Document:

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                                  Exhibit 10.06

                     SECOND AMENDMENT TO AGREEMENT OF LEASE

            AGREEMENT made as of the 24 day of March, 2003, by and between
COMMERCE PARK REALTY, LLC, a Connecticut limited liability company having an
address at 7 Finance Drive, Danbury, Connecticut 06810 ("LESSOR") and ADVANCED
TECHNOLOGY MATERIALS, INC., a Delaware corporation having an address at 7
Commerce Drive, DANBURY, Connecticut 068 10 ("LESSEE").

                                    RECITALS

            A. Lessee has leased certain land and improvements known as 7
Commerce Drive, Danbury, Connecticut (the "LEASED PREMISES"), pursuant to a
lease dated December 23, 1994 between Melvyn J. Powers and Mary P. Powers, d/b/a
M&M Realty, as original lessor, and Lessee, as lessee (the "ORIGINAL LEASE") as
amended by First Amendment To Agreement Of Lease between Lessor and Lessee dated
as of November 22, 2000 (the "FIRST AMENDMENT"; collectively with the Original
Lease referred to herein as the "LEASE").

            B. Lessee has requested that Lessor agree to extend the initial term
of the Lease for an additional two (2) year period.

            C. As a condition to granting its consent to Lessee's request,
Lessor requires that the Lease be modified in accordance with the terms of this
Agreement.

            D. In consideration of the foregoing, and for One Dollar ($1.00) and
other valuable consideration received by each to their satisfaction, Lessor and
Lessee hereby agree as follows:

                                    AGREEMENT

            1. Lessor and Lessee hereby agree that the initial term of the Lease
shall end on June 30, 2008. All references in the Lease and herein to the "Term"
shall be deemed to mean the period commencing on the Commencement Date (as
defined in the Lease) and ending on June 30, 2008.

            2. Lessee agrees that the current annual Fixed Rent of Four Hundred
Eighty-Five Thousand Seven Hundred Two and 67/100 Dollars ($485,702.76), which
is payable in advance in equal monthly installments of Forty Thousand Four
Hundred Seventy-Five Dollars and 23/100 ($40,475.23), shall be payable for the
remainder of the Term, as the Term has been extended hereby.

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            3. Due to the extension of the Term to June 30, 2008, as described
in PARAGRAPH 1 above, the First Renewal Term (as defined in the First Amendment)
shall commence on July 1, 2008 and terminate on June 30, 2013. The Second
Renewal Term (as defined in the First Amendment) shall commence on July 1, 201 3
and terminate on June 30, 2018.

            4. Except as specifically modified hereby, all of the terms and
conditions of the Lease remain in full force and effect.

            5. This Agreement shall be binding upon, and inure to the benefit
of, Lessor and Lessee and their respective successors, heirs and assigns.

            6. This Agreement shall be construed in accordance with the laws of
the State of Connecticut.

            7. This Agreement may not be changed or modified, in whole or in
part, except by written instrument executed by the party against whom
enforcement of such change or modification is sought.

            IN WITNESS WHEREOF, Lessor and Lessee have executed this Agreement
as of the day and date first above written.

                             LESSOR:

                             COMMERCE PARK REALTY, LLC

                             By: Commerce Park Management Company
                                 Its Manager

                                 By: MELVYN J. POWERS
                                     ----------------
                                     Its President

                             LESSEE:

                             ADVANCED TECHNOLOGY MATERIALS, INC.

                             By:  DANIEL P. SHARKEY
                                  -----------------
                                  Its Vice President and Chief Financial Officer<PAGE>

                                  Exhibit 10.19
                                                                       CONFORMED

                                   ATMI, INC.

