Document:

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                                                                   EXHIBIT 10.12

                    MASTER INVENTION DISCLOSURE ASSIGNMENT
                    --------------------------------------

          This Agreement, dated March 31, 2001, between Millipore Corporation, a
     Massachusetts corporation having a place of business at 80 Ashby Road,
     Bedford, Massachusetts 01730 ("Millipore") and Mykrolis Corporation, a
     Delaware corporation, having a place of business at Patriots Park, Bedford,
     Massachusetts 01730 ("Mykrolis").

          WHEREAS, the Board of Directors of Millipore Corporation has
     determined that it is in the best interest of Millipore and its
     stockholders to separate Millipore's existing businesses into two
     independent businesses;

          WHEREAS, as part of the foregoing, Millipore and Mykrolis, have
     entered into a Master Separation and Distribution Agreement (as defined
     below) which provides, among other things, for the separation of certain
     Mykrolis assets and Mykrolis liabilities, the initial public offering of
     Mykrolis stock, the distribution of such stock and the execution and
     delivery of certain other agreements in order to facilitate and provide for
     the foregoing;

          WHEREAS, Millipore is the owner via employment agreements from the
     inventor(s) of the inventions described in Invention Disclosures relating
     to the Mykrolis Business (as defined in the Master Separation and
     Distribution Agreement) ("Disclosures"); and

          WHEREAS, Mykrolis is desirous of acquiring said Disclosures.

          NOW, THEREFORE, for good and valuable consideration, the receipt of
     which is hereby acknowledged, MILLIPORE by these presents does sell, assign
     and transfer unto Mykrolis its successors and assigns the full, exclusive
     and worldwide right to all inventions that may arise from the Disclosures
     including the right to file a patent application in the United States of
     America or in countries foreign to the United States of America, and the
     entire right, title and interest in, to and under any Letters Patent which
     may be granted on said inventions, or any parts thereof, or on any
     continuation, division or reissue thereof in the United States of America,
     in the territorial possessions of the United States of America and in any
     country foreign to the United States of America, the same to be held and
     enjoyed by Mykrolis, its successors and assigns as fully and entirely as
     the same would have been held by MILLIPORE, had this assignment not been
     made.

          And MILLIPORE does hereby agree for itself and for its successors and
     assigns to execute any lawful document and to testify as to any material
     fact or thing which Mykrolis, its successors and assigns may deem necessary
     in order to secure unto itself, its successors and assigns the full right,
     title and interest in and to the full enjoyment of all such inventions or
     any part thereof and any Letters Patent that may arise form the
     Disclosures, the same to be done without any further consideration.

<PAGE>

          IN WITNESS WHEREOF, I set my hand this 31st day of March, 2001.

          /s/ Francis J. Lunger
          --------------------------------
                   (Signature)

          Francis J. Lunger
          --------------------------------
                   (Typed Name)

          Executive Vice President, Millipore Corporation
          -----------------------------------------------

          On this day and year aforesaid, before me personally appeared Francis
 J. Lunger, known to me to be the person described in and the person who
 executed the foregoing instrument of assignment and he/she did acknowledge the
 same to be his/her free act and deed.

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

                               /s/ Peter W. Walcott
                               ----------------------------------, Notary Public

                               My Commission expires  8/3/01
                                                    ---------------------------

          IN WITNESS WHEREOF, I set my hand this  31st day of March, 2001.

          Jean-Marc Pandraud
          --------------------------------
                    (Signature)

          Jean-Marc Pandraud
          --------------------------------

          President, Mykrolis Corporation
          --------------------------------

          On this day and year aforesaid, before me personally appeared Jean-
 Marc Pandraud , known to me to be the person described in and the person who
 executed the foregoing instrument of assignment and he/she did acknowledge the
 same to be his/her free act and deed.

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

                               /s/ Peter W. Walcott
                               ----------------------------------, Notary Public

                               My Commission expires  8/3/01
                                                    ---------------------------

                                       2<PAGE>

                                                                   EXHIBIT 10.13

                  MASTER TRADE SECRET and KNOW-HOW AGREEMENT

     This Master Trade Secret and Know-How Agreement (the "Agreement') is
effective as of March 31, 2001 (the "Effective Date"), between Millipore
Corporation, a Massachusetts corporation ("MIL"), having an office at 80 Ashby
Road, Bedford, Massachusetts 01730 and Mykrolis Corporation, a Delaware
corporation ("Mykrolis"), having an office at Patriots Park, Bedford,
Massachusetts 01730.

     WHEREAS, the Board of Directors of Millipore Corporation ("MIL") has
determined that it is in the best interest of MIL and its stockholders to
separate Millipore's existing businesses into two independent businesses;

     WHEREAS, as part of the foregoing, MIL and Mykrolis, have entered into a
Master Separation and Distribution Agreement (as defined below) which provides,
among other things, for the separation of certain Mykrolis assets and Mykrolis
liabilities, the initial public offering of Mykrolis stock, the distribution of
such stock and the execution and delivery of certain other agreements in order
to facilitate and provide for the foregoing;

     WHEREAS, all know-how has been owned by MIL until the Separation Date and
each of the parties have, until the Separation Date, used some know-how solely
in their own businesses as well as some of the same know-how in each of their
businesses relating to the manufacture and testing of products as well as plant
configurations, manufacturing and research processes and other such commonly
used know-how ("Commonly Used Know-How");

     WHEREAS, the parties deem that it is necessary for the successful operation
of each entity after the separation for each party to own that know-how which it
alone uses in its business as of the date of the Agreement; to own, but license
back rights to the other party, to that Commonly Used Know-How which is owned by
that party and to have the right to practice the Commonly Used Know-How owned by
the other party in their respective field of use; and

     WHEREAS in order to accomplish this, MIL agrees to assign certain know-how
to Mykrolis and the parties agree to license certain of the Commonly Used Know-
How to each other after the separation of the Mykrolis business.

