be printed, lithographed or engraved
on steel engraved borders or may be produced in any other manner, all as
determined by the officers executing such Securities, as evidenced by their
execution of such Securities.

Section 2.2  Form of Face of Security.

          [Insert any legend required by the Internal Revenue Code and the
regulations thereunder.]


                            Nalco Chemical Company

                              ...................


No. .......                                                         $...........

                                                            CUSIP No............


          Nalco Chemical Company, a corporation duly organized and existing
under the laws of the State of Delaware (herein called the "Company," which term
includes any successor

                                      14
<PAGE>
 
corporation under the Indenture hereinafter referred to), for value received,
hereby promises to pay to .............................., or registered assigns,
the principal sum of .................... Dollars on .........................
[if the Security is to bear interest prior to Maturity, insert --, and to pay
interest thereon from ......... or from the most recent Interest Payment Date to
which interest has been paid or duly provided for, semi-annually on ...........
and ............ in each year, commencing ................, at the rate of
 .....% per annum, until the principal hereof is paid or made available for
payment [if applicable, insert -- , and (to the extent that the payment of such
interest shall be legally enforceable) at the rate of .......% per annum on any
overdue principal and premium and on any overdue installment of interest.] The
interest so payable, and punctually paid or duly provided for, on any Interest
Payment Date will, as provided in such Indenture, be paid to the Person in whose
name this Security (or one or more Predecessor Securities) is registered at the
close of business on the Regular Record Date for such interest, which shall be
the ........... or ......... (whether or not a Business Day), as the case may
be, next preceding such Interest Payment Date. Any such interest not so
punctually paid or duly provided for will forthwith cease to be payable to the
Holder on such Regular Record Date and may either be paid to the Person in whose
name this Security (or one or more Predecessor Securities) is registered at the
close of business on a Special Record Date for the payment of such Defaulted
Interest to be fixed by the Trustee, notice whereof shall be given to Holders of
Securities of this series not less than 10 days prior to such Special Record
Date, or be paid at any time in any other lawful manner not inconsistent with
the requirements of any securities exchange on which the Securities of this
series may be listed, and upon such notice as may be required by such exchange,
all as more fully provided in said Indenture].

          [If the Security is not to bear interest prior to Maturity, insert --
The principal of this Security shall not bear interest except in the case of a
default in payment of principal upon acceleration, upon redemption or at Stated
Maturity and in such case the overdue principal of this Security shall bear
interest at the rate of ........% per annum (to the extent that the payment of
such interest shall be legally enforceable), which shall accrue from the date of
such default in payment to the date payment of such principal has been made or
duly provided for. Interest on any overdue principal shall be payable on demand.
Any such interest on any overdue principal that is not so paid on demand shall
bear interest at the rate of ........% per annum (to the extent that the payment
of such interest shall be legally enforceable), which shall accrue from the date
of such demand for payment to the date payment of such interest has been made or
duly provided for, and such interest shall also be payable on demand.]

          Payment of the principal of (and premium, if any) and [if applicable,
insert -- any such] interest on this Security will be made at the office or
agency of the Company maintained for that purpose in New York, New York in such
coin or currency of the United States of America as at the time of payment is
legal tender for payment of public and private debts [if applicable, insert --;
provided, however, that at the option of the Company payment of interest may be
made by check mailed to the address of the Person entitled thereto as such
address shall appear in the Security Register].

                                      15
<PAGE>
 
          Reference is hereby made to the further provisions of this Security
set forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

          Unless the certificate of authentication hereon has been executed by
the Trustee referred to on the reverse hereof by manual signature, this Security
shall not be entitled to any benefit under the Indenture or be valid or
obligatory for any purpose.

          IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed under its corporate seal.

                                        NALCO CHEMICAL COMPANY


Dated:  
       ------------------------
                                        By:
                                            -------------------

Attest:

 .....................


Section 2.3  Form of Reverse of Security.

          This Security is one of a duly authorized issue of securities of the
Company (herein called the "Securities"), issued and to be issued in one or more
series under an Indenture, dated as of .............. (herein called the
"Indenture"), between the Company and ___________________________], as Trustee
(herein called the "Trustee," which term includes any successor trustee under
the Indenture), to which Indenture and all indentures supplemental thereto
reference is hereby made for a statement of the respective rights, limitations
of rights, duties and immunities thereunder of the Company, the Trustee and the
Holders of the Securities and of the terms upon which the Securities are, and
are to be, authenticated and delivered. This Security is one of the series
designated on the face hereof [, limited in aggregate principal amount to $
 .............].

          [If applicable, insert -- The Securities of this series are subject to
redemption upon not less than 30 days' notice by mail, [if applicable, insert --
(1) on ........ in any year commencing with the year ..... and ending with the
year ...... through operation of the sinking fund for this series at a
Redemption Price equal to 100% of the principal amount, and (2)] at any time [on
or after ..........., 19..], as a whole or in part, at the election of the
Company, at the following Redemption Prices (expressed as percentages of the
principal amount): If redeemed [on or before .........., ___%, and if redeemed]
during the 12-month period beginning ............... of the years indicated,


                                      16
<PAGE>
 
                      Redemption                                      Redemption
Year                    Price                   Year                    Price
- ----                    -----                   ----                    -----



and thereafter at a Redemption Price equal to ...... % of the principal amount,
together in the case of any such redemption [if applicable, insert -- (whether
through operation of the sinking fund or otherwise)] with accrued interest to
the Redemption Date, but interest installments whose Stated Maturity is on or
prior to such Redemption Date will be payable to the Holders of such Securities,
or one or more Predecessor Securities, of record at the close of business on the
relevant Record Dates referred to on the face hereof, all as provided in the
Indenture.]

          [If applicable, insert -- The Securities of this series are subject to
redemption upon not less than 30 days' notice by mail, (1) on .............. in
any year commencing with the year ..... and ending with the year ..... through
operation of the sinking fund for this series at the Redemption Prices for
redemption through operation of the sinking fund (expressed as percentages of
the principal amount) set forth in the table below, and (2) at any time [on or
after ........], as a whole or in part, at the election of the Company, at the
Redemption Prices for redemption otherwise than through operation of the sinking
fund (expressed as percentages of the principal amount) set forth in the table
below: If redeemed during the 12-month period beginning ............. of the
years indicated,

                                      17
<PAGE>
 
              Redemption Price
                For Redemption          Redemption Price For
              Through Operation         Redemption Otherwise    
                   of the               Than Through Operation
Year            Sinking Fund             of the Sinking Fund
- ----            ------------             -------------------



and thereafter at a Redemption Price equal to .....% of the principal amount,
together in the case of any such redemption (whether through operation of the
sinking fund or otherwise) with accrued interest to the Redemption Date, but
interest installments whose Stated Maturity is on or prior to such Redemption
Date will be payable to the Holders of such Securities, or one or more
Predecessor Securities, of record at the close of business on the relevant
Record Dates referred to on the face hereof, all as provided in the Indenture.]

          [Notwithstanding the foregoing, the Company may not, prior to
 ..........., redeem any Securities of this series as contemplated by [Clause (2)
of] the preceding paragraph as a part of, or in anticipation of, any refunding
operation by the application, directly or indirectly, of moneys borrowed having
an interest cost to the Company (calculated in accordance with generally
accepted financial practice) of less than .....% per annum.]

          [The sinking fund for this series provides for the redemption on
 .................. in each year beginning with the year ............... and
ending with the year ................ of [not less than $.......... ("mandatory
sinking fund") and not more than] $............. aggregate principal amount of
Securities of this series. Securities of this series acquired or redeemed by the
Company otherwise than through [mandatory] sinking fund payments may be credited
against subsequent [mandatory] sinking fund payments otherwise required to be
made [in the inverse order in which they become due].]

          [If the Security is subject to redemption, insert -- In the event of
redemption of this Security in part only, a new Security or Securities of this
series and of like tenor for the

                                      18
<PAGE>
 
unredeemed portion hereof will be issued in the name of the Holder hereof upon
the cancellation hereof.]

          [If the Security is not an Original Issue Discount Security, insert --
If an Event of Default with respect to Securities of this series shall occur and
be continuing, the principal of the Securities of this series may be declared
due and payable in the manner and with the effect provided in the Indenture.]

          [If the Security is an Original Issue Discount Security, insert -- If
an Event of Default with respect to Securities of this series shall occur and be
continuing, an amount of principal of the Securities of this series may be
declared due and payable in the manner and with the effect provided in the
Indenture.  Such amount shall be equal to -- insert formula for determining the
amount.  Upon payment (i) of the amount of principal so declared due and payable
and (ii) of interest on any overdue principal and overdue interest (in each case
to the extent that the payment of such interest shall be legally enforceable),
all of the Company's obligations in respect of the payment of the principal of
and interest, if any, on the Securities of this series shall terminate.]

          [The Indenture contains provisions for defeasance at any time of [the
entire indebtedness of this Security or] certain restrictive covenants and the
related Events of Default with respect to this Security [, in each case] upon
compliance with certain conditions set forth therein.]

          The Indenture permits, with certain exceptions as therein provided,
the amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Holders of the Securities of each series to be
affected under the Indenture at any time by the Company and the Trustee with the
consent of the Holders of a majority in principal amount of the Securities at
the time Outstanding of each series to be affected.  The Indenture also contains
provisions permitting the Holders of specified percentages in principal amount
of the Securities of each series at the time Outstanding, on behalf of the
Holders of all Securities of such series, to waive compliance by the Company
with certain provisions of the Indenture and certain past defaults under the
Indenture and their consequences.  Any such consent or waiver by the Holder of
this Security shall be conclusive and binding upon such Holder and upon all
future Holders of this Security and of any Security issued upon the registration
of transfer hereof or in exchange herefor or in lieu hereof, whether or not
notation of such consent or waiver is made upon this Security.

          No reference herein to the Indenture and no provision of this Security
or of the Indenture shall alter or impair the obligation of the Company, which
is absolute and unconditional, to pay the principal of and any premium and
interest on this Security at the times, place and rate, and in the coin or
currency, herein prescribed.

          As provided in the Indenture and subject to certain limitations
therein set forth, the transfer of this Security is registerable in the Security
Register, upon surrender of this

                                      19
<PAGE>
 
Security for registration of transfer at the office or agency of the Company in
any place where the principal of and any premium and interest on this Security
are payable, duly endorsed by, or accompanied by a written instrument of
transfer in form satisfactory to the Company and the Security Registrar duly
executed by, the Holder hereof or his attorney duly authorized in writing, and
thereupon one or more new Securities of this series and of like tenor, of
authorized denominations and for the same Stated Maturity and aggregate
principal amount, will be issued to the designated transferee or transferees.

          The Securities of this series are issuable only in registered form
without coupons in denominations of $.......... and any integral multiple
thereof.  As provided in the Indenture and subject to certain limitations
therein set forth, Securities of this series are exchangeable for a like
aggregate principal amount of Securities of this series and of like tenor of a
different authorized denomination, as requested by the Holder surrendering the
same.

          No service charge shall be made for any such registration of transfer
or exchange, but the Company may require payment of a sum sufficient to cover
any tax or other governmental charge payable in connection therewith.

          Prior to due presentment of this Security for registration of
transfer, the Company, the Trustee and any agent of the Company or the Trustee
may treat the Person in whose name this Security is registered as the owner
hereof for all purposes, whether or not this Security be overdue, and neither
the Company, the Trustee nor any such agent shall be affected by notice to the
contrary.

          Interest on this Security shall be computed on the basis of [a 360-day
year of twelve 30-day months][the actual number of days elapsed and a 360-day
year].

          All terms used in this Security which are defined in the Indenture
shall have the meanings assigned to them in the Indenture.

          This Security shall be governed by and construed in accordance with
the laws of the State of New York without giving effect to the conflict of laws
provisions thereof.

 Section 2.4  Additional Provisions Required in Book-Entry Security.

          Any Book-Entry Security issued hereunder shall, in addition to the
provisions contained in Sections 2.2 and 2.3, bear a legend in substantially the
following form:

          "This Security is a Book-Entry Security within the meaning of the
     Indenture hereinafter referred to and is registered in the name of a
     Depository or a nominee of a Depository.  This Security is exchangeable for
     Securities registered in the name of a person other than the Depository or
     its nominee only in the limited circumstances described in the Indenture
     and may not be transferred except as a whole by the Depository to a nominee
     of the Depository or by a

                                      20
<PAGE>
 
     nominee of the Depository to the Depository or another nominee of the
     Depository."

 Section 2.5  Form of Trustee's Certificate of Authentication.

          The Trustee's certificate of authentication shall be in substantially
the following form:

          This is one of the Securities of the series designated therein
     referred to in the within-mentioned Indenture.



                                               ---------------------------------
                                                          As Trustee


                                               By:
                                                  ------------------------------
                                                      Authorized Signatory


                                  ARTICLE III

                                The Securities

 Section 3.1  Amount Unlimited; Issuable in Series.

          The aggregate principal amount of Securities which may be
authenticated and delivered under this Indenture is unlimited.

          The Securities may be issued in one or more series. There shall be
established in or pursuant to a Board Resolution and, subject to Section 3.3,
set forth, or determined in the manner provided in an Officers' Certificate, or
established in one or more indentures supplemental hereto, prior to the issuance
of Securities of any series:

          (1)  the title of the Securities of the series (which shall
     distinguish the Securities of the series from Securities of any other
     series);

          (2)  any limit upon the aggregate principal amount of the Securities
     of the series which may be authenticated and delivered under this Indenture
     (except for Securities authenticated and delivered upon registration of
     transfer of, or in exchange for, or in lieu of, other Securities of the
     series pursuant to Section 3.4, 3.5, 3.6, 9.6 or 11.7 and except for any
     Securities which, pursuant to Section 3.3, are deemed never to have been
     authenticated and delivered hereunder);

                                      21
<PAGE>
 
          (3)  the Person to whom any interest on a Security of the series shall
     be payable, if other than the Person in whose name that Security (or one or
     more Predecessor Securities) is registered at the close of business on the
     Regular Record Date for such interest;

          (4)  the date or dates on which the principal of the Securities of the
     series is payable;

          (5)  the rate or rates at which the Securities of the series shall
     bear interest, if any, or the method of calculating such rate or rates of
     interest, the date or dates from which such interest shall accrue, the
     Interest Payment Dates on which any such interest shall be payable and the
     Regular Record Date for any interest payable on any Interest Payment Date;

          (6)  the place or places where the principal of and any premium and
     interest on Securities of the series shall be payable;

          (7)  the period or periods within which, the price or prices at which
     and the terms and conditions upon which Securities of the series may be
     redeemed, in whole or in part, at the option of the Company;

          (8)  the obligation, if any, of the Company to redeem, purchase or
     repay Securities of the series pursuant to any sinking fund or analogous
     provisions or at the option of a Holder thereof and the period or periods
     within which, the price or prices at which and the terms and conditions
     upon which Securities of the series shall be redeemed, purchased or repaid,
     in whole or in part, pursuant to such obligation;

          (9)  if other than denominations of $1,000 and any integral multiple
     thereof, the denominations in which Securities of the series shall be
     issuable;

          (10) the currency, currencies or currency units in which payment of
     the principal of and any premium and interest on any Securities of the
     series shall be payable if other than the currency of the United States of
     America and the manner of determining the equivalent thereof in the
     currency of the United States of America for purposes of the definition of
     "Outstanding" in Section 1.1;

          (11) if the amount of payments of principal of or any premium or
     interest on any Securities of the series may be determined with reference
     to an index or formula, the manner in which such amounts shall be
     determined;

          (12) if the principal of or any premium or interest on any Securities
     of the series is to be payable, at the election of the Company or a Holder
     thereof, in one or more currencies or currency units other than that or
     those in which the Securities are stated to be payable, the currency,
     currencies or currency units in which payment of the principal

                                      22
<PAGE>
 
     of and any premium and interest on Securities of such series as to which
     such election is made shall be payable, and the periods within which and
     the terms and conditions upon which such election is to be made;

          (13) the application, if any, of Section 13.2 or 13.3 to the
     Securities of the series;

          (14) whether the Securities of the series shall be issued in whole or
     in part in the form of one or more Book-Entry Securities and, in such case,
     the Depository with respect to such Book-Entry Security or Securities and
     the circumstances under which any Book-Entry Security may be registered for
     transfer or exchange, or authenticated and delivered, in the name of a
     Person other than such Depository or its nominee, if other than as set
     forth in Section 3.5;

          (15) if other than the principal amount thereof, the portion of the
     principal amount of Securities of the series which shall be payable upon
     declaration of acceleration of the Maturity thereof pursuant to Section
     5.2; and

          (16) any other terms of the series (which terms shall not be
     inconsistent with the provisions of this Indenture).

