Document:

<PAGE>   1
                                                                    Exhibit 10.8

The omitted portions indicated by brackets have been separately filed with the
Securities and Exchange Commission pursuant to a request for confidential
treatment under Rule 406, promulgated under the Securities Act of 1933, as
amended.

                          DISPERSION SERVICES AGREEMENT

       This DISPERSION SERVICES AGREEMENT (the "Agreement"), executed this 20th
day of January, 2000, is between Cabot Corporation ("Cabot"), a Delaware
corporation, and Cabot Microelectronics Corporation ("CMC"), a Delaware
corporation. Notwithstanding the execution date hereof, this Agreement shall
become effective upon the date of the initial public offering by CMC of shares
of CMC common stock.

       WHEREAS, Cabot and certain of its subsidiaries and CMC will be parties to
a Master Separation Agreement, (the "Master Separation Agreement"), which will
provide for the separation from Cabot of the business, assets and liabilities of
Microelectronics Materials Division of Cabot (the "MMD Business") and the
transfer of the MMD Business to CMC;

       WHEREAS, in the past, the Microelectronics Materials Division of Cabot
has performed various dispersion services for Cabot;

       WHEREAS, Cabot desires to have CMC provide to Cabot certain dispersion
services after the separation of the MMD Business; and

       WHEREAS, CMC desires to provide such dispersion services to Cabot as
provided herein;

       NOW, THEREFORE, in consideration of the foregoing premises and other good
and valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties hereby agree as follows:

SECTION 1.        TERM

       This Agreement shall commence on the date of the initial public offering
by CMC of shares of CMC common stock, and shall continue until June 30, 2005
(the "Initial Term"). Unless either party shall give a notice of nonrenewal
prior to December 31, 2003, this Agreement shall continue after the Initial Term
until terminated by either party by a written notice of termination, which shall
terminate this Agreement effective on the first June 30 or December 31 more than
18 months after the date such notice is delivered. The Initial Term, together
with any continuations, are referred to herein as the "Term". Each year of the
Term beginning on the effective date or an anniversary thereof is referred to
herein as a "Term Year", including the stub period, if any, between the last
anniversary of the effective date and the end of the Term.

<PAGE>   2

SECTION 2.        SERVICES

      2.1   Purchase and Sale.

      (a) Subject to the terms and conditions of this Agreement, during the
Term, CMC shall provide to Cabot, and Cabot shall purchase from CMC, the
Services (as defined below) in such quantities as specified by Cabot, subject to
Sections 2.3 through 2.6 below. "Services" means:

      (i)   the manufacturing and packaging of the type of dispersions set forth
            on Schedule A hereto (the "Products") in accordance with the
            specifications, formulae and processes provided by Cabot to CMC and
            initially as set forth in the materials specified on Schedule A
            hereto;

      (ii)  the packaging of the Products in accordance with specifications set
            forth on Schedule A, which may be amended from time to time, by
            mutual agreement; and

      (iii) testing and other ancillary services as related thereto as may be
            mutually agreed between Cabot and CMC from time to time.

      (b) Any amendment to Schedule A shall require the consent of both CMC and
Cabot. Any increase in costs incurred by CMC in manufacturing and/or packaging
Products to comply with changes requested by Cabot to the specifications as set
forth on Schedule A shall be paid by Cabot.

      (c) With respect to Products to be sold to customers of Cabot and/or its
subsidiaries which are located in the United States, Canada or Mexico
(collectively "North America"), Services shall be performed either by (i) CMC at
its facility in Aurora, Illinois (the "Aurora Plant"), or (ii) Davies Imperial
Coatings ("Davies"), pursuant to an agreement between CMC and Davies (the
"Davies Agreement"); provided that CMC shall continue to remain primarily liable
to Cabot for any Services provided by Davies. Cabot and CMC shall confer in good
faith in order to determine whether Services will be provided by the Aurora
Plant or Davies.

      (d) With respect to Products to be sold to customers of Cabot and/or its
subsidiaries located in Europe, Services shall be performed at the dispersions
facility of CMC in Barry, Wales (the "Barry Plant").

      (e) With respect to Products to be sold to customers of Cabot and/or its
subsidiaries located in regions other than North America or Europe, CMC shall
determine

                                      -2-
<PAGE>   3

the appropriate facility to perform such Services after review of its regional
capacity and capabilities and after consultation with Cabot.

      (f) Notwithstanding anything to the contrary in subsections (c) and (d)
above, and subject to 2.3(a)(i), Cabot may specify Products to be manufactured
at the Aurora Plant, regardless of the ultimate geographic market for such
Products, provided that such Products would not be incompatible with the
dispersions manufacturing capabilities at the Aurora Plant or that such Products
would not create contamination issues with respect to the products CMC
manufactures at its Aurora Plant.

      2.2 Forecasts.

      Cabot shall provide CMC with forecasts (the "Forecasts") of the quantities
of Products that Cabot expects to purchase from CMC (the "Forecasted
Quantities"). The Forecasts shall identify the Forecasted Quantities of the
Products and the geographic locations for manufacture (i.e., the Aurora Plant,
Davies or the Barry Plant). Cabot shall provide the following Forecasts to CMC:

      (a) not more than sixty (60) but not less than thirty (30) days prior to
each January 1, April 1, July 1 and October 1 during the Term, a Forecast
indicating the Forecasted Quantity for each month of the calendar quarter
commencing on such January 1, April 1, July 1 and October 1 (the "Quarterly
Forecast");

      (b) not more than sixty (60) but not less than thirty (30) days prior to
on each July 1 and January 1 during the Term, a semi-annual Forecast indicating
the Forecasted Quantity for the six (6) month period commencing on such July 1
and January 1 (the "Six Month Forecast");

      (c) not more than sixty (60) but not less than thirty (30) days prior to
on each July 1, a one (1) year Forecast indicating the Forecasted Quantity for
the calendar year commencing on the following July 1 (the "Annual Forecast");
and

      (d) on or around each July 1, an eighteen (18) month Forecast indicating
the Forecasted Quantity for the eighteen month period commencing on the July 1
(the "18 Month Forecast"); provided, however, that Cabot shall provide CMC with
a revised eighteen (18) Month Forecast for the remainder of the eighteen (18)
month period covered by the last 18 Month Forecast as soon reasonably
practicable after Cabot becomes aware of any material changes to such 18 Month
Forecast.

        For the purposes of this Agreement, Forecasts delivered by Cabot to CMC
after the execution hereof shall, upon the effectiveness of this Agreement, be
deemed to have been delivered hereunder.

                                      -3-
<PAGE>   4

      2.3   CMC's Maximum Supply Obligations.

      (a) The obligation of CMC to provide Products to Cabot shall be subject to
each of the following maximum monthly volume limitations:

      (i)   the maximum monthly volume of Products from CMC's Aurora, Illinois
            facility (the "Aurora Plant") shall be [ ] gallons per month;

      (ii)  the maximum monthly volume of Products from Davies' Hammond, Indiana
            facility (the "Hammond Plant") shall be [ ] gallons per month; and

      (iii) the maximum monthly volume of Products from the Barry Plant shall be
            [ ] gallons per month.

      (b) In addition to the volume limitations set forth in 2.3(a) above, in
the event that Cabot orders volumes of Products from CMC in excess of Forecasted
Quantities, CMC shall not be obligated to supply to Cabot such Products in
excess of the following volumes:

      (i)   for any calendar quarter and any plant, [ ]% of the volumes for such
            plant set forth in Cabot's Quarterly Forecasts;

      (ii)  for any calendar half year (beginning on or after July 1, 2000) and
            any plant, [ ]% of the volumes for such plant set forth in Cabot's
            Sixth Month Forecast; and

      (iii) for any year beginning July 1 and any plant, [ ]% of the volumes for
            such plant set forth in Cabot's Annual Forecast.

       (c) The maximum supply volumes set forth in Sections 2.3 (a) and (b) are
referred to herein as the "Maximum Volumes". If Cabot shall order volumes of
Products in excess of the Maximum Volumes described above, CMC shall use
commercially reasonable efforts to supply such volumes ("Excess Volumes").

      (d) Notwithstanding anything to the contrary in subsections (a) or (b)
above, if CMC shall increase its production capacity at its current dispersions
plants or at newly acquired or constructed dispersions plants, Cabot and CMC
shall negotiate in good faith regarding additional dispersions capacity that may
be available to Cabot and the price for dispersions services related to such
additional capacity.

2.4         Minimum Order Volumes.

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<PAGE>   5

            Cabot agrees to order Products from CMC subject to the minimum batch
size requirements set forth on Schedule A hereto.

2.5      Exclusivity.

       (a) Except in connection with its [ ] businesses, and subject to other
existing obligations, during the Term Cabot will not contract with any third
party (other than Cabot affiliates, CMC, CMIC or Davies) for the provision of
contract or toll manufacturing services for the production of fumed metal oxide
dispersions.

      (b) Notwithstanding subsection (a) above or subsection (c) below:

      (i)   Cabot shall have right the during the Term to produce fumed metal
            oxide dispersions for sale, its own use or the sale or use of its
            subsidiaries;

      (ii)  if CMC or Davies is unable or unwilling to supply certain products
            or volumes in accordance with the terms hereof, or above the Maximum
            Volumes set forth in Section 2.3 hereof, Cabot shall have the right
            to have such products or additional volumes of dispersions
            manufactured for it by other parties;

      (iii) In the event Cabot requests a change to the specifications, formulae
            or processes set forth on Schedule A, which change is necessary in
            order to achieve a material performance difference in Cabot's end
            product, and CMC is not able or is unwilling to modify such Product,
            Cabot shall have the right to have such changed products
            manufactured for it by any other party; and

      (iv)  Cabot shall have the right to contract for and purchase from third
            parties fumed metal oxide dispersions that are produced with fumed
            metal oxides that are not supplied by Cabot.

       (c) If Cabot terminates this Agreement, Cabot shall, for a period of [ ]
following the date of such termination purchase fumed metal oxide dispersions
products and services only from CMC, Davies or third parties who are not engaged
in the production and/or marketing of CMP (chemical mechanical polishing)
consumables.

       (d) During the Term of this Agreement, CMC shall not knowingly, without
Cabot's prior written consent, directly or indirectly, (i) perform dispersions
services for any person or entity other than Cabot for use in the production of
any goods or products that compete with any Cabot products, or (ii) sell fumed
metal oxide dispersions products into applications, other than CMP applications,
which compete with any Cabot product.

