Document:

<PAGE>   1

                                                                   EXHIBIT 10.43

                                AMENDMENT NO. 10
                                     TO THE
                            GENUINE PARTNERSHIP PLAN

         This Amendment to the Genuine Partnership Plan is adopted by Genuine
Parts Company (the "Company"), effective as of the dates set forth herein.

                                   WITNESSETH:

         WHEREAS, the Company maintains the Genuine Partnership Plan (the
"Plan"), as amended and restated effective January 1, 1994, and such Plan is
currently in effect;

         WHEREAS, the Company desires to amend Schedules B and C of the Plan;
and

         WHEREAS, pursuant to Section 11.01 of the Plan, the Company has
reserved the right to amend the Plan through action of the Committee for the
Plan;

         NOW, THEREFORE, BE IT RESOLVED that the Plan is hereby amended as
follows:

                                       1.

         Schedule B shall be deleted in its entirety and a new Schedule B shall
be added, effective November 30, 1999, to read as follows:

                                   "SCHEDULE B

                 Credit for Service with Predecessor Employers

I.       General Rule - No Past Service. Unless otherwise identified in Part II
below, an Employee will not receive Credited Service or Years of Eligibility
Service under this Plan for any purpose. Instead (unless otherwise required by
law) Hours of Service worked for a predecessor employer prior to the Designation
Date shall be ignored.

II.      Definition of Past Service Credit. If Employees who were previously
employed by a predecessor employer are granted past service credit (as noted
below), such Employees who are employed by an Employer on the Designation Date
shall receive Credited Service and Years of Eligibility Service under this Plan
beginning with the employment commencement date with the predecessor employer,
but subject to all of the rules concerning crediting of service and Breaks in
Service set forth in this Plan.

<PAGE>   2

<TABLE>
<CAPTION>

                                                                      Extent of Credit for Service
        Name                                  Designation Date        with Predecessor Company
        ----                                  ----------------        ----------------------------
<S>     <C>                                   <C>                     <C>
1.      Odell Hardware Company                     7/1/88              Past Service Credit Granted
        ("Odell")

2.      Clark Siviter                              7/1/88              Past Service Credit Granted

3.      Brooks-Noble Parts                         7/1/88              Past Service Credit Granted
        & Machine Co., Inc.

4.      General Automotive Parts                   7/1/88              Past Service Credit Granted
        Company and its subsidiaries
        ("General Automotive")

5.      Standard Units Parts                       7/1/88              Past Service Credit Granted
        Corporation including
        its subsidiary Manco,
        Inc. ("Standard Units
        Parts")

6.      NAPA Des Moines                            7/1/88              Past Service Credit Granted
        Warehouse ("Des Moines")
</TABLE>

III.     (a)      Acquisitions Prior to January 1, 1994.

         Participants employed by the following predecessor employers that were
acquired prior to January 1, 1994, shall not receive Past Service Credit as of
the date the predecessor employer was acquired by or merged into Genuine Parts
Company. However, after an employee of such predecessor employer becomes a
Participant in the Plan by satisfying the requirements of Section 3.01, such
Participant shall receive Credited Service for all employment with such
predecessor employer effective as of the Employment Date indicated below
provided such individuals were employed by an Employer (as determined by the
Committee) on the Employment Date.

         (b)      Acquisitions On or After January 1, 1994.

         Participants employed by the following predecessor employers that were
acquired on or after January 1, 1994 shall receive Credited Service and credit
for participation purposes under Article III for all employment with such
predecessor employer effective as of the Employment Date indicated below
provided such individuals were employed by an Employer (as determined by the
Committee) on the Employment Date.

                                      -2-
<PAGE>   3

         (c)      Important Restrictions.

         Credited Service granted under (a) or (b) above may be forfeited or
disregarded in accordance with the definition of Credited Service set forth in
Article II. Furthermore, no Credited Service shall be granted for employment
with a predecessor employer if the granting of such Credited Service will
adversely impact the tax qualified status of the Plan.

         Davis & Wilmar, Inc.                               May 1, 1993
         Pittsburg, PA                                      (Acquired 7/1/92)

         M&B, Inc. (Lesker Office Supplies, Inc.)           November 1, 1993
         Charlotte, NC

         The Parts, Inc.                                    January 1, 1995
         Anchorage, AK                                      (Acquired 1/1/94)

         Dade City Jobbing Group                            January 1, 1994
         Dade City, FL                                      (Acquired 1/2/92)

         Atlantic Tracy Inc.                                November 1, 1995
         Summerville, MA

         Midcap Bearing Corporation                         June 1, 1995
         San Antonio, TX

         Motion Equipment, Inc.                             June 1, 1995
         Houston, TX

         Power Drives & Bearings, Inc.                      October 1,1995
         Omaha, NE

         Friend's Motor Supply, Inc.                        June 30, 1997
         Hastings, NE

         Utah Bearing and Fabrication, Inc.                 October 3,1997
         Salt Lake City, UT

         Colorado Bearing and Supply, Inc.                  October 3, 1997
         Denver, CO