     NOW, THEREFORE, in consideration of the mutual promises of the parties, and
of good and valuable consideration, it is agreed by and between the parties as
follows:

                                   ARTICLE 1
                                  DEFINITIONS

     For the purpose of this Agreement, the following capitalized terms are
defined in this Article 1 and shall have the meaning specified herein:
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     1.1  ASSIGNED KNOW-HOW.  "Assigned Know-How" means business information,
technical data, know-how and other information which is not otherwise in the
public domain and of which MIL undertook to restrict or control the disclosure
to Persons other than MIL as of the Separation Date in a manner reasonably
intended to maintain its confidentiality, and which (i) was owned by MIL on or
before the Separation Date,  (ii) is the subject of this Agreement and is known
to or in the possession of Mykrolis as of the Separation Date and (ii) is used
by Mykrolis as of the Separation Date in the manufacture and sale of the
products listed in Exhibit A.  Confidential Information may include information
relating to, by way of example, research, products, services, customers,
markets, software, developments, inventions, processes, designs, drawings,
engineering, marketing or finances, and may be in writing, disclosed orally or
learned by inspection of computer programming code, equipment or facilities

     1.2  LICENSED KNOW-HOW  "Licensed Know-How" means business information,
technical data, know-how and other information which is not otherwise in the
public domain and of which MIL undertook to restrict or control the disclosure
to Persons other than MIL as of the Separation Date in a manner reasonably
intended to maintain its confidentiality, and which (i) is owned by MIL as of
the Separation Date, (ii) both parties had access to on or before the Separation
Date, (iii) is the subject of this Agreement and is known to or in the
possession of the parties as of the Separation Date and (iv) is used by each
party in its respective field of use for the manufacture and sale of its
respective products as of the Separation Date.  Confidential Information may
include information relating to, by way of example, research, products,
services, customers, markets, software, developments, inventions, processes,
designs, drawings, engineering, marketing or finances, and may be in writing,
disclosed orally or learned by inspection of computer programming code,
equipment or facilities.

     1.3  MASTER SEPARATION AND DISTRIBUTION AGREEMENT.  "Master Separation and
Distribution Agreement" means the Master Separation and Distribution Agreement
between the parties.

     1.4  MIL Field of Use " means BIOPHARM including
pharmaceutical/biotechnology and genetic engineering companies as well as
manufacturers of cosmetics, medical devices, diagnostic products and clinical
analytical products; LAB & LIFE SCIENCE RESEARCH including government,
university and private research and testing analytical laboratories for
proteomic, genomic, microbiological and similar research and analysis as well as
environmental research and analysis; and FOOD & BEVERAGE including companies
that manufacture or process foods and beverages including dairy products, beer,
wine, juice and soft drink manufacturers and bottled water companies.

     1.5  MIL LICENSED KNOW-HOW. "MIL Licensed Know-How" means that Licensed
Know-How owned by MIL, utilized by both parties in their respective fields of
use for the manufacture and sale of their respective products as of the
Separation Date, licensed to Mykrolis in its field of use under the terms of
this Agreement and listed in Exhibit B to this Agreement.

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     1.6  MIL NON-LICENSED KNOW-HOW. "MIL Non-Licensed Know-How" means that
know-how owned by MIL, used exclusively by MIL as of the Separation Date and not
assigned or licensed to Mykrolis under the terms of this Agreement.

     1.7  MYKROLIS ASSIGNED KNOW-HOW. "Mykrolis Assigned Know-How" means the
Assigned Know-How used solely by Mykrolis or used predominately by Mykrolis as
of the Separation Date to manufacture or sell the products listed in Exhibit A
which is assigned to Mykrolis by MIL under this Agreement.

     1.8  MYKROLIS FIELD OF USE.  "Mykrolis Field of Use" means IC MANUFACTURERS
including companies that manufacture integrated circuits, semiconductors,
semiconductor chips and other microelectronics components, flat panel displays,
solar cells and fiber optic cables, coated optical lenses and coated optical
fibers; IC OEM EQUIP & MATERIALS MANUFACTURING including companies that
manufacture equipment for the fabrication and processing of semiconductors and
integrated circuits for sale to IC Manufacturing Companies as well as companies
that integrate a number of components into subsystems sold to OEM Equipment
manufacturers for incorporation into semiconductor fabrication equipment as well
as Companies that manufacture, process and supply liquids, gases, conductive
materials and other advanced materials to the IC Manufacture industry and which
provide products and systems to purify, monitor and control atmospheric
conditions in clean room manufacturing environments of the IC Manufacturing
Industry;  and IC RESEARCH LABORATORIES including university, government and
commercial laboratories and research operations that research and/or develop
innovations in the structure and composition of integrated circuits, the
processes and materials used to manufacture integrated circuits and new forms of
integrated circuits.

     1.9  MYKROLIS LICENSED KNOW-HOW."Mykrolis Licensed Know-How" means that
Assigned Know-How utilized by both parties as of the Separation Date which is
licensed back to MIL under this Agreement and listed in Exhibit C to this
Agreement.

     1.10 PERSON.  "Person" means an individual, a partnership, a corporation, a
limited liability company, an association, a joint stock company, a trust, a
joint venture, an unincorporated organization, and a governmental entity or any
department, agency or political subdivision thereof.

     1.11 SELL.  To "Sell" a product means to sell, transfer, lease or otherwise
dispose of a product.  "Sale" and "Sold" have the corollary meanings ascribed
thereto.

     1.12 SEPARATION DATE. "Separation Date" means March 31, 2001, or such other
date as may be fixed by the Board of Directors of Millipore Corporation.