                                      -5-
<PAGE>   6

      2.6   Supply of Raw Materials

      Cabot shall be responsible for the supply to CMC of the fumed metal oxide
particles necessary for the manufacture of the Products ordered by Cabot. Any
such volumes of fumed metal oxides shall not be deemed supplied pursuant to the
Fumed Metal Oxide Supply Agreement, of even date herewith. CMC shall be
responsible for the supply of all other materials necessary for the manufacture
of the Products, including packaging materials.

SECTION 3.        PRICING

      3.1 Prices. CMC shall perform the Services and sell the Products in
accordance with the following prices (the "Prices"):

      (a) with respect to Products manufactured and the services performed by
CMC, the price shall equal the "Dispersion Manufacturing Cost" incurred by CMC
plus 25% of such Dispersion Manufacturing Cost. As used herein, the "Dispersion
Manufacturing Cost" of fumed metal oxide dispersions shall mean, all costs that
may be included in Inventory (applying GAAP), excluding the cost of fumed metal
oxides provided by Cabot, plus freight and handling costs associated with the
fumed metal oxides. CMC's budgeted standard cost of production of fumed metal
oxides may be used for calculating such Dispersion Manufacturing Cost, provided
that both parties mutually agree that it fairly approximates the above stated
Dispersion Manufacturing Cost, and that both parties mutually agree upon a
method to make adjustments due to variances between the budgeted standard cost
and the actual Dispersion Manufacturing Cost.

      (b) with respect to Products manufactured and the services performed by
Davies, the price shall equal the Dispersion Manufacturing Cost incurred by CMC
(excluding the costs of the fumed metal oxide particle supplied by Cabot) plus
10% of such costs as an administrative charge.

      Cabot shall have the right to have a recognized accounting firm audit the
books and records of CMC necessary to verify the Dispersions Manufacturing Cost
provided above. Such accounting firm shall be obligated to keep any information
obtained during the audit of CMC's books and records confidential and may
confirm to Cabot only whether, and to what extent, CMC's calculations of the
Dispersions Manufacturing Cost deviate from the calculation of such accounting
firm.

      3.2 Cost Savings. Cabot and CMC acknowledge that it is their intention to
decrease the costs associated with manufacturing the Products, and to share any
cost savings resulting from joint efforts therefrom equally between them. Cabot
and CMC agree to discuss, from time to time, ways to jointly decrease such
costs.

                                      -6-
<PAGE>   7

SECTION 4.        SHIPPING, DELIVERY AND PAYMENT

      (a) Orders for Products shall be issued by Cabot from time to time. Each
order shall specify the date(s) the Products are to be delivered, which date(s)
shall be not less than ten (10) business days prior to the date the order is
received by CMC. For purposes of applying Section 2.3 only, each volume of
Product shall be deemed to be in the month specified for its shipment in Cabot's
order; and if no date is specified, then in the month following the month in
which the order therefor is issued by Cabot.

      (b) All sales of Products under this agreement are made F.O.B. CMC's point
of shipment. Cabot shall be responsible for all transportation costs and title
and risk of loss shall pass to Cabot upon delivery to carrier.

      (c) All Products shall be prepared by CMC for delivery to Cabot in
accordance with Cabot's reasonable instructions to be supplied by Cabot to CMC
as far in advance of, and not later than ten (10) business days prior to, a
requested shipment date.

      (d) CMC shall invoice Cabot for the Products delivered to Cabot during
each month by the fifteenth (15th) calendar day of the following month. CMC
shall deliver such invoices to Cabot by regular U.S. mail, or other methods such
as express U.S. mail, overnight courier or other means, if mutually acceptable.

      (e) Cabot shall pay each such invoice within fifteen (15) calendar days of
receipt thereof. Such payment shall be made by check or wire transfer in readily
available same day or next day funds denominated in United States dollars. If
payment is to be made by wire transfer, Cabot shall request and CMC shall
provide to Cabot, wire transfer instructions.

SECTION 5.        WARRANTIES

      5.1 Warranty as to Products. CMC represents and warrants to Cabot that,
when delivered to Cabot, the Products and Services will conform in all respects
to the specifications then in effect and as then set forth in the materials
specified on Schedule A hereto. CMC MAKES NO OTHER REPRESENTATION OR WARRANTY OF
ANY KIND, EXPRESS OR IMPLIED, AS TO MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE OR ANY OTHER MATTER WITH RESPECT TO THE PRODUCTS OR SERVICES, WHETHER
USED ALONE OR IN COMBINATION WITH OTHER SUBSTANCES, EVEN IF THE PURPOSES OR USES
OF SUCH PRODUCTS ARE KNOWN BY CMC.

      5.2 Remedies. If any Products do not conform in all respects to the
specifications then in effect and as then set forth on Schedule A hereto, CMC
agrees to replace such Products with Products that conform to such
specifications. Subject to the

                                      -7-
<PAGE>   8

following sentence, Cabot shall not be obligated to accept or pay for Products
not conforming to the specifications then in effect for such Products. If such
non-conformity is the result of materials or formulae provided by Cabot to CMC,
Cabot shall pay CMC for the Services and such volumes shall be included in
determining the volumes of Products delivered by CMC to Cabot hereunder. In no
event shall CMC be responsible or liable for any special, incidental or
consequential damages arising as a result of any breach of warranty in respect
of any PRODUCTS OR Services under this Agreement or the transactions
contemplated hereby.

SECTION 6.        RELATIONSHIP OF PARTIES

      (a) CMC and Cabot are each independent contractors. Nothing herein
contained shall be construed to place CMC and Cabot in the relationship of
principal and agent, master and servant, partners, or joint venturers, and,
except as otherwise set forth in this Agreement, neither party shall have,
expressly or by implication, the power to represent itself as having any
authority to make contracts in the name of or binding upon the other, or to
obligate or bind the other in any manner whatsoever.

      (b) Cabot recognizes and agrees that certain dispersions services shall be
performed on CMC's behalf by Davies. However, such services by Davies shall be
considered to have been subcontracted by CMC to Davies, and ultimate
responsibility for the performance of such services shall remain with CMC. Cabot
shall have no direct contractual relationship with Davies with respect to
dispersion services obtained by CMC pursuant to this Agreement.

SECTION 7.        INTELLECTUAL PROPERTY AND CONFIDENTIALITTY

      (a) Any intellectual property relating to the process engineering or
method of production of dispersions ("Dispersions Intellectual Property")
developed by CMC or CMIC principally in the course of performing Services for
Cabot hereunder shall be jointly owned by Cabot and either CMC or CMIC, as the
case may be. Notwithstanding the above, Cabot shall not sublicense or assign
such intellectual property to any party (other than a subsidiary or affiliate of
Cabot) for use in the production and/or sale of CMP consumables. Similarly, CMC
shall not sublicense or assign such intellectual property to any party (other
than a subsidiary or affiliate of CMC) for use in the production and/or sale of
products for use in non-CMP applications.

      (b) CMC or CMIC shall, upon the request of Cabot, grant a non-exclusive
license to Cabot, in exchange for a commercially reasonable royalty payment from
Cabot to CMC or CMIC, as the case may be, to be mutually agreed between the
appropriate parties, any Dispersions Intellectual Property developed by CMC or
CMIC other than in the performance of Services but which is used by CMC or CMIC
in the production of

                                      -8-
<PAGE>   9

Products. Notwithstanding the above, Cabot shall not sublicense or assign such
intellectual property to any party (other than a subsidiary or affiliate of
Cabot) for use in the production and/or sale of CMP consumables.

      (c) CMC and CMIC shall use their commercially reasonable best efforts,
including by seeking to have included in the Davies Agreement appropriate
provisions, to have Davies bound by the provisions of subsections (a) and (b)
above to the same extent as CMC and CMIC.

      (d) Each of Cabot and CMC agree to keep confidential and not disclose, and
shall cause their respective subsidiaries and affiliates to keep confidential
and not disclose, to any party or use for any purpose (other than the
performance of this Agreement), any proprietary or other confidential
information of the other party which is received pursuant to this Agreement
("Confidential Information"). Confidential Information shall be subject to the
restrictions of this paragraph only if it is marked as confidential or
proprietary or, if not disclosed in tangible form, the disclosing party notifies
the recipient of its confidential or proprietary nature prior to its disclosure.
For purposes of this Agreement, Confidential Information of a party does not
include, and a party and a party's subsidiaries and affiliates will have no
obligations under this provision with respect to, any information of the other
party or any subsidiary or affiliate of the other party (the other party and
subsidiaries and affiliates of the other party being referred to as the
"receiving party") which:

      (i)   is already known to the receiving party from a source other than the
disclosing party as evidenced by competent proof thereof; or

      (ii)  is or becomes publicly known through no wrongful act of the
receiving party (in which event the receiving party's obligations under this
Agreement in respect thereto shall terminate on the date such information enters
the public domain); or

      (iii) is rightfully received by the receiving party from a third party
without violation of any obligations of confidentiality owed by the third party
to the disclosing party; or

      (iv) is disclosed by the disclosing party to a third party without
restrictions on the third party's right to use or disclose such information; or

      (v) is independently developed by employees or consultants of the
receiving party without use of or reference to the disclosing party's
Confidential Information; or

      (vi) is approved for release by written authorization of the disclosing
party

SECTION 8.        CONSENTS; NOTICES

      Unless otherwise set forth herein, whenever any notice, consent or
approval is to be given in this Agreement, it must be in writing and delivered
in accordance with the

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<PAGE>   10

provisions of this Section 8. Any such writing will be duly given upon delivery,
if delivered by hand, facsimile transmission or mail, to the following
addresses:

      If to Cabot:            Cabot Corporation
                              Business and Technical Center
                              Billerica, MA  01821
                              Attn: Fumed Metal Oxide Product Line Manager
                              Telecopier:

                        With a copy to:

                              Cabot Corporation
                              75 State Street
                              Boston, MA  02109
                              Attn: Law Department
                              Telecopier:  617-342-6039

      If to CMC:              Cabot Microelectronics Corporation
                              870 North Commons Drive
                              Aurora, IL  60504
                              Attn:  Global Manufacturing Manager
                              Telecopier:  630-375-5596

or to such other address as may be designated in writing by any of the parties
from time to time in accordance herewith.

SECTION 9.        GENERAL

      9.1 Severability. If any provision of this Agreement shall be found to be
invalid or unenforceable, then such provision or provisions shall not invalidate
or in any way affect the enforceability of the remainder of this Agreement and
such provision or provisions shall be curtailed and limited to the extent
necessary to bring the Agreement within any legal requirement and the parties
shall negotiate in good faith with respect to an equitable modification of the
provision or application thereof held to be invalid.