         Quality Auto Supply of Alaska, Inc.                April 1, 1998
         Palmer, AK

         Berry Bearing Company /Tom Steel Div.              January 1, 1998
         Lyons, IL                                          (Acquired 2/93)

         Cascade Bearings                                   April 1, 1998

                                      -3-
<PAGE>   4

         Yakima, WA

         Horizon U.S.A. Data Supplies, Inc.                 August 1, 1998
         Reno, NV                                           (Acquired on 4/1/95)

         Berry Bearing Company (all divisions               October 1, 1998
         other than Tom Steel Division)                     (Acquired 2/93)
         Lyons, IL

         Hub Tool & Supply, Inc.                            January 1, 1999
         Wichita, KS

         Bush-Miller, Inc.                                  April 1, 1999
         York, PA

         EIS, Inc.                                          December 1, 1999
         (including the following current and former
         subsidiaries of EIS, Inc.: Com-Kyl, Inc.;
         Scottsdale Tool & Supply, Inc.; Electronic Tool
         Co., Inc.; Summit Insulation Supply Company, Inc.;
         and H.A. Holden, Inc.)
         Atlanta, GA                                        (Acquired 5/98)"

                                       2.

         A new Section VII shall be added to the end of Schedule C to read as
follows:

          "VII.   Additional Forms of Benefits for Former Participants in the
                  Hub Tool & Supply, Inc. 401(k) Plan

                  A. Background. As of December 31, 1998, the Hub Tool & Supply,
                  Inc. 401(k) Plan (the "Hub Plan") was frozen. The Hub Plan was
                  subsequently merged into the Plan. Accounts established under
                  the Hub Plan shall constitute Prior Employer Accounts.

                  B. Eligibility of Former Participants in the Hub Plan to
                  Receive Additional Forms of Benefits. Effective as of the
                  merger of the Hub Plan into this Plan, former participants in
                  the Hub Plan who became Participants in this Plan ("Hub
                  Participants") may elect to receive, in addition to the
                  benefits offered under this Plan, a distribution from their
                  Prior Employer Accounts as follows:

                  (i)      in a life annuity with monthly income payable for the
                           life of the Participant;

                                      -4-
<PAGE>   5

                  (ii)     in a life annuity with monthly income payable for the
                           life of the Participant and, if the Participant dies
                           before the end of a period of five, ten, or fifteen
                           years as selected by the Participant, with monthly
                           income payable to the Participant's beneficiary until
                           the end of such period;

                  (iii)    in a life annuity with monthly income payable for the
                           life of the Participant and, if the Participant dies
                           before the total amount paid equals the Participant's
                           Prior Employer Account, with monthly income payable
                           to the Participant's beneficiary until the total
                           amount paid equals the Participant's Prior Employer
                           Account;

                  (iv)     in a joint and survivor life annuity with monthly
                           income payable for the life of the Participant; with
                           50%, 66 2/3%, or 100% (as elected by the Participant)
                           of the Participant's monthly income payable for the
                           life of the Participant's survivor; and, if both the
                           Participant and the Participant's survivor die before
                           the total amount paid equals the Participant's Prior
                           Employer Account, payments continue to the
                           Participant's beneficiary until the total amount paid
                           equals the Participant's Prior Employer Account;

                  (v)      in installment payments made monthly for a fixed
                           period of time equal to or greater than 60 months; or

                  (vi)     in a series of flexible income payments for an amount
                           each year equal to that elected by the Participant
                           which, in the year the Participant attains age 70
                           1/2, must be equal to or greater than a minimum
                           amount."

                                       3.

         Except as amended herein, the Plan shall remain in full force and
effect.

         IN WITNESS WHEREOF, Genuine Parts Company, acting through the Committee
has caused this Amendment to the Plan to be executed on the date shown below but
effective as of the date indicated above.

                                      -5-
<PAGE>   6

                                        COMMITTEE TO THE
                                        GENUINE PARTNERSHIP PLAN

                                        By:   /s/ Frank M. Howard
                                           -------------------------------------
                                           Frank Howard, acting on behalf of the
                                           Committee

                                        Date:  December 30, 1999
                                             -----------------------------------

                                      -6-<PAGE>   1
                                                                   EXHIBIT 4.1

This Security Has Not Been Registered Under The Securities Act Of 1933, As
Amended, or any State Securities Laws. It May Not Be Sold or Offered for Sale
Except Pursuant To An Effective Registration Statement Under Said Act and any
Applicable State Securities Law Or An Applicable Exemption From Such
Registration Requirements.

NO. 1                                                                $7,500,000

DATED:  FEBRUARY 2, 2000

                         U.S. PLASTIC LUMBER CORPORATION

                  5% CONVERTIBLE DEBENTURE DUE FEBRUARY 2, 2005

         THIS DEBENTURE ("Debenture") is one of a duly authorized issue of
Debentures of U.S. PLASTIC LUMBER CORPORATION, a corporation duly organized and
existing under the laws of the State of Nevada (the "Company"), designated as
the Company's 5% Convertible Debentures Due February 2, 2005, in an aggregate
principal amount of Seven Million Five Hundred Thousand U.S. Dollars
(U.S.$7,500,000) (the "Debenture").

