CABOT CORP
10-Q/A, 1997-02-21
MISCELLANEOUS CHEMICAL PRODUCTS
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<PAGE>
 
===============================================================================

                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                        
                                  FORM 10-Q/A
                          AMENDMENT NO.1 TO FORM 10-Q

   [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES 
                             EXCHANGE ACT OF 1934

                FOR THE QUARTERLY PERIOD ENDED DECEMBER 31, 1996

                                       OR

   [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES 
                             EXCHANGE ACT OF 1934

    FOR THE TRANSITION PERIOD FROM .................. TO .....................

                         COMMISSION FILE NUMBER 1-5667

                               CABOT CORPORATION
            (Exact name of Registrant as specified in its charter)

             DELAWARE                               04-2271897
     (State or other jurisdiction                 (IRS Employer
     of incorporation or organization)          Identification No.)

             75 STATE STREET
           BOSTON, MASSACHUSETTS                       02109
     (Address of Principal Executive Offices)        (Zip Code)

                                (617) 345-0100
             (Registrant's telephone number, including area code)

     Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.   Yes[X]  No[ ]


Indicate the number of shares outstanding of each of the issuer's class of
Common Stock, as of the latest practicable date.

      AS OF DECEMBER 31, 1996, THE COMPANY HAD 70,148,885 SHARES OF COMMON
                  STOCK, PAR VALUE $1 PER SHARE, OUTSTANDING.

================================================================================
<PAGE>
 
Item 6. Exhibits and Reports on Form 8-K
- ----------------------------------------

     (a)  Exhibits
          --------

          Two exhibits are added by this amendment to the Form 10-Q.  The
          exhibit numbers in the following list correspond to the number
          assigned to such exhibits in the Exhibit Table of Item 601 of
          Regulation S-K:
          

          Exhibit
          Number               Description
          ------               -----------
          4(a)                 Series A Fixed Rate Medium-Term Note
          4(b)                 Series A Floating Rate Medium-Term Note
            



                                   SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this amendment to be signed
on its behalf by the undersigned, thereunto duly authorized.

                                         CABOT CORPORATION (Registrant)


                                        By:  /s/ William F. Robinson, Jr.
                                             ----------------------------
                                               William F. Robinson, Jr.
                                               Assistant Secretary
     
 
Dated:  February 21, 1997

<PAGE>
 
                                                   EXHIBIT 4(A)

                          Fixed Rate Medium-Term Note

REGISTERED
No. R-                                             PRINCIPAL AMOUNT:
CUSIP

                               CABOT CORPORATION

                           SERIES A MEDIUM-TERM NOTE

    If the registered owner of this Security (as indicated below) is The
Depository Trust Company (the "Depository") or a nominee of the Depository, this
Security is a Global Security and the following two legends apply:

    This Security is a Global Security within the meaning of the Indenture
hereinafter referred to and is registered in the name of the Depository or a
nominee of the 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 nominee of the Depository to the Depository or another nominee of the
Depository or by the Depository or any such nominee to a successor of the
Depository or a nominee of such successor.

    Unless this Security is presented by an authorized representative of The
Depository Trust Company (55 Water Street, New York, New York) to the issuer or
its agent for registration of transfer, exchange or payment, and any Security
issued upon registration of transfer of, or in exchange for, or in lieu of, this
Security is registered in the name of Cede & Co. or such other name as requested
by an authorized representative of The Depository Trust Company and any payment
hereon is made to Cede & Co., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE
OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL since the registered owner hereof,
Cede & Co., has an interest herein.

IF APPLICABLE, THE "TOTAL AMOUNT OF OID", "YIELD TO MATURITY" AND "INITIAL
ACCRUAL PERIOD OID" (COMPUTED UNDER THE APPROXIMATE METHOD) BELOW WILL BE
COMPLETED SOLELY FOR THE PURPOSES OF APPLYING THE FEDERAL INCOME TAX ORIGINAL
ISSUE DISCOUNT ("OID") RULES.

ORIGINAL ISSUE PRICE:                      TOTAL AMOUNT OF OID:

INTEREST RATE:                             YIELD TO MATURITY:

INTEREST PAYMENT DATES:                    INITIAL ACCRUAL PERIOD OID:
     [June 15]
     [December 15]

REGULAR RECORD DATES:                      INITIAL REDEMPTION DATE:
     [June 1]
     (December 1]

ORIGINAL ISSUE DATE:                       REDEMPTION PRICES:
<PAGE>
 
MATURITY DATE:

SPECIFIED CURRENCY:                        OPTION TO ELECT
                                            REPAYMENT: [   ] YES  [   ] NO
EXCHANGE RATE AGENT:

MINIMUM DENOMINATIONS                      OPTIONAL REPAYMENT DATE[S]:
(OTHER THAN $1,000):
(Applicable only if
Specified Currency is
other than U.S. dollars)

BOOK ENTRY  ___                            CERTIFICATED  ___

OTHER TERMS:

          CABOT CORPORATION, a corporation duly organized and existing under the
laws of the State of Delaware (herein called the "Company", which term includes
any successor corporation under the Indenture hereinafter referred to), for
value received, hereby promises to pay to                          , or
registered assigns, the principal sum of                         on the Maturity
Date specified above (except to the extent redeemed or repaid prior to the
Maturity Date) and to pay interest thereon at a rate per annum equal to the
Interest Rate specified above from the Original Issue Date specified above or
from the most recent Interest Payment Date to which interest has been paid or
duly provided for, on the Interest Payment Dates in each year specified above
and on the Maturity Date (or any Redemption Date or Repayment Date as referred
to on the reverse hereof and hereafter referred to as a "Maturity Date" with
respect to the principal redeemed or repayable on such date) until the principal
hereof is paid or made available for payment.  Interest hereon is accrued from
and including the next preceding Interest Payment Date in respect of which
interest has been paid or duly provided for (or from and including the Original
Issue Date if no interest has been paid) to but excluding the succeeding
Interest Payment Date or Maturity Date, as the case may be.  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 (the "Holder") in
whose name this Security is registered (which, if this security is a Global
Security will be the Depository or a nominee of the Depository) at the close of
business on the Regular Record Date as specified above (whether or not a
Business Day) next preceding such Interest Payment Date; provided, however,
                                                         --------  ------- 
that, in the case of a Security issued between a regular Record Date and the
initial Interest Payment Date relating to such Regular Record Date, interest for
the period beginning on the Original Issue Date and ending on such Initial
Interest Payment Date shall be paid on the Interest Payment Date following the
next succeeding Regular Record Date to the Holder on such next succeeding
Regular Record Date; and provided, further, that interest payable on the
                         --------  -------                              
Maturity Date (other than a Maturity Date which is also an Interest Payment
Date) will be payable to the person to whom the principal hereof shall be
payable (which, if this Security is a Global Security will be the Depository or
a nominee of the Depository).  Any such interest not so punctually paid or duly
provided for on such Regular Record Date may either be paid to the person in
whose name this Security is registered at the close of business on a special
record date for the payment of such defaulted interest to be fixed by the
Company, notice of which shall be given to the registered Holders of Securities
of this Series not less than 15 days prior to such special record date, or be
paid at any time in any other lawful manner, all as more fully provided in said
Indenture.

     Any payment of principal (and premium, if any) or interest (if any) on this
Security due on any Interest Payment Date or Maturity Date which is not a
Business Day (as defined herein) shall not be made on such day, but shall be
made on the next succeeding Business Day with the same force and effect as if
made on such due date, and no interest shall accrue with respect to such payment
for the period from and after such Interest Payment Date or Maturity Date, as
the case may be.

                                       2
<PAGE>
 
     Unless otherwise specified above, all payments of principal, premium (if
any) and interest (if any) on this Security will be made in U.S. dollars
regardless of the Specified Currency shown above unless the Holder hereof makes
the election described below.  If the Specified Currency shown above is other
than U.S. dollars, the Company or its agent will arrange to convert all payments
in respect hereof into U.S. dollars in the manner described on the reverse
hereof; provided, however, that the Holder hereof may elect to receive all
        --------  -------                                                 
payments in such Specified Currency by delivery of a written request to the
Corporate Trust Division of the Trustee in The City of Boston, on or prior to
the applicable Regular Record Date or the date 15 days prior to the Maturity
Date, as the case may be.  Such request may be in writing (mailed or hand
delivered) or by cable, telex or other form of facsimile transmission.  The
Holder hereof may elect to receive payment in such Specified Currency for all
principal, premium, if any, and interest payments and need not file a separate
election for each payment.  Such election will remain in effect until revoked by
written notice to the Trustee, but written notice of any such revocation must be
received by the Trustee on or prior to the applicable Regular Record Date or the
date 15 days prior to the Maturity Date, as the case may be.  The Company has
initially appointed State Street Bank and Trust Company at its Corporate Trust
Division in The City of Boston as paying agent and State Street Bank and Trust,
N.A. in The City of New York as co-paying agent (each a "Paying Agent").