              NON-EMPLOYEE DIRECTORS DEFERRED COMPENSATION PROGRAM
                          OF ATMI, INC. 1998 STOCK PLAN

                                    ARTICLE 1

                                     GENERAL

1.1      NAME AND PURPOSE.

          The purpose of the Non-Employee Directors Deferred Compensation
Program (the "Program") is to provide Awards under the 1998 Stock Plan (the
"Plan") of ATMI, Inc., a Delaware corporation, to Non-Employee Directors of the
Company as a vehicle to defer receipt of all retainers and meeting fees paid to
Non-Employee Directors, and to permit such deferred amounts to be credited to
Stock Accounts, established at the time of each deferral, equivalent to shares
of the Company's Common Stock, at prices contemporaneous with each deferral
date.

1.2      DEFINITIONS.

         Whenever used herein, all capitalized terms not defined herein shall
have the meaning set forth in the Plan and the following terms shall have the
meaning set forth or referenced below:

          (a)      "Board" means the Board of Directors of the Company.

          (b)      "Business Day" means a day except for a Saturday, Sunday or a
                   legal holiday in the State of Connecticut.

          (c)      "Common Stock" means (i) the common stock of the Company,
                   adjusted as provided in Section 3.5, or (ii) if there is a
                   merger or consolidation and the Company is not the surviving
                   corporation thereof, the capital stock of the surviving
                   corporation given in exchange for such common stock of the
                   Company.

          (d)      "Compensation" means retainer fees for service on, and fees
                   for attendance at meetings of, the Board and any committees
                   thereof, which are payable to a Non-Employee Director during
                   a Program Year.

          (e)      "Deferral Date" means any Business Day during a Program year
                   on which fees are paid, as determined by the Board, to
                   Non-Employee Directors in connection with their services on
                   the Board, including, without limitation, retainer fees,
                   committee services fees, or meeting fees.

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          (f)      "Non-Employee Director" means any individual serving on the
                   Board who is not an employee of the Company or any of its
                   subsidiaries or affiliates.

          (g)      "Program" has the meaning set forth in Section 1.1 above.

          (h)      "Program Year" means the calendar year.

          (i)      "Stock Account" means a bookkeeping account established for
                   each Participant pursuant to the terms hereof consisting of
                   Stock Credits.

          (j)      "Stock Credit" means a credit to a Stock Account representing
                   shares of Common Stock, calculated pursuant to Article 2.

          (k)      "Stockholders' Meeting" means the Annual Meeting of
                   Stockholders of the Company.

                                    ARTICLE 2

                                  FEE DEFERRALS

2.1      ELIGIBILITY.

         Effective beginning on the first day of January 2001, each
Non-Employee Director serving on such date or at any time thereafter shall be
eligible to participate, and shall participate, in the Program.

2.2      GRANT OF STOCK CREDITS.

         Effective on the first day of January 2001, each person who serves as
a Non-Employee Director shall have his or her Stock Account credited with Stock
Credits as herein described. Any person who becomes a Non-Employee Director at
any time thereafter shall have his or her Stock Account credited with Stock
Credits as herein described. Stock Credits with respect to Compensation shall be
established on each Deferral Date in any amount equal to the (A) Compensation
which would have been paid to a Participant on such Deferral Date but for such
Participant's election to defer all or a portion of such Compensation pursuant
to the Program, divided by (B) the Fair Market Value of the Common Stock on the
Deferral Date.

2.3      DIVIDENDS.

         As of the date any dividend is paid to holders of shares of Common
Stock, such Stock Account shall be credited with additional Stock Credits equal
to (A) the amount which would have been paid as dividends on that number of
shares (including fractions of a share) of Common Stock equal to the number of
Stock Credits attributed to such Stock Account on the record date for such
dividend payment, divided by (B) the Fair Market Value of the Common Stock on
the dividend payment date. In the case of dividends paid in property other than
cash, the amount of the dividend shall be deemed to be the fair market value of
the property at the time of the payment of the dividend, as determined in good
faith by the Committee.