         FOR VALUE RECEIVED, the Company promises to pay to HALIFAX FUND, L.P.,
the initial holder hereof, or its order (including successors-in-interest, the
"Holder"), the principal sum of SEVEN MILLION FIVE HUNDRED THOUSAND U.S. DOLLARS
(U.S.$7,500,000) on February 2, 2005 (the "Maturity Date") and to pay interest
on the principal sum outstanding under this Debenture ("Outstanding Principal
Amount"), at the rate of 5% per annum payable quarterly in arrears on the first
day of January, April, July and October of each year (each an "Interest Payment
Date"), with the first such payment due on April 1, 2000. Interest shall accrue
daily commencing on the date hereof and shall continue until payment in full of
all amounts due under this Debenture. The interest so payable will be paid to
the person in whose name this Debenture is registered on the records of the
Company regarding registration and transfers of the Debenture (the "Debenture
Register"). Capitalized terms used herein and not otherwise defined shall have
the meanings set forth in the Convertible Debenture Purchase Agreement dated as
of February 2, 2000 between the Company and the Holder (the "Purchase
Agreement") or the Registration Rights Agreement dated as of February 2, 2000
between the Company and the Holder (the "Registration Rights Agreement").

         The principal of, interest on, and default payments (referred to below)
in respect of this Debenture are payable in such coin or currency of the United
States as of the time of payment is legal tender for payment of public and
private debts, at the address last appearing on the Debenture Register of the
Company as designated in writing by the Holder hereof from time to time;
PROVIDED, HOWEVER, that, in lieu of paying such interest in coin or currency,
the Company may, at its option (provided it gives at least fifteen (15) business
days notice prior to an Interest Payment Date), pay interest on this Debenture
for any Interest Payment Date by adding the amount thereof to the Outstanding
Principal Amount due under this Debenture ("PIK Interest"), pursuant to an
irrevocable statement in the form of Exhibit 2 hereto ("PIK Statement")
delivered at least fifteen (15) business days prior to the Interest Payment Date
on which the Company plans to pay such PIK Interest and effective for such

<PAGE>   2

Interest Payment Date only. If neither the cash interest due hereunder is paid
when due, nor the PIK Statement delivered, to the Holder as provided above, the
Company shall no longer have the right to choose the PIK Interest option on that
Interest Payment Date or any future Interest Payment Dates and the Holder may
elect either cash interest or PIK Interest hereunder at its option. Any PIK
Interest when so added to the Outstanding Principal Amount due under this
Debenture shall, for all purposes of this Debenture, be deemed to have been part
of the principal indebtedness originally evidenced by this Debenture including,
without limitation, for purposes of determining interest payable hereunder after
the applicable Interest Payment Date for which such PIK Statement is delivered
by the Company and amounts convertible into Common Shares hereunder after the
applicable Interest Payment Date for which such PIK Statement is delivered by
the Company.

         The Company will pay any principal due and all accrued and unpaid
interest due upon this Debenture to the person that is the Holder of this
Debenture on the records of the Company as of the applicable Interest Payment
Date and addressed to such Holder at the last address appearing on the Debenture
Register.

         The Outstanding Principal Amount and interest due hereunder shall bear
interest, from and after the 31st day following the occurrence and during the
continuance of an Event of Default hereunder, at the rate equal to the lower of
the Citibank Prime Rate per annum plus six (6%) percent or the highest rate
permitted by law; PROVIDED that the interest rate of this Debenture shall not be
reduced below 5% as a result of this provision.

         Additional cash payments (referred to as "default payments") may be
required pursuant to the Registration Rights Agreement if there occurs an
"Interfering Event" (as defined therein). Such default payments, if not paid in
cash when due, may be treated by the Holder in its sole discretion as being
added to the Outstanding Principal Amount due under this Debenture.

         Subject to applicable law, any interest otherwise payable that is not
paid for any applicable period because it would exceed the highest rate
permitted by law shall become payable whenever the payment thereof, together
with other interest due for any such subsequent period, would not exceed such
highest legal rate.

         The Holder of this Debenture is entitled to certain rights and remedies
pursuant to the Purchase Agreement and Registration Rights Agreement, including
without limitation provisions requiring mandatory redemption of the Debenture.
This Debenture does not provide voting rights to the Holder.

         This Debenture is subject to the following additional provisions:

         1.       DENOMINATION. The Debentures are exchangeable for an equal
aggregate principal amount of Debentures of different denominations, as
requested by the Holder surrendering the same. No service charge will be made
for such registration or transfer or exchange.

                                       2
<PAGE>   3

         2.       TRANSFERS. This Debenture may be transferred or exchanged in
the United States only in compliance with the Securities Act of 1933, as amended
(the "Act") and applicable state securities laws, or applicable exemptions
therefrom. Prior to due presentment for transfer of this Debenture, the Company
may treat the person in whose name this Debenture is duly registered on the
Company's Debenture Register as the owner hereof for the purpose of receiving
payment as herein provided, whether or not this Debenture is overdue.