    If the principal, premium (if any) or interest (if any) due on this Security
is payable in a Specified Currency and such Specified Currency is not available
due to the imposition of exchange controls or other circumstances beyond the
control of the Company, the Company will be entitled to satisfy its obligations
to the Holder by making such payment in U.S. dollars on the basis of the most
recently available exchange rate as provided herein.

    In the event of an official redenomination of the Specified Currency, the
obligations of the Company with respect to payments on this Security shall, in
all cases, be deemed immediately following such redenomination to provide for
payment of that amount of redenominated currency representing the amount of such
obligations immediately before such redenomination.  In no event shall any
adjustment be made to any amount payable hereunder as a result of any change in
the value of the Specified Currency shown above relative to any other currency
due solely to fluctuations in exchange rates.

     If the Specified Currency is other than U.S. dollars, and the Holder has
elected to receive payments in such Specified Currency as provided for above,
payments of principal, premium (if any) and interest (if any) due on this
Security will be made by wire transfer of immediately available funds to an
account with a bank located in the country issuing the Specified Currency (or,
if specified on the face hereof that this Security shall be denominated in
European Currency Units ("ECUs"), to an ECU account) or other jurisdiction
acceptable to the Company and the Trustee as shall have been designated on or
prior to the relevant Regular Record Date or the date 15 days prior to the
Maturity Date, as the case may be, by the Holder hereof on the relevant Regular
Record Date or Maturity Date. Such designation shall be made by filing the
appropriate information with the Trustee at the Corporate Trust Division of the
Trustee in The City of Boston and, unless revoked, any such designation made
with respect to this Security by the Holder will remain in effect with respect
to any further payments with respect to this Security payable to such Holder.
If payment with respect to this Security cannot be made by wire transfer because
a required designation has not been received by the Trustee on or before the
requisite date or for any other reason, a notice will be mailed to the Holder at
its registered address requesting such a designation pursuant to which such wire
transfer can be made and, upon the Trustee's receipt of such designation, such
payment will be made within five Business Days of such receipt.  Simultaneously
with any election by the Holder hereof to receive payments in respect hereof in
the Specified Currency (if other than U.S. dollars), such Holder may provide
appropriate instructions to the Trustee, and all such payments will be made by
wire transfer of immediately available funds to an account maintained by the
payee with a bank, but only if such bank has appropriate facilities therefor.
The Company will pay any administrative costs imposed by banks in making
payments by wire transfer, but any tax, assessment or governmental charge
imposed upon payments will be borne by the Holders of the Securities in respect
of which such payments are made.

    Unless otherwise specified above, payments of interest other than interest
payable on the Maturity Date will be made by check mailed to the registered
Holder hereof at the address shown in the register of Securities

                                       3
<PAGE>
 
maintained by the Registrar or, at the option of the registered Holder hereof,
to such other place in the United States of America as the registered Holder
hereof shall designate to the Trustee in writing, or by wire transfer of
immediately available funds to such account as may have been appropriately
designated by such Holder.

    Unless otherwise specified above, the principal amount hereof and premium
(if any) and interest (if any) hereon payable on the Maturity Date will be paid
in immediately available funds upon surrender of this Security at the office of
State Street Bank and Trust, N.A. in The City of New York or at the Corporate
Trust Division of the Trustee in The City of Boston, provided that this Security
is presented to the Paying Agent in time for the Paying Agent to make such
payments in accordance with its normal procedures.  The Company may treat the
person in whose name this Security is registered as the owner of this Security
for the purpose of receiving payments of principal and interest on this Security
and for all purposes whatsoever.

    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.

                                       4
<PAGE>
 
                              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 December 1, 1987 (herein, together with all other
indentures supplemental thereto, including the First Supplemental Indenture
dated as of June 17, 1992 and the Second Supplemental Indenture dated as of
January 31, 1997, referred to as the "Indenture"), between the Company and State
Street Bank and Trust Company, as trustee (the "Trustee"), to which Indenture
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.

    If an Initial Redemption Date is specified on the face hereof, this Security
is subject to redemption at the election of the Company, as a whole or in part
in increments of $1,000, upon not less than 30 nor more than 60 days' notice by
mail prior to the Initial Redemption Date or at any time after the Initial
Redemption Date upon such notice, at the Redemption Prices, if any, specified on
the face hereof, (expressed in percentages of the principal amount), and
thereafter at a redemption price equal to 100% of the principal amount of this
Security or the portion thereof redeemed (or, if this Security is a Discount
Note, such lesser amount as is provided for below), plus accrued interest to the
date of redemption; provided, that interest installments due on such date of
redemption will be payable to the Holders of such Securities of record at the
close of business on the Regular Record Date referred to on the face hereof, all
as provided in the Indenture.  In the event of redemption of this Security in
part only, a new Security or Securities for the unredeemed portion hereof shall
be issued in the name of the Holder hereof upon the cancellation hereof.  If
less than all of the Securities with like tenor and terms to this Security are
to be redeemed, the Securities to be redeemed shall be selected by the Trustee
by such method as the Trustee shall deem fair and appropriate.

    If so specified on the face hereof, this Security will be repayable prior
to the Maturity Date at the option of the Holder on each applicable Optional
Repayment Date shown on the face hereof at a repayment price equal to 100% of
the principal amount to be repaid, together with accrued interest to the
Repayment Date.  In order for this Security to be repaid, the Trustee must
receive at least 30 but not more than 60 days prior to an Optional Repayment
Date this Security with the form below entitled "Option to Elect Repayment" duly
completed.  Any tender of this Security for repayment shall be irrevocable.  The
repayment option may be exercised by the Holder of this Security in whole or in
part in increments of $1,000.  Upon any partial repayment, this Security shall
be canceled and a new Security or Securities for the remaining principal amount
hereof shall be issued in the name of the Holder of this Security.

    Unless otherwise specified on the face hereof, this Security will not be
subject to any sinking fund.

    "Business Day" as used herein, means any day other than a Saturday or
Sunday, that is neither a legal holiday nor a day on which banks in The City of
New York are required or authorized by law or executive order to close; provided
that, if the Specified Currency shown above is other than U.S. dollars, such day
is also not a day on which banks are required or authorized by law or executive
order to close in the financial center of the country issuing the Specified
Currency (unless the Specified Currency is European Currency Units ("ECU"), in
which case such day is also not a day that appears as an ECU non-settlement day
on the display designated as "ISDE" on the Reuter Monitor Money Rates Service
(or is not a day designated as an ECU non-settlement day by the ECU Banking
Association) or, if ECU non-settlement days do not appear on that page (and are
not so designated), a day that is not a day on which payments in ECU cannot be
settled in the international interbank market); provided, further, that, with
respect to LIBOR Notes, such day is also a London Business Day (as hereinafter
defined).  "London Business Day" means a day on which dealings in the Designated
LIBOR Currency (as hereinafter defined) are transacted in the London interbank
market.

    Interest herein will be computed on the basis of a 360-day year of twelve
30-day months.

                                       5
<PAGE>
 
     If this is a Global Security, the total amount of any principal, premium
(if any) and interest (if any) due on this Security representing one or more
Book-Entry Notes on any Interest Payment Date or Maturity Date will be made
available to the Trustee on such date.  The Trustee will promptly make such
payments to the Depository.  The Depository will allocate such payments to each
Book-Entry Note represented by the Global Security and make payments to the
owners or holders thereof in accordance with its existing operating procedures.

     If the Specified Currency is other than U.S. dollars and the Holder hereof
fails to elect payment in such Specified Currency, the amount of any U.S. dollar
payment to be made in respect hereof will be determined by the Exchange Rate
Agent specified on the face hereof or a successor thereto (the "Exchange Rate
Agent") based on the bid quotation in The City of New York at approximately
11:00 A.M., New York City time, on the second Business Day preceding the
applicable payment date for the purchase by the Exchange Rate Agent of the
Specified Currency for U.S. dollars for settlement on such payment date in the
aggregate amount of the Specified Currency payable to all Holders of Notes
denominated in a foreign currency scheduled to receive U.S. dollar payments and
at which the Exchange Rate Agent commits to execute a contract.  If such bid
quotation is not available, or if the Specified Currency is other than U.S.
dollars and the Holder hereof elects payment in such Specified Currency,
payments will be made in such Specified Currency.

     If payment on this Security is required to be made in ECU and ECU is
unavailable due to the imposition of exchange controls or other circumstances
beyond the control of the Company, all payments due on that due date with
respect to this Security shall be made in U.S. dollars.  The amount so payable
on any date in ECU shall be converted into U.S. dollars, at a rate determined by
the Exchange Rate Agent as of the second Business Day prior to the date on which
such payment is due on the following basis.  The component currencies of the ECU
for this purpose (the "Components") shall be the currency amounts which were
components of the ECU as of the last date on which the ECU was available.  The
equivalent of the ECU in U.S. dollars shall be calculated by aggregating the
U.S. dollar equivalents of the Components.  The U.S. dollar equivalent of each
of the Components shall be determined by the Exchange Rate Agent on the basis of
the most recently available Market Exchange Rate, or as otherwise indicated
above.