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                                    ARTICLE 3

                            DISTRIBUTION OF ACCOUNTS

3.1      TIME AND METHOD OF PAYMENT.

         Distribution of the Stock Account of a Participant shall be made by the
last Business Day of the first calendar month following such Participant's
termination of service as a director of the Company. Distribution of a
Participant's Stock Account shall be made, subject to Section 3.4, in a single
installment in that number of shares of Common Stock as is equal to the number
of Stock Credits in the Participant's Stock Account on the date of distribution,
except that the value of any fractional share shall be paid in cash based on the
Fair Market Value of the Common Stock on the date of distribution.

3.2      SEVERE FINANCIAL HARDSHIP.

         Notwithstanding any other Section of this Article 3, at the written
request of a Participant or a Participant's legal representative, the Committee,
in its sole discretion upon a finding that continued deferral will result in
severe financial hardship to the Participant, may authorize the payment of all
or a part of a Participant's Stock Account, subject to Section 3.4, in shares of
Common Stock, in a single installment prior to the distribution date for such
Stock Account under Section 3.1 or Section 3.3. Thereafter, Stock Credits shall
be credited to such Participant's Stock Account in accordance with Section 2.2
or Section 2.3.

3.3      DISTRIBUTION UPON DEATH.

         Notwithstanding any other provision of this Program, upon the death of
a Participant, the Committee shall authorize the Company to distribute, subject
to Section 3.4 hereof, all of such Participant's Stock Account in a single
installment to such person or persons, as the Participant may have designated.
All such designations shall be made in writing and delivered to the Committee. A
Participant may from time to time revoke or change any such designation by
written notice to the Committee. If there is no designation on file with the
Committee at the time of the Participant's death, or if the person or persons
designated therein shall have all predeceased the Participant or otherwise
ceased to exist, or if there is a dispute among designees of a Participant, such
distributions shall be made to the executor or administrator of the
Participant's estate. Any distribution under this Section 3.3 shall be made as
soon as practicable after the Committee is notified of the Participant's death
or is satisfied as to the identity of the appropriate payee, whichever is later.
Such distribution shall be made as provided in the second sentence of Section
3.1.

3.4      WITHHOLDING TAXES.

         If required by any applicable law, the Company shall deduct from all
distributions under the Plan any taxes required to be withheld by federal,
state, or local governments, computed on

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the basis of the Fair Market Value of the number of shares of Common Stock
otherwise distributable on the date of distribution.

3.5      ADJUSTMENT OF STOCK ACCOUNTS.

         If at any time the number of outstanding shares of Common Stock shall
be increased as the result of any stock dividend, stock split, subdivision or
reclassification of shares, the number of Stock Credits with which the Stock
Account of each Participant is credited shall be increased in the same
proportion as the outstanding number of shares of Common Stock is increased. If
the number of outstanding shares of Common Stock shall at any time be decreased
as the result of any combination, reverse stock split or reclassification of
shares, the number of Stock Credits with which the Stock Account of each
Participant is credited shall be decreased in the same proportion as the
outstanding number of shares of Common Stock is decreased. In the event a
dividend in kind is declared having a value per share of Common Stock equal to
10% or more of the Fair Market Value of a share of Common Stock on the Business
Day prior to the public announcement of such dividend, the Committee shall make
an appropriate equitable adjustment in the number of Stock Credits with which
the Stock Account of each Participant is credited. In the event the Company
shall at any time be consolidated with or merged into any other corporation and
holders of shares of Common Stock receive shares of the capital stock of the
resulting or surviving corporation (or any consideration other than shares of
capital stock), there shall be credited to the Stock Account of each
Participant, in place of the Stock Credits then credited thereto, new Stock
Credits in an amount equal to the product of the number of shares of capital
stock (or consideration other than shares of capital stock) exchanged for one
share of Common Stock upon such consolidation or merger and the number of Stock
Credits with which such Stock Account then is credited.