      9.2 Modification; Waivers. Except as expressly provided herein, this
Agreement may be modified or amended only with the written consent of each party
hereto. Neither party hereto shall be released from its obligations hereunder
without the written consent of the other party. The observance of any term of
this Agreement may be waived (either generally or in a particular instance and
either retroactively or prospectively) by the party entitled to enforce such
term, but any such waiver shall be

                                      -10-
<PAGE>   11

effective only if in a writing signed by the party against which such waiver is
to be asserted. Except as otherwise specifically provided herein, no delay on
the part of either party hereto in exercising any right, power or privilege
hereunder shall operate as a waiver thereof, nor shall any waiver on the part of
either party hereto of any right, power or privilege hereunder operate as a
waiver of any other right, power or privilege hereunder nor shall any single or
partial exercise of any right, power or privilege hereunder preclude any other
or further exercise thereof or the exercise of any other right, power or
privilege hereunder.

      9.3 Succession. This Agreement shall be binding upon and shall inure to
the benefit of the parties hereto and their respective successors and other
legal representatives and, to the extent that any assignment hereof is permitted
hereunder, their assignees.

      9.4 Counterparts. This Agreement may be executed in counterparts.

      9.5 Further Assurances. Each party agrees to provide any additional
documents and take any such further action as may be reasonably requested by the
other party in order to carry out the purpose and intent of this Agreement.

      9.6 Entire Agreement. This Agreement contains the full and complete
undertaking and agreement between the parties hereto with respect to the
manufacture and supply of fumed metal oxide dispersions, and supersedes all
other agreements between Cabot, on the one hand, and CMC, on the other, whether
written or oral except any confidentiality agreements between the parties, which
shall, to the extent such agreements do not contradict the terms of this
Agreement, continue in effect.

      9.7 Headings. The headings of the sections and other subdivisions of this
Agreement are for convenient reference only. They shall not be used in any way
to govern, limit, modify, construe this Agreement or any part or provision
thereof nor otherwise be given any legal effect.

      9.8 Assignees and Third Parties. This Agreement may not be assigned by
either party without the prior written consent of the other party and any
attempted assignment without such consent shall be null and void; provided,
however, that Cabot may assign this Agreement to a subsidiary or affiliated
company. In addition, CMC may make arrangements for the production and sale of
Services and Products required hereunder to be manufactured and sold by a
subsidiary or an affiliate, including but not limited to Cabot Microelectronics
International Corporation. Such arrangements may take the form of an assignment
of certain rights and obligations hereunder or a subcontract of certain
obligations hereunder. Similarly, Cabot may make arrangements for the purchase
of Products and Services hereunder to be made by a subsidiary, including but not
limited to Cabot Carbon Ltd. Such arrangements may take the form of an
assignment of certain

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<PAGE>   12
rights and obligations hereunder. However, all sales of Products and Services
pursuant to any such arrangement shall be governed by the terms of this
Agreement.

      9.9 Governing Law. This Agreement shall be governed by and construed and
enforced in accordance with the laws of Delaware, without giving effect to
principles of conflicts or choice of laws of Delaware or of any other
jurisdiction.

      9.10 Force Majeure. Each of the parties hereto shall be excused from
delays in performing or from failure to perform hereunder to the extent that
such delays or failures result from causes beyond the reasonable control of such
party, including, but not limited to, forces of nature, acts of God, strikes,
lockouts, wars, blockades, insurrections, riots, epidemics, restraints or
requirements of any government or government agency, civil disturbances,
explosions, breakage or accident to machinery or lines of pipe, unavailability
of raw material or supplies, strandings, perils of the sea, the binding order of
any court or governmental authority which has been resisted in good faith by all
reasonable means, and other cause, whether of the kind enumerated or otherwise,
not reasonably within the control of the party claiming suspension. Failure to
prevent or settle any strike shall not be considered to be a matter within the
control of the party claiming suspension. However, in order to be excused from
delay or failure to perform, such party must act diligently to remedy the cause
of such delay or failure.

                                      -12-
<PAGE>   13

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement as a
sealed instrument and have delivered this Agreement as of the day and year first
above written.

                                     CABOT CORPORATION

                                     By: /s/  Samuel W. Bodman
                                        ------------------------------------
                                         Name:  Samuel W. Bodman
                                         Title: Chief Executive Officer

                                     CABOT MICROLELECTRONICS
                                     CORPORATION

                                     By: /s/ Matthew Neville
                                        ------------------------------------
                                        Name:  Matthew Neville
                                        Title: President and
                                               Chief Executive Officer

                                      -13-
<PAGE>   14

                                  SCHEDULE A
                                North America
           Products, Materials Specifying Specifications, Formulae,
                   Processes, Quality Control, Maintenance
<TABLE>
<CAPTION>

   PRODUCT       FORMULA       CONTROL PLAN         SPECIFICATION              CMC TEST          STANDARD      MINIMUM
                (REVISION       (EFFECTIVE       (SPECIFICATION NO./            METHODS           PACKAGE       ORDER
                  DATE)        DATE/REVISION        REVISION DATE)           (TEST METHOD                     QUANTITY
                                  LEVEL)                                       NUMBER)
<S>              <C>          <C>                <C>                      <C>                   <C>           <C>
     [ ]         9/19/96      8-5-96, Rev. A       [ ] -10/98-Rev.        101, 200, 300, 302     55 G Poly     8 Drums
                                                       1-10/98                                     Drum
     [ ]         1/19/00      5-1-97, Rev. A        [ ] -1/0-Rev.           203, 6010A (1)      275 G Rock     2 Totes
                                                        3-1/00                                     Tote
     [ ]          5/4/95      10-1-97, Rev. A       [ ] -4/98-Rev.        101, 200, 300, 302    55 G Fiber     8 Drums
                                                        1-5/97                                     Drum
     [ ]          7/5/94      8-5-96, Rev. A        [ ] -4/98-Rev.        101, 200, 300, 302    55 G Fiber     8 Drums
                                                        1-5/97                                     Drum
     [ ]          2/1/93      10-1-97, Rev. A       [ ] -4/98-Rev.        101, 200, 300, 302    55 G Fiber     5 Drums
                                                        1-5/97                                     Drum
     [ ]          7/5/93      10-1-97, Rev. A       [ ] -4/98-Rev.        101, 200, 300, 302    55 G Fiber     5 Drums
                                                        1-5/97                                     Drum
     [ ]          7/6/94      10-1-97, Rev. A       [ ] -4/98-Rev.        101, 200, 300, 302    55 G Fiber     4 Drums
                                                        1-5/97                                     Drum
     [ ]         7/16/93      10-1-97, Rev. A       [ ] -4/98-Rev.        101, 200, 300, 302    55 G Fiber     6 Drums
                                                        1-5/97                                     Drum
     [ ]         9/27/94      10-1-97, Rev. A       [ ] -4/98-Rev.        101, 200, 300, 302    55 G Fiber     5 Drums
                                                        1-5/97                                     Drum
     [ ]         11/18/93     10-1-97, Rev. A       [ ] -4/98-Rev.        101, 200, 300, 302    55 G Poly     8 Drums
                                                        1-5/97                                     Drum
     [ ]         8/23/96      10-1-97, Rev. A       [ ]-4/98-Rev.1-5/97   101, 200, 300, 302    55 G Poly     6 Drums
                                                                                                    Drum
</TABLE>

                                      -14-
<PAGE>   15

<TABLE>
<CAPTION>

<S>             <C>          <C>                   <C>                     <C>                       <C>               <C>
     [ ]         9/19/96      8-5-96, Rev. A       [ ] -4/98-Rev.           101, 200, 300, 302         55 G Fiber        8 Drums
                                                        1-4/98                                           Drum
     [ ]         9/19/96      8-5-96, Rev. A       [ ] -4/98-Rev.           101, 200, 300, 302         55 G Fiber        6 Drums
                                                        1-4/98                                           Drum
     [ ]          6/9/98      6-9-98, Rev. B       [ ] -6/98-Rev. B         400, 404, 408              55 G Poly         5 Drums
                                                         6/98                                            Drum
     [ ]         8/31/99      8-31-96, Rev. A      [ ] -8/99-Rev. A         DTM 101, 201,              55 G Poly         6 Drums
                                                         8/99               302, 303, 500, 607           Drum
     [ ]         1/19/00      1-19-00, Rev. B      [ ] -1/00-Rev. 1         203, 6010A (1)            275 G Rock        2800 LBS
                                                                                                           Tote
</TABLE>

                                      -15-
<PAGE>   16

                                  SCHEDULE A
                                    Europe
           Products, Materials Specifying Specifications, Formulae,
                   Processes, Quality Control, Maintenance

<TABLE>
<CAPTION>

  PRODUCT      FORMULA        CONTROL PLAN              SPECIFICATION         CMC TEST                 STANDARD     MINIMUM ORDER
              (REVISION        (EFFECTIVE           (SPECIFICATION NO./       METHODS                  PACKAGE        QUANTITY
                DATE)            DATE/REVISION          REVISION DATE)        (TEST METHOD
                                     LEVEL)                                     NUMBER)