     If the official unit of any component currency of the ECU is altered by way
of combination or subdivision, the number of units of that currency as a
Component shall be divided or multiplied in the same proportion.  If two or more
component currencies are consolidated into a single currency, the amounts of
those currencies as Components shall be replaced by an amount in such single
currency equal to the sum of the amounts of the consolidated component
currencies expressed in such single currency.  If any component currency is
divided into two or more currencies, the amount of that currency as a Component
shall be replaced by amounts of such two or more currencies, each of which shall
have a value on the date of division equal to the amount of the former component
currency divided by the number of currencies into which that currency was
divided.

     All determinations referred to above made by the Exchange Rate Agent shall
be at its sole discretion (except to the extent expressly provided that any
determination is subject to approval by the Company) and, in the absence of
manifest error, shall be conclusive for all purposes and binding on the Holder
of this Security and the Exchange Rate Agent shall have no liability therefor.

     All currency exchange costs will be borne by the Company unless the Holder
of this Security has made the election to receive payments in the Specified
Currency.  In that case, the Holder shall bear its pro rata portion of currency
exchange costs, if any, by deductions from payments otherwise due to such
Holder.

     References herein to "U.S. dollars" or "U.S. $" or "$" are to the currency
of the United States of America.

     If this Security is a Discount Note (any Security that for United States
federal income tax purposes would be considered to be issued with original issue
discount), in the event of either (a) a redemption by the Company of this
Security prior to its Maturity Date, or (b) the acceleration of the maturity of
this Security, the amount payable 

                                       6
<PAGE>
 
on this Security at the time of such redemption or acceleration, in lieu of the
principal amount due at the Maturity Date, shall be the Adjusted Issue Price (as
defined below) of this Security as of the date of such redemption or
acceleration. The "Adjusted Issue Price" of this Security shall be an amount
equal to (a) its Original Issue Price (as set forth on the face hereof), plus
(b) the portion of the Original Issue Discount (as set forth on the face hereof)
accrued under Section 1272 of the Code (without regard to Section 1272(a)(7) of
the Code) from the Original Issue Date (as set forth on the face hereof) to the
date of such redemption or acceleration, minus (c) any amount considered as part
of the stated redemption price at maturity (as determined under Section
1273(a)(2) of the Code) which was paid on this Security prior to the date of
such redemption or acceleration.

    If an Event of Default with respect to the Securities of this series shall
occur and be continuing, the principal of the Securities of this series (or, in
the case of any Securities of this series that are Discount Notes, the Adjusted
Issue Price as provided above), may be declared due and payable in the manner
and with the effect provided in the Indenture.

    The Indenture contains provisions for defeasance at any time of the entire
indebtedness of the Company on this Security 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 any series to be
affected under the Indenture at any time by the Company and the Trustee with the
consent of the Holders of 66-2/3% in principal amount of the Securities at the
time outstanding of each series to be affected by such amendment or modification
(each series voting separately as one class).  The Indenture also contains
provisions permitting the Holders of a majority in principal amount of the
outstanding Securities of each such series (each series voting separately as one
class), 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, premium (if any) and
interest on this Security at the times, place and rate (except as provided for
in such Security), and in the coin or currency, herein prescribed.

    As provided in the Indenture and subject to certain limitations (including,
in the case of any Global Security certain additional limitations) therein set
forth, the transfer of this Security is registrable in the register of
securities maintained by the Registrar, upon surrender of such Securities for
registration of transfer at the office or agency of the Registrar, duly endorsed
by, or accompanied by a written instrument of transfer in form satisfactory to
the Company and the Registrar duly executed by the Holder hereof or his attorney
duly authorized in writing, and thereupon one or more new Securities of like
tenor, of authorized denominations and for the same 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 $1,000 and any integral multiple of $1,000 in excess
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.

                                       7
<PAGE>
 
     Prior to due presentment of this Security for registration of transfer, the
Company or the Trustee and any agent of the Company or the Trustee may treat the
Holder 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.

     All terms used in this Security which are defined in the Indenture and are
not otherwise defined herein 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 Commonwealth of Massachusetts.

     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.

Dated:                              CABOT CORPORATION



                                    By:_________________________________
                                       Title:


                                    Attest:


                                    _________________________________
                                    Title:


TRUSTEE'S CERTIFICATE OF AUTHENTICATION

This is one of the Securities of the Series designated
therein issued under the within mentioned Indenture.


   STATE STREET BANK AND TRUST COMPANY,
   as Trustee



   By:____________________________________
   Title:

                                       8
<PAGE>
 
     The following abbreviations, when used in the inscription on the face of
this instrument, shall be construed as though they were written out in full
according to applicable laws or regulations:


TEN COM - as tenants in common      UNIF GIFT MIN ACT - ......Custodian.....

                                              (Cust)    (Minor)

                                              Uniform Gifts to Minors Act
TEN ENT - as tenants by the entireties        _______________________
                                                   (State)

JT TEN - as joint tenants with right of
     survivorship and not as tenants
     in common

Additional abbreviations may also be used though not in the above list.

               __________________________________________________

FOR VALUE RECEIVED, I or we sell, assign and transfer to

INSERT SOCIAL SECURITY OR OTHER
IDENTIFYING NUMBER OF ASSIGNEE:

___________________________________


________________________________________________________________________________
             (Print or type name, address and zip code of assignee)

________________________________________________________________________________


this Note and all rights hereunder and irrevocably appoint______________________
attorney to transfer this Note on the books of the Corporation. The agent may
substitute another to act for him.



Dated: _______________________    Signed: ___________________________________
Signature(s) Guaranteed by:                  (Sign exactly as name appears
                                             on the other side of this Note)


NOTICE:  The signature(s) to this assignment must correspond with the name as it
appears upon the face of the within Note in every particular, without alteration
or enlargement or any change whatever.
<PAGE>
 
                           OPTION TO ELECT REPAYMENT
                           -------------------------

     The undersigned hereby irrevocably requests and instructs the Company to
repay this Security (or the portion thereof specified below), pursuant to its
terms, on the Optional Repayment Date first occurring after the date of receipt
of the within Security as specified below (the "Repayment Date"), at a Repayment
                                                --------------                  
Price equal to 100% of the principal amount to be repaid, together with accrued
interest to the Repayment Date, to the undersigned at:

________________________________________________________________________________

________________________________________________________________________________
          (Please print or type name and address of the Undersigned.)

     For this Option to Elect Repayment to be effective, this Security with the
     ---------------------------------------- ---------------------------------
Option to Elect Repayment duly completed must be received by the Trustee at
- ------------------------------------------------------------ ----------- --
least 30 but not more than 60 days prior to the Repayment Date (or, if such
- ----- ---------------------------------------------------------------------
Repayment Date is not a Business Day, the next succeeding Business Day).
- ------------------------------------------------------------------------

     If less than the entire principal amount of the within Security is to be
repaid, specify the portion thereof (which shall be $1,000 or an integral
multiple thereof) which is to be repaid:  $__________________.

     If less than the entire principal amount of the within Security is to be
repaid, specify the denomination(s) of the Security(ies) to be issued for the
unpaid amount ($1,000 or any integral multiple of $1,000): $______________.


Dated:____________________          __________________________________

                                    Note:  The signature to this Option to Elect
                                    Repayment must correspond with the names as
                                    written upon the face of the within Security
                                    in every particular without alterations or
                                    enlargement or any change whatsoever.

<PAGE>
 
                                                                 EXHIBIT 4(B)


                    Floating Rate (Resetting Daily, Weekly,
                Monthly, Quarterly, Semi-Annually or Annually)
                               Medium-Term Note


REGISTERED
No. R-                         PRINCIPAL AMOUNT:
CUSIP


                               CABOT CORPORATION
                           SERIES A MEDIUM-TERM NOTE

     If the registered owner of this Security (as indicated below) is The
Depository Trust Company (the "Depository") or a nominee of the Depository, this
Security is a Global Security and the following two legends apply:

     This Security is a Global Security within the meaning of the Indenture
hereinafter referred to and is registered in the name of the Depository or a
nominee of the 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,
by a nominee of the Depository to the Depository or another nominee of the
Depository or by the Depository or any such nominee to a successor of the
Depository or a nominee of such successor.

     Unless this Security is presented by an authorized representative of The
Depository Trust Company (55 Water Street, New York, New York) to the issuer or
its agent for registration of transfer, exchange or payment, and any Security
issued upon registration of transfer of, or in exchange for, or in lieu of, this
Security is registered in the name of Cede & Co. or such other name as requested
by an authorized representative of The Depository Trust Company and any payment
hereon is made to Cede & Co., ANY TRANSFER PLEDGE OR OTHER USE HEREOF FOR VALUE
OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL since the registered owner hereof,
Cede & Co., has an interest herein.