          All Securities of any one series shall be substantially identical
except as to denomination and except as may otherwise be provided in or pursuant
to the Board Resolution referred to above and (subject to Section 3.3) set
forth, or determined in the manner provided, in the Officers' Certificate
referred to above or in any such indenture supplemental hereto.

          If any of the terms of the series are established by action taken
pursuant to a Board Resolution, a copy of an appropriate record of such action
shall be certified by the Secretary or an Assistant Secretary of the Company and
delivered to the Trustee at or prior to the delivery of the Officers'
Certificate setting forth the terms of the series.

Section 3.2  Denominations.

          The Securities of each series shall be issuable in registered form
without coupons in such denominations as shall be specified as contemplated by
Section 3.1. In the absence of any such provisions with respect to the
Securities of any series, the Securities of such series shall be issuable in
denominations of $1,000 and any integral multiple thereof.

Section 3.3  Execution, Authentication, Delivery and Dating.

          The Securities shall be executed on behalf of the Company by its
Chairman of the Board, its President or one of its Vice Presidents, its
Treasurer or one of its Assistant Treasurers, under its corporate seal
reproduced thereon attested by its Secretary or one of its

                                      23
<PAGE>
 
Assistant Secretaries.  The signature of any of these officers on the Securities
may be manual or facsimile.

          Securities bearing the manual or facsimile signatures of individuals
who were at any time the proper officers of the Company shall bind the Company,
notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the authentication and delivery of such Securities or did not
hold such offices at the date of such Securities.

          At any time and from time to time after the execution and delivery of
this Indenture, the Company may deliver Securities of any series executed by the
Company to the Trustee for authentication, together with a Company Order for the
authentication and delivery of such Securities, and the Trustee in accordance
with the Company Order shall authenticate and deliver such Securities.  If the
form or terms of the Securities of the series have been established in or
pursuant to one or more Board Resolutions as permitted by Sections 2.1 and 3.1,
in authenticating such Securities, and accepting the additional responsibilities
under this Indenture in relation to such Securities, the Trustee shall be
entitled to receive, and (subject to Section 6.1) shall be fully protected in
relying upon, an Opinion of Counsel stating,

     (a)  if the form of such Securities has been established by or pursuant to
Board Resolution as permitted by Section 2.1, that such form has been
established in conformity with the provisions of this Indenture;

     (b)  if the terms of such Securities have been established by or pursuant
to Board Resolution as permitted by Section 3.1, that such terms have been
established in conformity with the provisions of this Indenture; and

     (c)  that such Securities, when authenticated and delivered by the Trustee
and issued by the Company in the manner and subject to any conditions specified
in such Opinion of Counsel, will constitute valid and legally binding
obligations of the Company enforceable in accordance with their terms, subject
to bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and
similar laws of general applicability relating to or affecting creditors' rights
and to general equity principles.

If such form or terms have been so established, the Trustee shall not be
required to authenticate such Securities if the issue of such Securities
pursuant to this Indenture will affect the Trustee's own rights, duties or
immunities under the Securities and this Indenture or otherwise in a manner
which is not reasonably acceptable to the Trustee.

          Notwithstanding the provisions of Section 3.1 and of the immediately
preceding paragraph, if all Securities of a series are not to be originally
issued at one time, it shall not be necessary to deliver the Officers'
Certificate otherwise required pursuant to Section 3.1 or the Company Order and
Opinion of Counsel otherwise required pursuant to such preceding paragraph at or
prior to the time of authentication of each Security of such series if such

                                      24
<PAGE>
 
documents are delivered at or prior to the authentication upon original issuance
of the first Security of such series to be issued.

          Unless otherwise provided for in the form of Security, each Security
shall be dated the date of its authentication.

          No Security shall be entitled to any benefit under this Indenture or
be valid or obligatory for any purpose unless there appears on such Security a
certificate of authentication substantially in the form provided for herein
executed by the Trustee by manual signature, and such certificate upon any
Security shall be conclusive evidence, and the only evidence, that such Security
has been duly authenticated and delivered hereunder.  Notwithstanding the
foregoing, if any Security shall have been authenticated and delivered hereunder
but never issued and sold by the Company, and the Company shall deliver such
Security to the Trustee for cancellation as provided in Section 3.9, for all
purposes of this Indenture such Security shall be deemed never to have been
authenticated and delivered hereunder and shall never be entitled to the
benefits of this Indenture.

Section 3.4  Temporary Securities.

          Pending the preparation of definitive Securities of any series, the
Company may execute, and upon Company Order the Trustee shall authenticate and
deliver, temporary Securities which are printed, lithographed, typewritten,
mimeographed or otherwise produced, in any authorized denomination,
substantially of the tenor of the definitive Securities in lieu of which they
are issued and with such appropriate insertions, omissions, substitutions and
other variations as the officers executing such Securities may determine, as
evidenced by their execution of such Securities.

          If temporary Securities of any series are issued, the Company will
cause definitive Securities of that series to be prepared without unreasonable
delay.  After the preparation of definitive Securities of such series, the
temporary Securities of such series shall be exchangeable for definitive
Securities of such series upon surrender of the temporary Securities of such
series at the office or agency of the Company in a Place of Payment for that
series, without charge to the Holder.  Upon surrender for cancellation of any
one or more temporary Securities of any series the Company shall execute and the
Trustee shall authenticate and deliver in exchange therefor one or more
definitive Securities of the same series, of any authorized denominations and of
the same Stated Maturity and aggregate principal amount and of like tenor.
Until so exchanged the temporary Securities of any series shall in all respects
be entitled to the same benefits under this Indenture as definitive Securities
of such series and tenor.

Section 3.5  Registration, Registration of Transfer and Exchange.

          The Company shall cause to be kept at the Corporate Trust Office of
the Trustee a register (the register maintained in such office and in any other
office or agency of the Company in a Place of Payment being herein sometimes
collectively referred to as the "Security

                                      25
<PAGE>
 
Register") in which, subject to such reasonable regulations as it may prescribe,
the Company shall provide for the registration of Securities and of transfers of
Securities.  The Trustee is hereby appointed "Security Registrar" for the
purpose of registering Securities and transfers of Securities as herein
provided.

          Upon surrender for registration of transfer of any Security of any
series at the office or agency in a Place of Payment for that series as
designated pursuant to Section 10.2, the Company shall execute, and the Trustee
shall authenticate and deliver, in the name of the designated transferee or
transferees, one or more new Securities of the same series, of any authorized
denominations and of the same Stated Maturity and aggregate principal amount and
of like tenor.

          At the option of the Holder, Securities of any series may be exchanged
for other Securities of the same series, of any authorized denominations and of
the same Stated Maturity and aggregate principal amount and of like tenor, upon
surrender of the Securities to be exchanged at such office or agency.  Whenever
any Securities are so surrendered for exchange, the Company shall execute, and
the Trustee shall authenticate and deliver, the Securities which the Holder
making the exchange is entitled to receive.

          All Securities issued upon any registration of transfer or exchange of
Securities shall be the valid obligations of the Company, evidencing the same
debt, and entitled to the same benefits under this Indenture, as the Securities
surrendered upon such registration of transfer or exchange.

          Every Security presented or surrendered for registration of transfer
or for exchange shall (if so required by the Company or the Trustee) be duly
endorsed, or be accompanied by a written instrument of transfer in form
satisfactory to the Company and the Security Registrar duly executed, by the
Holder thereof or his attorney duly authorized in writing.

          No service charge shall be made for any registration of transfer or
exchange of Securities, but the Company may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
with any registration of transfer or exchange of Securities, other than
exchanges pursuant to Section 3.4, 9.6 or 11.7 not involving any transfer.

          The Company shall not be required (i) to issue, register the transfer
of or exchange Securities of any series during a period beginning at the opening
of business 15 days before the day of the mailing of a notice of redemption of
Securities of that series selected for redemption under Section 11.3 and ending
at the close of business on the day of such mailing, or (ii) to register the
transfer of or exchange any Security so selected for redemption in whole or in
part, except the unredeemed portion of any Security being redeemed in part.

                                      26
<PAGE>
 
          Notwithstanding the foregoing, any Book-Entry Security shall be
exchangeable pursuant to this Section 3.5 for Securities registered in the name
of Persons other than the Depository for such Security or its nominee only if
(i) such Depository notifies the Company that it is unwilling or unable to
continue as Depository for such Book-Entry Security or if at any time such
Depository ceases to be a clearing agency registered under the Securities
Exchange Act of 1934, as amended, (ii) the Company executes and delivers to the
Trustee a Company Order that such Book-Entry Security shall be so exchangeable
or (iii) there shall have occurred and be continuing an Event of Default with
respect to the Securities.  Any Book-Entry Security that is exchangeable
pursuant to the preceding sentence shall be exchangeable for Securities
registered in such names as such Depository shall direct.

          Notwithstanding any other provision in this Indenture, a Book-Entry
Security may not be transferred except as a whole by the Depository with respect
to such Book-Entry Security to a nominee of such Depository or by a nominee of
such Depository to such Depository or another nominee of such Depository.

Section 3.6  Mutilated, Destroyed, Lost and Stolen Securities.

          If any mutilated Security is surrendered to the Trustee, the Company
shall execute and the Trustee shall authenticate and deliver in exchange
therefor a new Security of the same series and of like tenor and principal
amount and bearing a number not contemporaneously outstanding.

          If there shall be delivered to the Company and the Trustee (i)
evidence to their satisfaction of the destruction, loss or theft of any Security
and (ii) such security or indemnity as may be required by them to save each of
them and any agent of either of them harmless, then, in the absence of notice to
the Company or the Trustee that such Security has been acquired by a bona fide
purchaser, the Company shall execute and the Trustee shall authenticate and
deliver, in lieu of any such destroyed, lost or stolen Security, a new Security
of the same series and the same Stated Maturity and aggregate principal amount
and of like tenor and bearing a number not contemporaneously outstanding.

          In case any such mutilated, destroyed, lost or stolen Security has
become or is about to become due and payable, the Company in its discretion may,
instead of issuing a new Security, pay such Security.

          Upon the issuance of any new Security under this Section, the Company
may require the payment by the holder of such mutilated, destroyed, lost or
stolen Security of a sum sufficient to cover any tax or other governmental
charge that may be imposed in relation thereto and any other expenses (including
the fees and expenses of the Trustee) connected therewith.

          Every new Security of any series issued pursuant to this Section in
lieu of any destroyed, lost or stolen Security shall constitute an original
additional contractual obligation of the Company, whether or not the destroyed,
lost or stolen Security shall be at any time

                                      27
<PAGE>
 
enforceable by anyone, and shall be entitled to all the benefits of this
Indenture equally and proportionately with any and all other Securities of that
series duly issued hereunder.

          The provisions of this Section are exclusive and shall preclude (to
the extent lawful) all other rights and remedies with respect to the replacement
or payment of mutilated, destroyed, lost or stolen Securities.

Section 3.7  Payment of Interest; Interest Rights Preserved.

          Except as otherwise provided as contemplated by Section 3.1 with
respect to any series of Securities, interest on any Security which is payable,
and is punctually paid or duly provided for, on any Interest Payment Date shall
be paid to the Person in whose name that Security (or one or more Predecessor
Securities) is registered at the close of business on the Regular Record Date
for such interest.

          Any interest on any Security of any series which is payable, but is
not punctually paid or duly provided for, on any Interest Payment Date (herein
called "Defaulted Interest") shall forthwith cease to be payable to the Holder
on the relevant Regular Record Date by virtue of having been such Holder, and
such Defaulted Interest may be paid by the Company, at its election in each
case, as provided in Clause (1) or (2) below:

          (1)  The Company may elect to make payment of any Defaulted Interest
     to the Persons in whose names the Securities of such series (or their
     respective Predecessor Securities) are registered at the close of business
     on a Special Record Date for the payment of such Defaulted Interest, which
     shall be fixed in the following manner.  The Company shall notify the
     Trustee in writing of the amount of Defaulted Interest proposed to be paid
     on each Security of such series and the date of the proposed payment, and
     at the same time the Company shall deposit with the Trustee an amount of
     money equal to the aggregate amount proposed to be paid in respect of such
     Defaulted Interest or shall make arrangements satisfactory to the Trustee
     for such deposit prior to the date of the proposed payment, such money when
     deposited to be held in trust for the benefit of the Persons entitled to
     such Defaulted Interest as in this Clause provided.  Thereupon the Trustee
     shall fix a Special Record Date for the payment of such Defaulted Interest
     which shall be not more than 15 days and not less than 10 days prior to the
     date of the proposed payment and not less than 10 days after the receipt by
     the Trustee of the notice of the proposed payment.  The Trustee shall
     promptly notify the Company of such Special Record Date and, in the name
     and at the expense of the Company, shall cause notice of the proposed
     payment of such Defaulted Interest and the Special Record Date therefor to
     be mailed, first-class postage prepaid, to each Holder of Securities of
     such series at his address as it appears in the Security Register, not less
     than 10 days prior to such Special Record Date.  Notice of the proposed
     payment of such Defaulted Interest and the Special Record Date therefor
     having been so mailed, such Defaulted Interest shall be paid to the Persons
     in whose names the Securities of such series (or their respective

                                      28
<PAGE>
 
     Predecessor Securities) are registered at the close of business on such
     Special Record Date and shall no longer be payable pursuant to the
     following Clause (2).

          (2)  The Company may make payment of any Defaulted Interest on the
     Securities of any series in any other lawful manner not inconsistent with
     the requirements of any securities exchange on which such Securities may be
     listed, and upon such notice as may be required by such exchange, if, after
     notice given by the Company to the Trustee of the proposed payment pursuant
     to this Clause, such manner of payment shall be deemed practicable by the
     Trustee.

          Subject to the foregoing provisions of this Section, each Security
delivered under this Indenture upon registration of transfer of or in exchange
for or in lieu of any other Security shall carry the rights to interest accrued
and unpaid, and to accrue, which were carried by such other Security.

Section 3.8  Persons Deemed Owners.

