FIRST AMENDMENT TO LEASE AGREEMENT

         THIS AMENDMENT  (the "First  Amendment") is made effective the 31st day
of March, 2003 (the "Effective Date") by and between HSO Corporate Drive Limited
Partnership (herein referred to as "Lessor") and Enerteck Chemical Corp. (herein
referred to as "Lessee") on the following terms and conditions;

                                   WITNESSETH:

         WHEREAS,  Lessor,  as Lessor  therein,  and  Lessee as Lessee  therein,
entered into that  certain  Lease  Agreement  (the  "Lease") and all  subsequent
amendment  containing  approximately  557  square  feet of NRA in Suite 293 (the
"Leased  Premises") in that certain office building known as The Atrium Building
(the "Building") located at 10701 Corporate Dr., Stafford, Texas 77477; and

         WHEREAS,  Lessor and Lessee desire to amend,  modify and supplement the
Lease to relocate  Tenant and expand into the  Premises  known as suites 150 and
152 located on the First (1st) floor of the  building  consisting  of a total of
approximately  2,692 square feet (the  "Premises"),  which will be designated as
Suite 150.  Lessee is  presently  in Premises  known as Suite 293 and desires to
vacate the Premises for  approximately  557 square feet of net rentable area, as
stated in the  original  Lease  dated the 1st day of  February,  2001,  and will
relocate  and take  possession  of Suite 150 on the 1st day of  April,  2003 and
ending March 31, 2006;

         NOW, THEREFORE,  for and in consideration of the sum of TEN DOLLARS and
NO/100 ($10.00) and other valuable consideration respectively paid by each party
to the other the receipt and sufficiency of which is hereby acknowledged, Lessor
and Lessee do hereby supplement and amend the Lease as follows:

1.       All  of  the  recital   clauses   hereinabove   set  forth  are  hereby
         incorporated  by reference  as though set forth  verbatim and at length
         herein.

2.       Section 2. TERM shall be amended as follows:

         Subject to and upon the conditions as set forth herein,  or any addenda
         or exhibits  hereto this First Amendment to Lease Agreement shall amend
         the term to continue in force for Thirty Six (36) months, commencing on
         the 1st day of April and ending on the 31st day of March, 2006.

3.       Section 3. BASE RENTAL: Of the Lease Agreement, is hereby revised:

                  BASE RENT SCHEDULE:

         Rentable Square Footage (RSF): 2,682 SF - Commencement Date:
         March 31, 2003

<TABLE>
<CAPTION>
                                              ANNUAL BASE      MONTHLY BASE          ANNUAL BASE RENTAL
MONTHS                 TIME  PERIOD           RENTAL RATE      RENTAL AMOUNT               AMOUNT
------                 ------------           -----------      -------------               ------
<S>                  <C>                        <C>             <C>                     <C>
Twelve (12) Mos.     4/1/03- 3/31/04            $ 16.50         $ 3,687.75              $  44,253.00
Twelve (12) Mos.     4/1/04- 3/31/05            $ 17.00         $ 3,799.50              $  45,594.00
Twelve (12) Mos.     4/1/05- 3/31/06            $ 17.50         $ 3,911.25              $  46,935.00
         Total of Base Rental Payments Under Lease Agreement                            $ 136,782.00
----------------------------------------------------------------------------------------------------
</TABLE>

4.       EFFECT:  This First  Amendment  shall be binding on the parties hereto,
         their heirs, successors, guarantors, administrators and assigns.

                                     Page 1                Lessor Initials _____
                                                           Lessee Initials _____

<PAGE>

5.       EXHIBIT  "C"-TENANT  IMPROVEMENT  ALLOWANCE:  Landlord shall tender and
         Tenant shall accept  possession of the Premises in an "AS-IS  CONDITION
         without  any  warranty  expressed,  implied,  or  statutory  (including
         implied warranties of habitability, suitability, condition, and fitness
         for a particular purpose) Landlord to provide a Five Dollar ($5.00) per
         net rentable square foot Tenant  Improvement  Allowance.  All cost over
         and above the ($5.00) Tenant Improvement  Allowance will be at the sole
         cost to tenant.  Tenant and architects plans and  specifications are as
         follows:

         SCOPE OF WORK:

         1) Install new walls as shown on plans and specifications.
         2) Paint all existing and tape, float and paint new walls with Building
         Standard paint.
         3) Add and relocate doors per plans and specifications.
         4) Install  new glued down  Building  Standard  Carpet  throughout  the
         Premises.
         5) Install Glass Block half wall in reception area.
         6) Install Double Wooden Doors with glass inserts.
         7) Electrical-regular duplex outlets will be furnished in new walls.

6.       CONFIDENTIALITY:   Tenant   agrees   to  hold  this   First   Amendment
         confidential  and not to reveal the terms and  conditions of this First
         Amendment to any other party  without the prior  written  permission of
         Landlord.

7.       Lessor  represents  and warrants to Lessor that Lessor is in compliance
         with all its  duties  and  obligations  under  the Lease as of the date
         hereof.

8.       This  Amendment  shall be binding  upon and inure to the benefit of the
         parties hereto and their respective successors and assigns,  accept and
         amended  hereby,  the  "Lease"  will remain in full force and effect in
         accordance  with its original  terms with the  exception of the changes
         noted in this First Amendment to Lease.

         EXCEPT,  as expressly  hereby amended,  the terms and conditions of the
Lease are ratified and Affirmed in all respects.

         IN WITNESS THEREOF,  the undersigned has caused this First Amendment to
Lease to be duly executed effective on this 31st day of March, 2003.

         LESSOR:                                     LESSEE:
         HSO CORPORATE DRIVE LIMITED PARTNERSHIP     ENERTECK CHEMICAL CORP.

         BY ITS SOLE GENERAL PARTNER, HSO OFFICE HOLDINGS,

         LLC

         By: s/s                               By:s/s
            -----------------------------         ------------------------------

         Name: Patrick J. O'Connell            Name: Dwaine Reese
               --------------------------            ---------------------------

         Title: Manager                        Title: Chairman & COO
                -------------------------             --------------------------


                                     Page 2                Lessor Initials _____
                                                           Lessee Initials _____

<PAGE>


                                   EXHIBIT "B

                             FLOOR PLAN OF PREMISES
                                SUITE 150-2,682SF

                             ENERTECK CHEMICAL CORP.


                                     Page 3                Lessor Initials _____
                                                           Lessee Initials _____