         3.       DEFINITIONS. For purposes hereof the following definitions
shall apply:

                  "ADJUSTABLE PRICES" shall have the meaning set forth in
Section 9(a).

                  "ADJUSTMENT EVENT" shall have the meaning set forth in Section
5(d).

                  "CHANGE IN CONTROL TRANSACTION" shall mean the occurrence of
(x) any consolidation or merger of the Company with or into any other
corporation or other entity or person (whether or not the Company is the
surviving corporation), or any other corporate reorganization or transaction or
series of related transactions in which in excess of 50% of the Company's voting
power is transferred through a merger, consolidation, tender offer or similar
transaction, or (y) any person (as defined in Section 13(d) of the Securities
Exchange Act of 1934, as amended (the "Exchange Act")), together with its
affiliates and associates (as such terms are defined in Rule 405 under the Act),
beneficially owns or is deemed to beneficially own (as described in Rule 13d-3
under the Exchange Act without regard to the 60-day exercise period) in excess
of 50% of the Company's voting power.

                  "CLOSING DATE" shall mean the date of original issuance of
this Debenture.

                  "COMMON STOCK" shall mean the common stock, par value $0.0001,
of the Company.

                  "CONVERSION NOTICE" shall have the meaning set forth in
Section 5(e).

                  "CONVERSION PRICE" shall have the meaning set forth in Section
5(c).

                  "CONVERSION RATE" shall have the meaning set forth in Section
5(b).

                  "FIXED PRICE" shall have the meaning set forth in Section
5(c)(i).

                  "FLOATING PRICE" refers to the lowest trading price utilized
in the calculation of the Conversion Price under Section 5(c)(ii).

                  "FLOATING REFERENCE PERIOD" refers to the four (4) Trading Day
period referred to in Section 5(c)(ii).

                  "FLOATING REFERENCE PRICE" refers to any of the trading prices
calculated in the computation of the Floating Price set forth in Section
5(c)(ii).

                                       3
<PAGE>   4

                  "FORCED CONVERSION DATE" shall mean the Maturity Date, without
taking into consideration any acceleration thereof by reason of default,
required redemption, or otherwise. The Forced Conversion Date shall be subject
to deferral as provided for herein and in the Registration Rights Agreement.

                  "HOLDER CONVERSION DATE" shall have the meaning set forth in
Section 5(e).

                  "INITIAL PRICE" shall mean, with respect to the Common Stock,
$8.775.

                  "MARKET PRICE FOR SHARES OF COMMON STOCK" shall mean the price
of one share of Common Stock determined as follows:

                  (i)   If the Common Stock is listed on NASDAQ, the closing bid
price on the date of valuation;

                  (ii)  If the Common Stock is listed on the New York Stock
Exchange or the American Stock Exchange, the closing bid price on such exchange
on the date of valuation;

                  (iii) If neither (i) nor (ii) apply but the Common Stock is
quoted in the over-the-counter market, another recognized exchange, on the pink
sheets or bulletin board, the lesser of (A) the lowest sales price or (B) the
mean between the last reported "bid" and "asked" prices thereof on the date of
valuation; and

                  (iv)  If neither clause (i), (ii) or (iii) above applies, the
market value as determined by a nationally recognized investment banking firm or
other nationally recognized financial advisor retained by the Company for such
purpose, taking into consideration, among other factors, the earnings history,
book value and prospects for the Company, and the prices at which shares of
Common Stock recently have been traded. Such determination shall be conclusive
and binding on all persons.

                  "MINIMUM FLOATING CONVERSION PRICE" shall have the meaning set
forth in Section 5(c).

                  "RESTRICTED OWNERSHIP PERCENTAGE" shall have the meaning set
forth in Section 12.

                  "TRADING DAY" shall mean a day on which the Common Stock is
traded on the NASDAQ or principal exchange on which the Common Stock has been
listed (or any similar organization or agency succeeding such market or
exchange's functions of reporting prices).

         4.       CHANGE IN CONTROL, ETC. If at any time there occurs any Change
in Control Transaction, Holder shall be entitled, at its sole option, to have
the Company redeem this Debenture in whole or in part at a redemption price
equal to 130% of the Outstanding Principal Amount of this Debenture plus all
accrued but unpaid interest and penalties on this Debenture. Such Holder shall
be entitled to make such election at any time after commencement and up to 10
days after the effective date of the Change in Control Transaction. For purposes

                                       4
<PAGE>   5

of this Section 4, the commencement date shall be the day upon which the Change
in Control Transaction was publicly announced.

         5.       CONVERSION AT THE OPTION OF THE HOLDER. The Holder of this
Debenture shall have the following conversion rights.

                        (a)   HOLDER'S RIGHT TO CONVERT. This Debenture shall be
convertible at any time, in whole or in part, at the option of the Holder
hereof, into fully paid, validly issued and nonassessable shares of Common
Stock. If this Debenture is converted in part, the remaining portion of this
Debenture not so converted shall remain entitled to the conversion rights
provided herein.