          Prior to due presentment of a Security for registration of transfer,
the Company, the Trustee and any agent of the Company or the Trustee may treat
the Person in whose name such Security is registered as the owner of such
Security for the purpose of receiving payment of principal of and any premium
and (subject to Section 3.7) any interest on such Security and for all other
purposes whatsoever, whether or not such Security be overdue, and neither the
Company, the Trustee nor any agent of the Company or the Trustee shall be
affected by notice to the contrary.

Section 3.9  Cancellation.

          All Securities surrendered for payment, redemption, registration of
transfer or exchange or for credit against any sinking fund payment shall, if
surrendered to any Person other than the Trustee, be delivered to the Trustee
and shall be promptly canceled by it.  The Company may at any time deliver to
the Trustee for cancellation any Securities previously authenticated and
delivered hereunder which the Company may have acquired in any manner
whatsoever, and may deliver to the Trustee (or to any other Person for delivery
to the Trustee) for cancellation any Securities previously authenticated
hereunder which the Company has not issued and sold, and all Securities so
delivered shall be promptly canceled by the Trustee.  No Securities shall be
authenticated in lieu of or in exchange for any Securities canceled as provided
in this Section, except as expressly permitted by this Indenture.  All canceled
Securities held by the Trustee shall be destroyed by the Trustee and the Trustee
shall deliver a certification of destruction to the Company upon request.

                                      29
<PAGE>
 
Section 3.10  Computation of Interest.

          Except as otherwise specified as contemplated by Section 3.1 for
Securities of any series, interest on the Securities of each series shall be
computed on the basis of a 360-day year of twelve 30-day months.

Section 3.11  CUSIP Numbers.

          The Company in issuing the Securities may use "CUSIP" numbers (if then
generally in use), and, if so, the Trustee shall use "CUSIP" numbers in notices
of redemption as a convenience to Holders; provided, however, that any such
notice may state that no representation is made as to the correctness of such
numbers either as printed on the Securities or as contained in any notice of a
redemption and that reliance may be placed only on the other identification
numbers printed on the Securities, and any such redemption shall not be affected
by any defect in or omission of such numbers.

                                  ARTICLE IV

                          Satisfaction and Discharge

Section 4.1  Satisfaction and Discharge of Indenture.

          This Indenture shall upon Company Request cease to be of further
effect (except as to any surviving rights of registration of transfer or
exchange of Securities herein expressly provided for), and the Trustee, at the
expense of the Company, shall execute proper instruments acknowledging
satisfaction and discharge of this Indenture, when

          (1)  either

          (A)  all Securities theretofore authenticated and delivered (other
     than (i) Securities which have been destroyed, lost or stolen and which
     have been replaced or paid as provided in Section 3.6 and (ii) Securities
     for whose payment money has theretofore been deposited in trust or
     segregated and held in trust by the Company and thereafter repaid to the
     Company or discharged from such trust, as provided in Section 10.3) have
     been delivered to the Trustee for cancellation; or

          (B)  all such Securities not theretofore delivered to the Trustee for
     cancellation

               (i)  have become due and payable, or

               (ii) will become due and payable at their Stated Maturity within
          one year, or

                                      30
<PAGE>
 
               (iii)  are to be called for redemption within one year under
          arrangements satisfactory to the Trustee for the giving of notice of
          redemption by the Trustee in the name, and at the expense, of the
          Company,

     and the Company, in the case of (i), (ii) or (iii) above, has deposited or
     caused to be deposited with the Trustee as trust funds in trust for the
     purpose an amount sufficient to pay and discharge the entire indebtedness
     on such Securities not theretofore delivered to the Trustee for
     cancellation, for principal and any premium and interest to the date of
     such deposit (in the case of Securities which have become due and payable)
     or to the Stated Maturity or Redemption Date, as the case may be;

          (2)  the Company has paid or caused to be paid all other sums payable
     hereunder by the Company; and

          (3)  the Company has delivered to the Trustee an Officers' Certificate
     and an Opinion of Counsel, each stating that all conditions precedent
     herein provided for relating to the satisfaction and discharge of this
     Indenture have been complied with.

          Notwithstanding the satisfaction and discharge of this Indenture, the
obligations of the Company to the Trustee under Section 6.7, the respective
obligations of the Company and the Trustee to any Authenticating Agent under
Section 6.14 and, if money shall have been deposited with the Trustee pursuant
to subclause (B) of clause (1) of this Section, the obligations of the Trustee
under Section 4.2 and the last paragraph of Section 10.3 shall survive.

Section 4.2  Application of Trust Money.

          Subject to provisions of the last paragraph of Section 10.3, all money
deposited with the Trustee pursuant to Section 4.1 shall be held in trust and
applied by it, in accordance with the provisions of the Securities and this
Indenture, to the payment, either directly or through any Paying Agent
(including the Company acting as its own Paying Agent) as the Trustee may
determine, to the Persons entitled thereto, of the principal and any premium and
interest for whose payment such money has been deposited with the Trustee.


                                   ARTICLE V

                                    Remedies

Section 5.1  Events of Default.

          "Event of Default," wherever used herein with respect to Securities of
any series, means any one of the following events (whatever the reason for such
Event of Default and whether it shall be voluntary or involuntary or be effected
by operation of law or pursuant to

                                       31
<PAGE>
 
any judgment, decree or order of any court or any order, rule or regulation of
any administrative or governmental body):

          (1)  default in the payment of any interest upon any Security of that
     series when it becomes due and payable, and continuance of such default for
     a period of 30 days; or

          (2)  default in the payment of the principal of (or premium, if any,
     on) any Security of that series at its Maturity; or

          (3)  default in the deposit of any sinking fund or other payment
     required pursuant to the terms of a Security of that Series as established
     by or pursuant to a Board Resolution as permitted by Section 3.1(8), when
     and as due by the terms of a Security of that series; or

          (4)  default in the performance, or breach, of any covenant or
     warranty of the Company in this Indenture (other than a covenant or
     warranty a default in whose performance or whose breach is elsewhere in
     this Section specifically dealt with or which has expressly been included
     in this Indenture solely for the benefit of series of Securities other than
     that series, provided that for purposes of this clause (4) any covenant or
     agreement on the part of the Company contained in this Indenture which is
     not limited to a series of Securities shall be in respect of all series of
     Securities), and continuance of such default or breach for a period of 90
     days after there has been given, by registered or certified mail, to the
     Company by the Trustee or to the Company and the Trustee by the Holder or
     Holders of at least 25% in principal amount of the Outstanding Securities
     of that series a written notice specifying such default or breach and
     requiring it to be remedied and stating that such notice is a "Notice of
     Default" hereunder; or

          (5)  the entry by a court having jurisdiction in the premises of (A) a
     decree or order for relief in respect of the Company in an involuntary case
     or proceeding under any applicable Federal or State bankruptcy, insolvency,
     reorganization or other similar law or (B) a decree or order adjudging the
     Company a bankrupt or insolvent, or approving as properly filed a petition
     seeking reorganization, arrangement, adjustment or composition of or in
     respect of the Company under any applicable Federal or State law, or
     appointing a custodian, receiver, liquidator, assignee, trustee,
     sequestrator or other similar official of the Company or of any substantial
     part of its property, or ordering the winding up or liquidation of its
     affairs, and the continuance of any such decree or order for relief or any
     such other decree or order unstayed and in effect for a period of 60
     consecutive days; or

          (6)  the commencement by the Company of a voluntary case or proceeding
     under any applicable Federal or State bankruptcy, insolvency,
     reorganization or other similar law or of any other case or proceeding to
     be adjudicated a bankrupt or insolvent, or the consent by it to the entry
     of a decree or order for relief in respect of the Company in an involuntary
     case or proceeding under any applicable Federal or State bankruptcy,

                                       32
<PAGE>
 
     insolvency, reorganization or other similar law or to the commencement of
     any bankruptcy or insolvency case or proceeding against it, or the filing
     by it of a petition or answer or consent seeking reorganization or relief
     under any applicable Federal or State law, or the consent by it to the
     filing of such petition or to the appointment of or taking possession by a
     custodian, receiver, liquidator, assignee, trustee, sequestrator or other
     similar official of the Company or of any substantial part of its property,
     or the making by it of an assignment for the benefit of creditors, or the
     admission by it in writing of its inability to pay its debts generally as
     they become due, or the taking of corporate action by the Company in
     furtherance of any such action; or

          (7) any event which constitutes an "Event of Default" under the terms
     governing Securities of that series established as provided in Section 3.1.

Section 5.2  Acceleration of Maturity; Rescission and Annulment.

          If an Event of Default with respect to Securities of any series at the
time Outstanding occurs and is continuing, then in every such case the Trustee
or the Holder or Holders of not less than 25% in principal amount of the
Outstanding Securities of that series may declare the principal amount (or, if
the Securities of that series are Original Issue Discount Securities, such
portion of the principal amount as may be specified in the terms thereof) of all
of the Securities of that series to be due and payable immediately, by a notice
in writing to the Company (and to the Trustee if given by Holders), and upon any
such declaration such principal amount (or specified amount) shall become
immediately due and payable.

          At any time after such a declaration of acceleration with respect to
Securities of any series has been made and before a judgment or decree for
payment of the money due has been obtained by the Trustee as hereinafter in this
Article provided, the Holders of a majority in principal amount of the
Outstanding Securities of that series, by written notice to the Company and the
Trustee, may rescind and annul such declaration and its consequences if

          (1)  the Company has paid or deposited with the Trustee a sum
     sufficient to pay

               (A)  all overdue interest on all Securities of that series,

               (B)  the principal of (and premium, if any, on) any Securities of
          that series which have become due otherwise than by such declaration
          of acceleration and any interest thereon at the rate or rates
          prescribed therefor in such Securities,

               (C)  to the extent that payment of such interest is lawful,
          interest upon overdue interest at the rate or rates prescribed
          therefor in such Securities, and

               (D)  all sums paid or advanced by the Trustee hereunder and the
          reasonable compensation, expenses, disbursements and advances of the
          Trustee, its agents and counsel;

                                       33
<PAGE>
 
     and

          (2)  all Events of Default with respect to Securities of that series,
     other than the non-payment of the principal of Securities of that series
     which have become due solely by such declaration of acceleration, have been
     cured or waived as provided in Section 5.13.

No such rescission shall affect any subsequent default or impair any right
consequent thereon.

Section 5.3  Collection of Indebtedness and Suits for Enforcement by Trustee.

          The Company covenants that if

          (1)  default is made in the payment of any interest on any Security of
     any series when such interest becomes due and payable and such default
     continues for a period of 30 days, or

          (2)  default is made in the payment of the principal of (or premium,
     if any, on) any Security of any series at the Maturity thereof,

the Company will, upon demand of the Trustee, pay to it, for the benefit of the
Holders of such Securities, the whole amount then due and payable on Securities
of such series for principal and any premium and interest and, to the extent
that payment of such interest shall be legally enforceable, interest on any
overdue principal and premium and on any overdue interest, at the rate or rates
prescribed therefor in such Securities, and, in addition thereto, such further
amount as shall be sufficient to cover the costs and expenses of collection,
including the reasonable compensation, expenses, disbursements and advances of
the Trustee, its agents and counsel.

          If an Event of Default with respect to Securities of any series occurs
and is continuing, the Trustee may in its discretion proceed to protect and
enforce its rights and the rights of the Holders of Securities of such series by
such appropriate judicial proceedings as the Trustee shall deem most effectual
to protect and enforce any such rights, whether for the specific enforcement of
any covenant or agreement in this Indenture or in aid of the exercise of any
power granted herein, or to enforce any other proper remedy.

Section 5.4  Trustee May File Proofs of Claim.

          In case of any judicial proceeding relative to the Company (or any
other obligor upon the Securities), its property or its creditors, the Trustee
shall be entitled and empowered, by intervention in such proceeding or
otherwise, to take any and all actions authorized under the Trust Indenture Act
in order to have claims of the Holders and the Trustee allowed in any such
proceeding.  In particular, the Trustee shall be authorized to collect and
receive any moneys or other property payable or deliverable on any such claims
and to distribute the same; and any custodian, receiver, assignee, trustee,
liquidator, sequestrator or other similar official in any

                                       34
<PAGE>
 
such judicial proceeding is hereby authorized by each Holder to make such
payments to the Trustee and, in the event that the Trustee shall consent to the
making of such payments directly to the Holders, to pay to the Trustee any
amount due it for the reasonable compensation, expenses, disbursements and
advances of the Trustee, its agents and counsel, and any other amounts due the
Trustee under Section 6.7.

          No provision of this Indenture shall be deemed to authorize the
Trustee to authorize or consent to or accept or adopt on behalf of any Holder
any plan of reorganization, arrangement, adjustment or composition affecting the
Securities or the rights of any Holder thereof or to authorize the Trustee to
vote in respect of the claim of any Holder in any such proceeding.

Section 5.5  Trustee May Enforce Claims Without Possession of Securities.

          All rights of action and claims under this Indenture or the Securities
may be prosecuted and enforced by the Trustee without the possession of any of
the Securities or the production thereof in any proceeding relating thereto, and
any such proceeding instituted by the Trustee shall be brought in its own name
as trustee of an express trust, and any recovery of judgment shall, after
provision for the payment of the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel, be for the
ratable benefit of the Holders of the Securities in respect of which such
judgment has been recovered.

Section 5.6  Application of Money Collected.

          Any money collected by the Trustee pursuant to this Article shall be
applied in the following order, at the date or dates fixed by the Trustee and,
in case of the distribution of such money on account of principal or any premium
or interest, upon presentation of the Securities and the notation thereon of the
payment if only partially paid and upon surrender thereof if fully paid:

          FIRST:  To the payment of all amounts due the Trustee under Section
     6.7;

          SECOND:  To the payment of the amounts then due and unpaid for
     principal of and any premium and interest on the Securities in respect of
     which or for the benefit of which such money has been collected, ratably,
     without preference or priority of any kind, according to the amounts due
     and payable on such Securities for principal and any premium and interest,
     respectively; and

          THIRD:  To the Company.

Section 5.7  Limitation on Suits.

          No Holder of any Security of any series shall have any right to
institute any proceeding, judicial or otherwise, with respect to this Indenture,
or for the appointment of a

                                       35
<PAGE>
 
receiver or trustee, or for any other remedy hereunder, unless

          (1) such Holder has previously given written notice to the Trustee of
     a continuing Event of Default with respect to the Securities of that
     series;

          (2) the Holders of not less than 25% in principal amount of the
     Outstanding Securities of that series shall have made written request to
     the Trustee to institute proceedings in respect of such Event of Default in
     its own name as Trustee hereunder;

          (3) such Holder or Holders have offered to the Trustee reasonable
     indemnity against the costs, expenses and liabilities to be incurred in
     compliance with such request;

          (4) the Trustee for 60 days after its receipt of such notice, request
     and offer of indemnity has failed to institute any such proceeding; and

          (5) no direction inconsistent with such written request has been given
     to the Trustee during such 60-day period by the Holders of a majority in
     principal amount of the Outstanding Securities of that series;

it being understood and intended that no one or more of such Holders shall have
any right in any manner whatever by virtue of, or by availing of, any provision
of this Indenture to affect, disturb or prejudice the rights of any other of
such Holders, or to obtain or to seek to obtain priority or preference over any
other of such Holders or to enforce any right under this Indenture, except in
the manner herein provided and for the equal and ratable benefit of all of such
Holders.