<S>        <C>                <C>                   <C>                       <C>                    <C>            <C>
    [ ]        (US-[ ])        10-1-97 Rev. A          [ ] -4/98-Rev.         CTM 400, 407, 404       220 liter       1000 Kgs
                5/4/95                                      1-5/97                                    Poly Drum
    [ ]       D1.701.013       D1.701.013 Rev. 3       D1.701.013 Rev 3       CTM 400, 407, 405       220 liter       1062 Kgs
            Rev 3 23/12/99          23/12/99               23/12/99                                   Poly Drum
    [ ]       D1.701.003       D1.701.003 Rev. 2       D1.701.003 Rev.2       CTM 400, 407, 406       220 liter       1062 Kgs
            Rev.2 15/12/99          15/12/99               15/12/99                                   Poly Drum
    [ ]       D1.701.005       D1.701.005 Rev. 3       D1.701.005 Rev 3       CTM 400, 407, 407       220 liter       1090 Kgs
            Rev 3 16/12/99          16/12/99               16/12/99                                   Poly Drum
    [ ]       D1.701.024       D1.701.024 Rev. 2       D1.701.024 Rev. 2      CTM 400, 407, 411       220 liter       1028 Kgs
                Rev. 2              16/12/99               16/12/99                                   Poly Drum
               16/12/99
    [ ]       (US-A1695)       10-1-97 Rev. A          A1695-4/98-Rev.        CTM 400, 407, 413       220 liter       1000 Kgs
                7/5/93                                      1-5/97                                    Poly Drum
    [ ]       D1.701.036       D1.701.036 Rev. 2       D1.701.036 Rev. 2      CTM 400, 407, 416       220 liter       1088 Kgs
            Rev.2 23/12/99          23/12/99               23/12/99                                   Poly Drum
    [ ]       D1.701.037       D1.701.037 Rev. 2       D1.701.037 Rev. 2      CTM 400, 407, 417       220 liter       1088 Kgs
                Rev. 2              06/01/00               06/01/00                                   Poly Drum
               06/01/00
    [ ]       D1.701.038       D1.701.038 Rev. 2       D1.701.038 Rev. 2      CTM 400, 407, 418       220 liter       1460 Kgs
                Rev. 2              06/01/00               06/01/00                                   Poly Drum
               06/01/00
    [ ]       D1.701.040       D1.701.040 Rev, 3       D1.701.040 Rev. 3      CTM 400, 407, 420       220 liter       1090 Kgs
                Rev. 3              15/12/99               15/12/99                                   Poly Drum
               15/12/99
    [ ]       D1.701.002       D1.701.002 Rev. 2       D1.701.002 Rev. 2      CTM 400, 407, 424       220 liter       1240 Kgs
            Rev. 2 05/01/00         05/01/00               05/01/00                                   Poly Drum
</TABLE>

                                      -16-
<PAGE>   17

<TABLE>
<CAPTION>

<S>           <C>              <C>                     <C>                   <C>                     <C>             <C>
    [ ]       D1.701.017       D1.701.017 Rev. 2       D1.701.017 Rev. 2      CTM 400, 407, 425       220 liter        988 Kgs
                Rev. 2              15/12/99               15/12/99                                   Poly Drum
               15/12/99
    [ ]       D1.701.033       D1.701.033 Rev. 2       D1.701.033 Rev. 2      CTM 400, 407, 426       220 liter       1070 Kgs
                Rev. 2              08/12/99               08/12/99                                   Poly Drum
               08/12/99
</TABLE>

                                      -18-<PAGE>   1
                                                                   Exhibit 10.11

The omitted portions indicated by brackets have been separately filed with the
Securities and Exchange Commission pursuant to a request for confidential
treatment under Rule 406, promulgated under the Securities Act of 1933, as
amended.

             INTEL CORPORATION PURCHASE AGREEMENT - CHEMICALS/GASES

                                                   Agreement #:          C-06438
                                                   Effective Date: FEB. 18, 1999
                                                  Expiration Date:  DEC. 31,2001
                                                     CNDA #:               17452

BUYER:      Intel Corporation (and all Intel divisions and subsidiaries,
            hereinafter "BUYER" or "INTEL")
            Intel Corporation
            2200 Mission College Blvd
            Santa Clara, CA 95052-8119

SUPPLIER:   Cabot Corporation (hereinafter "SUPPLIER")
            500 Commons Drive
            Aurora, IL 60504

<TABLE>
<S>                                     <C>       <C>
                                        X         Terms and Conditions of Purchase Agreement - Goods
Addenda attached here to and            X    A    Product Description and Price Schedule
Incorporated herein by reference        X    B    Key Contacts & Intel Fab Locations
(Mark "X" where applicable.)            X    C    Quality Requirements
                                        X    D    Volume Commitments
                                             E
                                             F
</TABLE>

Buyer will purchase and Supplier will sell certain Items in accordance with the
Terms and Conditions and Addenda attached hereto. All Purchase Orders issued to
Supplier by Buyer during the term of this Agreement shall be governed only by
the Terms and Conditions of this Agreement notwithstanding any preprinted terms
and conditions on Supplier's acknowledgment or Buyer's Purchase Order. Any
additional or different terms in documents exchanged by the parties subsequent
to execution of this agreement are hereby deemed to be material alterations and
notice of objection to and rejection of them is hereby given.

INTEL CORPORATION                                 SUPPLIER

By: /s/  Mumtaz Ahmed                             By: /s/  Matthew Neville
    --------------------------                        --------------------------
Signature                                         Signature

Mumtaz Ahmed                                      Matthew Neville
Printed Name                                      Printed Name

Commodity Manager                                 GM & VP
Title                                             Title

2/18/99                                           2/18/99
Date                                              Date

<PAGE>   2

          TERMS AND CONDITIONS OF PURCHASE AGREEMENT - CHEMICALS/GASES

1.   DEFINITIONS

A.   "Release" means Buyer's authorization to ship in accordance with the
     Buyer's Purchase Order, and authorizing Supplier to ship a definite
     quantity of Items to a specified schedule. The Release is contained in the
     Purchase Order sent to Supplier.

B.   "Items" means the goods which Supplier is to provide to Buyer as set forth
     on Addendum A. Any Item which is custom made for Buyer shall be indicated
     by an asterisk (*) on such Addenda A.

C.   "Estimated Usage" or "Forecast" is the quantity Buyer reasonably expects to
     Release, however, Buyer shall not be obligated to Release such quantities
     of Items.

D.   "Purchase Order" is Buyer's document setting forth specific line Items
     ordered and Release information.

E.   "CIF" means "Cost, Insurance and Freight (named port of shipment)."
     Reference Incoterms 1990.

F.   "DDP" means "Delivered Duty Paid (named place of destination)." Reference
     Incoterms 1990.

G.   "DDU" means "Delivered Duty Unpaid (named place of destination)." Reference
     Incoterms 1990.

H.   "FMO" is Fab Materials Operation (a department within Intel Corporation).

I.   "FOB" means "Freight on Board (named port of shipment)." Reference
     Incoterms 1990.

J.   "FCA" means "Free Carrier (named place of destination)". Reference
     Incoterms 1990.

2.   TERM OF AGREEMENT

A.   The term of this Agreement shall begin on the Effective Date and continue
     to the Expiration Date, unless renewed pursuant to the terms of this
     Section. After the initial term, this Agreement shall be automatically
     renewed from year to year (for one-year periods) without action by either
     party, unless terminated pursuant to Section 5 of this Agreement. At
     Buyer's option, Items may be scheduled for delivery up to three (3) months
     following expiration or termination of this Agreement.

B.   This Agreement shall be effective to all Intel manufacturing facilities in
     the U.S. and the non-U.S. facilities identified in Addenda hereto.

3.   PRICING

A.   Prices of Items are as set forth in Addendum A, and may only be modified by
     mutual agreement. Supplier will publish newly negotiated prices to
     corporate representative and all Site buyers within 10 days of signed
     agreement.

B.   For any Item of which Supplier supplied Buyer with [ ]% or more of Buyer's
     requirements, as described in Addendum D, during the previous calendar
     year, Supplier agrees that the price for such Item shall always be
     Supplier's lowest net price charged any customer for like volumes of such
     Item. If the net price charged to Buyer for such is greater than that
     charged to another customer of Supplier for like volumes, Supplier shall
     adjust its price to Buyer to the lower price for as long as Supplier
     continues to offer such lower price to another customer. In addition, to
     the extent Buyer was charged a higher price during a period that Supplier
     was selling like volumes of such Item to another customer at a lower price,
     Supplier shall refund to Buyer the difference in the purchase price paid by
     Buyer and such lower price.

C.   In the event Supplier offers any Item of which Supplier supplied Buyer with
     [ ]% or more of Buyer's requirements as described in Addendum D during the
     previous calendar year at a lower price (taking into account volume
     discounts) either as a general price drop or only to some customer(s) for
     any reason, Supplier shall immediately inform Buyer of this price.

                                      -2-
<PAGE>   3

D.   Applicable taxes and other charges such as duties, customs, tariffs,
     imposts and government imposed surcharges, and freight shall be stated
     separately on Supplier's invoice.

E.   Additional costs, except those described in Section 3(D) or in Addenda A or
     D, will not be reimbursed without Buyer's prior written approval.

F.   Buyer reserves the right to have Supplier's records inspected and audited
     only by an independent third party auditor to ensure compliance with
     section 3B of this Agreement. At Buyer's option or upon Supplier's written
     demand, such audit will be performed by an independent third party at
     Buyer's expense. However, if Supplier is found to not be complying with
     section 3B of this Agreement in any way, Supplier shall reimburse Buyer for
     all costs associated with the audit. The results of such audit shall be
     kept confidential by the auditor, and only Supplier's failures to abide by
     the obligations of this Agreement shall be reported to Buyer.

G.   If a new product not included in Addendum A is to be purchased regularly,
     its price will be negotiated by a corporate representative at the time of
     initial purchase. If the product is for test purposes only at a given site,
     its price may be established between Supplier and a Sitebuyer. Said price
     shall be in effect until such time as an Intel part number is created, at
     which time a corporate-wide price will be negotiated by a corporate
     representative.

H.   Supplier will publish quarterly updates of Addendum A to FMO, all Buyer's
     Site Chemicals buyers and Buyer's Accounts Payable department, including
     new chemicals, their negotiated prices, supplier part numbers, Intel part
     numbers and any other changes. Quarterly updates of Addendum A will be
     issued on 1/30, 4/30, 7/30 and 10/30 of each year. Names and addresses of
     all parties to receive the updates will be provided and updated by Site
     buyer (see Addendum B).

I.   U.S. and non-U.S. prices will be fixed in U.S. dollars regardless of the
     Item country of origin or destination. Buyer retains the right to buy from
     Supplier or any subsidiaries of Supplier in U.S. dollars.

J.   The cost of containers, both returnable and disposable, diptubes and any
     required accessories will be included in the cost of the chemical

K.   Warehousing costs will be separate from this Agreement and will be billed
     separately.

4.   INVOICING AND PAYMENT

A.   Any applicable prompt payment discounts will be computed from the latest
     of: (i) the scheduled delivery date; (ii) the date of actual delivery; or
     (iii) the date a properly filled out original invoice or packing list is
     received. Payment is made when Buyer's check is mailed or EDI funds
     transfer initiated. Buyer shall make payment within forty-five (45) days of
     receipt of the proper original invoice or packing list.

B.   Original invoices or packing lists shall be submitted and shall include:
     full legal company name, payment terms, freight terms, tax status and rate,
     purchase agreement number from the Purchase Order, purchase order number,
     line Item number, Release number, part number, complete bill to address,
     description of Items, quantities, unit price and extended totals. Buyer's
     payment shall not constitute acceptance. Invoice must match Buyer's PO and
     packing slip exactly including unit of measure.