                        (b)   CONVERSION PRICE FOR HOLDER CONVERTED SHARES. The
Outstanding Principal Amount of this Debenture that is converted into shares of
Common Stock at the option of the Holder shall be convertible into the number of
shares of Common Stock which results from application of the following formula:

                                    P + I + D
                         ------------------------------
                                Conversion Price

         P = Outstanding Principal Amount of this Debenture submitted for
             conversion
         I = accrued but unpaid interest (not previously added to principal)
             on P as of the Holder Conversion Date
         D = default payments (not previously added to principal) on P as of
             the Holder Conversion Date

                           The number of shares of Common Stock into which each
$1,000 principal amount of this Debenture hereto may be converted pursuant to
this paragraph hereof is hereafter referred to as the "Conversion Rate."

                        (c)   CONVERSION PRICE. Subject to adjustments pursuant
to Section 9, this Debenture will have a conversion price (the "Conversion
Price") equal to the lesser of (i) $9.6525 (such price, as adjusted in
accordance with Section 9 of this Debenture, Section 3.9 of the Purchase
Agreement and Section 2(b)(i) of the Registration Rights Agreement, shall be
referred to herein as the "Fixed Price") or (ii) the Floating Price, which shall
be equal to the lowest trading price of the Common Stock on the principal
trading market for such Common Stock (which is currently the Nasdaq National
Market) during the four (4) Trading Days prior to but not including the Holder
Conversion Date; PROVIDED that the Floating Price shall not be less than $8.25,
subject to adjustment pursuant to Section 9 of this Debenture, Section 3.9 of
the Purchase Agreement and Section 2(b)(i) of the Registration Rights Agreement
(hereinafter, the "Minimum Floating Conversion Price").

                                       5
<PAGE>   6

                        (d)   ADJUSTMENTS TO FLOATING REFERENCE PRICES. In the
event that during the Floating Reference Period provided for above, the Company
shall pay any dividend on the Common Stock payable in Common Stock or in rights
to acquire Common Stock, or shall effect a stock split or reverse stock split
(each such Company action shall be referred to herein as an "Adjustment Event"),
then each Floating Reference Price prior to the date of such Adjustment Event
shall be proportionately decreased or increased, as appropriate, to give effect
to such event.

                        (e)   MECHANICS OF CONVERSION. In order to convert this
Debenture (in whole or in part) into full shares of Common Stock, the Holder (i)
shall give written notice in the form of EXHIBIT 1 hereto (the "Conversion
Notice") by facsimile to the Company at such office that the Holder elects to
convert the principal amount (plus accrued but unpaid interest and default
payments) specified therein, which such notice and election shall be revocable
by the Holder at any time prior to its receipt of the Common Stock upon
conversion, and (ii) as soon as practicable after such notice, shall surrender
this Debenture, duly endorsed, by either overnight courier or 2-day courier, to
the principal office of the Company; PROVIDED, HOWEVER, that the Company shall
not be obligated to issue certificates evidencing the shares of the Common Stock
issuable upon such conversion unless either the Debenture evidencing the
principal amount is delivered to the Company as provided above, or the Holder
notifies the Company that such Debenture(s) have been lost, stolen or destroyed
and promptly executes an agreement reasonably satisfactory to the Company to
indemnify the Company from any loss incurred by it in connection with such lost,
stolen or destroyed Debentures. If a Holder is converting less than the maximum
number of shares it may convert under its Debenture, the Company shall reissue
the Debenture with the appropriate remaining principal amount as soon as
practicable after the Company shall have received the Holder's surrendered
Debenture.

                              The Company shall issue and deliver within one
business day of the delivery to the Company of such Conversion Notice, to such
Holder of Debenture(s) at the address of the Holder, or to its designee, a
certificate or certificates for the number of shares of Common Stock to which
the Holder shall be entitled as aforesaid, together with a calculation of the
Conversion Rate and a Debenture or Debentures for the principal amount of
Debentures not submitted for conversion. The date on which the Conversion Notice
is given (the "Holder Conversion Date") shall be deemed to be the date the
Company received by facsimile the Conversion Notice, and the person or persons
entitled to receive the shares of Common Stock issuable upon such conversion
shall be treated for all purposes as the record holder or holders of such shares
of Common Stock on such date.

                              In lieu of delivering physical certificates
representing the Common Shares issuable upon conversion of Debentures or the
Warrant Shares (as defined in the Purchase Agreement) deliverable upon exercise
of Warrants (as defined in the Purchase Agreement), provided the Company's
transfer agent is participating in the Depository Trust Company ("DTC") Fast
Automated Securities Transfer ("FAST") program, upon request of the holder, the
Company shall use its best efforts to cause its transfer agent to electronically
transmit the Common Shares and Warrant Shares issuable upon conversion or
exercise to the Holder, by crediting the account of Holder's prime broker with

                                       6
<PAGE>   7

DTC through its Deposit Withdrawal Agent Commission ("DWAC") system. The time
periods for delivery described above shall apply to the electronic transmittals
through the DWAC system. The parties agree to coordinate with DTC to accomplish
this objective. The conversions pursuant to Sections 5 and 6 shall be deemed to
have been made immediately prior to the close of business on the Holder
Conversion Date. The person or persons entitled to receive the Common Shares
issuable upon such conversion shall be treated for all purposes as the record
holder or holders of such Common Shares at the close of business on the Holder
Conversion Date.