Section 5.8  Unconditional Right of Holders to Receive Principal, Premium and
             ----------------------------------------------------------------
             Interest.
             -------- 

          Notwithstanding any other provision in this Indenture, the Holder of
any Security shall have the right, which is absolute and unconditional, to
receive payment of the principal of and any premium and (subject to Section 3.7)
any interest on such Security on the Stated Maturity or Maturities expressed in
such Security (or, in the case of redemption, on the Redemption Date) and to
institute suit for the enforcement of any such payment, and such rights shall
not be impaired without the consent of such Holder.

Section 5.9  Restoration of Rights and Remedies.
             ---------------------------------- 

          If the Trustee or any Holder has instituted any proceeding to enforce
any right or remedy under this Indenture and such proceeding has been
discontinued or abandoned for any reason, or has been determined adversely to
the Trustee or to such Holder, then and in every such case, subject to any
determination in such proceeding, the Company, the Trustee and the Holders shall
be restored severally and respectively to their former positions hereunder and
thereafter all rights and remedies of the Trustee and the Holders shall continue
as though no such proceeding had been instituted.

                                       36
<PAGE>
 
Section 5.10  Rights and Remedies Cumulative.
              ------------------------------ 

          Except as otherwise provided with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Securities in the last paragraph
of Section 3.6, no right or remedy herein conferred upon or reserved to the
Trustee or to the Holders is intended to be exclusive of any other right or
remedy, and every right and remedy shall, to the extent permitted by law, be
cumulative and in addition to every other right and remedy given hereunder or
now or hereafter existing at law or in equity or otherwise. The assertion or
employment of any right or remedy hereunder, or otherwise, shall not prevent the
concurrent assertion or employment of any other appropriate right or remedy.

Section 5.11  Delay or Omission Not Waiver.
              ---------------------------- 

          No delay or omission of the Trustee or of any Holder of any Securities
to exercise any right or remedy accruing upon any Event of Default shall impair
any such right or remedy or constitute a waiver of any such Event of Default or
an acquiescence therein. Every right and remedy given by this Article or by law
to the Trustee or to the Holders may be exercised from time to time, and as
often as may be deemed expedient, by the Trustee or by the Holders, as the case
may be.

Section 5.12  Control by Holders.
              ------------------ 

          The Holders of a majority in principal amount of the Outstanding
Securities of any series shall have the right to direct the time, method and
place of conducting any proceeding for any remedy available to the Trustee, or
exercising any trust or power conferred on the Trustee, with respect to the
Securities of such series, provided that

          (1) such direction shall not be in conflict with any rule of law or
     with this Indenture, and

          (2) the Trustee may take any other action deemed proper by the Trustee
     which is not inconsistent with such direction.

Section 5.13  Waiver of Past Defaults.
              ----------------------- 

          The Holders of not less than a majority in principal amount of the
Outstanding Securities of any series may on behalf of the Holders of all the
Securities of such series waive any past default hereunder with respect to such
series and its consequences, except a default

          (1) in the payment of the principal of or any premium or interest on
     any Security of such series, or

                                       37
<PAGE>
 
          (2) in respect of a covenant or provision hereof which under Article
     IX cannot be modified or amended without the consent of the Holder of each
     Outstanding Security of such series affected.

          Upon any such waiver, such default shall cease to exist, and any Event
of Default arising therefrom shall be deemed to have been cured, for every
purpose of this Indenture; but no such waiver shall extend to any subsequent or
other default or impair any right consequent thereon.

Section 5.14  Undertaking for Costs.
              --------------------- 

          In any suit for the enforcement of any right or remedy under this
Indenture, or in any suit against the Trustee for any action taken, suffered or
omitted by it as Trustee, a court may require any party litigant in such suit to
file an undertaking to pay the costs of such suit, and may assess costs against
any such party litigant, in the manner and to the extent provided in the Trust
Indenture Act; provided that neither this Section nor the Trust Indenture Act
shall be deemed to authorize any court to require such an undertaking or to make
such an assessment in any suit instituted by the Company or the Trustee.

Section 5.15  Waiver of Stay or Extension Laws.
              -------------------------------- 

          The Company covenants (to the extent that it may lawfully do so) that
it will not at any time insist upon, or plead, or in any manner whatsoever claim
or take the benefit or advantage of, any stay or extension law wherever enacted,
now or at any time hereafter in force, which may affect the covenants or the
performance of this Indenture; and the Company (to the extent that it may
lawfully do so) hereby expressly waives all benefit or advantage of any such law
and covenants that it will not hinder, delay or impede the execution of any
power herein granted to the Trustee, but will suffer and permit the execution of
every such power as though no such law had been enacted.

                                  ARTICLE VI

                                  The Trustee

Section 6.1  Certain Duties and Responsibilities.
             ----------------------------------- 

          The duties and responsibilities of the Trustee shall be as provided by
the Trust Indenture Act. Notwithstanding the foregoing, no provision of this
Indenture shall require the Trustee to expend or risk its own funds or otherwise
incur any financial liability in the performance of any of its duties hereunder,
or in the exercise of any of its rights or powers, if it shall have reasonable
grounds for believing that repayment of such funds or adequate indemnity against
such risk or liability is not reasonably assured to it. Whether or not therein
expressly so provided, every provision of this Indenture relating to the conduct
or affecting the

                                       38
<PAGE>
 
liability of or affording protection to the Trustee shall be subject to the
provisions of this Section.

Section 6.2  Notice of Defaults.
             ------------------ 

          If a default occurs hereunder with respect to Securities of any
series, the Trustee shall give the Holders of Securities of such series notice
of such default as and to the extent provided by the Trust Indenture Act;
provided, however, that in the case of any default of the character specified in
Section 5.1(4) with respect to Securities of such series, no such notice to
Holders shall be given until at least 30 days after the occurrence thereof. For
the purpose of this Section, the term "default" means any event which is, or
after notice or lapse of time or both would become, an Event of Default with
respect to Securities of such series.

Section 6.3  Certain Rights of Trustee.
             ------------------------- 

          Subject to the provisions of Section 6.1:

          (a) the Trustee may rely and shall be protected in acting or
refraining from acting upon any resolution, certificate, statement, instrument,
opinion, report, notice, request, direction, consent, order, bond, debenture,
note, other evidence of indebtedness or other paper or document believed by it
to be genuine and to have been signed or presented by the proper party or
parties;

          (b) any request or direction of the Company mentioned herein shall be
sufficiently evidenced by a Company Request or Company Order, and any resolution
of the Board of Directors may be sufficiently evidenced by a Board Resolution;

          (c) whenever in the administration of this Indenture the Trustee shall
deem it desirable that a matter be proved or established prior to taking,
suffering or omitting any action hereunder, the Trustee (unless other evidence
be herein specifically prescribed) may, in the absence of bad faith on its part,
rely upon an Officers' Certificate;

          (d) the Trustee may consult with counsel and the written advice of
such counsel or any Opinion of Counsel shall be full and complete authorization
and protection in respect of any action taken, suffered or omitted by it
hereunder in good faith and in reliance thereon;

          (e) the Trustee shall be under no obligation to exercise any of the
rights or powers vested in it by this Indenture at the request or direction of
any of the Holders pursuant to this Indenture, unless such Holders shall have
offered to the Trustee reasonable security or indemnity against the costs,
expenses and liabilities which might be incurred by it in compliance with such
request or direction;

          (f) the Trustee shall not be bound to make any investigation into the
facts or matters stated in any resolution, certificate, statement, instrument,
opinion, report, notice,

                                       39
<PAGE>
 
request, direction, consent, order, bond, debenture, note, other evidence of
indebtedness or other paper or document, but the Trustee, in its discretion, may
make such further inquiry or investigation into such facts or matters as it may
see fit, and, if the Trustee shall determine to make such further inquiry or
investigation, it shall be entitled to examine the books, records and premises
of the Company, personally or by agent or attorney; and

          (g) the Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or
attorneys.

Section 6.4  Not Responsible for Recitals or Issuance of Securities.
             ------------------------------------------------------ 

          The recitals contained herein and in the Securities, except the
Trustee's certificates of authentication, shall be taken as the statements of
the Company, and the Trustee or any Authenticating Agent assumes no
responsibility for their correctness. The Trustee makes no representations as to
the validity or sufficiency of this Indenture or of the Securities. The Trustee
or any Authenticating Agent shall not be accountable for the use or application
by the Company of Securities or the proceeds thereof. The Trustee shall not be
responsible for any statement made in any prospectus or similar document used to
sell the Securities.

Section 6.5  May Hold Securities.
             ------------------- 

          The Trustee, any Authenticating Agent, any Paying Agent, any Security
Registrar or any other agent of the Company, in its individual or any other
capacity, may become the owner or pledgee of Securities and, subject to Sections
6.8 and 6.13, may otherwise deal with the Company with the same rights it would
have if it were not Trustee, Authenticating Agent, Paying Agent, Security
Registrar or such other agent.

Section 6.6  Money Held in Trust.
             ------------------- 

          Money held by the Trustee in trust hereunder need not be segregated
from other funds except to the extent required by law. The Trustee shall invest
money received by it hereunder as agreed with the Company.

Section 6.7  Compensation and Reimbursement.
             ------------------------------ 

          The Company agrees

          (1) to pay to the Trustee from time to time such compensation as shall
     be agreed to in writing between the Company and the Trustee for all
     services rendered by it hereunder (which compensation shall not be limited
     by any provision of law in regard to the compensation of a trustee of an
     express trust);

          (2) except as otherwise expressly provided herein, to reimburse the
     Trustee upon its request for all reasonable expenses, disbursements and
     advances incurred or made by

                                       40
<PAGE>
 
     the Trustee in accordance with any provision of this Indenture (including
     the reasonable compensation and the expenses and disbursements of its
     agents and counsel), except any such expense, disbursement or advance as
     may be attributable to its negligence or bad faith; and

          (3) to indemnify the Trustee for, and to hold it harmless against,
     loss, liability or expense, incurred without negligence or bad faith on its
     part, arising out of or in connection with the acceptance or administration
     of the trust or trusts hereunder, including the costs and expenses of
     defending itself against any claim or liability in connection with the
     exercise or performance of any of its powers or duties hereunder.

Section 6.8  Disqualification; Conflicting Interests.
             --------------------------------------- 

          If the Trustee has or shall acquire a conflicting interest within the
meaning of the Trust Indenture Act, the Trustee shall either eliminate such
interest or resign, to the extent and in the manner provided by, and subject to
the provisions of, the Trust Indenture Act and this Indenture.

Section 6.9  Corporate Trustee Required; Eligibility.
             --------------------------------------- 

          There shall at all times be a Trustee hereunder which shall be a
Person that is eligible pursuant to the Trust Indenture Act to act as such and
has a combined capital and surplus of at least $500,000,000 and have an office
or agency in New York, New York where Securities may be presented for payment
and for registration of transfer or exchange. If such Person publishes reports
of condition at least annually, pursuant to law or to the requirements of said
supervising or examining authority, then for the purposes of this Section, the
combined capital and surplus of such Person shall be deemed to be its combined
capital and surplus as set forth in its most recent report of condition so
published. If at any time the Trustee shall cease to be eligible in accordance
with the provisions of this Section, it shall resign immediately in the manner
and with the effect hereinafter specified in this Article.

Section 6.10  Resignation and Removal; Appointment of Successor.
              ------------------------------------------------- 

          (a) No resignation or removal of the Trustee and no appointment of a
successor Trustee pursuant to this Article shall become effective until the
acceptance of appointment by the successor Trustee in accordance with the
applicable requirements of Section 6.11.

          (b) The Trustee may resign at any time with respect to the Securities
by giving written notice thereof to the Company. If the instrument of acceptance
by a successor Trustee required by Section 6.11 shall not have been delivered to
the Trustee within 30 days after the giving of such notice of resignation, the
resigning Trustee may petition any court of competent jurisdiction for the
appointment of a successor Trustee with respect to the Securities of such
series.

                                       41
<PAGE>
 
          (c) The Trustee may be removed at any time with respect to the
Securities by Act of the Holders of a majority in principal amount of the
Outstanding Securities delivered to the Trustee and to the Company.

          (d)  If at any time:

          (1) the Trustee shall fail to comply with Section 6.8 after written
     request therefor by the Company or by any Holder who has been a bona fide
     Holder of a Security for at least six months, or

          (2) the Trustee shall cease to be eligible under Section 6.9 and shall
     fail to resign after written request therefor by the Company or by any such
     Holder, or

          (3) the Trustee shall become incapable of acting or shall be adjudged
     a bankrupt or insolvent or a receiver of the Trustee or of its property
     shall be appointed or any public officer shall take charge or control of
     the Trustee or of its property or affairs for the purpose of
     rehabilitation, conservation or liquidation,

then, in any such case, (i) the Company by or pursuant to a Board Resolution may
remove the Trustee with respect to all securities, or (ii) subject to Section
5.14, any Holder who has been a bona fide Holder of a Security for at least six
months may, on behalf of himself and all others similarly situated, petition any
court of competent jurisdiction for the removal of the Trustee with respect to
all Securities and the appointment of a successor Trustee or Trustees.

          (e) If the Trustee shall resign, be removed or become incapable of
acting, or if a vacancy shall occur in the office of Trustee for any cause, with
respect to the Securities of one or more series, the Company, by or pursuant to
a Board Resolution, shall promptly appoint a successor Trustee or Trustees with
respect to the Securities of that or those series (it being understood that any
such successor Trustee may be appointed with respect to the Securities of one or
more or all of such series and that at any time there shall be only one Trustee
with respect to the Securities of any particular series) and shall comply with
the applicable requirements of Section 6.11. If, within one year after such
resignation, removal or incapability, or the occurrence of such vacancy, a
successor Trustee with respect to the Securities of any Series shall be
appointed by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series delivered to the Company and the retiring
Trustee, the successor Trustee so appointed shall, forthwith upon its acceptance
of such appointment in accordance with the applicable requirements of Section
6.11, become the successor Trustee with respect to the Securities of such series
and to that extent supersede the successor Trustee appointed by the Company. If
no successor Trustee with respect to the Securities of any Series shall have
been so appointed by the Company or the Holders and accepted appointment in the
manner required by Section 6.11, any Holder who has been a bona fide Holder of a
Security of such series for at least six months may, on behalf of himself and
all others similarly situated, petition any court of competent jurisdiction for
the appointment of a successor Trustee with respect to the Securities of such
series.

                                       42
<PAGE>
 
          (f) The Company shall give notice of each resignation and each removal
of the Trustee with respect to the Securities of any series and each appointment
of a successor Trustee with respect to the Securities of any series to all
Holders of Securities of such series in the manner provided in Section 1.6. Each
notice shall include the name of the successor Trustee with respect to the
Securities of such series and the address of its Corporate Trust Office.

Section 6.11  Acceptance of Appointment by Successor.
              -------------------------------------- 

          (a) In case of the appointment hereunder of a successor Trustee with
respect to all Securities, every such successor Trustee so appointed shall
execute, acknowledge and deliver to the Company and to the retiring Trustee an
instrument accepting such appointment, and thereupon the resignation or removal
of the retiring Trustee shall become effective and such successor Trustee,
without any further act, deed or conveyance, shall become vested with all the
rights, powers, trusts and duties of the retiring Trustee; but, on the request
of the Company or the successor Trustee, such retiring Trustee shall, upon
payment of its charges, execute and deliver an instrument transferring to such
successor Trustee all the rights, powers and trusts of the retiring Trustee and
shall duly assign, transfer and deliver to such successor Trustee all property
and money held by such retiring Trustee hereunder.