     IF APPLICABLE, THE "TOTAL AMOUNT OF OID", "YIELD TO MATURITY" AND "INITIAL
ACCRUAL PERIOD OID" (COMPUTED UNDER THE APPROXIMATE METHOD) BELOW WILL BE
COMPLETED SOLELY FOR THE PURPOSES OF APPLYING THE FEDERAL INCOME TAX ORIGINAL
ISSUE DISCOUNT ("OID") RULES.

ORIGINAL ISSUE PRICE:               TOTAL AMOUNT OF OID:

                                    YIELD TO MATURITY:

                               
                                    INITIAL ACCRUAL PERIOD OID:

                                    INITIAL REDEMPTION DATE:

ORIGINAL ISSUE DATE:                REDEMPTION PRICES:

                                       1
<PAGE>
 
MATURITY DATE:

SPECIFIED CURRENCY:                     OPTION TO ELECT
                                         REPAYMENT: [ ] YES  [ ] NO
EXCHANGE RATE AGENT:

MINIMUM DENOMINATIONS                   OPTIONAL REPAYMENT DATE[S]:
(OTHER THAN $1,000):
(Applicable only if
Specified Currency is
other than U.S. dollars)

BASE RATE:                              INTEREST RESET DATE (applicable only if
                                        Interest Reset Period is semi-annual or
                                        annual) Third Wednesday of:


INITIAL INTEREST RATE:

INDEX MATURITY:                         INTEREST RATE BASIS:
                                        ___ Commercial Paper Rate
INTEREST PAYMENT DATES:                 ___ Prime Rate
                                        ___ LIBOR
REGULAR RECORD DATES:                   ___ Treasury Rate
     15 calendar days prior to each     ___ CD Rate
     Interest Payment Date              ___ Federal Funds Rate

SPREAD (plus or minus):                 MAXIMUM INTEREST RATE:


SPREAD MULTIPLIER:                      MINIMUM INTEREST RATE:

CALCULATION AGENT:

CALCULATION DATES:                      INTEREST RESET PERIOD:


BOOK ENTRY_____                         CERTIFICATED _____

OTHER TERMS:

     CABOT CORPORATION, a corporation duly organized and existing under the laws
of the State of Delaware (herein called the "Company", which term includes any
successor corporation under the indenture hereinafter referred to), for value
 eceived, hereby promises to pay to
                                          or registered assigns, the principal
sum of
          on the Maturity Date specified above (except to the extent redeemed or
repaid prior to the Maturity Date) and to pay interest thereon from the Original
Issue Date specified above or from the most recent Interest Payment Date (or, if
the Interest Reset Period specified above is daily or weekly, from the day
following the most recent Regular Record Date (as defined herein)) to which
interest has been paid or duly provided for, on the Interest Payment Dates in
each year specified herein and on the Maturity Date (or any Redemption Date or
Repayment Date as referred to on the reverse hereof and hereafter referred to as
a "Maturity Date" with respect to the principal redeemed or repayable on such
date), at a rate per annum equal to the Initial Interest Rate specified

                                       2
<PAGE>
 
above from the Original Issue Date until the first Interest Reset Date following
the Original Issue Date and on and after such Interest Reset Date at the rate
determined by reference to the Interest Rate Basis shown above plus or minus the
Spread, if any, or multiplied by the Spread Multiplier, if any, shown above,
determined in accordance with the provisions set forth herein, until the
principal hereof is paid or made available for payment.  Interest hereon is
accrued from and including the next preceding Interest Payment Date in respect
of which interest has been paid or duly provided for (or from and including the
Original Issue Date if no interest has been paid) to but excluding the
succeeding Interest Payment Date or Maturity Date, as the case may be; provided,
                                                                       -------- 
however, that if the Interest Reset period is daily or weekly, interest payable
- -------                                                                        
hereon on any Interest Payment Date, other than interest payable on the date on
which principal hereon is payable, will include interest accrued from, but
excluding, the Regular Record Date through which interest has been paid (or from
and including the Original Issue Date, if no interest has been paid with respect
hereto), to and including the Regular Record Date next preceding the applicable
Interest Payment Date.  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 (the "Holder") in whose name this Security is registered
(which, if this Security is a Global Security will be the Depository or a
nominee of the Depository) at the close of business on the Regular Record Date
(whether or not a Business Day) next preceding such Interest Payment Date;
provided, however, that, in the case of a Security Issued between a Regular
- --------  -------                                                          
Record Date and the initial Interest Payment Date relating to such Regular
Record Date, interest for the period beginning on the Original Issue Date and
ending on such initial Interest Payment Date shall be paid on the Interest
Payment Date following the next succeeding Regular Record Date to the Holder on
such next succeeding Regular Record Date; and provided, further, that interest
                                              --------  -------               
payable on the Maturity Date (other than a Maturity Date which is also an
Interest Payment Date) will be payable to the person to whom the principal
hereof shall be payable (which, if this Security is a Global Security will be
the Depository or a nominee of the Depository).  Any such interest not so
punctually paid or duly provided for on such Regular Record Date may either be
paid to the person in whose name this Security is registered at the close of
business on a special record date for the payment of such defaulted interest to
be fixed by the Company, notice of which shall be given to the registered
Holders of Securities of this Series not less than 15 days prior to such special
record date, or be paid at any time in any other lawful manner, all as more
fully provided in said Indenture.

     Any payment of interest on this Security due on any Interest Payment Date
which is not a Business Day (as defined herein) shall not be made on such day,
but shall be made on the next succeeding Business Day (or, if the Interest Rate
Basis specified above is LIBOR, if such day falls in the next calendar month,
the immediately preceding Business Day) with the same force and effect as if
made on such due date, and no interest shall accrue with respect to such payment
for the period from and after such date.  Any payment of principal, premium (if
any) or interest (if any) on this Security due on a Maturity Date which is not a
Business Day shall not be made on such day, but shall be made on the next
succeeding Business Day with the same force and effect as if made on such due
date, and no interest shall accrue with respect to such payment for the period
from and after such date,

     Unless otherwise specified above, all payments of principal, premium (if
any) and interest (if any) on this Security will be made in U.S. dollars
regardless of the Specified Currency shown above unless the Holder hereof makes
the election described below.  If the Specified Currency shown above is other
than U.S. dollars, the Company or its agent will arrange to convert all payments
in respect hereof into U.S. dollars in the manner described on the reverse
hereof; provided, however, that the Holder hereof may elect to receive all
        --------  -------                                                 
payments in such Specified Currency by delivery of a written request to the
Corporate Trust Division of the Trustee in The City of Boston, on or prior to
the applicable Regular Record Date or the date 15 days prior to the Maturity
Date, as the case may be.  Such request may be in writing (mailed or hand
delivered) or by cable, telex or other form of facsimile transmission.  The
Holder hereof may elect to receive payment in such Specified Currency for all
principal, premium, if any, and interest payments and need not file a separate
election for each payment.  Such election will remain in effect until revoked by
written notice to the Trustee, but written notice of any such revocation must be
received by the Trustee on or prior to the applicable Regular Record Date or the
date 15 days prior to the Maturity Date as the case may be.  The Company has
initially appointed State Street Bank and Trust Company at its Corporate Trust
Division in The City of Boston as paying agent and State Street Bank and Trust,
N.A. in The City of New York as co-paying agent (each a "Paying Agent").

                                       3
<PAGE>
 
     If the principal, premium (if any) or interest (if any) due on this
Security is payable in a Specified Currency and such specified Currency is not
available due to the imposition of exchange controls or other circumstances
beyond the control of the Company, the Company will be entitled to satisfy its
obligations to the Holder by making such payment in U.S. dollars on the basis of
the most recently available exchange rate as provided herein.

     In the event of an official redenomination of the Specified Currency, the
obligations of the Company with respect to payments on this Security shall, in
all cases, be deemed immediately following such redenomination to provide for
payment of that amount of redenominated currency representing the amount of such
obligations immediately before such redenomination.  In no event shall any
adjustment be made to any amount payable hereunder as a result of any change in
the value of the Specified Currency shown above relative to any other currency
due solely to fluctuations in exchange rates.