     1.13 SUBSIDIARY.  "Subsidiary" of any Person means a corporation or other
organization whether incorporated or unincorporated of which at least a majority
of the securities or interests having by the terms thereof ordinary voting power
to elect at least a majority of the board of directors or others performing
similar functions with respect to such corporation or other organization is
directly or indirectly owned or controlled by such

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Person or by any one or more of its Subsidiaries, or by such Person and one or
more of its Subsidiaries; provided, however, that no Person that is not directly
or indirectly wholly-owned by any other Person shall be a Subsidiary of such
other Person unless such other Person controls, or has the right, power or
ability to control, that Person. For purposes of this Agreement, Mykrolis shall
be deemed not to be a subsidiary of MIL.

     1.14 THIRD PARTY.  "Third Party" means a Person other than MIL and its
other Subsidiaries and Mykrolis and its Subsidiaries.

                                   ARTICLE 2
                       ASSIGNMENT OF KNOW-HOW TO MYKROLIS

     2.1  MIL hereby agrees to assign to Mykrolis the rights owned by MIL in the
Assigned Know-How to own and use as it sees fit, in the sale or manufacture of
current or future products and to modify the Assigned Know-How as it may desire,
provided however, it does not use any MIL Non-assigned Know-How in doing so.
Such assignment is made on an "as is" basis.

     2.2  The parties agree and recognize that the some of the Assigned Know-How
is used in the manufacture and sale of MIL products and that MIL retains the
ownership of Assigned Know-How as used in the manufacture and sale of its
products as of the Separation Date and may use the Assigned Know-How as it sees
fit, in the sale or manufacture of current or future products and to modify the
Assigned Know-How as it may desire.

                                   ARTICLE 3
                                  MIL LICENSES

     3.1  LICENSE GRANT.  MIL grants to Mykrolis a personal, exclusive,
worldwide, fully-paid and non-transferable (except as set forth in Section 13.9)
license to use the MIL Licensed Know-How in the Mykrolis Field of Use.

     3.2  LICENSE RESTRICTIONS.

              (a) Mykrolis may not make any use whatsoever, in whole or in part,
of the MIL Licensed Know-How, in connection with Mykrolis, doing business as, or
in a fictitious name, or in association with a Third Party without the prior
written consent of MIL, except as expressly set forth in Section 3.1 above.

     3.3  LICENSE UNDERTAKINGS.  As a condition to the licenses granted
hereunder, Mykrolis undertakes to MIL that:

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         (a) Mykrolis shall not use the MIL Licensed Know-How in any manner
which is inconsistent with the terms of this Agreement or which compromises or
which might jeopardize or limit MIL's proprietary interest therein.

         (b) Mykrolis shall not use the MIL Licensed Know-How in connection with
any products or services except in the Mykrolis Field of Use.

         (c) Mykrolis shall not (i) misrepresent to any Person the scope of its
authority under this Agreement, (ii) incur or authorize any expenses or
liabilities chargeable to MIL or (iii) take any actions that would impose upon
MIL any obligation or liability to a Third Party other than obligations under
this Agreement, or other obligations which MIL expressly approves in writing for
Mykrolis to incur on their behalf.

     3.4  RESERVATION OF RIGHTS.  Except as otherwise expressly provided in this
Agreement, MIL shall retain all rights in and to the MIL Licensed Know-How,
including without limitation:

         (a)  All rights of ownership in and to the MIL Licensed Know-How;

         (b)  The right to use (including the right of MIL's Subsidiaries to
              use) the MIL Licensed Know-How, in connection with the marketing,
              offer or provision of any product or service, so long as any such
              products or service are not in the Mykrolis Field of Use; and

         (c)  The right to license Third Parties to use the MIL Licensed Know-
              How, so long as any such products or service are not in the
              Mykrolis Field of Use.

                                   ARTICLE 4
                         MYKROLIS PERMITTED SUBLICENSES

     4.1  SUBLICENSES TO SUBSIDIARIES.  Subject to the terms and conditions of
this Agreement, Mykrolis may grant sublicenses to its Subsidiaries to use the
MIL Licensed Know-How in accordance with the license grant in Section 3.1 above;
provided that (i) Mykrolis enters into a written sublicense agreement with each
such Subsidiary sublicensee, and (ii) such agreement does not include the right
to grant further sublicenses.  Mykrolis shall provide copies of such written
sublicense agreements to MIL upon request.  If Mykrolis grants any sublicense
rights pursuant to this Section 4.1 and any such sublicensed Subsidiary ceases
to be a Subsidiary, then the sublicense granted to such Subsidiary pursuant to
this Section 4.1 shall terminate 180 days from the date of such cessation.

     4.2  ENFORCEMENT OF AGREEMENTS.  Mykrolis shall take all appropriate
measures at Mykrolis's expense to promptly and diligently to enforce the terms
of any

                                       5
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sublicense agreement or other agreement with any Subsidiary and shall restrain
any such Subsidiary from violating such terms, including without limitation (i)
monitoring the Subsidiaries' compliance with the relevant confidentiality
obligations of this Agreement and causing any noncomplying Subsidiary promptly
to remedy any failure, (ii) terminating such agreement and/or (iii) commencing
legal action, in each case, using a standard of care consistent with MIL's
practices as of the Separation Date. In the event that MIL determines that
Mykrolis has failed promptly and diligently to enforce the terms of any such
agreement using such standard of care, MIL reserves the right to enforce such
terms, and Mykrolis shall reimburse MIL for its fully allocated direct costs and
expenses incurred in enforcing such agreement, plus all out-of-pocket costs and
expenses, plus five percent (5%).

                                   ARTICLE 5
                               MYKROLIS LICENSES

     5.1 LICENSE GRANT.  Mykrolis grants to MIL a personal, exclusive,
worldwide, fully-paid and non-transferable (except as set forth in Section 13.9)
license to use the Mykrolis Licensed Know-How in the MIL Field of Use.

     5.2 LICENSE RESTRICTIONS.

          (a) MIL may not make any use whatsoever, in whole or in part, of the
Mykrolis Licensed Know-How, in connection with MIL, doing business as, or in a
fictitious name, or in association with a Third Party without the prior written
consent of Mykrolis, except as expressly set forth in section 5.1 above.