          (b) In case of the appointment hereunder of a successor Trustee with
respect to the Securities of one or more (but not all) series, the Company, the
retiring Trustee and each successor Trustee with respect to the Securities of
one or more series shall execute and deliver an indenture supplemental hereto
wherein each successor Trustee shall accept such appointment and which (1) shall
contain such provisions as shall be necessary or desirable to transfer and
confirm to, and to vest in, each successor Trustee all the rights, powers,
trusts and duties of the retiring Trustee with respect to the Securities of that
or those series to which the appointment of such successor Trustee relates, (2)
if the retiring Trustee is not retiring with respect to all Securities, shall
contain such provisions as shall be deemed necessary or desirable to confirm
that all the rights, powers, trusts and duties of the retiring Trustee with
respect to the Securities of that or those series as to which the retiring
Trustee is not retiring shall continue to be vested in the retiring Trustee, and
(3) shall add to or change any of the provisions of this Indenture as shall be
necessary to provide for or facilitate the administration of the trusts
hereunder by more than one Trustee, it being understood that nothing herein or
in such supplemental indenture shall constitute such Trustees co-trustees of the
same trust and that each such Trustee shall be trustee of a trust or trusts
hereunder separate and apart from any trust or trusts hereunder administered by
any other such Trustee; and upon the execution and delivery of such supplemental
indenture the resignation or removal of the retiring Trustee shall become
effective to the extent provided therein and each such successor Trustee,
without any further act, deed or conveyance, shall become vested with all the
rights, powers, trusts and duties of the retiring Trustee with respect to the
Securities of that or those series to which the appointment of such successor
Trustee relates; but, on request of the Company or any successor Trustee, such
retiring Trustee shall duly assign, transfer and deliver to such successor
Trustee all property and money held by such retiring Trustee hereunder with
respect to the Securities of that or those series to which the appointment of
such successor Trustee relates.

                                       43
<PAGE>
 
          (c) Upon request of any such successor Trustee, the Company shall
execute any and all instruments for more fully and certainly vesting in and
confirming to such successor Trustee all such rights, powers and trusts referred
to in paragraph (a) and (b) of this Section, as the case may be.

          (d) No successor Trustee shall accept its appointment unless at the
time of such acceptance such successor Trustee shall be qualified and eligible
under this Article.

Section 6.12  Merger, Conversion, Consolidation or Succession to Business.
              ----------------------------------------------------------- 

          Any corporation into which the Trustee may be merged or converted or
with which it may be consolidated, or any corporation resulting from any merger,
conversion or consolidation to which the Trustee shall be a party, or any
corporation succeeding to all or substantially all the corporate trust business
of the Trustee, shall be the successor of the Trustee hereunder, provided such
corporation shall be otherwise qualified and eligible under this Article,
without the execution or filing of any paper or any further act on the part of
any of the parties hereto. In case any Securities shall have been authenticated,
but not delivered, by the Trustee then in office, any successor by merger,
conversion or consolidation to such authenticating Trustee may adopt such
authentication and deliver the Securities so authenticated with the same effect
as if such successor Trustee had itself authenticated such Securities.

Section 6.13  Preferential Collection of Claims Against Company.
              ------------------------------------------------- 

          If and when the Trustee shall be or become a creditor of the Company
(or any other obligor upon the Securities), the Trustee shall be subject to the
provisions of the Trust Indenture Act regarding the collection of claims against
the Company (or any such other obligor).

Section 6.14  Appointment of Authenticating Agent.
              ----------------------------------- 

          The Trustee may appoint an Authenticating Agent or Agents with respect
to one or more series of Securities which shall be authorized to act on behalf
of the Trustee to authenticate Securities of such series issued upon original
issue and upon exchange, registration of transfer or partial redemption thereof
or pursuant to Section 3.6, and Securities so authenticated shall be entitled to
the benefits of this Indenture and shall be valid and obligatory for all
purposes as if authenticated by the Trustee hereunder. Wherever reference is
made in this Indenture to the authentication and delivery of Securities by the
Trustee or the Trustee's certificate of authentication, such reference shall be
deemed to include authentication and delivery on behalf of the Trustee by an
Authenticating Agent and a certificate of authentication executed on behalf of
the Trustee by an Authenticating Agent. Each Authenticating Agent shall be
acceptable to the Company and shall at all times be a corporation organized and
doing business under the laws of the United States of America, any State thereof
or the District of Columbia, authorized under such laws to act as Authenticating
Agent, having a combined capital and surplus of not less than $500,000,000 and
subject to supervision or examination by Federal

                                       44
<PAGE>
 
or State authority. If such Authenticating Agent publishes reports of condition
at least annually, pursuant to law or to the requirements of said supervising or
examining authority, then for the purposes of this Section, the combined capital
and surplus of such Authenticating Agent shall be deemed to be its combined
capital and surplus as set forth in its most recent report of condition so
published. If at any time an Authenticating Agent shall cease to be eligible in
accordance with the provisions of this Section, such Authenticating Agent shall
resign immediately in the manner and with the effect specified in this Section.

          Any corporation into which an Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which such Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency or
corporate trust business of an Authenticating Agent, shall continue to be an
Authenticating Agent, provided such corporation shall be otherwise eligible
under this Section, without the execution or filing of any paper or any further
act on the part of the Trustee or the Authenticating Agent.

          An Authenticating Agent may resign at any time by giving written
notice thereof to the Trustee and to the Company. The Trustee may at any time
terminate the agency of an Authenticating Agent by giving written notice thereof
to such Authenticating Agent and to the Company. Upon receiving such a notice of
resignation or upon such a termination, or in case at any time such
Authenticating Agent shall cease to be eligible in accordance with the
provisions of this Section, the Trustee may appoint a successor Authenticating
Agent which shall be acceptable to the Company and shall mail written notice of
such appointment by first-class mail, postage prepaid, to all Holders of
Securities of the series with respect to which such Authenticating Agent will
serve, as their names and addresses appear in the Security Register. Any
successor Authenticating Agent upon acceptance of its appointment hereunder
shall become vested with all the rights, powers and duties of its predecessor
hereunder, with like effect as if originally named as an Authenticating Agent.
No successor Authenticating Agent shall be appointed unless eligible under the
provisions of this Section.

          The Company agrees to pay to each Authenticating Agent from time to
time reasonable compensation for its services under this Section.

          If an appointment with respect to one or more series is made pursuant
to this Section, the Securities of such series may have endorsed thereon, in
addition to the Trustee's certificate of authentication, an alternative
certificate of authentication in the following form:

                                       45
<PAGE>
 
          This is one of the Securities of the series designated therein
referred to in the within-mentioned Indenture.


                                       _______________________________
                                                  As Trustee



                                       By:___________________________
                                            As Authenticating Agent



                                       By:__________________________
                                              Authorized Officer


                                       46
<PAGE>
 
                                  ARTICLE VII

               Holders' Lists and Reports by Trustee and Company

Section 7.1  Company to Furnish Trustee Names and Addresses of Holders.
             --------------------------------------------------------- 

          The Company will furnish or cause to be furnished to the Trustee:

          (a) semi-annually, not later than May 1 and November 1 in each year, a
list, in such form as the Trustee may reasonably require, of the names and
addresses of the Holders as of the preceding April 1 or October 1, as the case
may be; and

          (b) at such other times as the Trustee may request in writing, within
30 days after the receipt by the Company of any such request, a list of similar
form and content as of a date not more than 15 days prior to the time such list
is furnished;

excluding from any such list names and addresses received by the Trustee in its
capacity as Security Registrar.

Section 7.2  Preservation of Information; Communications to Holders.
             ------------------------------------------------------ 

          (a) The Trustee shall preserve, in as current a form as is reasonably
practicable, the names and addresses of Holders contained in the most recent
list furnished to the Trustee as provided in Section 7.1 and the names and
addresses of Holders received by the Trustee in its capacity as Security
Registrar. The Trustee may destroy any list furnished to it as provided in
Section 7.1 upon receipt of a new list so furnished.

          (b) The rights of the Holders to communicate with other Holders with
respect to their rights under this Indenture or under the Securities, and the
corresponding rights and privileges of the Trustee, shall be as provided by the
Trust Indenture Act.

          (c) Every Holder of Securities, by receiving and holding the same,
agrees with the Company and the Trustee that neither the Company nor the Trustee
nor any agent of either of them shall be held accountable by reason of any
disclosure of information as to names and addresses of Holders made pursuant to
the Trust Indenture Act.

Section 7.3  Reports by Trustee.
             ------------------ 

          (a) The Trustee shall transmit to Holders such reports concerning the
Trustee and its actions under this Indenture as may be required pursuant to the
Trust Indenture Act at the times and in the manner provided pursuant thereto. If
required by (S) 313(a) of the Trust Indenture Act, the Trustee shall, within 60
days after each May 15 following the date of this Indenture, deliver to Holders
a brief report, dated as of such May 15, which complies with the provisions of
such (S) 313(a).

                                       47
<PAGE>
 
          (b) A copy of each such report shall, at the time of such transmission
to Holders, be filed by the Trustee with each stock exchange upon which any
Securities are listed, with the Commission and with the Company. The Company
will notify the Trustee when any Securities are listed on any stock exchange.

Section 7.4  Reports by Company.
             ------------------ 

          (a) The Company covenants and agrees to file with the Trustee copies,
within 15 days after the Company is required to file the same with the
Commission, of the annual reports and of the information, documents and other
reports (or copies of such portions of any of the foregoing as the Commission
may from time to time by rules and regulations prescribe) which the Company may
be required to file with the Commission pursuant to Section 13 or Section 15(d)
of the Securities Exchange Act of 1934; or, if the Company is not required to
file information, documents or reports pursuant to either of such sections, then
to file with the Trustee and the Commission, in accordance with rules and
regulations prescribed from time to time by the Commission, such of the
supplementary and periodic information, documents and reports, if any, which may
be required pursuant to Section 13 of the Securities Exchange Act of 1934, in
respect of a security listed and registered on a national securities exchange as
may be prescribed from time to time in such rules and regulations.

          (b) The Company covenants and agrees to file with the Trustee and the
Commission, in accordance with the rules and regulations prescribed from time to
time by the Commission, such additional information, documents and reports, if
any, with respect to compliance by the Company with the conditions and covenants
provided for in this Indenture as may be required from time to time by such
rules and regulations.

          (c) The Company covenants and agrees to transmit by mail to all
Holders, as the names and addresses of such Holders appear upon the Security
Register, within 30 days after the filing thereof with the Trustee, such
summaries of information, documents and reports required to be filed by the
Company, if any, pursuant to subsections (a) and (b) of this Section 7.4 as may
be required by rules and regulations prescribed from time to time by the
Commission.

                                  ARTICLE VIII

              Consolidation, Merger, Conveyance, Transfer or Lease

Section 8.1  Company May Consolidate, Etc. Only on Certain Terms.
             --------------------------------------------------- 

          The Company shall not consolidate with or merge into any other
corporation or convey, transfer or lease its properties and assets substantially
as an entirety to any corporation, and the Company shall not permit any
corporation to consolidate with or merge into the

                                       48
<PAGE>
 
Company or convey, transfer or lease its properties and assets substantially as
an entirety to the Company, unless:

          (1) if the Company shall consolidate with or merge into another
     corporation or convey, transfer or lease its properties and assets
     substantially as an entirety to any corporation, the corporation formed by
     such consolidation or into which the Company is merged or the corporation
     which acquires by conveyance or transfer, or which leases, the properties
     and assets of the Company substantially as an entirety shall be a
     corporation, shall be organized and validly existing under the laws of the
     United States of America, any State thereof or the District of Columbia and
     shall expressly assume, by an indenture supplemental hereto, executed and
     delivered to the Trustee, in form satisfactory to the Trustee, the due and
     punctual payment of the principal of and any premium and interest on all
     the Securities and the performance or observance of every covenant of this
     Indenture on the part of the Company to be performed or observed;

          (2) immediately after giving effect to such transaction and treating
     any indebtedness for borrowed money or guarantee thereof which becomes an
     obligation of the Company or a Restricted Subsidiary as a result of such
     transaction as having been incurred by the Company or such Restricted
     Subsidiary at the time of such transaction, no Event of Default, and no
     event which, after notice or lapse of time or both, would become an Event
     of Default, shall have happened and be continuing;

          (3) if, as a result of any such consolidation or merger or such
     conveyance, transfer or lease, properties or assets of the Company or a
     Restricted Subsidiary, or any shares of capital stock or indebtedness of
     any Restricted Subsidiary, would become subject to a mortgage, pledge,
     lien, security interest or other encumbrance which would not be permitted
     by this Indenture, the Company or such successor corporation, as the case
     may be, shall take such steps as shall be necessary effectively to secure
     the Securities equally and ratably with (or prior to) all indebtedness
     secured thereby; and

          (4) the Company has delivered to the Trustee an Officers' Certificate
     and an Opinion of Counsel, each stating that such consolidation, merger,
     conveyance, transfer or lease and, if a supplemental indenture is required
     in connection with such transaction, such supplemental indenture comply
     with this Article and that all conditions precedent herein provided for
     relating to such transaction have been complied with.

Section 8.2  Successor Substituted.
             --------------------- 

          Upon any consolidation of the Company with, or merger of the Company
into, any other corporation or any conveyance, transfer or lease of the
properties and assets of the Company substantially as an entirety in accordance
with Section 8.1, the successor corporation formed by such consolidation or into
which the Company is merged or to which such conveyance, transfer or lease is
made shall succeed to, and be substituted for, and may exercise every right and
power of, the Company under this Indenture with the same effect as if such

                                       49
<PAGE>
 
successor corporation had been named as the Company herein; and in the event of
any such conveyance, transfer or lease, the Company (which term shall for this
purpose mean the corporation named as the Company or any successor corporation
which shall have theretofore become such in the manner prescribed in Section
8.1) shall be discharged from all liability under this Indenture and in respect
of the Securities and may be dissolved and liquidated.

                                   ARTICLE IX

                            Supplemental Indentures

Section 9.1  Supplemental Indentures Without Consent of Holders.
             -------------------------------------------------- 

          Without the consent of any Holders, the Company, when authorized by or
pursuant to a Board Resolution, and the Trustee, at any time and from time to
time, may enter into one or more indentures supplemental hereto, in form
satisfactory to the Trustee, for any of the following purposes:

          (1) to evidence the succession of another corporation to the Company
     and the assumption by any such successor of the covenants of the Company
     herein and in the Securities; or

          (2) to add to the covenants of the Company for the benefit of the
     Holders of all or any series of Securities (and if such covenants are to be
     for the benefit of less than all series of Securities, stating that such
     covenants are expressly being included solely for the benefit of such
     series) or to surrender any right or power herein conferred upon the
     Company; or

          (3) to add any additional Events of Default with respect to all or any
     series of Securities; or

          (4) to add to or change any of the provisions of this Indenture to
     such extent as shall be necessary to permit or facilitate the issuance of
     Securities in bearer form, registrable or not registrable as to principal,
     and with or without interest coupons, or to permit or facilitate the
     issuance of Securities in uncertificated form; or

          (5) to add to, change or eliminate any of the provisions of this
     Indenture in respect of one or more series of Securities, provided, that
     any such addition, change or elimination (i) shall neither (A) apply to any
     Security of any series created prior to the execution of such supplemental
     indenture and entitled to the benefit of such provision nor (B) modify the
     rights of the Holder of any such Security with respect to such provision or
     (ii) shall become effective only when there is no such Security
     Outstanding; or

                                       50
<PAGE>
 
          (6) to secure the Securities pursuant to the requirements of Section
     10.6 or otherwise; or

          (7) to establish the form or terms of Securities of any series as
     permitted by Sections 2.1 and 3.1; or

          (8) to evidence and provide for the acceptance of appointment
     hereunder by a successor Trustee with respect to the Securities of one or
     more series and to add to or change any of the provisions of this Indenture
     as shall be necessary to provide for or facilitate the administration of
     the trusts hereunder by more than one Trustee, pursuant to the requirements
     of Section 6.11(b); or

          (9) to cure any ambiguity, to correct or supplement any provision
     herein which may be inconsistent with any other provision herein, or to
     make any other provisions with respect to matters or questions arising
     under this Indenture, provided that such action pursuant to this clause (9)
     shall not adversely affect the interests of the Holders of Securities of
     any series in any material respect.