     If the Specified Currency is other than U.S. dollars, and the Holder has
elected to receive payments in such Specified Currency as provided for above,
payments of principal, premium (if any) and interest (if any) due on this
Security will be made by wire transfer of immediately available funds to an
account with a bank located in the country issuing the Specified Currency (or,
if specified on the face hereof that this Security shall be denominated in
European Currency Units ("ECUs") , to an ECU account) or other jurisdiction
acceptable to the Company and the Trustee as shall have been designated on or
prior to the relevant Regular Record Date or the date 15 days prior to the
Maturity Date, as the case may be, by the Holder hereof on the relevant Regular
Record Date or Maturity Date.  Such designation shall be made by filing the
appropriate information with the Trustee at the Corporate Trust Division of the
Trustee in The City of Boston and, unless revoked, any such designation made
with respect to this Security by the Holder will remain in effect with respect
to any further payments with respect to this Security payable to such Holder.
If payment with respect to this Security cannot be made by wire transfer because
a required designation has not been received by the Trustee on or before the
requisite date or for any other reason, a notice will be mailed to the Holder at
its registered address requesting such a designation pursuant to which such wire
transfer can be made and, upon the Trustee's receipt of such designation, such
payment will be made within five Business Days of such receipt.  Simultaneously
with any election by the Holder hereof to receive payments in respect hereof in
the Specified Currency (if other than U.S. dollars), such Holder may provide
appropriate instructions to the Trustee, and all such payments will be made by
wire transfer of immediately available funds to an account maintained by the
payee with a bank, but only if such bank has appropriate facilities therefor.
The Company will pay any administrative costs imposed by banks in making
payments by wire transfer, but any tax, assessment or governmental charge
imposed upon payments will be borne by the Holders of the Securities in respect
of which such payments are made.

     Unless otherwise specified above, payments of interest other than interest
payable on the Maturity Date will be made by check mailed to the registered
Holder hereof at the address shown in the register of Securities maintained by
the Registrar or, at the option of the registered Holder hereof, to such other
place in the United States of America as the registered Holder hereof shall
designate to the Trustee in writing, or by wire transfer of immediately
available funds to such account as may have been appropriately designated by
such Holder.

     Unless otherwise specified above, the principal amount hereof and premium
(if any) and interest (if any) hereon payable on the Maturity Date will be paid
in immediately available funds upon surrender of this Security at the office of
State Street Bank and Trust, N.A. in The City of New York or at the Corporate
Trust Division of the Trustee in The City of Boston, provided that this Security
is presented to the Paying Agent in time for the Paying Agent to make such
payments in accordance with normal procedures.  The Company may treat the person
in whose name this Security is registered as the owner of this Security for the
purpose of receiving payments of principal and interest on this Security and for
all purposes whatsoever.

     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.

                                       4
<PAGE>
 
                              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 December 1, 1987 (herein, together with
all other indentures supplemental thereto, including the First Supplemental
Indenture dated as of June 17, 1992 and the Second Supplemental Indenture dated
as of January 31, 1997, referred to as the "Indenture"), between the Company and
State Street Bank and Trust Company, as trustee (the "Trustee"), to which
Indenture 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.

     If an Initial Redemption Date is specified on the face hereof, this
Security is subject to redemption at the election of the Company, in whole or in
increments of $1,000, upon not less than 30 nor more than 60 days' notice by
mail prior to the Initial Redemption Date or at any time after the Initial
Redemption Date upon such notice, at the Redemption Prices, if any, specified on
the face hereof, (expressed in percentages of the principal amount), and
thereafter at a redemption price equal to 100% of this Security or the portion
thereof redeemed (or, if this Security is a Discount Security, such lesser
amount as is provided for below), plus accrued interest to the Redemption Date;
provided, that interest installments due on such date of redemption will be
payable to the Holders of such Securities of record at the close of business on
the Regular Record Date (as defined herein), all as provided in the Indenture.
In the event of redemption of this Security in part only, a new Security or
Securities for the unredeemed portion hereof shall be issued in the name of the
Holder hereof upon the cancellation hereof.  If less than all of the Securities
with like tenor and terms to this Security are to be redeemed, the Securities to
be redeemed shall be selected by the Trustee by such method as the Trustee shall
deem fair and appropriate.

     If so specified on the face hereof, this Security will be repayable prior
to the Maturity Date at the option of the Holder on each applicable Optional
Repayment Date shown on the face hereof at a repayment price equal to 100% of
the principal amount to be repaid, together with accrued interest to the
Repayment Date.  In order for this Security to be repaid, the Trustee must
receive at least 30 but not more than 60 days prior to an Optional Repayment
Date this Security with the form below entitled "Option to Elect Repayment" duly
completed.  Any tender of this Security for repayment shall be irrevocable.  The
repayment option may be exercised by the Holder of this Security in whole or in
part in increments of $l,000.  Upon any partial repayment, this Security shall
be cancelled and a new Security or Securities for the remaining principal amount
hereof shall be issued in the name of the Holder of this Security.

     Unless otherwise specified on the face hereof, this Security will not be
subject to any sinking fund.

     The rate of interest on this Security will be reset daily, weekly, monthly,
quarterly, semi-annually or annually (each an "Interest Reset Period"), as set
forth on the face hereof; provided, however, that the interest rate in effect
                          --------  -------                                  
from the Original Issue Date to the first Interest Reset Date (as defined below)
will be the Initial Interest Rate.  Except as provided in the next sentence, the
date or dates on which interest will reset (each an "Interest Reset Date") will
be, if this Security resets daily, each Business Day; if this Security resets
weekly (unless the Interest Rate Basis for this Security is the Treasury Rate),
the Wednesday of each week; if this Security resets weekly and the Interest
Reset Basis for this Security is the Treasury Rate, the Tuesday of each week
(except as provided below); if this Security resets monthly, the third Wednesday
of each month; if this Security resets quarterly, the third Wednesday of each
March, June, September and December; if this Security resets semiannually, the
third Wednesday of two months of each year, as specified herein; and if this
Security resets annually, the third Wednesday of one month of each year, as
specified herein.  If any Interest Reset Date would otherwise be a day that is
not a Business Day for this Security, the Interest Reset Date shall be postponed
to the next day that is a Business Day for this Security, except that if the
Interest Rate Basis specified herein is LIBOR and such Business Day is in the
next succeeding calendar month, such Interest Reset Date shall be the
immediately preceding Business Day.

                                       5
<PAGE>
 
    "Business Day," as used herein, means any day other than a Saturday or
Sunday, that is neither a legal holiday nor a day on which banks in The City of
New York are required or authorized by law or executive order to close; provided
that, if the Specified Currency shown above is other than U.S. dollars, such a
day is also not a day on which banks are required or authorized by law or
executive order to close in the financial center of the country issuing the
Specified Currency (unless the Specified Currency is European Currency Units
("ECU"), in which case such a day is also not a day that appears as an ECU non-
settlement day on the display designated as "ISDE" on the Reuter Monitor Money
Rates Service (or is not a day designated as an ECU non-settlement day by the
ECU Banking Association) or, if ECU non-settlement days do not appear on that
page (and are not so designated), a day that is not a day on which payments in
ECU cannot be settled in the international interbank market); provided, further,
that, with respect to LIBOR Notes, such day is also a London Business Day (as
hereinafter defined).  "London Business Day" means a day on which dealings in
the Designated LIBOR Currency (as hereinafter defined) are transacted in the
London interbank market.

     The rate of interest on this Security in effect on any day on or after the
first Interest Reset Date shall equal either (i) if such day is an Interest
Reset Date, the interest rate determined as of the Interest Determination Date
pertaining to such Interest Reset Date or (ii) if such day is not an Interest
Reset Date, the interest rate determined as of the Interest Determination Date
pertaining to the immediately preceding Interest Reset Date, subject, in either
case, to the Maximum Interest Rate or Minimum Interest Rate, if any; provided,
                                                                     -------- 
however, that the interest rate in effect from the date of issue to the first
- -------                                                                      
Interest Reset Date shall be the Initial Interest Rate.

     Except as otherwise specified in this paragraph, the rate of interest on
this Security for each Interest Reset Date shall be the rate determined in
accordance with the provisions below under the heading below corresponding to
the Interest Rate Basis specified herein:

          Commercial Paper Rate.  If the Interest Rate Basis of this Security is
     the Commercial Paper Rate, the interest rate hereon for any Interest Reset
     Date shall equal (a) the Money Market Yield (calculated as described below)
     of the per annum rate (quoted on a bank discount basis) on the relevant
     Commercial Paper Rate Interest Determination Date for commercial paper
     having the Index Maturity specified herein, (i) as such rate is published
     by the Board of Governors of the Federal Reserve System in "Statistical
     Release H.15(519), Selected Interest Rates" or any successor publication of
     the Board of Governors of the Federal Reserve System ("H.15(519)") under
     the heading "Commercial Paper" or (ii) if such rate is not published before
     9:00 A.M., New York City time, on the relevant Calculation Date, then as
     such rate is published by the Federal Reserve Bank of New York in its daily
     statistical release, "Composite 3:30 P.M. Quotations for U.S. Government
     Securities" or any successor publication published by the Federal Reserve
     Bank of New York ("Composite Quotations") under the heading "Commercial
     Paper" or (b) if by 3:00 P.M. New York City time, on such Calculation Date,
     such rate is not yet published in either H.15(519) or Composite Quotations,
     the Money Market Yield of the arithmetic mean of the offered per annum
     rates (quoted on a bank discount basis) as of 11:00 A.M., New York City
     time, on such Commercial Paper Rate Interest Determination Date, of three
     leading dealers of commercial paper in The City of New York selected by the
     Calculation Agent for commercial paper of the Index Maturity specified
     herein placed for an industrial issuer whose bond rating is "[      ]", or
     the equivalent, from a nationally recognized rating agency, in any of the
     above cases (a) or (b) as adjusted (x) by the addition or subtraction of
     the Spread, if any, specified herein, and/or then (y) by the multiplication
     by the Spread Multiplier, if any, and the Maximum Interest Rate or Minimum
     Interest Rate, if any, specified herein; provided, however, that, if fewer
                                              --------  -------                
     than three dealers selected as provided above by the Calculation Agent are
     quoting as mentioned in this sentence, the interest rate herein for such
     Interest Reset Date will be the interest rate hereon in effect on such
     Commercial Paper Rate Interest Determination Date.  "Money Market Yield"
     shall be a yield (expressed as a percentage) calculated in accordance with
     the following formula:

                                                  360 X D
               Money Market Yield =     100 X ___________________
                                                360 - (D X M)

                                       6
<PAGE>
 
     where "D" refers to the per annum rate for commercial paper, quoted on a
     bank discount basis and expressed as a decimal, and "M" refers to the
     actual number of days in the interest period for which the interest is
     being Calculated.

          Prime Rate.  If the Interest Rate Basis of this Security is the Prime
     Rate, the interest rate hereon for any Interest Reset Date shall equal
     (a)(i) the rate for the relevant Prime Rate Interest Determination Date set
     forth in H.15(519) under the heading "Bank Prime Loan", or (ii) if such
     rate is not published before 3:00 P.M., New York City time, on the relevant
     Calculation Date, then the arithmetic mean of the rates of interest
     publicly announced by each bank that appears on the Reuters Screen USPRIME1
     Page (as hereinafter defined) as such bank's prime rate or base lending
     rate as in effect for such Prime Rate Interest Determination Date as quoted
     on the Reuters Screen USPRIME1 Page on such Prime Rate Interest
     Determination Date or (b) if fewer than four such rates appear on the
     Reuters Screen USPRIME1 Page on such Prime Rate Interest Determination
     Date, the arithmetic mean of the prime rates or base lending rates (quoted
     on the basis of the actual number of days in the year divided by a 360-day
     year) as of the close of business on such Prime Rate Interest Determination
     Date by three major banks in The City of New York selected by the
     Calculation Agent, in any of the above cases (a) or (b) as adjusted (x) by
     the addition or subtraction of the Spread, if any, specified herein, and/or
     then (y) by the multiplication by the Spread Multiplier, if any, and the
     Maximum Interest Rate or Minimum Interest Rate, if any, specified herein;
     provided, however, that, if fewer than three banks selected as provided
     --------  -------                                                      
     above by the Calculation Agent are quoting as mentioned in this sentence,
     the interest rate hereon for such Interest Reset Date will be the interest
     rate hereon in effect on such Prime Rate Interest Determination Date.
     "Reuters Screen USPRIME1 Page" means the display on the Reuters Monitor
     Money Rates Service (or any successor service) on the "USPRIME1" page (or
     such other page as may replace the USPRIME1 page on such service) for the
     purpose of displaying prime rates or base lending rates of major United
     States banks.

          LIBOR.  If the Interest Rate Basis of this Security is LIBOR, the
     interest rate hereon for any Interest Reset Date shall be determined in
     accordance with the following provisions:

          (a)  On the relevant LIBOR Interest Determination Date, the interest
     rate will be determined on the basis of the offered rates for deposits of
     not less than U.S. $1,000,000 having the Index Maturity specified herein,
     commencing on the second London Banking Day immediately following such
     LIBOR Interest Determination Date, which appears on the display in the Dow
     Jones Telerate Service (or any successor service) on page 3750 ("Telerate
     Page 3750") as of 11:00 A.M., London time, on such LIBOR Interest
     Determination Date.  If at least two such offered rates appear on the
     Telerate Page 3750, the interest rate hereon for such Interest Reset Date
     will be the arithmetic mean of such offered rates as determined by the
     Calculation Agent, adjusted (x) by the addition or subtraction of the
     Spread, if any, specified herein, and/or then (y) by the multiplication by
     the Spread Multiplier, if any, and the Maximum Interest Rate or Minimum
     Interest Rate, if any, specified herein.  If fewer than two offered rates
     appear, the interest rate hereon for such LIBOR Interest Reset Date will be
     determined as described in (b) below.

          (b)  For a LIBOR Interest Determination Date on which fewer than two
     offered rates for the Index Maturity specified herein appear on the display
     designated as page "LIBO" on the Reuters Monitor Money Rates Service (or
     such other page as may replace the LIBO page as that service for the
     purpose of displaying London interbank offered rates of major banks), the
     interest rate hereon will be determined on the basis of the rates at
     approximately 11:00 A.M., London time, on such LIBOR Interest Determination
     Date at which deposits in U.S. dollars having the Index Maturity specified
     herein are offered to prime banks in the London interbank market by four
     major banks in the London interbank market selected by the Calculation
     Agent commencing on the second London Banking Day immediately following
     such LIBOR Interest Determination Date and in a principal amount equal to
     an amount of not less than U.S. $1,000,000 that in the Calculation Agent's
     judgment is representative for a single transaction in such market at such
     time (a "Representative Amount").  The Calculation Agent will request the
     principal London office of each

                                       7
<PAGE>
 
     of such banks to provide a quotation of its rate. If at least two such
     quotations are provided, the interest rate hereon with respect to such
     Interest Reset Date will be the arithmetic mean of such quotations, as
     adjusted (x) by the addition or subtraction of the Spread, if any,
     specified herein, and/or then (y) by the multiplication by the Spread
     multiplier, if any, and the Maximum Interest Rate or Minimum Interest Rate,
     if any, specified herein. If fewer than two quotations are provided, the
     interest rate hereon for such Interest Reset Date will be the arithmetic
     mean of the rates quoted at approximately 11:00 A.M., New York City time,
     on such LIBOR Interest Determination Date by three major banks in The City
     of New York, selected by the Calculation Agent, for loans in U.S. dollars
     to leading European banks having the Index Maturity specified herein
     commencing on the second London Banking Day immediately following such
     LIBOR Interest Reset Date and in a Representative Amount, as adjusted (x)
     by the addition or subtraction of the Spread, if any, specified herein,
     and/or then (y) by the multiplication by the Spread multiplier, if any, and
     the Maximum Interest Rate or Minimum Interest Rate, if any, specified
     herein; provided, however, that, if fewer than three banks selected as
             --------  ------- 
     provided above by the Calculation Agent are quoting as mentioned in this
     sentence, the interest rate hereon for such Interest Reset Date will be the
     interest rate hereon in effect on such LIBOR Interest Determination Date.

          Treasury Rate.  If the Interest Rate Basis of this Security is the
     Treasury Rate, the interest rate hereon for any Interest Reset Date shall
     equal (a) the rate for the most recent auction on the relevant Treasury
     Rate Interest Determination Date of direct obligations of the United States
     ("Treasury bills") having the Index Maturity specified herein, (i) as such
     rate is published in H.15(519) under the heading "U.S. Government
     Securities/Treasury Bills/Auction Average (Investment)" or (ii) if such
     rate is not so published by 9:00 A.M., New York City time, on the relevant
     Calculation Date, then the auction average rate (expressed as a bond
     equivalent, on the basis of a year of 365 or 366 days, as applicable, and
     applied on a daily basis) for such auction as otherwise announced by the
     United States Department of the Treasury or (b) if the results of such
     auction of Treasury bills having the Index Maturity specified herein are
     not published or reported as provided above by 3:00 P.M., New York City
     time, on such Calculation Date or if no such auction is held during such
     week, then the rate set forth in H.15(519) for the relevant Treasury Rate
     Interest Determination Date for the Index Maturity specified herein under
     the heading "U.S. Government Securities/Treasury Bills/Secondary Market" or
     (c) if such rate is not so published by 3:00 P.M., New York City time, on
     the relevant Calculation Date, then the yield to maturity (expressed as a
     bond equivalent, on the basis of a year of 365 or 366 days, as applicable,
     and applied on a daily basis) of the arithmetic mean of the secondary
     market bid rates as of approximately 3:30 P.M., New York City time, on such
     Treasury Rate Interest Determination Date, of three primary United States
     government securities dealers in The City of New York selected by the
     Calculation Agent for the issue of Treasury bills with a remaining maturity
     closest to the Index Maturity specified herein, in any of the above cases
     (a), (b) or (c) as adjusted (x) by the addition or subtraction of the
     Spread, if any, specified herein, and/or then (y) by the multiplication by
     the Spread Multiplier, if any, and the Maximum Interest Rate or Minimum
     Interest Rate, if any, specified herein; provided, however, that, if fewer
                                              --------  -------                
     than three dealers selected as provided above by the Calculation Agent are
     quoting as mentioned in this sentence, the interest rate hereon for such
     Interest Reset Date will be the interest rate hereon in effect on such
     Treasury Rate Interest Determination Date.