         6.       CONVERSION UPON MATURITY.

                  (a)   At the Forced Conversion Date, the Outstanding Principal
Amount of, and all accrued and unpaid interest on, and default payments and all
other amounts owing under, all Debentures outstanding at such time shall be
automatically converted into Common Stock of the Company in accordance with the
terms of the Debentures, the Purchase Agreement and the Registration Rights
Agreement, without notice; PROVIDED, however, that such conversion will be
subject to the limitations on a Holder's right to convert as set forth in
Section 12 below; and, PROVIDED FURTHER that the Forced Conversion Date shall be
deferred for such number of days as is equal to 1.5 times the number of days (A)
there is not Effective Registration (as defined in the Purchase Agreement), but
not including the first 90 days after the Prior Closing Date (as defined in the
Registration Rights Agreement); (B) there is not a sufficient amount of shares
of Common Stock available for conversion of all outstanding Debentures; (C) for
any other reason there is a default in the obligations of the Company under this
Debenture, the Purchase Agreement or the Registration Rights Agreement; or (D)
there is a suspension, restriction or limitation in the ability of holders of
Debentures to sell shares of Common Stock received upon conversion of Debentures
under the Registration Statement and prospectus for any reason. The portion of
the Outstanding Principal Amount of the Debenture that may not be converted by
reason of such Section 12 limitation shall be paid to the Holder by the Company
in cash in an amount equal to 110% of the sum of (i) the Outstanding Principal
Amount and (ii) accrued but unpaid interest and default payments ("Cash
Payment").

                  The Company shall issue and deliver within T+3 after delivery
to the Company of this Debenture, or after receipt of the agreement and
indemnification described in Section 5(e) above, to the Holder of the Debenture
at the address of the Holder, or to its designee, a certificate or certificates
for the number of shares of Common Stock to which the Holder shall be entitled
hereunder, together with any Cash Payment and a calculation of the Conversion
Rate. The person or persons entitled to receive the shares of Common Stock
issuable upon such conversion shall be treated for all purposes as the record
holder or holders of such shares of Common Stock on the Forced Conversion Date.
The Forced Conversion Date shall be a "Holder Conversion Date" for purposes of
this Debenture.

                  (b)   Notwithstanding the preceding subparagraph (6)(a), no
holder of Debentures shall be obligated to convert any Debentures held by such
Holder on the Forced Conversion Date unless and until each of the following
conditions has been satisfied or exists, each of which shall be a condition
precedent to any such automatic conversion:

                                       7
<PAGE>   8

                        (i)   no material default or breach exists, and no event
                  shall have occurred which constitutes (or would constitute
                  with notice or the passage of time or both) a material default
                  or breach of the Purchase Agreement, the Registration Rights
                  Agreement, any Warrant or this Debenture;

                        (ii)  none of the events described in clauses (i)
                  through (iv) of Section 2(b) of the Registration Rights
                  Agreement shall have occurred and be continuing;

                        (iii) Effective Registration (as defined in the Purchase
                  Agreement) has occurred and is continuing and has continuously
                  existed for the prior 60 consecutive trading days;

                        (iv)  the Company (and its direct and indirect
                  subsidiaries on a consolidated basis) has assets with a net
                  realizable fair market value exceeding its liabilities and is
                  able to pay all its debts as they become due in the ordinary
                  course of business, and the Company is not and has not been
                  subject to any liquidation, dissolution or winding up of its
                  affairs; and

                        (v)   each Holder of Debentures shall have received a
                  certificate from an appropriate executive officer of the
                  Company certifying that each of the foregoing conditions
                  precedent exist or have been satisfied.

Such automatic conversion shall be subject to and governed by all the provisions
relating to voluntary conversion of the Debentures contained herein.

         7.       FORCED CONVERSION.

                  (a)   At any time commencing three (3) months after Effective
Registration first exists, if the closing bid price of the Common Stock on its
principal market (assuming such market is an Approved Market as defined in the
Purchase Agreement) is at least 175% of the Fixed Price for twenty (20)
consecutive Trading Days ("Pre-Notice Period"), the Company may require the
Holder to deliver a Conversion Notice for this Debenture. To exercise such
right, the Company must deliver a notice to that effect ("Notice of Forced
Conversion") at least twenty (20) Trading Days prior to the date fixed for
conversion (the "Post-Notice Period").

                  (b)   A Notice of Forced Conversion shall only be effective
if:

                        (i)   Effective Registration existed during the entire
Pre-Notice Period and Post-Notice Period;

                        (ii)  the provisions of Clauses (i) and (v) of Section
6(b) above have been satisfied; and

                        (iii) conversion by the Holder will not exceed the
limits on a Holder's right to convert under Section 14 below. The portion of the
Outstanding Principal Amount that may not be converted by reason of such Section
14 shall be paid to the Holder in cash as provided in Section 6(a) for the Cash
Payment.