Section 9.2  Supplemental Indentures with Consent of Holders.
             ----------------------------------------------- 

          With the consent of the Holders of not less than a majority in
principal amount of the Outstanding Securities of each series affected by such
supplemental indenture, by Act of said Holders delivered to the Company and the
Trustee, the Company, when authorized by or pursuant to a Board Resolution, and
the Trustee may enter into an indenture or indentures supplemental hereto for
the purpose of adding any provisions to or changing in any manner or eliminating
any of the provisions of this Indenture or of modifying in any manner the rights
of the Holders of Securities of such series under this Indenture; provided,
however, that no such supplemental indenture shall, without the consent of the
Holder of each Outstanding Security affected thereby,

          (1) change the Stated Maturity of the principal of, or any installment
     of principal of or interest on, any Security, or reduce the principal
     amount thereof or the rate of interest thereon or the rate of accretion of
     any Original Issue Discount Security or any premium payable upon the
     redemption thereof, or reduce the amount of the principal of an Original
     Issue Discount Security that would be due and payable upon a declaration of
     acceleration of the Maturity thereof pursuant to Section 5.2, or change any
     Place of Payment where, or the coin or currency in which, any Security or
     any premium or interest thereon is payable, or impair the right to
     institute suit for the enforcement of any such payment on or after the
     Stated Maturity thereof (or, in the case of redemption, on or after the
     Redemption Date), or

          (2) reduce the percentage in principal amount of the Outstanding
     Securities of any series, the consent of whose Holders is required for any
     such supplemental indenture, or the consent of whose Holders is required
     for any waiver (of compliance

                                       51
<PAGE>
 
     with certain provisions of this Indenture or certain defaults hereunder and
     their consequences) provided for in this Indenture, or

          (3) modify any of the provisions of this Section, Section 5.8 or
     Section 5.13 except to increase any such percentage or to provide that
     certain other provisions of this Indenture cannot be modified or waived
     without the consent of the Holder of each Outstanding Security affected
     thereby, provided, however, that this clause shall not be deemed to require
     the consent of any Holder with respect to changes in the references to "the
     Trustee" and concomitant changes in this Section, or the deletion of this
     proviso, in accordance with the requirements of Sections 6.11(b) and
     9.1(8).

A supplemental indenture which changes or eliminates any covenant or other
provision of this Indenture which has expressly been included solely for the
benefit of one or more particular series of Securities, or which modifies the
rights of the Holders of Securities of such series with respect to such covenant
or other provision, shall be deemed not to affect the rights under this
Indenture of the Holders of Securities of any other series.

          It shall not be necessary for any Act of Holders under this Section to
approve the particular form of any proposed supplemental indenture, but it shall
be sufficient if such Act shall approve the substance thereof.

Section 9.3  Execution Of Supplemental Indentures.
             ------------------------------------ 

          In executing, or accepting the additional trusts created by, any
supplemental indenture permitted by this Article or the modifications thereby of
the trusts created by this Indenture, the Trustee shall be entitled to receive,
and (subject to Section 6.1) shall be fully protected in relying upon, an
Opinion of Counsel stating that the execution of such supplemental indenture is
authorized or permitted by this Indenture. The Trustee may, but shall not be
obligated to, enter into any such supplemental indenture which affects the
Trustee's own rights, duties or immunities under this Indenture or otherwise.

Section 9.4  Effect of Supplemental Indentures.
             --------------------------------- 

          Upon the execution of any supplemental indenture under this Article,
this Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every Holder
of Securities theretofore or thereafter authenticated and delivered hereunder
shall be bound thereby.

Section 9.5  Conformity with Trust Indenture Act.
             ----------------------------------- 

          Every supplemental indenture executed pursuant to this Article shall
conform to the requirements of the Trust Indenture Act.

                                       52
<PAGE>
 
Section 9.6  Reference in Securities to Supplemental Indentures.
             -------------------------------------------------- 

          Securities of any series authenticated and delivered after the
execution of any supplemental indenture pursuant to this Article may, and shall
if required by the Trustee, bear a notation in form approved by the Trustee as
to any matter provided for in such supplemental indenture. If the Company shall
so determine, new Securities of any series so modified as to conform, in the
opinion of the Trustee and the Company, to any such supplemental indenture may
be prepared and executed by the Company and authenticated and delivered by the
Trustee in exchange for Outstanding Securities of such series.

                                   ARTICLE X

                                   Covenants

Section 10.1  Payment of Principal, Premium and Interest.
              ------------------------------------------ 

          The Company covenants and agrees for the benefit of each series of
Securities that it will duly and punctually pay the principal of and any premium
and interest on the Securities of that series in accordance with the terms of
the Securities and this Indenture.

Section 10.2  Maintenance of Office or Agency.
              ------------------------------- 

          The Company will maintain in each Place of Payment for any series of
Securities an office or agency where Securities of that series may be presented
or surrendered for payment, where Securities of that series may be surrendered
for registration of transfer or exchange and where notices and demands to or
upon the Company in respect of the Securities of that series and this Indenture
may be served. The Company will give prompt written notice to the Trustee of the
location, and any change in the location, of such office or agency. If at any
time the Company shall fail to maintain any such required office or agency or
shall fail to furnish the Trustee with the address thereof, such presentations,
surrenders, notices and demands may be made or served at the Corporate Trust
Office of the Trustee, and the Company hereby appoints the Trustee as its agent
to receive all such presentations, surrenders, notices and demands.

          The Company may also from time to time designate one or more other
offices or agencies where the Securities of one or more series may be presented
or surrendered for any or all such purposes and may from time to time rescind
such designations; provided, however, that no such designation or rescission
shall in any manner relieve the Company of its obligation to maintain an office
or agency in each Place of Payment for Securities of any series for such
purposes. The Company will give prompt written notice to the Trustee of any such
designation or rescission and of any change in the location of any such other
office or agency.

                                       53
<PAGE>
 
Section 10.3  Money for Securities Payments to Be Held in Trust.
              ------------------------------------------------- 

          If the Company shall at any time act as its own Paying Agent with
respect to any series of Securities, it will, on or before each due date of the
principal of or any premium or interest on any of the Securities of that series,
segregate and hold in trust for the benefit of the Persons entitled thereto a
sum sufficient to pay the principal and any premium and interest so becoming due
until such sums shall be paid to such Persons or otherwise disposed of as herein
provided and will promptly notify the Trustee of its action or failure so to
act.

          Whenever the Company shall have one or more Paying Agents for any
series of Securities, it will, prior to each due date of the principal of or any
premium or interest on any Securities of that series, deposit with a Paying
Agent a sum sufficient to pay such amount, such sum to be held as provided by
the Trust Indenture Act, and (unless such Paying Agent is the Trustee) the
Company will promptly notify the Trustee of its action or failure so to act.

          The Company will cause each Paying Agent for any series of Securities
other than the Trustee to execute and deliver to the Trustee an instrument in
which such Paying Agent shall agree with the Trustee, subject to the provisions
of this Section, that such Paying Agent will (i) comply with the provisions of
the Trust Indenture Act applicable to it as a Paying Agent and (ii) during the
continuance of any default by the Company (or any other obligor upon the
Securities of that series) in the making of any payment in respect of the
Securities of that series, and upon the written request of the Trustee,
forthwith pay to the Trustee all sums held in trust by such Paying Agent for
payment in respect of the Securities of that series.

          The Company may at any time, for the purpose of obtaining the
satisfaction and discharge of this Indenture or for any other purpose, pay, or
by Company Order direct any Paying Agent to pay, to the Trustee all sums held in
trust by the Company or such Paying Agent, such sums to be held by the Trustee
upon the same trusts as those upon which such sums were held by the Company or
such Paying Agent; and, upon such payment by any Paying Agent to the Trustee,
such Paying Agent shall be released from all further liability with respect to
such money.

          Any money deposited with the Trustee or any Paying Agent, or then held
by the Company, in trust for the payment of the principal of or any premium or
interest on any Security of any series and remaining unclaimed for two years
after such principal, premium or interest has become due and payable shall be
paid to the Company, or (if then held by the Company) shall be discharged from
such trust; and the Holder of such Security shall thereafter, as an unsecured
general creditor, look only to the Company for payment thereof, and all
liability of the Trustee or such Paying Agent with respect to such trust money,
and all liability of the Company as trustee thereof, shall thereupon cease;
provided, however, that the Trustee or such Paying Agent, before being required
to make any such repayment, may at the expense of the Company cause to be
published once, in a newspaper published in the English language, customarily
published on each Business Day and of general circulation in New York, New York,
notice that such money remains unclaimed and that, after a date specified
therein, which shall

                                       54
<PAGE>
 
not be less than 30 days from the date of such publication, any unclaimed
balance of such money then remaining will be repaid to the Company.

Section 10.4  Statement by Officers as to Default.
              ----------------------------------- 

          The Company will deliver to the Trustee, within 120 days after the end
of each fiscal year of the Company ending after the date hereof, an Officers'
Certificate, stating whether or not to the best knowledge of the signers thereof
the Company is in default in the performance and observance of any of the terms,
provisions and conditions of this Indenture (without regard to any period of
grace or requirement of notice provided hereunder) and, if the Company shall be
in default, specifying all such defaults and the nature and status thereof of
which they may have knowledge.

Section 10.5  Existence.
              --------- 

          Subject to Article VIII, the Company will do or cause to be done all
things necessary to preserve and keep in full force and effect its existence,
rights (charter and statutory) and franchises; provided, however, that the
Company shall not be required to preserve any such right or franchise if the
Board of Directors shall determine that the preservation thereof is no longer
desirable in the conduct of the business of the Company and that the loss
thereof is not disadvantageous in any material respect to the Holders.

Section 10.6  Restrictions on Secured Funded Debt.
              ----------------------------------- 

          The Company will not, nor will it permit any Restricted Subsidiary to,
incur, issue, assume, guarantee or create any Secured Funded Debt, without
effectively providing concurrently with the incurrence, issuance, assumption,
guaranty or creation of any such Secured Funded Debt that the Outstanding
Securities (together with, if the Company shall so determine, any other
Indebtedness of the Company or such Restricted Subsidiary then existing or
thereafter created which is not subordinated to the Outstanding Securities)
shall be secured equally and ratably with (or prior to) such Secured Funded
Debt, so long as such Secured Funded Debt shall be secured by a Lien, unless,
after giving effect thereto, the sum of the aggregate amount of all outstanding
Secured Funded Debt of the Company and its Restricted Subsidiaries together with
all Attributable Debt in respect of sale and leaseback transactions relating to
a Principal Property (with the exception of Attributable Debt which is excluded
pursuant to clauses (1) to (6) of Section 10.7), would not exceed 15% of
Consolidated Net Tangible Assets; provided, however, that this Section 10.6
shall not apply to, and there shall be excluded from Secured Funded Debt in any
computation under this Section 10.6, Funded Debt secured by:

          (1) Liens on property, shares of capital stock or indebtedness of any
     corporation existing at the time such corporation becomes a Subsidiary;

          (2) Liens on property, shares of capital stock or indebtedness
     existing at the time of acquisition thereof or incurred within 180 days of
     the time of acquisition thereof

                                       55
<PAGE>
 
     (including, without limitation, acquisition through merger or
     consolidation) by the Company or any Restricted Subsidiary;

          (3) Liens on property, shares of capital stock or indebtedness
     hereafter acquired (or constructed) by the Company or any Restricted
     Subsidiary and created prior to, at the time of, or within 270 days after
     such acquisition (including, without limitation, acquisition through merger
     or consolidation) (or the completion of such construction or commencement
     of commercial operation of such property, whichever is later) to secure or
     provide for the payment of all or any part of the purchase price (or the
     construction price) thereof;

          (4) Liens in favor of the Company or any Restricted Subsidiary;

          (5) Liens in favor of the United States of America, any State thereof
     or the District of Columbia, or any agency, department or other
     instrumentality thereof, to secure partial, progress, advance or other
     payments pursuant to any contract or provisions of any statute;

          (6) Liens incurred or assumed in connection with an issuance of
     revenue bonds the interest on which is exempt from federal income taxation
     pursuant to Section 103(b) of the Internal Revenue Code of 1986, as
     amended;

          (7) Liens securing the performance of any contract or undertaking not
     directly or indirectly in connection with the borrowing of money, the
     obtaining of advances or credit or the securing of Funded Debt, if made and
     continuing in the ordinary course of business;

          (8) Liens incurred (no matter when created) in connection with the
     Company's or a Restricted Subsidiary's engaging in leveraged or single-
     investor lease transactions; provided, however, that the instrument
     creating or evidencing any borrowings secured by such Lien shall provide
     that such borrowings are payable solely out of the income and proceeds of
     the property subject to such Lien and are not a general obligation of the
     Company or such Restricted Subsidiary;

          (9) Liens under workers' compensation laws, unemployment insurance
     laws or similar legislation, or good faith deposits in connection with
     bids, tenders, contracts or deposits to secure public or statutory
     obligations of the Company or any Restricted Subsidiary, or deposits of
     cash or obligations of the United States of America to secure surety and
     appeal bonds to which the Company or any Restricted Subsidiary is a party
     or in lieu of such bonds, or pledges or deposits for similar purposes in
     the ordinary course of business, or Liens imposed by law, such as laborers'
     or other employees', carriers', warehousemen's, mechanics', materialmen's
     and vendors' Liens, and Liens arising out of judgments or awards against
     the Company or any Restricted Subsidiary with respect to which the Company
     or such Restricted Subsidiary at the time shall be

                                       56
<PAGE>
 
     prosecuting an appeal or proceedings for review and with respect to which
     it shall have secured a stay of execution pending such appeal or
     proceedings for review, or Liens for taxes not yet subject to penalties for
     nonpayment or the amount or validity of which is being in good faith
     contested by appropriate proceedings by the Company or any Restricted
     Subsidiaries, as the case may be, or minor survey exceptions, minor
     encumbrances, easements or reservations of, or rights of others for, rights
     of way, sewers, electric lines, telegraph and telephone lines and other
     similar purposes, or zoning or other restrictions or Liens as to the use of
     real properties, which Liens, exceptions, encumbrances, easements,
     reservations, rights and restrictions do not, in the opinion of the
     Company, in the aggregate materially detract from the value of said
     properties or materially impair their use in the operation of the business
     of the Company and its Restricted Subsidiaries;

          (10) Liens incurred to finance all or any portion of the cost of
     construction, alteration or repair of any Principal Property and
     improvements thereto prior to or within 270 days after completion of such
     construction, alteration or repair;

          (11) Liens outstanding on the date of this Indenture; or

          (12) any extension, renewal, refunding or replacement (or successive
     extensions, renewals, refundings or replacements), as a whole or in part,
     of any Lien referred to in the foregoing clauses (1) to (11), inclusive;
     provided, however, that (i) such extension, renewal, refunding or
     replacement Lien shall be limited to all or a part of the same property
     that secured the Lien extended, renewed, refunded or replaced (plus
     improvements on such property) and (ii) the Funded Debt secured by such
     Lien at such time is not increased.