          CD Rate.  If the Interest Rate Basis of this Security is the CD Rate,
     the interest rate hereon for any Interest Reset Date shall equal (a) the
     rate on the relevant CD Rate Interest Determination Date for negotiable
     certificates of deposit having the Index Maturity specified herein (i) as
     published in H.15(519) under the heading "CDs (Secondary Market)" or (ii)
     if such rate is not published before 9:00 A.M., New York City time, on the
     relevant Calculation Date, then the rate on such CD Rate Interest
     Determination Date for negotiable certificates of deposit having the Index
     Maturity specified herein as published in Composite Quotations under the
     heading "Certificates of Deposit", or (b) if by 3:00 P.M., New York City
     time, on such Calculation Date such rate is not published in either
     H.15(519) or Composite Quotations, the arithmetic mean of the secondary
     market offered rates, as of 10:00 A.M., New York City time, on such CD Rate
     Interest Determination Date, of three leading nonbank dealers of negotiable
     U.S. dollar certificates of deposit in The City of New York selected by the
     Calculation Agent for negotiable certificates of deposit of

                                       8
<PAGE>
 
     major United States money center banks with a remaining maturity closest to
     the Index Maturity specified herein in a denomination of U.S. $5,000,000,
     in any of the above cases (a) or (b) as adjusted (x) by the addition or
     subtraction of the Spread, if any, specified herein, and/or then (y) by the
     multiplication by the spread multiplier, if any, and the Maximum Interest
     Rate or Minimum Interest Rate, if any, specified herein; provided, however,
                                                              --------  ------- 
     that, if fewer than three dealers selected as provided above by the
     Calculation Agent are quoting as mentioned in this sentence, the interest
     rate hereon for such Interest Reset Date will be the interest rate hereon
     in effect on such CD Rate Interest Determination Date.

          Federal Funds Rate.  If the Interest Rate Basis of this Security is
     the Federal Funds Rate, the interest rate hereon for any Interest Reset
     Date shall equal (a) the rate on the relevant Federal Funds Rate Interest
     Determination Date for Federal Funds (i) as published in H.15(519) under
     the heading "Federal Funds (Effective)" or (ii) if such rate is not
     Published before 9:00 A.M., New York City time, on the relevant Calculation
     Date, then the rate on such Federal Funds Interest Determination Date as
     published in Composite Quotations under the heading "Federal
     Funds/Effective Rate" or (b) if by 3:00 P.M., New York City time, on such
     Calculation Date such rate is not published in either H.15(519) or
     Composite Quotations, the arithmetic mean of the rates, as of 9:00 A.M.,
     New York City time, on such Federal Funds Rate Interest Determination Date,
     for the last transaction in overnight Federal Funds arranged by three
     leading brokers of Federal Funds transactions in The City of New York
     selected by the Calculation Agent, in any of the above cases (a) or (b) as
     adjusted (x) by the addition or subtraction of the Spread, if any,
     specified herein, and/or then (y) by the multiplication by the Spread
     Multiplier, if any, and the Maximum Interest Rate and Minimum Interest
     Rate, if any, specified herein; provided, however, that, if fewer than
                                     --------  -------                     
     three brokers selected as provided above by the Calculation Agent are
     quoting as mentioned in this sentence, the interest rate hereon for such
     Interest Reset Date will be the interest rate hereon in effect on such
     Federal Funds Rate Interest Determination Date.

Notwithstanding the foregoing, the interest rate hereon shall not be greater
than the Maximum Interest Rate, if any, or less than the Minimum Interest Rate,
if any, specified herein, In addition, the interest rate hereon will in no event
be higher than the maximum rate permitted by applicable law.

     The Company will at all times appoint and maintain a banking institution
that is not an Affiliate of the Company as Calculation Agent hereunder.  The
Company has initially appointed State Street Bank and Trust Company as such
Calculation Agent and will give prompt written notice to the Trustee of any
change in such appointment.  The Company will cause the Calculation Agent to
calculate the interest rate on this Security for any Interest Reset Date in
accordance with the foregoing on or before the Calculation Date pertaining to
the related Interest Determination Date.  Except as otherwise provided herein,
all percentages resulting from any calculations will be rounded upwards, if
necessary, to the nearest one hundred-thousandth of a percentage point, with
five one-millionths of a percentage point rounded upward (e.g., 9.876545% (or
 .09876545) being rounded to 9.87655% (or .0987655)), and all U.S. dollar amounts
used in or resulting from such calculations will be rounded to the nearest cent
(with one-half cent being rounded upwards).  The Calculation Agent's
determination of any interest rate will be final and binding in the absence of
manifest error.

     Upon the request of the Holder of this Security, the Calculation Agent will
provide to such Holder the interest rate hereon then in effect and, if
determined, the interest rate hereon which will become effective on the next
Interest Reset Date.

     The Interest Determination Date pertaining to an Interest Reset Date if the
rate of interest hereon shall be determined in accordance with the provisions
under the headings above entitled "Commercial Paper Rate" (the "Commercial Paper
Rate Interest Determination Date") , "Prime Rate" (the "Prime Rate Interest
Determination Date").  "CD Rate" (the "CD Rate Interest Determination Date") and
"Federal Funds Rate" (the "Federal Funds Rate Interest Determination Date") will
be the second Business Day preceding such Interest Reset Date.  The Interest
Determination Date pertaining to an Interest Reset Date if the rate of interest
hereon shall be determined in accordance with the provisions under the heading
"LIBOR" (the "LIBOR Interest Determination Date") will be the

                                       9
<PAGE>
 
second London Banking Day preceding such Interest Reset Date. The Interest
Determination Date pertaining to an Interest Reset Date if the rate of interest
hereon shall be determined in accordance with the provisions under the heading
above entitled "Treasury Rate" (the "Treasury Rate Interest Determination Date")
will be the day of the week in which such Interest Reset Date falls on which
Treasury bills would normally be auctioned. Treasury bills are normally sold at
auction on Monday of each week, unless that day is a legal holiday, in which
case the auction is usually held on the following Tuesday, except that such
auction may be held on the preceding Friday. If, as the result of a legal
holiday, an auction is so held on the preceding Friday, such Friday will be the
Treasury Rate Interest Determination Date pertaining to the Interest Reset Date
occurring in the next succeeding week. If an auction date shall fall on any
Interest Reset Date for a Treasury Rate Security, then such Interest Reset Date
shall instead be the first Business Day immediately following such auction date.

     Unless otherwise provided herein, the "Calculation Date", where applicable,
pertaining to any Interest Determination Date will be the earlier of (a) the
tenth calendar day after such Interest Determination Date or, if such day is not
a Business Day, the next succeeding Business Day, or (b) the Business Day
preceding the applicable Interest Payment Date or the Maturity Date (or date of
redemption or repayment), as the case may be.

     Interest will be payable on, if this Security resets (i) daily, weekly or
monthly, the third Wednesday of each month or on the third Wednesday of March,
June, September and December of each Year, as set forth on the face hereof; (ii)
quarterly, the third Wednesday of March, June, September and December of each
year; (iii) semi-annually, the third Wednesday of the two months set forth on
the face hereof; and (iv) annually, the third Wednesday of the two months or the
month set forth on the face hereof (each an "Interest Payment Date"), and in
each case, on the Maturity Date.

     Accrued interest hereon from the Original Issue Date or from last date to
which interest has been paid is calculated by multiplying the principal amount
of this Security by an accrued interest factor.  Such accrued interest factor is
computed by adding the interest factor calculated for each day from and
including the Original Issue Date, or from but excluding the last date to which
interest has been paid, and including the date for which accrued interest is
being calculated.  The interest factor (expressed as a decimal) for each such
day is computed by dividing the interest rate (expressed as a decimal)
applicable to such day by 360, in the case of Commercial Paper Rate Notes, Prime
Rate Notes, LIBOR Notes, CD Rate Notes or Federal Funds Rate Notes, or, the
Interest Rate Basis for this Security is the Treasury Rate, by the actual number
of days in the year.

     If this is a Global Security, the total amount of any principal, premium
(if any) and interest (if any) due on this Security representing one or more
Book-Entry Notes on any Interest Payment Date or Maturity Date will be made
available to the Trustee on such date.  The Trustee will promptly make such
payments to the Depository.  The Depository will allocate such payments to each
Book-Entry Note represented by the Global Security and make payments to the
owners or holders thereof in accordance with its existing operating procedures.