     5.3 LICENSE UNDERTAKINGS.  As a condition to the licenses granted
hereunder, MIL undertakes to Mykrolis that:

          (a) MIL shall not use the Mykrolis Licensed Know-How in any manner
which is inconsistent with the terms of this Agreement or which compromises or
which might jeopardize or limit Mykrolis's proprietary interest therein.

          (b) MIL shall not use the Mykrolis Licensed Know-How in connection
with any products or services except in the MIL Field of Use.

          (c) Mykrolis shall not (i) misrepresent to any Person the scope of its
authority under this Agreement, (ii) incur or authorize any expenses or
liabilities chargeable to Mykrolis or (iii) take any actions that would impose
upon Mykrolis any obligation or liability to a Third Party other than
obligations under this Agreement, or other obligations which Mykrolis expressly
approves in writing for MIL to incur on their behalf.

                                       6
<PAGE>

     5.4  RESERVATION OF RIGHTS. Except as otherwise expressly provided in this
Agreement, Mykrolis shall retain all rights in and to the Mykrolis Licensed
Know-How, including without limitation:

     (a) All rights of ownership in and to the Mykrolis Licensed Know-How;

     (b) The right to use (including the right of Mykrolis's Subsidiaries to
use) the Mykrolis Licensed Know-How, in connection with the marketing, offer or
provision of any product or service so long as any such products or service are
not in the MIL Field of Use; and

     (c) The right to license Third Parties to use the Mykrolis Licensed Know-
How, so long as any such products or service are not in the MIL Field of Use.

                                   ARTICLE 6
                           MIL PERMITTED SUBLICENSES

     6.1  SUBLICENSES TO SUBSIDIARIES.  Subject to the terms and conditions of
this Agreement, MIL may grant sublicenses to its Subsidiaries to use the
Mykrolis licensed Know-How in accordance with the license grant in Section 5.1
above; provided that (i) MIL enters into a written sublicense agreement with
each such Subsidiary sublicensee, and (ii) such agreement does not include the
right to grant further sublicenses.  MIL shall provide copies of such written
sublicense agreements to Mykrolis upon request.  If MIL grants any sublicense
rights pursuant to this Section 6.1 and any such sublicensed Subsidiary ceases
to be a Subsidiary, then the sublicense granted to such Subsidiary pursuant to
this Section 6.1 shall terminate 180 days from the date of such cessation.

     6.2  ENFORCEMENT OF AGREEMENTS.  MIL shall take all appropriate measures at
MIL's expense to promptly and diligently to enforce the terms of any sublicense
agreement or other agreement with any Subsidiary and shall restrain any such
Subsidiary from violating such terms, including without limitation (i)
monitoring the Subsidiaries' compliance with the relevant confidentiality
obligations of this Agreement and causing any noncomplying Subsidiary promptly
to remedy any failure, (ii) terminating such agreement and/or (iii) commencing
legal action, in each case, using a standard of care consistent with MIL's
practices as of the Separation Date.  In the event that Mykrolis determines that
MIL has failed promptly and diligently to enforce the terms of any such
agreement using such standard of care, Mykrolis reserves the right to enforce
such terms, and MIL shall reimburse Mykrolis for its fully allocated direct
costs and expenses incurred in enforcing such agreement, plus all out-of-pocket
costs and expenses, plus five percent (5%).

                                       7
<PAGE>

                                   ARTICLE 7
                                CONFIDENTIALITY

     7.1  CONFIDENTIALITY AND NON-USE OBLIGATIONS. During the term of this
Agreement, each party shall (i) protect the Licensed Know-How by using the same
degree of care, but no less than a reasonable degree of care, to prevent the
unauthorized use, dissemination, or publication of the Licensed Know-How as it
uses to protect its own confidential information of a like nature, (ii) not use
the Licensed Know-How in violation of any use restriction in any Transaction
Agreement, and (iii) not disclose the Licensed Know-How to any Third Party,
except as expressly permitted under this Agreement, in the Transaction
Agreements or in any other agreements entered into between the parties in
writing, without prior written consent of the licensing party.

    7.2  EXCLUSIONS FROM CONFIDENTIALITY. Notwithstanding the foregoing
provisions of this Section 7.1, the obligations of confidentiality and non-use
shall not apply to Know-How that: (i) was in the receiving party's possession
before receipt from MIL and obtained from a source other than MIL and other than
through the prior relationship of MIL and Mykrolis before the Separation Date;
(ii) is or becomes a matter of public knowledge through no fault of the
receiving party; (iii) is rightfully received by the receiving party from a
Third Party without a duty of confidentiality; (iv) is disclosed by the
disclosing party to a Third Party without a duty of confidentiality on the Third
Party; (v) is independently developed by the receiving by one who has not access
to or been advised of the Licensed Know-How; or (vi) is disclosed by the
receiving party with the disclosing party's prior written approval.

     7.3  DISCLOSURE TO SUBSIDIARY . Each party has the right to disclose to
its Subsidiary under Articles 4 and 6 respectively such portions of the Licensed
Know-How as is reasonably necessary in the exercise of the Subsidiary to perform
its assigned tasks within the licensed Fields of Use, subject to the
Subsidiary's agreement in writing to confidentiality and non-use terms at least
as protective of the Licensed Know-How as the provisions of this Article 7.

     7.4  CONTRACE MANUFACTURERS. Each party has the right to disclose to its
contract manufacturers such portions of the Licensed Know-How as is reasonably
necessary in the exercise of the receiving party's "have made" rights, subject
to the contract manufacturer's agreement in writing to confidentiality and non-
use terms at least as protective of the Licensed Know-How as the provisions of
this Article 7.