C.   Supplier shall provide to Buyer's Accounts Payable, and update as
     necessary, the names and phone numbers of a contact in Accounts Receivable.

D.   All international shipments must be accompanied by original invoice.

E.   Supplier will invoice Buyer for material and services no later than 120
     days after delivery.

5.   TERMINATION

     This Agreement may not be terminated by either party prior to the
     Expiration Date, except upon material breach by the other party. The
     Agreement may be terminated by

                                      -3-
<PAGE>   4

     either party on or after the Expiration Date by delivering to the other
     party written notice of termination at least one year prior to the date of
     such termination.

6.   CONTINGENCIES

     Neither party shall be responsible for its failure to perform due to causes
     beyond its reasonable control such as acts of God, fire, theft, war, riot,
     embargoes or acts of civil or military authorities. If delivery is to be
     delayed by such contingencies, Supplier shall immediately notify Buyer in
     writing and Buyer may either: (i) extend time of performance; or (ii)
     terminate all or part of the uncompleted portion of the Purchase Order at
     no cost to Buyer.

7.   DELIVERY, RELEASES AND SCHEDULING

A.   Any Forecasts provided by Buyer are for planning purposes only and do not
     constitute a Release or other commitment by Buyer.

B.   [Left intentionally blank]

C.   Supplier shall notify Buyer in writing within two (2) business days of
     receipt of Buyer's Purchase Order if Supplier is unable to make any
     scheduled delivery and state the reasons therefor. The absence of such
     notice constitutes acceptance of the Purchase Order and commitment to the
     Release terms.

D.   Supplier shall not deliver Items earlier than five (5) business days prior
     to agreed scheduled delivery dates and Buyer may return early, excess, or
     non-conforming shipments at Supplier's risk and expense.

E.   Buyer may reschedule or cancel any Release in whole or in part prior to the
     Release date at no additional charge.

F.   Buyer may place any portion of a Release on hold by notice which shall take
     effect immediately upon receipt. Releases placed on hold will be
     rescheduled or canceled within a reasonable time.

G.   Supplier shall not deliver Items until such Items are specified in an
     issued Purchase Order which contains specific Release dates for specific
     Items.

H.   Purchase orders will specify the destination date at Buyer dock or
     designated warehouse.

I.   Supplier must notify FMO, Accounts Payable and all Site Chemical buyers
     immediately in writing of any changes, including changes in delivery
     schedules, part numbers, contact persons and the party to be invoiced.

J.   Supplier must provide FMO with a Certificate of Analysis (C of A) or sample
     for each lot to be shipped, as directed in the most current appropriate
     Intel Specification (Addendum C).

K.   Buyer may return any standard Item in same condition as received within [ ]
     days of receipt. Buyer will pay return freight and disposal costs, if
     necessary (Disposal costs paid only if the product conformed to all
     required specifications in place). Reimbursement for Items returned will be
     made by credit memo.

L.   Supplier shall ship all Items according to the delivery address provided on
     each Purchase Order submitted by Buyer.

M.   Supplier shall provide and update as necessary the name and phone number of
     one person which Buyer's representative may contact regarding scheduling
     and delivery. Additionally, Supplier will provide 24-hour hotline/contact
     number which Buyer may contact in case of emergency.

N.   Supplier agrees to maintain safety stock on specified Items as mutually
     agreed with Buyer's local sites. Supplier shall notify Buyer whenever
     safety stock falls below minimum levels and will provide a corrective
     action plan to replenish Items. In the event Buyer no longer intends to
     purchase a particular Item from Supplier for use at a particular site,
     Buyer shall so notify Supplier of such fact and Buyer shall purchase
     Buyer's minimum required safety stock of such Items at that site.

                                      -4-
<PAGE>   5

O.   Supplier shall maintain an on-hand supply of emergency packaging material
     sufficient to meet pre-agreed requirements with Buyer's Site Chemical
     buyer.

8.   ACCEPTANCE AND WARRANTY

A.   Buyer may with reasonable advance notification inspect and test all Items
     at reasonable times before, during and after manufacture. If any inspection
     or test is made on Supplier's premises, Supplier shall provide reasonable
     facilities and assistance for the safety and convenience of Buyer's
     inspectors in such manner as shall not unreasonably hinder or delay
     Supplier's performance. All Items shall be received subject to Buyer's
     inspection, testing, approval and acceptance at Buyer's premises
     notwithstanding any inspection or testing at Supplier's premises or any
     prior payment for such Items. Items rejected by Buyer as not conforming to
     this Agreement or Item specifications whether provided by Buyer or
     furnished with the Item may be returned to Supplier at Supplier's risk and
     expense and, at Buyer's request shall immediately be repaired or replaced.

B.   Supplier warrants that all Items furnished here under shall be new, of the
     grade and quality specified, conform to all agreed-to specifications, and
     will be free of liens and encumbrances (excluding claims of intellectual
     property infringement, which are the exclusive subject of Section 14).
     These warranties shall survive any delivery, inspection, acceptance,
     payment or resale of the Items. Original specifications and any subsequent
     modifications to those specifications shall be agreed upon by both Buyer
     and Supplier. SUPPLIER MAKES NO OTHER REPRESENTATION OR WARRANTY OF ANY
     KIND, EXPRESS OR IMPLIED, AS TO MERCHANTABILITY, FITNESS FOR A PARTICULAR
     PURPOSE OR ANY OTHER MATTER WITH RESPECT TO THE ITEMS, WHETHER USED ALONE
     OR IN COMBINATION WITH OTHER SUBSTANCES, EVEN IF THE PURPOSES OR USES OF
     SUCH PRODUCTS ARE KNOWN BY SUPPLIER.

C.   During the Items' specified shelf life, at Buyer's option, Supplier shall
     promptly repair, replace or refund the purchase price of all Items not
     conforming to the foregoing warranties, and shall also refund the cost of
     return shipping of such Items. Supplier will bear the risk of loss of such
     Items while in transit. Supplier's warranty liability for damages arising
     from each "Non-Conformance Event" shall [ ]. Furthermore, in no event shall
     Supplier's [ ]. As used herein, "Non-Conformance Event" shall mean the
     receipt by Buyer of a lot of Items which are not in conformity with the
     warranty given in Section 8B above. IN NO EVENT SHALL SELLER BE RESPONSIBLE
     OR LIABLE FOR ANY SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN
     WARRANTY UNDER THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY. The
     [ ]contained in this Section 8 is separate and independent from the [ ]
     contained in Section 14, and the amount of liability imposed under one of
     these Sections does not limit or restrict the amount of liability imposed
     under another Section. NOTHING IN THIS SECTION IS INTENDED TO PLACE A
     LIMITATION ON EITHER PARTY'S LIABILITY IN TORT FOR PERSONAL INJURY.

D.   Freight charges for returned non-conforming Items shall be paid by Supplier
     with the understanding that returns must be authorized in accordance with
     Supplier's return authorization procedures. Returns must be authorized by
     Supplier within 10 days of Buyer's request. Credit for returned Items will
     be issued within 30 days of notification by Buyer.

E.   Notwithstanding anything to the contrary contained in this Agreement,
     Supplier represents and warrants to Buyer that there will be no disruption
     in the supply of those goods and/or services which are under the direct
     control of the Supplier as a result of or due to the date change from and
     between December, 1999, and January, 2000, nor due to the year 2000 being a
     leap year. Supplier does not provide any such warranty for disruptions
     caused by those goods and/or services which are not under the Supplier's
     direct control. As used herein, "direct control" refers to goods and/or
     services which the Supplier actively manages by contract and/or owns.
     Furthermore, in no event shall

                                      -5-
<PAGE>   6

     Seller's total and aggregate liability under such warranty exceed $500,000
     over the term of this Agreement

9.   PRODUCT SPECIFICATIONS/IDENTIFICATION/ ERRATA

A.   Supplier shall not modify the specifications for Items without Buyer's
     written consent. Supplier shall notify FMO and all Site Chemical buyers
     immediately in writing of any change in Supplier's part number, in the
     manufacturing process, packaging or description for any Item sold to Buyer
     at least ninety (90) days in advance of any changes. Such notice shall also
     be included in the quarterly update mentioned in Section 3 (I).

B.   Supplier shall cooperate with Buyer to provide configuration control and
     traceability systems for Items supplied hereunder.

C.   Items must comply with Buyer's raw material specifications (Intel
     Specification 07-400).

D.   As long as Buyer is purchasing a particular Item, Supplier shall notify FMO
     and all Site Chemical buyers at least one year in advance of expected
     discontinuance of that Item. Exception: In the event of changes or
     discontinuation required by governmental order or requirement, Supplier
     shall notify Buyer in writing immediately. Notification of any change in
     product specification must follow Intel's " Materials Change Control
     Procedure." (Intel Specification 07-120).

E.   Where an existing agreed-to Intel Specification (Addendum C) is updated,
     the updated Specification must be agreed to by Buyer and Supplier before it
     will be in effect.

10.  CONTAINERS AND DIPTUBES

A.   All necessary chemical containers, packaging and diptubes will be provided
     by Supplier and included in the cost of the Item.

B.   All containers and diptubes shall be inspected by Supplier before each use
     and repaired or replaced as necessary.

C.   At all times, ownership and title of containers and diptubes will remain
     with the Supplier.

D.   Buyer will not be responsible for any additional charges for acquisition,
     termination or disposal of containers or diptubes.

E.   In the event that containers or diptubes become damaged through neglect or
     misuse by Buyer, Buyer will reimburse Supplier an amount agreed upon and
     pro-rated based upon useful life.

F.   All packaging including quartz, stainless steel, bottles, drums and ICBs,
     shall be equipped with tamper evident seals.

11   PACKING AND SHIPMENT

A.   Shipments to Israel: Delivery terms for Israel will be DDP Intel,
     Jerusalem. Supplier fulfills its obligation to deliver when Items are made
     available at Buyer's dock or designated warehouse. Supplier will bear all
     risks, liabilities and costs involved in bringing the Items thereto. Buyer
     will ship empty containers to the point of manufacture in a timely manner.

B.   Shipments to Ireland: Delivery terms for Ireland will be DDU Intel,
     Leixlip. Supplier fulfills its obligation to deliver when Items are made
     available at Buyer's dock or designated warehouse. Supplier will bear all
     risks, liabilities and costs involved in bringing the Items thereto,
     excluding duties, taxes and other official charges payable upon
     importation. Buyer will ship empty containers to the point of manufacture
     in a timely manner.