                                       8
<PAGE>   9

         8.       HOLDER PUT OPTION.

                  (a)   In the event that the closing bid price of the Common
Stock on its principal market is less than the Minimum Floating Conversion Price
for ten (10) consecutive Trading Days after the first anniversary of the
Closing, the Holder may put to the Company an option (the "Company Option"),
which shall be in writing (the "Put Notice"), to elect to (i) repurchase this
Debenture (or any portion thereof as selected by Holder) for a cash price equal
to 110% of the Outstanding Principal Amount to be repurchased plus all accrued
but unpaid interest or (ii) have the Minimum Floating Conversion Price
permanently re-set to zero. The Put Notice shall indicate whether the Holder
seeks to have all or a portion of the Debenture repurchased and shall set the
date for the Company's repurchase of this Debenture (or such portion thereof),
which shall be at least 20 Trading Days after the date of the Put Notice (the
"Repurchase Date").

                  (b)   Within three (3) Trading Days of its receipt of the Put
Notice, the Company must respond to the Put Notice by providing written notice
("Company Notice") to the Holder of its election. If the Company opts to
repurchase this Debenture (or such portion thereof as indicated in the Put
Notice), the repurchase shall occur on the Repurchase Date at the offices of
Holder's counsel. The Holder may continue to exercise its conversion rights
under the Debenture until the Repurchase Date, and thereafter, until the Company
pays for the Debenture as set forth below. If the Company opts to have the
Minimum Floating Conversion Price permanently re-set to zero, same shall be
deemed to have occurred as of the date of the Put Notice, and for the four (4)
Trading Days immediately following the receipt of the Company Notice (or the
expiration of the three (3) Trading Day period for delivery of such Company
Notice), the Conversion Price shall be computed as if the Floating Price was the
lowest trading price of the Common Stock during the Trading Days commencing with
the date of the Put Notice and expiring on the date of the Conversion Notice. If
the Company does not respond to the Put Notice within three (3) Trading Days of
its receipt thereof, then the Company shall be deemed to have opted to have the
Minimum Floating Conversion Price permanently re-set to zero.

                  (c)   If the Company opts to repurchase the Debenture (or such
portion thereof as indicated in the Put Notice), but fails to pay for same in
full on the Repurchase Date in immediately available funds, then (i) the Minimum
Floating Conversion Price shall be permanently re-set to zero as of the date of
the Put Notice; and (ii) the Company shall be obligated to repurchase this
Debenture (or such portion thereof) in accordance with the Put Notice and (iii)
the Holder may, but shall not be obligated to, rescind, in whole or in part, its
put to the Company of the Company Option, at any time and from time to time,
prior to the repurchase by the Company, if any, of the Debenture (or such
portion thereof) pursuant to this Section 8.

                  (d)   If the Company opts to repurchase the Debenture (or such
portion thereof as indicated in the Put Notice), but fails to pay for same in
full on the Repurchase Date in immediately available funds, then, for the four
(4) Trading Days following the Repurchase Date, the Holder shall have, in
addition to the conversion rights otherwise set forth in this Debenture, the
special option to convert (the "Special Conversion Option") the Debenture (or
any portion thereof as selected by Holder) at the "Special Conversion Price" (as
defined below). At the Holder's option, the Holder shall exercise its Special
Conversion Option by providing the Company with a Conversion Notice in
accordance with Section 5 hereof and indicating on such Conversion Notice that
the Holder is exercising its Special Conversion Option hereunder. The "Special

                                       9
<PAGE>   10

Conversion Price" shall be equal to the Conversion Price except that, for the
purpose of determining the Special Conversion Price, the Floating Price shall be
equal to the lowest trading price of the Common Stock on the principal trading
market for such Common Stock from the date of the Put Notice through the date of
the relevant Conversion Notice. This Special Conversion Option shall be in
addition to, and not in lieu of, any other rights or remedies available to the
Holder. If the Holder exercises its Special Conversion Option in accordance with
this Section 8(d), except as expressly provided herein to the contrary, the
conversion shall occur in accordance with the provisions of Section 5.

         9.       STOCK SPLITS; DIVIDENDS; ADJUSTMENTS; REORGANIZATIONS.

                  (a)   If the Company, at any time while the Debentures are
outstanding, (i) shall pay a stock dividend or otherwise make a distribution or
distributions on any equity securities (including investments or securities
convertible into or exchangeable for such equity securities) in shares of Common
Stock, (ii) issue any securities payable in shares of Common Stock, (iii)
subdivide the outstanding shares of Common Stock into a larger number of shares,
(iv) combine outstanding shares of Common Stock into a smaller number of shares,
the Fixed Price and Minimum Floating Conversion Price ("Adjustable Prices")
shall be multiplied by a fraction of which the numerator shall be the number of
shares of Common Stock outstanding before such event and of which the
denominator shall be the number of shares of Common Stock outstanding after such
event. Any adjustment made pursuant to this Section 9(a) shall become effective
immediately after the record date for the determination of shareholders entitled
to receive such dividend or distribution and shall become effective immediately
after the effective date in the case of an issuance, a subdivision or a
combination.

