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                                                                EX-10.(d)(vi)

                                AMENDMENT 1997-I
                                       TO
                                CABOT CORPORATION
                           DEFERRED COMPENSATION PLAN


        Cabot Corporation, a Delaware corporation (the "Company"), pursuant to
Section 9 of the Cabot Corporation Deferred Compensation Plan (the "Plan"),
hereby amends the Plan, as follows, effective as of June 1, 1997:

1.      Section 1 is amended by inserting the phrase "and non-employee
directors" after the word "employees".

2.      The following defined terms are added to Section 2 immediately following
the definition of "CRISP":

            "Director": Any member of the Board other than an employee of any 
            Employer.

            "Director Fees": The cash annual retainer fees and meeting fees paid
            by the Company as compensation for service on the Board or any
            committee thereof.

3.      The definitions of "Eligible Pay", "Moody's Rate" and "Participant" in
Section 2 are amended in their entireties to read as follows:

            "Eligible Pay": Except as otherwise determined by the Administrator,
            Eligible Pay shall include (i) in the case of an Eligible Employee:
            base salary, amounts payable under the Company's short-term
            incentive program, and sales incentive bonuses; (ii) in the case of
            a Consultant: the consulting fees payable by the Employer; and (iii)
            in the case of a Director: Director Fees. The Administrator in its
            discretion may include other categories of remuneration in, or
            exclude categories of remuneration from, the definition of "Eligible
            Pay," either in general or in particular cases; provided, that any
            such change affecting Director Fees shall also require the approval
            of the Board.

            "Moody's Rate": For any calendar year, the interest rate specified
            in Moody's Bond Record under the heading of "Moody's Corporate Bond
            Yield Averages -- Av. Corp.," as published for the month of November
            preceding the calendar year.

            "Participant": A Consultant, Eligible Employee or Director who 
            participates in the Plan.



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4.      Section 2 is further amended by (i) adding the phrase ", and to
Directors" at the end of the definition of "Employer" and (ii) adding the
following to the definition of "Earnings Measure":

            In the case of Eligible Pay deferred by a Director, the Earnings
            Measure applied under Section 4(b) below shall be limited to one of
            the following: (i) a notional interest rate equal (for each year) to
            the Moody's Rate for such year, or (ii) deemed investment in (i.e.
            phantom units of) common stock of the Company. If the Earnings
            measure is based on the Moody's Rate, all Eligible Pay deferred by a
            Director during a calendar year shall be credited to the Director's
            Account as of the first day of such calendar year. If the Earnings
            Measure is based on common stock of the Company, all Eligible Pay
            deferred by a Director during a calendar quarter shall be credited
            to the Director's Account in phantom stock units as of, and based on
            the closing price for the Company common stock on the New York Stock
            Exchange on, the last trading day of such quarter, and phantom
            dividends on such Account (based on the balance of phantom stock
            units in such Account on the record date for each dividend declared
            on shares of Company common stock) shall be added to such Account in
            phantom stock units as of, and based on the closing price for the
            common stock on the New York Stock Exchange on, the date dividends
            are actually paid on the common stock.

5.      Section 3 is amended by adding thereto a new Section 3(e) to read in its
entirety as follows:

               (e)     SPECIAL RULES FOR DIRECTORS. The provisions of this
               Section 3(e) shall apply, in the case of a Director, in lieu of
               the provisions of Sections 3(a) through (d) above. A Director may
               defer up to 100% of any Eligible Pay for any calendar year
               commencing on or after January 1, 1998 by completing and
               delivering a deferral election in accordance with Section 3(d)
               above not later than September 15 of the preceding year. A
               Director who is serving as such on June 1, 1997 may defer up to
               100% of any Eligible Pay earned in the third and fourth quarters
               of calendar year 1997 by completing and delivering a deferral
               election in accordance with Section 3(d) above not later than
               June 30, 1997. Any individual who becomes a Director after June
               1, 1997 may elect within 30 days after becoming a Director to
               defer up to 100% of any Eligible Pay earned in the remainder of
               the calendar year in which such individual becomes a Director
               (and the following calendar year, if such individual becomes a
               Director between August 16 and December 31 of any calendar year)
               by completing and delivering a deferral election in accordance
               with Section 3(d) above within such 30-day period. A Director's
               Eligible Pay shall be treated as earned on the date it would be
               paid if not deferred hereunder. The minimum amount that a
               Director may defer for any calendar year shall be $2,000.