     7.5  COMPELLED DISCLOSURE. If the receiving party or any of its respective
sublicensed Subsidiaries believes that it will be compelled by a court or other
authority of competent jurisdiction to disclose any of the Licensed Know-How, it
shall (i) give the disclosing party prompt written notice so that disclosing
party may take steps to oppose such disclosure, and (ii) cooperate with
disclosing party in its attempts to oppose such disclosure. If the receiving
party complies with the above, it shall not be prohibited from complying with
such requirement to disclose, but shall take all reasonable steps to make such
disclosure subject to a suitable protective order, limit the scope of the
disclosure and otherwise prevent unrestricted or public disclosure.

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<PAGE>

     7.6 NO RESTRICTION. Nothing in this Agreement shall restrict either
party from using, disclosing, or disseminating the Know-How owned by it in any
way.

     7.7 THIRD PARTY RESTRICTIONS Nothing in the Agreement supersedes any
restriction imposed by Third Parties on their Confidential Information, and
there is no obligation on the Disclosing Party to conform Third Party agreements
to the terms of this Agreement.

                                   ARTICLE 8
                        PROTECTION OF LICENSED KNOW-HOW

     8.1 OWNERSHIP AND RIGHTS. To the extent not contrary to applicable
law, the parties agree not to challenge the ownership or validity of the
Licensed Know-How. The receiving party's use of the Licensed Know-How is by
license only and it shall not acquire or assert any rights of ownership therein.

     8.2 PROTECTION OF KNOW-HOW. The receiving party's will not grant or
attempt to grant a security interest in the Licensed Know-How, or to record any
such security interest in the United States Patent and Trademark Office or
elsewhere, against any of the Licensed Know-How.

     8.3 INFRINGEMENT PROCEEDINGS. In the event that the receiving party's
Patent Counsel learns of any disclosure or misappropriation or threatened
disclosure or misappropriation of the Licensed Know-How, the receiving party's
shall notify the disclosing party or its authorized representative giving
particulars thereof, and the receiving party shall provide any necessary
information and assistance to the disclosing party or its authorized
representatives at the receiving party's expense in the event that the
disclosing party decides that proceedings should be commenced. The disclosing
party shall have exclusive control of any litigation or related legal
proceedings, relating to the disclosure or misappropriation of the Licensed
Know-How. The decision whether to bring, maintain or settle any such proceedings
shall be at the exclusive option and expense of the disclosing party, and all
recoveries shall belong exclusively to the disclosing party. The receiving party
shall not and shall have no right to initiate any such litigation or related
legal proceedings in its own name, but, at the disclosing party' s request,
agrees to be joined as a party in any action taken by the disclosing party to
enforce its rights in the Licensed Know-How. The disclosing party shall incur no
liability to the receiving party or any other Person under any legal theory by
reason of the disclosing party's failure or refusal to prosecute or by the
disclosing party's refusal to permit the receiving party to prosecute, any
alleged disclosure or misappropriation, nor by reason of any settlement to which
the disclosing party may agree.

                                       9
<PAGE>

                                   ARTICLE 9
                                  TERMINATION

     9.1  TERM.  This Agreement shall remain in effect for so long as the
Licensed Know-How is kept confidential and is used by the receiving party in the
receiving party's Field of Use unless earlier terminated as provided below in
9.2.

     9.2  VOLUNTARY TERMINATION.  By written notice to MIL, the receiving party
may voluntarily terminate the licenses and rights granted to it hereunder by
MIL.  Such notice shall specify the effective date of such termination.

     9.3  SURVIVAL.  Any termination of licenses and rights of the receiving
party under Section 9.2 shall not affect the receiving party's licenses and
rights with respect to any products made or sold prior to such termination in
the receiving party's Field of Use.

     9.4  OTHER TERMINATION.   This Agreement, the Master Separation Agreement
and all other Ancillary Agreements may be terminated at any time prior to the
IPO Closing Date by and in the sole discretion of MIL without the approval of
Mykrolis.  This Agreement may be terminated at any time after the IPO Closing
Date and before the Distribution Date by mutual consent of MIL and Mykrolis.  In
the event of termination pursuant to this Section 9.4, no party shall have any
liability of any kind to the other party.

                                   ARTICLE 10
                       TRANSFER AND IMPARTING OF KNOW-HOW

     10.1 COMMITMENT TO TRANSFER KNOW-HOW. Both Parties agree to transfer and
impart to the other the Know-How assigned or licensed to the other under the
terms of this Agreement so that the other Party is capable of exercising and
practicing the Know-How in conjunction with the manufacture and sale of its
products as of the Separation Date.

     10.2 DELIVERY OF DOCUMENTATION, ETC. Each party agrees to transfer and
deliver to the other, all documentation including technical information and
data, documents, drawings, production drawings, test specifications, material
specifications and other information which is written, printed, or recorded in
electronic media format relating to the specifications, designs, formulae,
processes, procedures necessary or helpful for or directly related to the
design, manufacture, assembly and processing of its Products and the practice of
its Know-How.

     10.3 FORMAT OF DOCUMENATION. It is expressly agreed and understood that
all documentation to be transferred and delivered pursuant to this Section 10.1
shall be in the format in which it exists as of the Separation Date. Neither
party shall be required to supplement, adapt or reform any of such documentation
for the other. In the event that the format of any such documentation is
inadequate to effectively transfer and impart the Know-How to the other, then
the parties agree to cooperate with each other to jointly

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develop alternative documentation or reformat existing documentation so that it
shall be effective to transfer and impart the Know-How.

     10.4  TRAINING OF EMPLOYEES. In order to support the transfer and imparting
of the Know-How, each agrees to make available to the other on a direct cost
basis such of its engineering, technical and production personnel as shall be
necessary and appropriate in order to train, advise, consult with, and discuss
the practice of the Know-How in order to assist in the implementation and
absorption of the Know-How by the appropriate personnel. Each party agrees to
make such personnel available to the other upon written request during the first
twelve (12) months following the Separation Date at times and for periods
acceptable to each other.