C.   For all other Intel Factories, both U.S. and non-U.S., Items shall be DDP
     Buyer's dock or as otherwise specified in the Release. Buyer will ship
     empty containers to the point of manufacture in a timely manner. All Items
     shall be prepared for shipment in a manner which: (i) follows good
     commercial practice; (ii) is acceptable to common carriers for shipment at
     the lowest rate; and (iii) is adequate to ensure safe arrival. Supplier
     shall mark all containers with necessary lifting, handling and shipping
     information, purchase order number, date of shipment and the names of the
     Buyer and Supplier. Buyer shall

                                      -6-
<PAGE>   7

     notify Supplier of the method of shipment and expected delivery date. If no
     instructions are given, Supplier shall select the most cost effective
     carrier, given the time constraints known to Supplier. Supplier shall ship
     only the quantity of Items specified in the Release. Buyer may return at
     Supplier's expense any Items in excess of the quantity stated in the
     Release.

D.   Supplier shall be responsible for all Supplier's activities through
     manufacture, storage, transport, and delivery of Items to Buyer. In the
     event that Buyer must deploy emergency, safety, or materials personnel in
     response to an emergency or non-compliance with Intel or regulatory
     procedure involving Items supplied hereunder, Buyer and Supplier will
     review the incident. If Buyer and Supplier agree that (i) such deployment
     was necessary, and (ii)Supplier's negligent act or failure to act was the
     proximate cause of such emergency or non-compliance, then Supplier agrees
     to reimburse Buyer for the out-of-pocket cost incurred by Buyer in
     deploying its personnel to respond to such incident. Supplier will not be
     responsible for costs incurred by such deployment due to Buyer's negligent
     act or failure to act. International shipments: Supplier will provide
     Buyer's representative with shipping documents as requested. Buyer's
     purchase orders will contain detailed shipping instructions. E. Shipment of
     all Items qualified for Buyer's Preship or Direct Ship Programs will be
     done in accordance with latest mutually accepted Intel Specification 07-402
     (Intel Chemical and Gas Quality Program.).

12.  OWNERSHIP AND BAILMENT RESPONSIBILITIES

A.   Any specifications, drawings, schematics, technical information, data,
     tools, dies, patterns, masks, gauges, test equipment, and other materials
     furnished or paid for by Buyer shall: (i) be kept confidential; (ii) remain
     Buyer's property; (iii) be used by Supplier exclusively for Buyer's orders;
     (iv) be clearly marked as Buyer's property and segregated when not in use;
     (v) be kept in good working condition at Supplier's expense; and (vi) be
     shipped to Buyer promptly on demand.

B.   Supplier shall insure Buyer's property and be liable for loss or damage
     while in Supplier's possession or control, ordinary wear and tear excepted.

13.  CONFIDENTIALITY AND PUBLICITY

A.   During the course of this Agreement, either party may have or may be
     provided access to the other's confidential information and materials.
     Provided such are marked in a manner reasonably intended to make the
     recipient aware, or the recipient is sent written notice within forty-eight
     (48) hours of disclosure, that the information or materials are
     "Confidential", each party agrees to maintain such information in
     accordance with the terms of this Agreement and the CNDA referenced on the
     signature page of this Agreement or any applicable separate nondisclosure
     agreement between Buyer and Supplier. In the absence of a CNDA or other
     written agreement, at a minimum each party agrees to maintain such
     information in confidence and limit disclosure on a need to know basis, to
     take all reasonable precautions to prevent unauthorized disclosure, and to
     treat such information as it treats it's own information of a similar
     nature, until the information becomes publicly available through no fault
     of the non disclosing party. Supplier's employees who access Buyer's
     facilities may be required to sign a separate non-disclosure agreement
     prior to admittance to Buyer's facilities.

B.   The parties agree that neither will disclose the existence of this
     Agreement, nor any of its details or the existence of the relationship
     created by this Agreement, to any third party without the specific, written
     consent of the other. If disclosure of this Agreement or any of the terms
     hereof is required by applicable law, rule or regulation, or is compelled
     by a court or governmental agency, authority or body: (i) the parties shall
     use all legitimate and legal means available to minimize the disclosure to
     third parties of the content of the Agreement, including without limitation
     seeking a confidential

                                      -7-
<PAGE>   8

     treatment request or protective order; (ii) the disclosing party shall
     inform the other party at least ten (10) business days (i.e., not a
     Saturday, Sunday or a day on which banks are not open for business in the
     geographic area in which the non-disclosing party's principal office is
     located) in advance of the disclosure; and (iii) the disclosing party shall
     give the other party a reasonable opportunity to review and comment upon
     the disclosure, and any request for confidential treatment or a protective
     order pertaining thereto, prior to making such disclosure. The parties may
     disclose this Agreement in confidence to their respective legal counsel,
     accountants, bankers and financing sources as necessary in connection with
     obtaining services from such third parties. The obligations stated in this
     section shall survive the expiration or termination of this Agreement.

14.  PATENTS, COPYRIGHTS, TRADE SECRETS, TRADEMARKS AND MASKWORK RIGHTS

A.   Supplier makes no agreement to defend, indemnify or hold Buyer harmless
     from any costs, expenses, losses, damages or liabilities incurred because
     of actual or alleged infringement of any patent, trade secret or other
     intellectual property right by, or arising from use of, [ ] slurry or any
     other Items designated as custom by the parties. For all other Items,
     Supplier agrees to indemnify and hold Buyer harmless from any costs and
     expenses (including reasonable attorneys' fees) incurred in connection
     with, and damages awarded to a third party as a direct result of,
     adjudicated claims of infringement of any third party patent, trade secret,
     trademark or other intellectual property right arising out of the purchase
     of Items by Buyer or the use of Items by Buyer or Buyer's customers,
     provided, however, that Seller is not obligated to so indemnify Buyer, if
     (i) the sale of such Item by Supplier does not constitute contributory
     infringement or inducement to infringe; or (ii) Buyer modifies the Item; or
     (iii) Buyer uses the Item in a manner other than the specific use for which
     the Item is sold by Supplier. Buyer shall promptly notify Supplier of such
     claim or demand and shall permit Supplier to participate in the defense
     thereof.

B.   To the extent any settlement of a claim or demand is for an amount less
     than the Liability Cap set forth in this Section, Supplier shall have the
     right to settle said claim at its discretion.

C.   If an injunction issues as a result of any such claim or action or if
     Supplier determines in good faith that it is unable or unwilling to supply
     an Item because the Item itself or the use of the Item may infringe a
     patent or may constitute a misappropriation of a trade secret, Supplier
     agrees at its expense and Buyer's option to either: (i) procure for Buyer
     and Buyer's customers the right to continue using Items; (ii) replace them
     with non-infringing Items; or (iii) modify them so they become
     non-infringing. Buyer's sole remedy for Supplier's failure to supply or to
     obtain the remedy elected shall be [ ], and upon [ ] Supplier shall not be
     deemed in breach of this Agreement.

D.   In no event shall Supplier's total and aggregate liability under Section
     14A above exceed forty million dollars ($40,000,000.00)(the "Liability
     Cap"). The limitation on liability contained in this Section 14 is separate
     and independent from the [ ] contained in Section 8, and the amount of
     liability imposed under one of these Sections does not limit or restrict
     the amount of liability imposed under another Section.

15.  HAZARDOUS MATERIALS

A.   If Items or any services provided hereunder include hazardous materials as
     defined by relevant local, state, and national law, Supplier represents and
     warrants that Supplier and its personnel providing services to Buyer
     understand the nature of and hazards associated with the design and/or
     service of Items including handling, transportation, and use of such
     hazardous materials, as applicable to Supplier. Prior to causing hazardous
     materials to be on Buyer's property, Supplier shall obtain written approval
     from Buyer's Site Environmental/Health/Safety organization. Supplier will
     indemnify Buyer from any

                                      -8-
<PAGE>   9

     environmental liability incurred by Buyer which results from the shipment
     and delivery of hazardous Items to Buyer, provided Buyer's negligence was
     not a proximate cause of such liability.

B.   Supplier will timely provide Buyer with material safety data sheets and any
     other documentation reasonably necessary to enable Buyer to comply with
     applicable laws and regulations.

C.   Supplier hereby certifies that Items supplied to Buyer do not contain and
     are not manufactured with any ozone depleting substances, as those terms
     are defined by law.

16.  CUSTOMS CLEARANCE

     Upon Buyer's request, Supplier will promptly provide Buyer with a statement
     of origin for all Items and with applicable customs documentation for Items
     wholly or partially manufactured outside of the country of import.

17.  COMPLIANCE WITH LAWS

A.   Supplier shall comply with all national, state, and local laws and
     regulations governing the manufacture, transportation, and/or sale of Items
     and/or the performance of services in the course of this Agreement. In the
     United States, these may include, but are not limited to, Department of
     Commerce, Environmental Protection Agency, and Department of Transportation
     regulations applicable to hazardous materials.

B.   Supplier represents and agrees that it is in compliance with Executive
     Order 11246 and implementing Equal Employment Opportunity regulations and
     the Immigration Act of 1987, unless exempted or inapplicable.

18.  MERGER, MODIFICATION, WAIVER, AND REMEDIES

A.   This Agreement contains the entire understanding between Buyer and Supplier
     with respect to the subject matter hereof and merges and supersedes all
     prior and contemporaneous agreements, dealings and negotiations. No
     modification, alteration or amendment shall be effective unless made in
     writing, dated and signed by duly authorized representatives of both
     parties.

B.   No waiver of any breach hereof shall be held to be a waiver of any other or
     subsequent breach.

C.   Except as otherwise expressly limited herein, the parties' rights and
     remedies herein are in addition to any other rights and remedies provided
     by law or in equity.

D.   If any provision of this Agreement is determined by a court of competent
     jurisdiction to be invalid, illegal or unenforceable, such determination
     shall not affect the validity of the remaining provisions unless Buyer
     determines in its discretion that the court's determination causes this
     Agreement to fail in any of its essential purposes.

19.  ASSIGNMENT

     Neither party may assign or factor any rights in nor delegate any
     obligations under this Agreement or any portion thereof without the written
     consent of the other. However, Supplier may assign its rights and
     obligations hereunder to its direct and indirect subsidiaries, without such
     consent. Buyer may cancel this Agreement for cause should Supplier attempt
     to make an unauthorized assignment of any right or obligation arising
     hereunder.