     If the Specified Currency is other than U.S. dollars and the Holder hereof
fails to elect payment in such Specified Currency, the amount of any U.S. dollar
payment to be made in respect hereof will be determined by the Exchange Rate
Agent specified on the face hereof or a successor thereto (the "Exchange Rate
Agent") based on the bid quotation in The City of New York at approximately
11:00 A.M., New York City time, on the second Business Day preceding the
applicable payment date for the purchase by the Exchange Rate Agent of the
Specified Currency for U.S. dollars for settlement on such payment date in the
aggregate amount of the Specified Currency payable to all Holders of Notes
denominated in a foreign currency scheduled to receive U.S. dollar payments and
at which the Exchange Rate Agent commits to execute a contract.  If such bid
quotation is not available, or if the Specified Currency is other than U.S.
dollars and the Holder hereof elects payment in such Specified Currency,
payments will be made in such Specified Currency.

     If payment on this Security is required to be made in ECU and ECU is
unavailable due to the imposition of exchange controls or other circumstances
beyond the control of the Company, all payments due on that due date with
respect to this Security shall be made in U.S. dollars.  The amount so payable
on any date in ECU shall be

                                       10
<PAGE>
 
converted into U.S. dollars, at a rate determined by the Exchange Rate Agent as
of the second Business Day prior to the date on which such payment is due on the
following basis. The component currencies of the ECU for this purpose (the
"Components") shall be the currency amounts which were components of the ECU as
of the last date on which the ECU was available. The equivalent of the ECU in
U.S. dollars shall be calculated by aggregating the U.S. dollar equivalents of
the Components. The U.S. dollar equivalent of each of the Components shall be
determined by the Exchange Rate Agent on the basis of the most recently
available Market Exchange Rate, or as otherwise indicated above.

     If the official unit of any component currency of the ECU is altered by way
of combination or subdivision, the number of units of that currency as a
Component shall be divided or multiplied in the same proportion.  If two or more
component currencies are consolidated into a single currency, the amounts of
those currencies as Components shall be replaced by an amount in such single
currency equal to the sum of the amounts of the consolidated component
currencies expressed in such single currency.  If any component currency is
divided into two or more currencies, the amount of that currency as a Component
shall be replaced by amounts of such two or more currencies, each of which shall
have a value on the date of division equal to the amount of the former component
currency divided by the number of currencies into which that currency was
divided.

     All determinations referred to above made by the Exchange Rate Agent shall
be at its sole discretion (except to the extent expressly provided that any
determination is subject to approval by the Company) and, in the absence of
manifest error, shall be conclusive for all purposes and binding on the Holder
of this Security and the Exchange Rate Agent shall have no liability therefor.

     All currency exchange costs will be borne by the Company unless the Holder
of this Security has made the election to receive payments in the Specified
Currency.  In that case, the Holder shall bear its pro rata portion of currency
exchange costs, if any, by deductions from payments otherwise due to such
Holder,

     References herein to "U.S. dollars" or "U.S.$" or "$" are to the currency
of the United States of America.

     If this Security is a Discount Note (any Security that for United States
federal income tax purposes would be considered to be issued with original issue
discount), in the event of either (a) a redemption by the Company of this
Security prior to its Maturity Date, or (b) the acceleration of the maturity of
this Security, the amount payable on this Security at the time of such
redemption or acceleration, in lieu of the principal amount due at the Maturity
Date, shall be the Adjusted Issue Price (as defined below) of this Security as
of the date of such redemption or acceleration.  The "Adjusted Issue Price" of
this Security shall be an amount equal to (a) its Original Issue Price (as set
forth on the face hereof), plus (b) the portion of the Original Issue Discount
(as set forth on the face hereof) accrued under Section 1272 of the Code
(without regard to Section 1272 (a) (7) of the Code) from the Original Issue
Date (as set forth on the face hereof) to the date of such redemption or
acceleration, minus (c) any amount considered as part of the stated redemption
price at maturity (as determined under Section 1273 (a) (2) of the Code) which
was paid on this Security prior to the date of such redemption or acceleration.

     If an Event of Default with respect to the Securities of this series shall
occur and be continuing, the principal of the Securities of this series (or, in
the case of any Securities of this series that are Discount Notes, the Adjusted
Issue Price as provided above) may be declared due and payable in the manner and
with the effect provided in the Indenture.

     The Indenture contains provisions for defeasance at any time of the entire
indebtedness of the Company on this Security 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 any series to be
affected under the Indenture at any time by the Company and the Trustee with the
consent of the Holders of 66 2/3% in principal amount of the Securities at the
time outstanding of each series to be affected by 

                                       11
<PAGE>
 
such amendment or modification (each series voting separately as one class). The
Indenture also contains provisions permitting the Holders of a majority in
principal amount of the outstanding Securities of each series (each series
voting separately as one class), 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, premium (if any) and
interest (if any) on this Security at the times, place and rate (except as
provided for in such Security), and in the coin or currency, herein prescribed.

     As provided in the Indenture and subject to certain limitations (including,
in the case of any Global Security certain additional limitations) therein set
forth, the transfer of this Security is registrable in the register of
securities maintained by the Registrar, upon surrender of such Securities for
registration of transfer at the office or agency of the Registrar, duly endorsed
by, or accompanied by a written instrument of transfer in form satisfactory to
the Company and the Registrar duly executed by the Holder hereof or his attorney
duly authorized in writing, and thereupon one or more new Securities of like
tenor, of authorized denominations and for the same 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 $1,000 and any integral multiple of $1,000 in excess
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 or the Trustee and any agent of the Company or the Trustee may treat the
Holder 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.

     All terms used in this Security which are defined in the Indenture and are
not otherwise defined herein 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 Commonwealth of Massachusetts.

     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.

                                       12
<PAGE>
 
     IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed under its corporate seal.

Dated:                              CABOT CORPORATION



                                    By:_________________________________
                                       Title:


                                    Attest:


                                    _________________________________
                                    Title:


TRUSTEE'S CERTIFICATE OF AUTHENTICATION

This is one of the Securities of the Series designated
therein issued under the within mentioned Indenture.


     STATE STREET BANK AND TRUST COMPANY,
     as Trustee



     By:____________________________________
     Title:

                                       13
<PAGE>
 
     The following abbreviations, when used in the inscription on the face of
this instrument, shall be construed as though they were written out in full
according to applicable laws or regulations:


TEN COM - as tenants in common      UNIF GIFT MIN ACT - ......Custodian.....

                                              (Cust)    (Minor)

                                              Uniform Gifts to Minors Act
TEN ENT - as tenants by the entireties        _______________________
                                                   (State)

JT TEN - as joint tenants with right of
     survivorship and not as tenants
     in common

Additional abbreviations may also be used though not in the above list.

               __________________________________________________

FOR VALUE RECEIVED, I or we sell, assign and transfer to

INSERT SOCIAL SECURITY OR OTHER
IDENTIFYING NUMBER OF ASSIGNEE:

___________________________________


________________________________________________________________________________
             (Print or type name, address and zip code of assignee)

________________________________________________________________________________


this Note and all rights hereunder and irrevocably appoint_____________________
attorney to transfer this Note on the books of the Corporation. The agent may
substitute another to act for him.



Dated: _______________________    Signed: ___________________________________
Signature(s) Guaranteed by:                 (Sign exactly as name appears
                                            on the other side of this Note)


NOTICE:  The signature(s) to this assignment must correspond with the name as it
appears upon the face of the within Note in every particular, without alteration
or enlargement or any change whatever.

                                       14
<PAGE>
 
                           OPTION TO ELECT REPAYMENT
                           -------------------------

    The undersigned hereby irrevocably requests and instructs the Company to
repay this Security (or the portion thereof specified below), pursuant to its
terms, on the Optional Repayment Date first occurring after the date of receipt
of the within Security as specified below (the "Repayment Date"), at a Repayment
                                                --------------                  
Price equal to 100% of the principal amount to be repaid, together with accrued
interest to the Repayment Date, to the undersigned at:

________________________________________________________________________________

________________________________________________________________________________
          (Please print or type name and address of the Undersigned.)

     For this Option to Elect Repayment to be effective, this Security with the
     --------------------------------------------------------------------------
Option to Elect Repayment duly completed must be received by the Trustee at
- ---------------------------------------------------------------------------
least 30 but not more than 60 days prior to the Repayment Date (or, if such
- -----=---------------------------------------------------------------------
Repayment Date is not a Business Day, the next succeeding Business Day).
- ------------------------------------------------------------------------

     If less than the entire principal amount of the within Security is to be
repaid, specify the portion thereof (which shall be $1,000 or an integral
multiple thereof) which is to be repaid:  $___________________.

     If less than the entire principal amount of the within Security is to be
repaid, specify the denomination(s) of the Security(ies) to be issued for the
unpaid amount ($1,000 or any integral multiple of $1,000): $________________.


Dated:____________________          __________________________________

                                    Note:  The signature to this Option to Elect
                                    Repayment must correspond with the names as
                                    written upon the face of the within Security
                                    in every particular without alterations or
                                    enlargement or any change whatsoever.

                                       15


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