                                  ARTICLE 11
                              DISPUTE RESOLUTION

     11.1  USE AND INITIATION OF PROCEDURE. In the event of a dispute between
the parties arising out of or related to this Agreement (the "Dispute"), the
parties hereto agree to use the alternative dispute resolution procedures
specified in this section (the "Procedure") in good faith in order to resolve
such dispute. The Procedure may be modified by written agreement of the parties
at the time the Dispute arises. A party seeking to initiate the Procedure shall
give written notice to the other party, describing briefly the nature of the
dispute and its claim and identifying an individual with authority to settle the
dispute on its behalf. The party receiving such notice shall have five (5) days
within which to designate, in a written notice given to the initiating party, an
individual with authority to settle the dispute on its behalf. Neither of such
authorized individuals shall have had direct substantive involvement in the
matters involved in the Dispute.

     11.2  Unassisted Settlement. The authorized individuals shall make such
investigation as they deem appropriate and thereafter promptly (but in no event
later than thirty (30) days from the date of the initiating party's notice)
shall commence discussions concerning resolution of the Dispute. If the Dispute
has not been resolved within thirty (30) days from the commencement of
discussions, it shall be submitted to alternative dispute resolution ("ADR") in
accordance with the provisions of Sections 11.3 through 11.10 hereof.

     11.3  Selection of Neutral. The parties shall have ten (10) days following
the submission of the Dispute to ADR in accordance with Section 11.2 above to
agree upon a mutually-acceptable person not affiliated with either of the
parties (the "Neutral"). If no Neutral has been selected within such time, the
parties agree jointly to request the American Arbitration Association, the
Center for Public Resources, or another mutually agreed-upon provider of neutral
services to supply within ten (10) days a list of potential Neutrals with
qualifications as specified by the parties in the joint request. Within five (5)
days of receipt of the list, the parties shall independently rank the proposed
candidates, shall simultaneously exchange rankings, and shall select as the
Neutral the individual receiving the highest combined ranking who is available
to serve.

                                       11
<PAGE>

     11.4   Time and Place for ADR. In consultation with the Neutral, the
parties shall promptly designate a mutually convenient time and place for the
ADR (and unless circumstances require otherwise, such time to be not later than
forty-five (45) days after selection of the Neutral).

     11.5   Exchange of Information. In the event either of the parties has
substantial need for information in the possession of the other party in order
to prepare for the ADR, the parties shall attempt in good faith to agree on
Procedures for the expeditious exchange of such information, with the help of
the Neutral if required.

     11.6   Summary of Views. One week prior to the first scheduled session of
the ADR, each party shall deliver to the Neutral and to the other party a
concise written summary of its views on the matter in Dispute.

     11.7   Staffing the ADR. In the ADR, each party shall be represented by the
authorized individual and by counsel. In addition, each party may bring such
additional persons as needed to respond to questions, contribute information and
participate in the negotiations, the number of such additional persons to be
agreed upon by the parties in advance, with the assistance of the Neutral, if
necessary.

     11.8   Conduct of ADR. The parties, in consultation with the Neutral, will
agree upon a format for the meetings, designed to assure that both the Neutral
and the authorized individuals have an opportunity to hear an oral presentation
of each party's views on the matter in Dispute, and that the authorized parties
attempt to negotiate a resolution of the matter in Dispute, with or without the
assistance of counsel or others, but with the assistance of the Neutral. To this
end, the Neutral is authorized to conduct both joint meetings and separate
private caucuses with the parties. The Neutral will keep confidential all
information learned in private caucus with either party unless specifically
authorized by such party to make disclosure of the information to the other
party.

     11.9   The Neutral's Views. The Neutral (i) shall, unless requested not to
do so by both parties, provide his opinion to both parties on the probable
outcome should the matter be litigated, and (ii) shall make one or more
recommendations as to the terms of a possible settlement, upon any conditions
imposed by the parties (including, but not limited to, a minimum and maximum
amount). The Neutral shall base his opinions and recommendations on information
available to both parties, excluding such information as may be disclosed to him
by the parties in confidence. The opinions and recommendations of the Neutral
shall not be binding on the parties.

     11.10  Termination of Procedure. The parties agree to participate in the
ADR in good faith to its conclusion (as designated by the Neutral) and not to
terminate negotiations concerning resolution of the matters in Dispute until at
least ten (10) days thereafter. Each party agrees not to commence any other
proceeding or to seek other remedies prior to the conclusion of the ten-day
post-ADR negotiation period; provided, however, that either party may commence
                             --------  -------
litigation within five (5) days prior to the date after which the commencement
of litigation could be barred by an applicable statute of limitations or in
order to request an injunction to prevent irreparable harm, in which event,

                                       12
<PAGE>

the parties agree (except as prohibited by court order) to nevertheless continue
to participate in the ADR to its conclusion.

     11.11  Fees of Neutral; Disqualification. The fees of the Neutral shall be
shared equally by the parties. The Neutral shall be disqualified as a witness,
consultant, expert or counsel for either party with respect to the matters in
Dispute and any related matters in any subsequent litigation or other proceeding
with respect to the Dispute.

     11.12  Confidentiality. The parties agree that the Procedure and the ADR
are compromise negotiations for purposes of the Federal Rules of Evidence and
the Rules of Evidence of any state of competent jurisdiction. The entire of the
Procedure and the ADR are confidential, and no stenographic, visual or audio
record shall be made. All conduct, statements, promises, offers, views and
opinions, whether oral or written, made in the course of the Procedure or the
ADR by either of the parties, their agents, employees, representatives, or other
invitees and by the Neutral (who will be the parties' joint agent for purposes
of these compromise negotiations) are confidential and shall, in addition and
where appropriate, be deemed to be work product and privileged. Such conduct,
statements, promises, offers, views and opinions shall not be discoverable or
admissible for any purposes, including impeachment, in any litigation or other
proceeding involving the parties, and shall not be disclosed to anyone not an
agent, employee, expert, witness, or representative of either of the parties;
provided, however, that evidence otherwise discoverable or admissible is not
--------  -------
excluded from discovery or admission as a result of its use in the ADR.