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6.      Section 4(b) is amended in its entirety to read as follows:

               (b)     NOTIONAL EARNINGS. Not less frequently than annually, the
               Administrator shall adjust each Participant's Account to reflect
               notional earnings. Notional earnings shall be based on one
               Earnings Measure selected by the Participant from such Earnings
               Measures as the Administrator may specify. Subject to Sections
               5(e)(iii) and (iv) below, the next sentence and such other rules
               and regulations as the Administrator may require, the
               Administrator may, but need not, permit Participants to (i)
               select an Earnings Measure that will apply to their Accounts from
               among those specified by the Administrator, and (ii) change such
               Earnings Measure to another specified Earnings Measure.
               Notwithstanding any provision of this Plan to the contrary, (i) a
               Participant may only select one Earnings Measure to apply to his
               or her entire Account at any one time, and (ii) the effective
               date of any change in Earnings Measure must be a prospective
               January 1. The Administrator shall have the absolute discretion
               at any time to alter or amend the Earnings Measures used in
               valuing and adjusting Accounts; provided, that the Administrator
               may not, without the written consent of the affected Participant,
               alter any Earnings Measure retroactively to the extent that the
               effect of such alteration would be to reduce the balance of the
               Participant's Account below what it was immediately prior to such
               alteration. Nothing herein shall be construed as obligating the
               Administrator or any Employer to set aside assets or establish a
               trust or other fund for purposes of the Plan.

7.      Section 5(a) is amended by (i) inserting the phrase ", service as a 
Director" after the word "employment" the first, second and fourth times it
appears, (ii) replacing the phrase "termination of employment or termination of
the consulting relationship," with the phrase "termination of the Participant's
employment, service as a Director or consulting relationship with the Employer"
and (iii) deleting the word "equal".

8.      Section 5(e) is amended in its entirety to read as follows:

               (e)     COMPUTATION OF INSTALLMENT PAYMENTS, ETC. If any Account 
               is to be distributed in installments, the amount of each such
               installment shall be determined applying the following special
               rules:

                       (i)   If the Earnings Measure in effect for the Account
                   when installments begin is the Moody's Rate, the amount of
                   each installment shall be determined so as to result in equal
                   installments over the installment period, applying the
                   following special rules: (x) the Earnings Measure used to
                   measure notional earnings with respect to the declining
                   Account balance over the course of the installment period
                   shall be a fixed rate equal to the average of the Moody's
                   Rate for the year in which the installment distributions
                   commence and the preceding four calendar years, and (y)
                   notional earnings shall be determined by assuming that the
                   Account is reduced at the beginning 



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                   of each year in the installment period by the aggregate
                   amount of the installment payments to be made for that year.

                        (ii)  If the Earnings Measure in effect for the Account
                   is not the Moody's Rate, the Account balance of the
                   Participant shall be calculated as of the close of business
                   on the first business day of each month during the
                   installment period, and the monthly installment for that
                   month shall be calculated by dividing this balance by the
                   remaining number of monthly payments due the Participant. By
                   way of example, if the Participant elects 120 monthly
                   installments, the first payment shall be 1/120 of the account
                   balance, calculated as of the first business day of the first
                   month. The following month, the payment shall be 1/119 of the
                   account balance, calculated as of the first business day of
                   the second month.

                       (iii) If the Earnings Measure in effect for the Account
                   when installments begin is not the Moody's Rate, the
                   Participant, subject to Section 4(b) above, may at any time
                   during the installment period change the Earnings Measure in
                   effect for the Account to the Moody's Rate effective as of
                   the next January 1. The Account balance as of such January 1
                   shall be paid out in equal installments over the remainder of
                   the installment period, with the amount of the installments
                   determined applying the following special rules: (x) the
                   Earnings Measure used to measure notional earnings with
                   respect to the declining Account balance over the remainder
                   of the installment period shall be a fixed rate equal to the
                   average of the Moody's Rate for the calendar year in which
                   the equal installment distributions commence and the
                   preceding four calendar years, and (y) notional earnings
                   shall be determined by assuming that the Account is reduced
                   at the beginning of each year in the remainder of the
                   installment period by the aggregate amount of the installment
                   payments to be made for that year.

                       (iv)  Notwithstanding any provision of this Plan to the
                   contrary, if the Earnings Measure in effect for an Account
                   when installments begin is the Moody's Rate, or if the
                   Participant changes the Earnings Measure to the Moody's Rate
                   during the course of the installment period in accordance
                   with Section 5(e)(iii) above, the Participant may not
                   subsequently change the Earnings Measure.


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        In Witness Whereof, the Company has caused this Amendment to be signed
by its duly authorized officer this 30th day of June 1997.





                                             CABOT CORPORATION


                                             By: /s/ Karen M. Morrissey
                                                 -------------------------------

                                             Its:  Vice President
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