Section 10.7  Limitation on Sales and Leasebacks.
              ---------------------------------- 

          The Company will not, nor will it permit any Restricted Subsidiary to,
enter into any arrangement with any Person providing for the leasing by the
Company or any Restricted Subsidiary of any Principal Property of the Company or
any Restricted Subsidiary, which Principal Property has been or is to be sold or
transferred by the Company or such Restricted Subsidiary to such Person (herein
referred to as a "sale and leaseback transaction") unless, after giving effect
thereto, the aggregate amount of all Attributable Debt with respect to all such
sale and leaseback transactions plus all Secured Funded Debt (with the exception
of Funded Debt secured by liens which is excluded pursuant to clauses (1) to
(12) of Section 10.6) would not exceed 15% of Consolidated Net Tangible Assets.
This covenant shall not apply to, and there shall be excluded from Attributable
Debt in any computation under Section 10.6 or this Section 10.7, Attributable
Debt with respect to, any sale and leaseback transaction if:

          (1) the Company or a Restricted Subsidiary is permitted to create
     Funded Debt secured by a Lien pursuant to clauses (1) to (12) of Section
     10.6 on the Principal

                                       57
<PAGE>
 
     Property to be leased, in an amount equal to the Attributable Debt with
     respect to such sale and leaseback transaction, without equally and ratably
     securing the Outstanding Securities;

          (2) the Company or a Restricted Subsidiary, within 270 days after the
     sale or transfer shall have been made by the Company or a Restricted
     Subsidiary, shall apply an amount in cash equal to the greater of (i) the
     net proceeds of the sale or transfer of the Principal Property leased
     pursuant to such arrangement or (ii) the fair market value of the Principal
     Property so leased at the time of entering into such arrangement (as
     determined by the Chief Executive Officer, the President, the Chief
     Financial Officer, the Treasurer or the Controller of the Company) to the
     retirement of Secured Funded Debt of the Company or any Restricted
     Subsidiary (other than Secured Funded Debt owned by the Company or any
     Restricted Subsidiary);

          (3) the Company or a Restricted Subsidiary invests the net proceeds,
     or an amount equal to the anticipated net proceeds, of the sale or transfer
     of the Principal Property leased pursuant to such transaction, within 270
     days prior to or subsequent to such sale or transfer, in other property
     having a fair market value (as determined by the Chief Executive Officer,
     the President, the Chief Financial Officer, the Treasurer or the Controller
     of the Company) at least equal to the fair market value of the Principal
     Property so leased;

          (4) the effective date of any such arrangement is within 270 days of
     the acquisition of the Principal Property (including, without limitation,
     acquisition by merger or consolidation) or the completion of construction
     and commencement of operation thereof, whichever is later;

          (5) the lease in such sale and leaseback transaction is for a term,
     including renewals, of not more than five years; or

          (6) such sale and leaseback transaction is entered into between the
     Company and a Restricted Subsidiary or between Restricted Subsidiaries.

Section 10.8  Waiver of Certain Covenants.
              --------------------------- 

          The Company may omit in any particular instance to comply with any
term, provision or condition set forth in Sections 10.6 to 10.7, inclusive, with
respect to the Securities of any series if before the time for such compliance
the Holders of at least a majority in principal amount of the Outstanding
Securities of such series shall, by Act of such Holders, either waive such
compliance in such instance or generally waive compliance with such term,
provision or condition, but no such waiver shall extend to or affect such term,
provision or condition except to the extent so expressly waived, and, until such
waiver shall become effective, the obligations of the Company and the duties of
the Trustee in respect of any such term, provision or condition shall remain in
full force and effect.

                                       58
<PAGE>
 
                                   ARTICLE XI

                            Redemption of Securities

Section 11.1  Applicability of Article.
              ------------------------ 

          Securities of any series which are redeemable before their Stated
Maturity shall be redeemable in accordance with their terms and (except as
otherwise specified as contemplated by Section 3.1 for Securities of any series)
in accordance with this Article.

Section 11.2  Election to Redeem; Notice to Trustee.
              ------------------------------------- 

          The election of the Company to redeem any Securities shall be
evidenced by a Board Resolution. In case of any redemption at the election of
the Company, the Company shall, at least 60 days, in the event of a redemption
of less than all the Securities of any series, or at least 45 days, in the event
of a redemption of all the Securities of any series, prior to the Redemption
Date fixed by the Company (unless a shorter notice shall be satisfactory to the
Trustee), notify the Trustee of such Redemption Date, of the principal amount of
Securities of such series to be redeemed and, if applicable, of the tenor of the
Securities to be redeemed. In the case of any redemption of Securities prior to
the expiration of any restriction on such redemption provided in the terms of
such Securities or elsewhere in this Indenture, the Company shall furnish the
Trustee with an Officers' Certificate evidencing compliance with such
restriction.

Section 11.3  Selection by Trustee of Securities to Be Redeemed.
              ------------------------------------------------- 

          If less than all the Securities of any series are to be redeemed
(unless all of the Securities of such series and of a specified tenor are to be
redeemed), the particular Securities to be redeemed shall be selected not more
than 60 days prior to the Redemption Date by the Trustee, from the Outstanding
Securities of such series not previously called for redemption, by such method
as the Trustee shall deem fair and appropriate and which may provide for the
selection for redemption of portions (equal to the minimum authorized
denomination for Securities of that series or any integral multiple thereof) of
the principal amount of Securities of such series of a denomination larger than
the minimum authorized denomination for Securities of that series. If less than
all of the Securities of such series and of a specified tenor are to be
redeemed, the particular Securities to be redeemed shall be selected not more
than 60 days prior to the Redemption Date by the Trustee, from the Outstanding
Securities of such series and specified tenor not previously called for
redemption in accordance with the preceding sentence.

          The Trustee shall promptly notify the Company in writing of the
Securities selected for redemption and, in the case of any Securities selected
for partial redemption, the principal amount thereof to be redeemed.

                                       59
<PAGE>
 
          For all purposes of this Indenture, unless the context otherwise
requires, all provisions relating to the redemption of Securities shall relate,
in the case of any Securities redeemed or to be redeemed only in part, to the
portion of the principal amount of such Securities which has been or is to be
redeemed.

 Section 11.4  Notice of Redemption.
               -------------------- 

          Notice of redemption shall be given by first-class mail, postage
prepaid, mailed not less than 30 nor more than 60 days prior to the Redemption
Date, to each Holder of Securities to be redeemed, at his address appearing in
the Security Register.

          All notices of redemption shall identify the Securities to be redeemed
(including, subject to Section 3.11, the CUSIP number) and shall state:

          (1) the Redemption Date,

          (2) the Redemption Price,

          (3) if less than all the Outstanding Securities of any series are to
     be redeemed, the identification (and, in the case of partial redemption of
     any Securities, the principal amounts) of the particular Securities to be
     redeemed,

          (4) that on the Redemption Date the Redemption Price will become due
     and payable upon each such Security to be redeemed and, if applicable, that
     interest thereon will cease to accrue on and after said date,

          (5) the place or places where such Securities are to be surrendered
     for payment of the Redemption Price, and

          (6) that the redemption is for a sinking fund, if such is the case.

          Notice of redemption of Securities to be redeemed at the election of
the Company shall be given by the Company or, at the Company's request, by the
Trustee in the name and at the expense of the Company.

Section 11.5  Deposit of Redemption Price.
              --------------------------- 

          Prior to any Redemption Date, the Company shall deposit with the
Trustee or with a Paying Agent (or, if the Company is acting as its own Paying
Agent, segregate and hold in trust as provided in Section 10.3) an amount of
money sufficient to pay the Redemption Price of, and (except if the Redemption
Date shall be an Interest Payment Date) accrued interest on, all the Securities
which are to be redeemed on that date.

                                       60
<PAGE>
 
Section 11.6  Securities Payable on Redemption Date.
              ------------------------------------- 

          Notice of redemption having been given as aforesaid, the Securities so
to be redeemed shall, on the Redemption Date, become due and payable at the
Redemption Price therein specified, and from and after such date (unless the
Company shall default in the payment of the Redemption Price and accrued
interest) such Securities shall cease to bear interest. Upon surrender of any
such Security for redemption in accordance with said notice, such Security shall
be paid by the Company at the Redemption Price, together with accrued interest
to the Redemption Date; provided, however, that, unless otherwise specified as
contemplated by Section 3.1, installments of interest whose Stated Maturity is
on or prior to the Redemption Date shall be payable to the Holders of such
Securities, or one or more Predecessor Securities, registered as such at the
close of business on the relevant Regular or Special Record Dates according to
their terms and the provisions of Section 3.7.

          If any Security called for redemption shall not be so paid upon
surrender thereof for redemption, the principal and any premium shall, until
paid, bear interest from the Redemption Date at the rate prescribed therefor in
the Security.

Section 11.7  Securities Redeemed in Part.
              --------------------------- 

          Any Security which is to be redeemed only in part shall be surrendered
at a Place of Payment therefor (with, if the Company or the Trustee so requires,
due endorsement by, or a written instrument of transfer in form satisfactory to
the Company and the Trustee duly executed by, the Holder thereof or his attorney
duly authorized in writing), and the Company shall execute, and the Trustee
shall authenticate and deliver to the Holder of such Security without service
charge, a new Security or Securities of the same series and of like tenor, of
any authorized denomination as requested by such Holder, in aggregate principal
amount equal to and in exchange for the unredeemed portion of the principal of
the Security so surrendered. If a Book-Entry Security is so surrendered, such
new Security so issued shall be a new Book-Entry Security.


                                  ARTICLE XII

                                 Sinking Funds

Section 12.1  Applicability of Article.
              ------------------------ 

          The provisions of this Article shall be applicable to any sinking fund
for the retirement of Securities of a series except as otherwise specified as
contemplated by Section 3.1 for Securities of such series.

          The minimum amount of any sinking fund payment provided for by the
terms of Securities of any series is herein referred to as a "mandatory sinking
fund payment," and any

                                      61
<PAGE>
 
payment in excess of such minimum amount provided for by the terms of Securities
of any series is herein referred to as an "optional sinking fund payment." If
provided for by the terms of Securities of any series, the cash amount of any
sinking fund payment may be subject to reduction as provided in Section 12.2.
Each sinking fund payment shall be applied to the redemption of Securities of
any series as provided for by the terms of Securities of such series.

Section 12.2  Satisfaction of Sinking Fund Payments with Securities.
              ----------------------------------------------------- 

          The Company (1) may deliver Outstanding Securities of a series (other
than any previously called for redemption) and (2) may apply as a credit
Securities of a series which have been redeemed either at the election of the
Company pursuant to the terms of such Securities or through the application of
permitted optional sinking fund payments pursuant to the terms of such
Securities, in each case in satisfaction of all or any part of any sinking fund
payment with respect to the Securities of such series required to be made
pursuant to the terms of such Securities as provided for by the terms of such
series; provided that such Securities have not been previously so credited. Such
Securities shall be received and credited for such purpose by the Trustee at the
Redemption Price specified in such Securities for redemption through operation
of the sinking fund and the amount of such sinking fund payment shall be reduced
accordingly.

Section 12.3  Redemption of Securities for Sinking Fund.
              ----------------------------------------- 

          Not less than 60 days prior to each sinking fund payment date for any
series of Securities, the Company will deliver to the Trustee an Officers'
Certificate specifying the amount of the next ensuing sinking fund payment for
that series pursuant to the terms of that series, the portion thereof, if any,
which is to be satisfied by payment of cash and the portion thereof, if any,
which is to be satisfied by delivering and crediting Securities of that series
pursuant to Section 12.2 and will also deliver to the Trustee any Securities to
be so delivered. Not less than 45 days before each such sinking fund payment
date the Trustee shall select the Securities to be redeemed upon such sinking
fund payment date in the manner specified in Section 11.3 and cause notice of
the redemption thereof to be given in the name of and at the expense of the
Company in the manner provided in Section 11.4. Such notice having been duly
given, the redemption of such Securities shall be made upon the terms and in the
manner stated in Sections 11.6 and 11.7.

                                      62
<PAGE>
 
                                 ARTICLE XIII

                      Defeasance and Covenant Defeasance

Section 13.1  Applicability of Article; Company's Option to Effect Defeasance
              or Covenant Defeasance.
              ---------------------- 

          If pursuant to Section 3.1 provision is made for either or both of (a)
defeasance of the Securities of a series under Section 13.2 or (b) covenant
defeasance of the Securities of a series under Section 13.3, then the provisions
of such Section or Sections, as the case may be, together with the other
provisions of this Article XIII, shall be applicable to the Securities of such
series, and the Company may at its option by Board Resolution, at any time, with
respect to the Securities of such series, elect to have either Section 13.2 (if
applicable) or Section 13.3 (if applicable) be applied to the Outstanding
Securities of such series upon compliance with the conditions set forth below in
this Article XIII.

 Section 13.2  Defeasance and Discharge.
               ------------------------ 

          Upon the Company's exercise of the above option applicable to this
Section, the Company shall be deemed to have been discharged from its
obligations with respect to the Outstanding Securities of such series on and
after the date the conditions precedent set forth below are satisfied
(hereinafter, "defeasance"). For this purpose, such defeasance means that the
Company shall be deemed to have paid and discharged the entire indebtedness
represented by the Outstanding Securities of such series and to have satisfied
all its other obligations under such Securities and this Indenture insofar as
such Securities are concerned (and the Trustee, at the expense of the Company,
shall execute proper instruments acknowledging the same), except for the
following which shall survive until otherwise terminated or discharged
thereunder: (A) the rights of Holders of Outstanding Securities of such series
to receive, solely from the trust fund described in Section 13.4 as more fully
set forth in such Section, payments of the principal of (and premium and
interest, if any, on) such Securities when such payments are due, (B) the
Company's obligations with respect to such Securities under Sections 3.4, 3.5,
3.6, 10.2 and 10.3 and such obligations as shall be ancillary thereto, (C) the
rights, powers, trusts, duties, immunities and other provisions in respect of
the Trustee or any Authenticating Agent hereunder and (D) this Article XIII.
Subject to compliance with this Article XIII, the Company may exercise its
option under this Section 13.2 notwithstanding the prior exercise of its option
under Section 13.3 with respect to the Securities of such series.