     11.13  Arbitration. Any Dispute which the parties cannot resolve through
mediation within ninety (90) days following the commencement of the Procedure,
unless otherwise mutually agreed, shall be submitted to final and binding
arbitration under the then current Commercial Arbitration Rules of he American
Arbitration Association ("AAA"), by three (3) arbitrators in Boston,
Massachusetts. Such arbitrators shall be selected by the mutual agreement of the
parties or, failing such agreement, shall be selected according to the aforesaid
AAA rules. The arbitrators will be instructed to prepare and deliver a written,
reasoned opinion stating their decision within thirty (30) days of the
completion of the arbitration. The prevailing party in such arbitration shall be
entitled to expenses, including costs and reasonable attorneys' and other
professional fees, incurred in connection with the arbitration (but excluding
any costs and fees associated with prior ADR, negotiation or mediation). The
decision of the arbitrator shall be final and non-appealable and may be enforced
in any court of competent jurisdiction. The use of any ADR procedures will not
be construed under the doctrine of laches, waiver or estoppel to adversely
affect the rights of either party.

     11.14  Continuity of Service and Performance. Unless otherwise agreed in
writing, the parties will continue to provide service and honor all other
commitments under this Agreement and each Ancillary Agreement during the course
of dispute resolution pursuant to the provisions of this Article 8 with respect
to all matters not subject to such dispute, controversy or claim.

                                       13
<PAGE>

                                  ARTICLE 12
                            LIMITAITON OF LIABILITY

     IN NO EVENT SHALL EITHER PARTY OR ITS SUBSIDIARIES BE LIABLE TO THE OTHER
PARTY OR ITS SUBSIDIARIES FOR ANY SPECIAL, CONSEQUENTIAL, INDIRECT, INCIDENTAL
OR PUNITIVE DAMAGES OR LOST PROFITS OR ANY OTHER DAMAGES, HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY (INCLUDING NEGLIGENCE) ARISING IN ANY WAY OUT OF THIS
AGREEMENT, WHETHER OR NOT SUCH PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES; PROVIDED, HOWEVER, THAT THE FOREGOING LIMITATIONS SHALL NOT LIMIT EACH
PARTY'S OBLIGATIONS EXPRESSLY ASSUMED IN THE MASTER SEPARATION AND DISTRIBUTION
AGREEMENT; PROVIDED FURTHER THAT THE EXCLUSION OF PUNITIVE DAMAGES SHALL APPLY
IN ANY EVENT.

                                  ARTICLE 13
                           MISCELLANEOUS PROVISIONS

     13.1   DISCLAIMER. EACH PARTY ACKNOWLEDGES AND AGREES THAT ALL LICENSED
KNOW-HOW AND ANY OTHER INFORMATION OR MATERIALS LICENSED OR PROVIDED HEREUNDER
ARE LICENSED OR PROVIDED ON AN "AS IS" and "WHERE IS" BASIS AND THAT NEITHER
PARTY NOR ANY OF ITS SUBSIDIARIES MAKE ANY REPRESENTATIONS OR EXTENDS ANY
WARRANTIES WHATSOEVER, EXPRESS, IMPLIED OR STATUTORY, WITH RESPECT THERETO
INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF TITLE, ENFORCEABILITY OR
NON-INFRINGEMENT. Without limiting the generality of the foregoing, MIL makes no
warranty or representation as to the validity of any Assigned Know-How; and both
parties make no any warranty or representation that any use of any Licensed
Know-How with respect to any product or service will be free from infringement
of any rights of any Third Party.

     13.2   NO IMPLIED LICENSES. Nothing contained in this Agreement shall be
construed as conferring any rights by implication, estoppel or otherwise, under
any intellectual property right, other than the rights expressly granted in this
Agreement with respect to the Licensed Know-How. Neither party is required
hereunder to furnish or disclose to the other any information (including copies
of the Know-How), except as specifically provided herein.

     13.3   INFRINGEMENT SUITS. Neither party shall have any obligations
hereunder to institute any action or suit against Third Parties for
misappropriation of any of the Licensed Know-How or to defend any action or suit
brought by a Third Party which challenges or concerns the validity of any of the
Licensed Know-How and the receiving party shall not have any right to institute
any action or suit against Third Parties for infringement of any of the Licensed
Know-How.

     13.4   NO OTHER OBLIGATIONS. NEITHER PARTY ASSUMES ANY RESPONSIBILITIES OR
OBLIGATIONS WHATSOEVER, OTHER THAN THE RESPONSIBILITIES AND OBLIGATIONS
EXPRESSLY SET FORTH IN THIS

                                       14
<PAGE>

AGREEMENT OR A SEPARATE WRITTEN AGREEMENT BETWEEN THE PARTIES, IN PARTICULAR,
MIL IS NOT REQUIRED TO PROVIDE ANY ACCESS TO THE MIL NON-LICENSED KNOW-HOW TO
MYKROLIS. Without limiting the generality of the foregoing, neither party, nor
any of its Subsidiaries is obligated to (i) provide copies of any Licensed Know-
How that may exist, (ii) to furnish any improvements to the Licensed Know-How or
new Know-How developed after the Separation Date, or (iii) provide any
assistance in the use or understanding of the Licensed Know-How, except for the
obligations expressly assumed in this Agreement.

     13.5   ENTIRE AGREEMENT. This Agreement, the Separation and Distribution
Agreement and the other Ancillary Agreements (as defined in the Separation and
Distribution Agreement) and the Exhibits and Schedules referenced or attached
hereto and thereto constitute the entire agreement between the parties with
respect to the subject matter hereof and thereof and shall supersede all prior
written and oral and all contemporaneous oral agreements and understandings with
respect to the subject matter hereof and thereof. To the extent there is a
conflict between this Agreement and the General Assignment and Assumption
Agreement between the parties, the terms of this Agreement shall govern.