20.  APPLICABLE LAW

     This Agreement is to be construed and interpreted according to the laws of
     the State of Delaware, excluding its conflict of laws provisions. This
     Agreement is not subject to the United Nations Convention on Contracts for
     the International Sale of Goods, in accordance with Article 6 thereof.

                                      -9-
<PAGE>   10

21.  HEADINGS

     The headings provided in this Agreement are for convenience only and shall
     not be used in interpreting or construing this Agreement.

22.  SPECIFIC PERFORMANCE

     Notwithstanding anything else contained in this Agreement, the parties
     hereto agree that failure to perform certain obligations undertaken in
     connection with this Agreement would cause irreparable damage, and that
     monetary damages would not provide an adequate remedy in such event. The
     parties further agree that failure to deliver against accepted Purchase
     Orders, or to deliver confirmed supply or pricing, are such obligations.
     Accordingly, it is agreed that, in addition to any other remedy to which
     the non breaching party may be entitled, at law or in equity, the non
     breaching party shall be entitled to injunctive relief to prevent breaches
     of the provisions of this Agreement, and an order of specific performance
     to compel performance of such obligations in any action instituted in any
     court of the United States or any state thereof having subject matter
     jurisdiction.

23.  SURVIVAL

     The provisions of Sections: 1, 8, 13, 14, 15, 20 will survive any
     termination or expiration of this Agreement. In addition, any license
     granted pursuant to Section 25 which is exercised prior to the Expiration
     Date shall remain in force and effect for a period of three (3) years
     following the Expiration Date, and Section 25 shall survive for this
     three-year time period following the Expiration Date.

24.  VOLUME COMMITMENTS

A.   Buyer's and Supplier's volume obligations and sales commitments for [ ] are
     set forth in Addendum D for the years set forth therein.

B.   Notwithstanding the volume obligations described above and set forth in
     detail in Addendum D of this Agreement, in the event that (i) Buyer is made
     a party to litigation arising from a claim of intellectual property
     infringement for which Buyer is indemnified, pursuant to Section 14 above,
     and (ii) Buyer determines, in good faith, after a thorough review of the
     claim, underlying patent, requested relief, Buyer's defenses and other
     relevant facts, that Supplier's indemnification obligation (which Supplier
     has the unilateral right to increase) would not be adequate with respect to
     the potential liability to such person, [ ], unless Supplier agrees in
     writing to increase the amount of the Liability Cap set forth in Section 14
     to a level which exceeds Buyer's good faith estimate of the amount of the
     likely damages to be incurred in such lawsuit.

C.   Notwithstanding the volume obligations described above and set forth in
     detail in Addendum D of this Agreement, in the event Supplier does not
     supply a particular Item for the reasons stated in Section 14C above,
     Supplier shall be released from its contractual obligation to supply the
     affected Item to Buyer.

25.  LICENSE

A.   Supplier agrees to grant to Buyer and/or its designee a contingent,
     royalty-free, fully-paid, worldwide, non-exclusive, irrevocable license,
     under those intellectual property rights that are owned by Supplier, or
     licensed to Supplier (which Supplier has the right to sublicense), that are
     necessary to make, use and import, and in the

                                      -10-
<PAGE>   11

     case of any such designee, to sell to Buyer or offer for sale to Buyer,
     those specific Items that Supplier is not able to supply under this
     Agreement for one of the following reasons:

     (i) Supplier is [ ] selling or delivering such specific Item(s) to Buyer,
     or

     (ii) Supplier determines in good faith that it is [ ].

     The above described license is expressly limited to the right to make Items
     for Buyer's sole use, or in the case of a designee, to make, sell or offer
     for sale Items (not supplied for the reasons set forth above), in an amount
     not to exceed those set forth in Addendum D, for Buyer's sole use. In
     addition, the above described license shall not obligate Supplier to
     disclose any trade secrets to Buyer or its designee other than the
     formulation (i.e., the ingredients and proportions) of the Item which has
     not been supplied. Any disclosure of such Item's formulation to Buyer
     and/or its designee shall be subject to Buyer and/or its designee entering
     into appropriate obligations of confidentiality with respect to such
     formulation.

B.   In the event (i) Buyer is made a defendant in litigation by any person or
     entity other than [ ], arising from a claim of patent infringement for
     which Buyer is indemnified, pursuant to Section 14 above; and (ii) Supplier
     is willing to continue to supply the affected Items; and (iii) Supplier is
     unable to settle such litigation for an amount less than the [ ]; and (iv)
     Buyer determines, in good faith, after a thorough review of the claim,
     underlying patent, requested relief, Buyer's defenses and other relevant
     facts, that Supplier's indemnification obligation (which Supplier has the
     unilateral right [ ] with respect to the [ ] to such person, then Supplier
     shall be obligated to either:

          (i) Grant to Buyer and/or its designee a non-exclusive,
     royalty-bearing, irrevocable license, under those patent rights that are
     owned by Supplier, or licensed to Supplier (which Supplier has the right to
     sublicense), that are necessary to make, use and import, and in the case of
     any such designee, to make and sell to Buyer or offer for sale to Buyer,
     those specific Items (in an amount not to exceed that set forth in Addendum
     D) that are the subject of such litigation, provided, that Supplier
     receives a non-exclusive, royalty-bearing, perpetual, irrevocable license
     under the patent that is being asserted in the infringement litigation and
     any other such patents of such party that are necessary to make and use
     those specific Items. The [ ] in such case with respect to the
     cross-licenses granted shall be [ ] of the purchase price or fair market
     value (if produced by Buyer internally) of the Item that is [ ]; or

          (ii) Grant to Buyer and/or its designee a non-exclusive,
     royalty-bearing, irrevocable license, under those patents that are owned by
     Supplier, or licensed to Supplier (which Supplier has the right to
     sublicense), that are necessary to make, use and import, and in the case of
     any such designee, to make and sell to Buyer or offer for sale to Buyer,
     those specific Items that are the subject of such litigation. The [ ] in
     such case shall be [ ] of the purchase price or fair market value (if
     produced by Buyer internally) of the Item that is [ ]. The foregoing
     license grant is expressly limited to the right to make Items (in an amount
     not to exceed that set forth in Addendum D) for Buyer's sole use.

     In the event Buyer exercises its right to have a license granted to Buyer
     and/or its designee under this Section 25B, any such license grant shall
     not subsequently

                                      -11-
<PAGE>   12

     revert to a license grant under Section 25A, regardless of whether Supplier
     subsequently stops supplying the affected Item.

                                      -12-
<PAGE>   13

                                   ADDENDUM A

                     PRODUCT DESCRIPTION AND PRICE SCHEDULE

A. [   ]

TABLE A

     PRICES WHICH APPLY IF BUYER PURCHASES [ ]% SHARE OF BUYER'S TOTAL
REQUIREMENTS FOR CMP SLURRIES UTILIZED IN [ ] POLISHING ASSOCIATED WITH THE
FOLLOWING MANUFACTURING PROCESSES OF BUYER: [ ]

<TABLE>
<CAPTION>
   CABOT PART #        PKG         POINT OF           DESTINATION         PRICE PER GALLON
                                 MANUFACTURE
<S>                  <C>        <C>               <C>                     <C>
       [ ]             IBC      United States     United States (FOB            $[ ]
                                                   local Warehouse)

                                                     Ireland (DDU)              $[ ]

                                                     Israel (DDP)               $[ ]

       [ ]             IBC       Barry, Wales     United States (FOB            $[ ]
                                                   local Warehouse)

                                                     Ireland (DDU)              $[ ]

                                                     Israel (DDP)               $[ ]

       [ ]           IBC/DTA    United States     United States (FOB            $[ ]
                                                   local Warehouse)
</TABLE>

TABLE B

     PRICES WHICH APPLY IF BUYER PURCHASES [ ]% SHARE OF BUYER'S TOTAL
REQUIREMENTS FOR CMP SLURRIES UTILIZED IN [ ] POLISHING ASSOCIATED WITH THE
FOLLOWING MANUFACTURING PROCESSES OF BUYER: [ ]

<TABLE>
<CAPTION>
   CABOT PART #        PKG         POINT OF          DESTINATION          PRICE PER GALLON
                                 MANUFACTURE
<S>                  <C>        <C>               <C>                     <C>
       [ ]             IBC      United States     United States (FOB            $[ ]
                                                   local Warehouse)

                                                    Ireland (DDU)               $[ ]

                                                     Israel (DDP)               $[ ]

       [ ]             IBC       Barry, Wales     United States (FOB            $[ ]
                                                   local Warehouse)

                                                    Ireland (DDU)               $[ ]

                                                     Israel (DDP)               $[ ]

       [ ]           IBC/DTA    United States     United States (FOB            $[ ]
                                                   local Warehouse)
</TABLE>

                                      -13-
<PAGE>   14

TABLE C

     PRICES WHICH APPLY IF BUYER PURCHASES [ ]% SHARE OF BUYER'S TOTAL
REQUIREMENTS FOR CMP SLURRIES UTILIZED IN [ ] POLISHING ASSOCIATED WITH THE
FOLLOWING MANUFACTURING PROCESSES OF BUYER: [ ]

<TABLE>
<CAPTION>
   CABOT PART #        PKG         POINT OF          DESTINATION          PRICE PER GALLON
                                 MANUFACTURE
<S>                  <C>        <C>               <C>                     <C>

       [ ]             IBC      United States     United States (FOB            $[ ]
                                                   local Warehouse)

                                                    Ireland (DDU)               $[ ]

                                                     Israel (DDP)               $[ ]

       [ ]             IBC       Barry, Wales     United States (FOB            $[ ]
                                                   local Warehouse)

                                                    Ireland (DDU)               $[ ]

                                                     Israel (DDP)               $[ ]

       [ ]           IBC/DTA    United States     United States (FOB            $[ ]
                                                   local Warehouse)
</TABLE>

     Prices for purchases of requirements percentages between the requirements
     percentages shown in the above tables (i.e. quantities between [ ]%, [ ]%
     and [ ]%) shall be determined by a straight line extrapolation of the
     prices shown in the above tables.

     The price per gallon of [ ] shall be calculated based upon the percent
     share of Buyer's requirements for [ ] or its equivalent associated with
     Buyer's [ ] manufacturing processes which Buyer forecasts for the relevant
     calendar year. For example, if Buyer purchases [ ]% of its total
     requirements for [ ] or its equivalent associated with Buyer's [ ]
     manufacturing processes in the form of [ ] from Supplier in calendar year
     2000, the price will be determined using Table B. However, if Buyer
     purchases [ ]% of its total requirements for [ ] or its equivalent
     associated with Buyer's [ ] manufacturing processes in the form of [ ] from
     Supplier in calendar year 2000, the price will be determined using Table A.