 Section 13.3  Covenant Defeasance.
               ------------------- 

          Upon the Company's exercise of the above option applicable to this
Section, the Company shall be released from its obligations under Sections 8.1,
10.6, 10.7 and 10.8 (and any covenant applicable to such Securities that are
determined pursuant to Section 3.1 to be subject to this provision) and the
occurrence of an event specified in Section 5.1(4) (with respect to any of
Sections 8.1, 10.6, 10.7 or 10.8) (and any other Event of Default applicable to
such

                                      63
<PAGE>
 
Securities that are determined pursuant to Section 3.1 to be subject to this
provision) shall not be deemed to be an Event of Default with respect to the
Outstanding Securities of such series on and after the date the conditions set
forth below are satisfied (hereinafter, "covenant defeasance"). For this
purpose, such covenant defeasance means that, with respect to the Outstanding
Securities of such series, the Company may omit to comply with and shall have no
liability in respect of any term, condition or limitation set forth in any such
Section or clause whether directly or indirectly by reason of any reference
elsewhere herein to any such Section or clause or by reason of any reference in
any such Section or clause to any other provision herein or in any other
document, but the remainder of this Indenture and such Securities shall be
unaffected thereby.

 Section 13.4  Conditions to Defeasance or Covenant Defeasance.
               ----------------------------------------------- 

          The following shall be the conditions precedent to application of
either Section 13.2 or Section 13.3 to the Outstanding Securities of such
series:

          (1) The Company shall irrevocably have deposited or caused to be
     deposited with the Trustee (or another trustee satisfying the requirements
     of Section 6.9 who shall agree to comply with the provisions of this
     Article XIII applicable to it) as trust funds in trust for the purpose of
     making the following payments, specifically pledged as security for, and
     dedicated solely to, the benefit of the Holders of such Securities, (A)
     money in an amount, or (B) U.S. Government Obligations which through the
     scheduled payment of principal and interest in respect thereof in
     accordance with their terms will provide, not later than one day before the
     due date of any payment, money in an amount, or (C) a combination thereof,
     sufficient, without reinvestment, in the opinion of a nationally recognized
     firm of independent public accountants expressed in a written certification
     thereof delivered to the Trustee, to pay and discharge, and which shall be
     applied by the Trustee (or other qualifying trustee) to pay and discharge,
     the principal of (and premium and interest, if any on) the Outstanding
     Securities of such series on the Maturity of such principal, or premium and
     interest, if any. Before such a deposit the Company may make arrangements
     satisfactory to the Trustee for the redemption of Securities at a future
     date or dates in accordance with Article XI, which shall be given effect in
     applying the foregoing. For this purpose, "U.S. Government Obligations"
     means securities that are (x) direct obligations of the United States of
     America for the payment of which its full faith and credit is pledged or
     (y) obligations of a Person controlled or supervised by and acting as an
     agency or instrumentality of the United States of America the payment of
     which is unconditionally guaranteed as a full faith and credit obligation
     by the United States of America, which, in either case, are not callable or
     redeemable at the option of the issuer thereof, and shall also include a
     depository receipt issued by a bank (as defined in section 3(a) (2) of the
     Securities Act of 1933, as amended) as custodian with respect to any such
     U.S. Government Obligation or a specific payment of principal of or
     interest on any such U.S. Government Obligation held by such custodian for
     the account of the holder of such depository receipt, provided that (except
     as required by law) such custodian is not authorized to make any deduction
     from the amount payable to the holder

                                      64
<PAGE>
 
     of such depositary receipt from any amount received by the custodian in
     respect of the U.S. Government Obligation or the specific payment of
     principal of or interest on the U.S. Government Obligation evidenced by
     such depositary receipt.

          (2) Such defeasance or covenant defeasance shall not (A) cause the
     Trustee for the Securities of such series to have a conflicting interest as
     defined in Section 6.8 or for purposes of the Trust Indenture Act with
     respect to any securities of the Company or (B) result in the trust arising
     from such deposit to constitute, unless it is qualified as, a regulated
     investment company under the Investment Company Act of 1940, as amended.

          (3) Such defeasance or covenant defeasance shall not result in a
     breach or violation of, or constitute a default under, this Indenture or
     any other agreement or instrument to which the Company is a party or by
     which it is bound.

          (4) In the case of an election under Section 13.2, the Company shall
     have delivered to the Trustee an Opinion of Counsel stating that (x) the
     Company has received from, or there has been published by, the Internal
     Revenue Service a ruling, or (y) since the date of this Indenture there has
     been a change in the applicable Federal income tax law, in either case to
     the effect that, and based thereon such opinion shall confirm that, the
     Holders of the Outstanding Securities of such series will not recognize
     income, gain or loss for Federal income tax purposes as a result of such
     defeasance and will be subject to Federal income tax on the same amounts,
     in the same manner and at the same times as would have been the case if
     such defeasance had not occurred.

          (5) In the case of an election under Section 13.3, the Company shall
     have delivered to the Trustee an Opinion of Counsel to the effect that the
     Holders of the Outstanding Securities of such series will not recognize
     income, gain or loss for Federal income tax purposes as a result of such
     covenant defeasance and will be subject to Federal income tax on the same
     amounts, in the same manner and at the same times as would have been the
     case if such covenant defeasance had not occurred.

          (6) Such defeasance or covenant defeasance shall be effected in
     compliance with any additional terms, conditions or limitations which may
     be imposed on the Company in connection therewith pursuant to Section 3.1.

          (7) The Company shall have delivered to the Trustee an Officers'
     Certificate and an Opinion of Counsel, each stating that all conditions
     precedent provided for relating to either the defeasance under Section 13.2
     or the covenant defeasance under Section 13.3 (as the case may be) have
     been complied with.

                                      65
<PAGE>
 
Section 13.5  Deposited Money and U.S. Government Obligations
              to be Held in Trust; Other Miscellaneous Provisions.
              --------------------------------------------------- 

          Subject to the provisions of the last paragraph of Section 10.3, all
money and U.S. Government Obligations (including the proceeds thereof) deposited
with the Trustee (or other qualifying trustee -- collectively, for purposes of
this Section 13.5, the "Trustee") pursuant to Section 13.4 in respect of the
Outstanding Securities of such series shall be held in trust and applied by the
Trustee, in accordance with the provisions of such Securities and this
Indenture, to the payment, either directly or through any Paying Agent (but not
including the Company acting as its own Paying Agent) as the Trustee may
determine, to the Holders of such Securities, of all sums due and to become due
thereon in respect of principal (and premium, if any) and interest, but such
money need not be segregated from other funds except to the extent required by
law.

          The Company shall pay and indemnify the Trustee against any tax, fee
or other charge imposed on or assessed against the money or U.S. Government
Obligations deposited pursuant to Section 13.4 or the principal and interest
received in respect thereof.

          Anything herein to the contrary notwithstanding, the Trustee shall
deliver or pay to the Company from time to time upon Company Request any money
or U.S. Government Obligations held by it as provided in Section 13.4 which, in
the opinion of a nationally recognized firm of independent public accountants
expressed in a written certification thereof delivered to the Trustee, are in
excess of the amount thereof which would then be required to be deposited to
effect an equivalent defeasance or covenant defeasance.

Section 13.6  Reinstatement.
              ------------- 

          If the Trustee or the Paying Agent is unable to apply any money in
accordance with Section 13.2 or 13.3 by reason of any order or judgment or any
court or governmental authority enjoining, restraining or otherwise prohibiting
such application, then the Company's obligations under the Securities of such
series shall be revived and reinstated as though no deposit had occurred
pursuant to this Article XIII until such time as the Trustee or Paying Agent is
permitted to apply all such money in accordance with Section 13.2 or 13.3;
provided, however, that if the Company makes any payment of principal of (and
premium, if any) or interest on any such Security following the reinstatement of
its obligations, the Company shall be subrogated to the rights of the Holders of
such Securities to receive such payment from the money held by the Trustee or
the Paying Agent.

          This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

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

                                      66
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have caused this Indenture to
be duly executed, and their respective corporate seals to be hereunto affixed
and attested, all as of the day and year first above written.



                                    NALCO CHEMICAL COMPANY


                                    By: /s/
                                       ----------------------------------------
                                    Name:
                                    Title:


                                    By: /s/
                                       ----------------------------------------
                                    Name:
                                    Title:
Attest:


  /s/
 ----------------------------



                                    THE CHASE MANHATTAN BANK
                                              As Trustee


                                    By: /s/
                                       ----------------------------------------
                                    Name:
                                    Title:


Attest:


/s/
- ------------------------------



                                       67

<PAGE>
 

STATE OF ILLINOIS        )
                         ) ss.:
COUNTY OF DuPAGE         )


          On the __th day of April _______, 1998, before me personally came
___________, to me known, who, being by me duly sworn, did depose and say that
he is the ____________________ of Nalco Chemical Company, one of the
corporations described in and which executed the foregoing instrument; that he
knows the seal of said corporation; that the seal affixed to said instrument is
such corporate seal; that it was so affixed by authority of the Board of
Directors of said corporation, and that he signed his name thereto by like
authority.


                                        /s/
                                      ----------------



STATE OF ______     )
                    ) ss.:
COUNTY OF______     )


          On the __th day of April _______, 1998, before me personally came
___________, to me known, who, being by me duly sworn, did depose and say that
he is the Authorized Signer of ________________, one of the corporations
described in and which executed the foregoing instrument; that he knows the seal
of said corporation; that the seal affixed to said instrument is such corporate
seal; that it was so affixed by authority of the Board of Directors of said
corporation, and that he signed his name thereto by like authority.





                                        /s/
                                      -----------------------------------------



                                       68

<PAGE>
 
                                                                       Exhibit 5


                                April 20, 1998



Nalco Chemical Company
One Nalco Center
Naperville, Illinois 60563-1196

Ladies and Gentlemen:

     We are representing Nalco Chemical Company (the "Company"), in connection
with the proposed sale of up to $400,000,000 principal amount of the Company's
unsecured debt securities (the "Securities"). The Securities are to be issued
under an Indenture (the "Indenture") to be entered into between the Company and
The Chase Manhattan Bank, as trustee, with certain terms of the Securities to be
approved by or pursuant to resolutions of the Board of Directors of the Company
as part of the corporate action taken and to be taken (the "Corporate
Proceedings") relating to the issuance of the Securities. We have examined or
are otherwise familiar with the Certificate of Incorporation of the Company, as
amended, the By-Laws of the Company, as amended, the Company's registration
statement pursuant to which the Securities are to be registered under the
Securities Act of 1933, the Corporate Proceedings and such other documents,
records, and instruments as we have deemed necessary for the purposes of this
opinion.

     Based on the foregoing, we are of the opinion that, upon the execution and
delivery of the Indenture, the completion of the Corporate Proceedings and the
execution, authentication, sale and delivery of the Securities issuable
thereunder, such Indenture will become a valid and binding instrument and the
Securities issuable thereunder will be legal, valid and binding obligations of
the Company, entitled to the benefits of the Indenture, including such terms as
are established pursuant to the Corporate Proceedings, in accordance with the
respective terms thereof, except as enforcement of provisions of the Indenture
and the Securities may be limited by bankruptcy or other laws of general
application affecting the enforcement of creditors' rights and by general equity
principles.

     We hereby consent to the filing of this opinion as Exhibit 5 to the
Company's registration statement and to being named in the prospectus under the
caption "Legal Matters" with respect to the matters stated therein.

                                       Very truly yours,





                                       MAYER, BROWN & PLATT

<PAGE>
 
                                                                     EXHIBIT 12
 
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
 
                    NALCO CHEMICAL COMPANY AND SUBSIDIARIES
 
<TABLE>
<CAPTION>
                                           YEAR ENDED DECEMBER 31,
                                      ----------------------------------------
                                       1997    1996    1995    1994      1993
                                      ------  ------  ------  ------    ------
                                         (MILLIONS OF DOLLARS, EXCEPT
                                                   RATIOS)
<S>                                   <C>     <C>     <C>     <C>       <C>
Earnings:
  Income from Continuing Operations
   before income taxes, extraordinary
   items and cumulative effect of
   accounting changes................ $256.3  $229.4  $213.4  $137.8    $210.7
Adjustments
  Fixed charges, as below............   21.6    21.9    23.3    26.8      32.1
  Interest capitalized...............   (0.2)   (0.4)   (0.5)   (0.2)      --
  Minority interest in income of
   majority-owned subsidiaries that
   have fixed charges................    2.1     3.4     3.0     2.8       2.6
  Equity in earnings of affiliates...   (1.7)   (1.6)   (1.7)   (1.4)     (1.1)
  Dividends from affiliates..........    0.4     0.9     0.3     0.9       0.4
                                      ------  ------  ------  ------    ------
Earnings as adjusted................. $278.5  $253.6  $237.8  $166.7    $244.7
                                      ======  ======  ======  ======    ======
Fixed charges:
  Interest on indebtedness, including
   interest capitalized.............. $ 15.2  $ 15.3  $ 17.6  $ 22.0    $ 27.5
  Portion of rent expense
   representative of the interest
   factor............................    6.4     6.6     5.7     4.8       4.6
                                      ------  ------  ------  ------    ------
  Total fixed charges................ $ 21.6  $ 21.9  $ 23.3  $ 26.8    $ 32.1
                                      ======  ======  ======  ======    ======
  Ratio of earnings to fixed charges.   12.9    11.6    10.2     6.2(A)    7.6
                                      ======  ======  ======  ======    ======
</TABLE>
- --------
(A) Included in earnings for 1994 was a pretax provision of $68.2 million for
    formation and consolidation expenses as disclosed in Note 3 to the
    Company's 1994 consolidated financial statements. If this provision had
    not been made, the ratio of earnings to fixed charges would have been 8.8.

<PAGE>
 
                                                                  EXHIBIT 23(A)
 
                      CONSENT OF INDEPENDENT ACCOUNTANTS
 
  We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Registration Statement on Form S-3 of our report
dated February 2, 1998, which appears on page 38 of the 1997 Annual Report to
Shareholders of Nalco Chemical Company, which is incorporated by reference in
Nalco Chemical Company's Annual Report on Form 10-K for the year ended
December 31, 1997. We also consent to the incorporation by reference of our
report on the Financial Statement Schedule, which appears on page 11 of such
Annual Report on Form 10-K. We also consent to the reference to us under the
heading "Experts" in such Prospectus.
 
                                          Price Waterhouse LLP
 
Chicago, Illinois
April 17, 1998

<PAGE>
 
________________________________________________________________________________


                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D. C.  20549
                           _________________________

                                   FORM  T-1
                                        
                            STATEMENT OF ELIGIBILITY
                    UNDER THE TRUST INDENTURE ACT OF 1939 OF
                   A CORPORATION DESIGNATED TO ACT AS TRUSTEE
                  ___________________________________________

              CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF
                A TRUSTEE PURSUANT TO SECTION 305(b)(2) ________
                    ________________________________________


                            THE CHASE MANHATTAN BANK
              (Exact name of trustee as specified in its charter)


New York                                                              13-4994650
(State of incorporation                                         (I.R.S. employer
if not a national bank)                                      identification No.)


270 Park Avenue
New York, New York                                                         10017
(Address of principal executive offices)                              (Zip Code)


                               William H. McDavid
                                General Counsel
                                270 Park Avenue
                            New York, New York 10017
                              Tel:  (212) 270-2611
           (Name, address and telephone number of agent for service)

                  ____________________________________________

                             NALCO CHEMICAL COMPANY
              (Exact name of obligor as specified in its charter)



Delaware                                                              36-1520480
(State or other jurisdiction of                                 (I.R.S. employer
incorporation or organization)                               identification No.)


One Nalco Center
Naperville, Illinois                                                       60563
(Address of principal executive offices)                              (Zip Code)


                  ____________________________________________

                                Debt Securities
                      (Title of the indenture securities)

                                        
________________________________________________________________________________


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