     13.6   GOVERNING LAW. This Agreement shall be construed in accordance with
and all Disputes hereunder shall be governed by the laws of the Commonwealth of
Massachusetts as applied to transactions taking place wholly within
Massachusetts between Massachusetts residents. The Superior Court of Middlesex
County and/or the United States District Court for the District of Massachusetts
shall have jurisdiction and venue over all Disputes between the parties that are
permitted to be brought in a court of law pursuant to Article 11 above.

     13.7   DESCRIPTIVE HEADINGS. The headings contained in this Agreement, in
any Exhibit or Schedule hereto and in the table of contents to this Agreement
are for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement. Any capitalized term used in any Exhibit or
Schedule but not otherwise defined therein, shall have the meaning assigned to
such term in this Agreement. When a reference is made in this Agreement to an
Article or a Section, Exhibit or Schedule, such reference shall be to an Article
or Section of, or an Exhibit or Schedule to, this Agreement unless otherwise
indicated.

     13.8   NOTICES. Notices, offers, requests or other communications required
or permitted to be given by either party pursuant to the terms of this Agreement
shall be given in writing to the respective parties to the following addresses:

                    if to MIL:

                                   Millipore Corporation
                                   80 Ashby Road
                                   Bedford, Massachusetts 01730

                                       15
<PAGE>

                    With a copy to:

                                   General Counsel
                                   Millipore Corporation
                                   80 Ashby Road
                                   Bedford, Massachusetts 01730

                    if to Mykrolis:

                                   Mykrolis Corporation
                                   Patriots Park
                                   Bedford, Massachusetts 01730

                    With a copy to:

                                   General Counsel
                                   Mykrolis Corporation
                                   Patriots Park
                                   Bedford, Massachusetts

Or to such other address as the party to whom notice is given may have
previously furnished to the other in writing as provided herein.  Any notice
involving non-performance, termination, or renewal shall be sent by hand
delivery, recognized overnight courier or, within the United States, may also be
sent via certified mail, return receipt requested.  All other notices shall be
deemed to have been given and received on the earlier of actual delivery or
three (3) days from the date of postmark.

     13.9   NONASSIGNABILITY. Mykrolis may not, directly or indirectly, in whole
or in part, whether by operation of law or otherwise, assign or transfer this
Agreement, without the MIL's prior written consent, and any attempted
assignment, transfer or delegation without such prior written consent shall be
voidable at the sole option of MIL. Notwithstanding the foregoing, Mykrolis (or
its permitted successive assignees or transferees hereunder) may assign or
transfer this Agreement as a whole without consent to a Person that succeeds to
all or substantially all of the business or assets of Mykrolis as long as such
Person agrees to accept all the terms and conditions set forth herein. Without
limiting the foregoing, this Agreement will be binding upon and inure to the
benefit of the parties and their permitted successors and assigns.

     13.10  SEVERABILITY. If any term or other provision of this Agreement is
determined by a court, administrative agency or arbitrator to be invalid,
illegal or incapable of being enforced by any rule or law or public policy, all
other conditions and provisions of this Agreement shall nevertheless remain in
full force and effect so long as the economic or legal substance of the
transactions contemplated hereby is not affected in any manner materially
adverse to either party. Upon such determination that any term or other
provision is invalid, illegal or incapable of being enforced, the parties hereto
shall negotiate in good faith to modify this Agreement so as to effect the
original intent of the parties as closely as possible in an acceptable manner to
the end that the transactions contemplated hereby are fulfilled to the fullest
extent possible.

                                       16
<PAGE>

     13.11  FAILURE OR INDULGENCE NOT WAIVER; REMEDIES CUMULATIVE. No failure or
delay on the part of either party hereto in the exercise of any right hereunder
shall impair such right or be construed to be a waiver of, or acquiescence in,
any breach of any representation, warranty or agreement herein, nor shall any
single or partial exercise of any such right preclude other or further exercise
thereof or of any other right. All rights and remedies existing under this
Agreement are cumulative to, and not exclusive of, any rights or remedies
otherwise available.

     13.12  AMENDMENT. No change or amendment will be made to this Agreement
except by an instrument in writing signed on behalf of each of the parties to
such Agreement.

     13.13  COUNTERPARTS. This Agreement, including the Ancillary Agreements and
the Exhibits and Schedules hereto and thereto and the other documents referred
to herein or therein, may be executed in counterparts, each of which shall be
deemed to be an original but all of which shall constitute one and the same
agreement.

     13.14  AUTHORITY. Each of the parties hereto represents to the other that
(a) it has the corporate or other requisite power and authority to execute,
deliver and perform this Agreement, (b) the execution, delivery and performance
of this Agreement by it have been duly authorized by all necessary corporate or
other actions, (c) it has duly and validly executed and delivered this
Agreement, and (d) this Agreement is a legal, valid and binding obligation,
enforceable against it in accordance with its terms subject to applicable
bankruptcy, insolvency, reorganization, moratorium or other similar laws
affecting creditors' rights generally and general equity principles.

     WHEREFORE, the parties have signed this Master Trade Secret and Know-How
License Agreement effective as of the date first set forth above.

Millipore Corporation                   Mykrolis Corporation

By: /s/ Francis J. Lunger               By: /s/ Jean-Marc Pandraud
   ----------------------                  -----------------------

Name: Francis J. Lunger                 Name: Jean-Marc Pandraud
     ----------------------                  -------------------

Title: Executive Vice President         Title: President
      -------------------------               ----------

                                       17
<PAGE>

                                   EXHBIIT A
                    TO TRADE SECRET and KNOW-HOW AGREEMENT

                              See Zip Drive Disk
                              ---

                                       18
<PAGE>

                                   EXHIBIT B
                    TO TRADE SECRET and KNOW-HOW AGREEMENT

                                     None

                                       19
<PAGE>

                                   EXHBIIT C
                    TO TRADE SECRET and KNOW-HOW AGREEMENT

                                     None

                                       20

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