B. [    ]

<TABLE>
<CAPTION>
CABOT PART #       PKG     POINT OF     DESTINATION    PRICE BASED ON CUMULATIVE VOLUMES OF [       ] PURCHASED
                         MANUFACTURE
<S>                <C>  <C>             <C>            <C>         <C>        <C>        <C>          <C>            <C>
                                            #            [ ]-[ ]   [ ]-[ ]    [ ]-[ ]    [ ]-[ ]      [ ]-[ ]        > [ ]*
[   ]              IBC  United States   United States     $[ ]      $[ ]       $[ ]        $[ ]         $[ ]          $[ ]
                                        (FOB local
                                         warehouse)
                        United States      Israel         $[ ]      $[ ]       $[ ]        $[ ]         $[ ]          $[ ]
                                           (DDP)
                        United States   Ireland (DDU)     $[ ]      $[ ]       $[ ]        $[ ]         $[ ]          $[ ]
</TABLE>

*    volumes in thousands of gallons

     The price per gallon of [ ] shall be calculated based upon the cumulative
     volume of gallons of [ ] purchased by Buyer from Supplier during the term
     of this Agreement. Adjustments to the price, based upon the cumulative
     gallons of [ ] purchased by

                                      -14-
<PAGE>   15

     Buyer from Supplier, shall take effect in the quarter following the quarter
     in which Buyer surpasses a volume threshold.

C. [    ]

<TABLE>
<CAPTION>
       CABOT PART #               PKG          POINT OF MANUFACTURE            DESTINATION #          PRICE PER GALLON
<S>                               <C>          <C>                        <C>                         <C>
           [ ] *                  IBC              United States          United Sates (FOB local           $[ ]
                                                                                 warehouse)

           [ ] *                  IBC              United States               Ireland (DDU)                $[ ]

           [ ] *                  IBC              Barry, Wales                Ireland (DDU)                $[ ]

           [ ] *                  IBC              Barry, Wales           United Sates (FOB local           $[ ]
                                                                                 warehouse)
</TABLE>

*    [   ]

D. [   ]

<TABLE>
<CAPTION>
       CABOT PART #              PKG           POINT OF MANUFACTURE            DESTINATION #          PRICE PER GALLON
<S>                              <C>           <C>                        <C>                         <C>
            [ ]                  IBC              United States           United Sates (FOB local           $[ ]
                                                                                warehouse)
</TABLE>

                                      -15-
<PAGE>   16

                                   ADDENDUM B

KEY CONTACTS & INTEL FAB LOCATIONS

<TABLE>
<CAPTION>
DEPARTMENT/TITLE                            NAME                  PHONE

<S>                                         <C>                   <C>
OHKA:
Account Representative                      Brad Staley           630-375-5508
Accounts Receivable                                               630-585-9471
24-Hour Emergency Contact                   Brad Staley           630-375-5508
Schedule/Delivery Contact                   Soni Pahia            916-939-9364
General                                     Bruce Zwicker         630-375-5540

INTEL:
FMO
Commercial                                  Mumtaz Ahmed          408-765-88
Technical                                   Ara Philipossian      408-765-6256
                                            Joe Schoenholtz       408-765-2435
Buyers
        Ireland                             Caitriona Delaney     011-353-1-606-8630
        New Mexico                          Tami Freeman          505-893-3538
           Fab 6                            Oscar Ochoa           602-554-8417
           Fab 12                           Oscar Ochoa           602-554-8417
        Israel
  Fab 8                                     Anna Provad           011-972-2-5896357
           Fab 18                           Yaron Ozer            011-972-7-666-6953
        Santa Clara
        D2                                  Karen Ma              408-765-6152
                                            Ethel Swindall        408-765-2392
      Oregon                                Heather Holcomb       503-642-8693
      Massachusetts
         F17                                Tony Quarta
Accounts Payable:
        AZ/CA                               Linda Medill          503-696-3237
        OR                                  Jessica Ailshie       503-696-3046
        NM                                  Debbie Martin         503-696-3302
</TABLE>

                                      -16-
<PAGE>   17

                                   ADDENDUM C
                              QUALITY REQUIREMENTS

                     LIST OF GOVERNING INTEL SPECIFICATIONS

<TABLE>
<CAPTION>
SPEC. NO.           REV.                   TITLE                                                 ISSUE DATE

<S>                 <C>       <C>                                                                <C>
07-116              0         MATERIALS CHANGE CONTROL POLICY                                     05/22/98

07-123              2         SUPPLIER CORRECTIVE ACTION POLICY                                   02/25/98

07-124              4         FMO/ATMO-DISCREPANT RAW MATERIAL DISPOSITION POLICY                 06/09/98

07-400              7         CHEMICALS SPECIFICATION SYSTEM                                      06/05/97

07-401              6         PROCEDURE FOR SHIPPING & RECEIVING OF CHEMICALS                     12/05/97

07-402              5         INTEL CHEMICAL QUALITY PROGRAM                                      06/26/98

07-403              2         SHIPPING OF TEMP-SENSITIVE CHEMICALS                                12/05/97

07-411              4         PROCUREMENT SPEC FOR CHEMICALS                                      11/25/98
</TABLE>

                                      -17-
<PAGE>   18

                                   ADDENDUM D
                               VOLUME OBLIGATIONS

A. [    ]

         During the years set forth below, Buyer shall be obligated to purchase
from Supplier a [ ] volume of [ ] which is equal to the product of (i) Buyer's
total requirements for [ ] utilized in [ ] polishing associated with Buyer's [ ]
manufacturing processes ("[ ] Slurry Requirements"), multiplied by (ii) the [ ]
Percentage (set forth in the table below). During the years specified below,
Supplier shall be obligated to supply to Buyer a volume of [ ] which is equal to
the product of (i) Buyer's forecasted volume of [ ] Slurry Requirements for the
upcoming calendar year (which forecast shall be provided to Supplier 90 days
prior to the commencement of each calendar year), multiplied by (ii) the [ ]
Percentage (set forth in the table below).

[   ] SLURRY VOLUME OBLIGATIONS

<TABLE>
<CAPTION>
    CALENDAR YEAR             BUYER'S [ ] PERCENTAGE                 SUPPLIER'S [ ] PERCENTAGE
    -------------             ----------------------                 -------------------------
<S>                           <C>                                    <C>
        1999                           [ ] %                                   [ ] %
        2000                           [ ] %                                   [ ] %
        2001                           [ ] %                                   [ ] %
</TABLE>

Ninety days prior to the commencement of each calendar year, Buyer shall commit
and obligate itself to purchase from Supplier a specific percentage of its [ ]
Slurry Requirements (which percentage shall be at least as large as the [ ]
Percentage) which it shall purchase from Supplier during the upcoming year. The
amount of [ ] which Buyer will purchase, above the [ ] Percentage, will be
determined according to whether Supplier meets requirements set by Buyer's
Supplier Score Card.

B. [   ]

     During the years set forth below, Buyer shall be obligated to purchase from
Supplier a [ ] volume of [ ] which is equal to the product of (i) Buyer's total
requirements for [ ] utilized in [ ] polishing applications associated with
Buyer's [ ] manufacturing processes ("[ ] Requirements"), multiplied by (ii) the
[ ] Percentage (set forth in the table below). During the years specified below,
Supplier shall be obligated to supply to Buyer a volume of [ ] which is equal to
the product of (i) Buyer's forecasted volume of [ ] Requirements for the
upcoming calendar year (which forecast shall be provided to Supplier 90 days
prior to the commencement of each calendar year), multiplied by (ii) the [ ]
Percentage (set forth in the table below). Notwithstanding the foregoing, during
the course of any

                                      -18-
<PAGE>   19

calendar year, Buyer may, by giving 4 months advance written notification to
Supplier, increase its forecasted [ ] requirements for the remainder of the year
(starting after the 4 month notice period), provided, however, such new
forecasted amount may not exceed a volume which is greater than the product of
the remaining volumes from the original forecasted amount, multiplied by [ ].

[     ] SLURRY VOLUME OBLIGATIONS

<TABLE>
<CAPTION>
    CALENDAR YEAR           BUYER'S [ ] PERCENTAGE               SUPPLIER'S [ ] PERCENTAGE
<S>                         <C>                                  <C>
        1999                         [ ] %                                 [ ] %
        2000                         [ ] %                                 [ ] %
        2001                         [ ] %                                 [ ] %
</TABLE>

90 days prior to the commencement of 2001, Buyer shall commit and obligate
itself to purchase from Supplier a specific percentage of its [ ] Requirements
(which percentage shall be at least as large as the [ ] Percentage) which it
shall purchase from Supplier during 2001. The amount of [ ] which Buyer will
purchase, above the [ ] Percentage, will be determined according to whether
Supplier meets requirements set by Buyer's Supplier Score Card.

C. [    ]

During the years set forth below, Buyer shall be obligated to purchase from
Supplier a [ ] volume of [ ] which is equal to the product of (i) Buyer's total
requirements for [ ] utilized in [ ] polishing applications associated with
Buyer's [ ] manufacturing processes ("[ ] Requirements"), multiplied by (ii) the
[ ] Percentage (set forth in the table below). For each month of this Agreement,
Supplier shall be obligated to supply to Buyer a volume of [ ] which is equal to
the product of (i) the volume of [ ] Buyer purchased from Supplier during the
preceding month, multiplied by (ii) the [ ] Percentage (set forth in the table
below).

[    ]  SLURRY VOLUME OBLIGATIONS

<TABLE>
<CAPTION>
    CALENDAR YEAR                  [ ] PERCENTAGE                                [ ] PERCENTAGE
<S>                                <C>                                           <C>
        1999                           [ ] %                                          [ ] %
        2000                           [ ] %                                          [ ] %
        2001                           [ ] %                                          [ ] %
</TABLE>

D. [    ]

     Neither Buyer nor Supplier have any volume obligations with respect to [ ]

                                      -19-
<PAGE>   20
 With respect to all of the above describe Items, in the event Buyer does not
purchase a particular Item for use in its facilities in either North America,
Ireland and/or Israel for any [ ], Supplier shall no longer be obligated to
supply such Item to Buyer's facilities in the relevant geographic region.

                                      -20-

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