                                    ARTICLE 4

                                  THE COMMITTEE

4.1      AUTHORITY.

         The Committee shall have full power and authority to administer the
Program, including the power to (a) promulgate forms to be used with respect to
the Program, (b) promulgate rules of Program administration, (c) settle any
disputes as to rights or benefits arising from the Program, (d) interpret and
construe the terms of the Program, including, but not limited to, determining
entitlement to benefits and the amount of such benefits, and (e) make such
decisions or take such action as the Committee, in its sole discretion, deems
necessary or advisable to aid in the proper administration of the Program. Any
decision made by the Committee shall be final and binding on the Company,
Participants and their heirs or successors. The Committee may delegate its power
and authority to administer the Program to officers and employees of the
Company; provided, however, that the Committee's power and authority under
Section 3.2 (regarding Severe Financial Hardship) shall not be delegated.

                                       4

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4.2      OPERATION.

         The Committee may act (a) by majority vote of its members meeting in
person or by telephone, or (b) by consent in writing signed by all of the
members of the Committee.

4.3      ELECTIONS, NOTICES.

         All elections and notices required to be provided to the Committee
under the Program must be in such form or forms prescribed by, and contain such
information as is required by, the Committee.

                                    ARTICLE 5

                                  MISCELLANEOUS

5.1      FUNDING.

         All amounts payable under the Program shall constitute a general
unsecured obligation of the Company.

5.2      NON-ALIENATION OF BENEFITS.

         No benefit under the Program shall be subject in any manner to
anticipation, alienation, sale, transfer, assignment, pledge, encumbrance, or
charge, and any attempt to do so shall be void. No such benefit, prior to
receipt thereof pursuant to the provisions of the Program, shall be in any
manner liable for or subject to the debts, contracts, liabilities, engagements
or torts of the Participant.

5.3      GOVERNING LAW.

         This Program shall be governed by the laws of the State of Connecticut.

5.4      AMENDMENT, MODIFICATION AND TERMINATION OF THE PROGRAM.

         The Board at any time may terminate and in any respect amend or modify
the Program; provided, however, that no such termination, amendment or
modification shall adversely affect the rights of any Participant or
beneficiary, including his or her rights with respect to Stock Credits credited
prior to such termination, amendment or modification, without his or her
consent.

5.5      NON-FORFEITURABILITY OF STOCK CREDITS.

         No Stock Credits credited to the Stock Account of a Participant shall
be forfeitable for any reason.

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5.6      SUCCESSORS AND HEIRS.

         The Program and any properly executed elections hereunder shall be
binding upon the Company and Participants, and upon any assignee or successor in
interest to the Company and upon the heirs, legal representatives and
beneficiaries of any Participant.

5.7      STATUS OF PARTICIPANTS.

         Stock Credits are not, and do not constitute, shares of Common Stock.
No right as a holder of shares of Common Stock shall devolve upon a Participant
by reason of his or her participation in the Program until such time as shares
of Common Stock are distributed in accordance with Article 3.

5.8      STATEMENT OF ACCOUNT.

         After the end of each calendar quarter, each Participant in the Program
during the immediately preceding calendar quarter shall receive a statement of
his or her Stock Account under the Program as of the end of such preceding
calendar quarter. Such statement shall be in a form and contain such information
as is deemed appropriate by the Committee.

5.9      ENTIRE AGREEMENT.

         Each Participant shall agree to be bound by the terms of the Program as
set forth herein. This document contains the entire agreement of the Participant
and the Company with respect to the subject matter hereof. No modification or
claim of waiver of any of the provisions hereof shall be valid unless in writing
signed by the party against whom such modification or waiver is sought to be
enforced.

AGREED:                            ACCEPTED:

PARTICIPANT                        ATMI, INC.

                                     By:
-----------------------------          ------------------------------------
Date:                                Its:
                                       ------------------------------------
                                     Date:
                                       ------------------------------------

Attachment:  Beneficiary Designation

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