                  (b)   In the event that the Company issues or sells any Common
Stock or securities which are convertible into or exchangeable for its Common
Stock or any convertible or exchangeable securities, or any warrants or other
rights to subscribe for or to purchase or any options for the purchase of its
Common Stock or any such convertible or exchangeable securities (other than
shares or options issued (i) pursuant to the Company's employee or director
option plans or shares issued upon exercise of options, warrants or rights
outstanding on the date of the Purchase Agreement and listed in the Company's
most recent periodic report filed under the Exchange Act and (ii) as
compensation in connection with arrangements with consultants and promoters of
the Common Stock) at an effective purchase price per share which is less than
either or both of the Adjustable Prices then in effect, then the Adjustable
Price or Prices in effect immediately prior to such issue or sale shall be
reduced effective concurrently with such issue or sale to an amount determined
by multiplying such applicable Adjustable Price then in effect by a fraction,
(x) the numerator of which shall be the sum of (1) the number of shares of
Common Stock outstanding immediately prior to such issue or sale, plus (2) the
number of shares of Common Stock which the aggregate consideration received by
the Company for such additional shares would purchase at such Adjustable Price
then in effect; and (y) the denominator of which shall be the number of shares
of Common Stock of the Company outstanding immediately after such issue or sale.

                                       10
<PAGE>   11

                  For the purposes of the foregoing adjustment, in the case of
the issuance of any convertible or exchangeable securities, warrants, options or
other rights to subscribe for or to purchase or exchange for, shares of Common
Stock ("Exchangeable Securities"), the maximum number of shares of Common Stock
issuable upon exercise, conversion or exchange of such Exchangeable Securities
shall be deemed to be outstanding, provided that no further adjustment shall be
made upon the actual issuance of Common Stock upon exercise, exchange or
conversion of such Exchangeable Securities.

                  (c)   If the Company, at any time while the Debentures are
outstanding, shall distribute to all holders of Shares of Common Stock evidences
of its indebtedness or assets or rights or warrants to subscribe for or purchase
any security (excluding those referred to in Section 9(b) above) then in each
such case each of the Adjustable Prices thereafter shall be determined by
multiplying the applicable Adjustable Price in effect immediately prior to the
record date fixed for determination of shareholders entitled to receive such
distribution by a fraction of which the denominator shall be the Market Price
for Shares of Common Stock determined as of the record date mentioned above, and
of which the numerator shall be such Market Price for Shares of Common Stock on
such record date less the then fair market value at such record date of the
portion of such assets or evidence of indebtedness so distributed applicable to
one outstanding share of Common Stock as determined by the Board of Directors in
good faith; PROVIDED, however that in the event of a distribution exceeding 25%
of the net assets of the Company, such fair market value shall be determined by
a nationally recognized or major regional investment banking firm or firm of
independent chartered accountants of recognized standing (which may be the firm
that regularly examines the financial statements of the Company) (an
"Appraiser") selected in good faith by the Board of Directors and Holders of a
majority in interest of the Debentures. In either case the adjustments shall be
described in a statement provided to all holders of Debentures of the portion of
assets or evidences of indebtedness so distributed or such subscription rights
applicable to one outstanding share of Common Stock. Such adjustment shall be
made whenever any such distribution is made and shall become effective
immediately after the record date mentioned above.

                  (d)   (1) In the event that at any time or from time to time
after the Closing Date, the Common Stock issuable upon the conversion of the
Debentures is changed into the same or a different number of shares of any class
or classes of stock, whether by merger, consolidation, recapitalization,
reclassification or otherwise (other than a subdivision or combination of shares
or stock dividend or reorganization provided for elsewhere in this Section 9),
then and as a condition to each such event provision shall be made in a manner
reasonably acceptable to the Holders of Debentures so that each Holder of
Debentures shall have the right thereafter to convert such Debenture into the
kind of stock receivable upon such recapitalization, reclassification or other
change by holders of shares of Common Stock, all subject to further adjustment
as provided herein. In such event, the formulae set forth herein for conversion
and redemption shall be equitably adjusted to reflect such change in number of
shares or, if shares of a new class of stock are issued, to reflect the market
price of the class or classes of stock (applying the same factors used in
determining the Fixed Price) issued in connection with the above described
transaction.

                                       11
<PAGE>   12

                           (2) If at any time or from time to time after the
Closing Date there is a capital reorganization of the Common Stock, including by
way of a sale of all or substantially all of the assets of the Company (other
than a recapitalization, subdivision, combination, reclassification or exchange
of shares provided for elsewhere in this Section 9), then, as a part of and a
condition to such reorganization, provision shall be made in a manner reasonably
acceptable to the Holders of the Debentures so that the Holders of the
Debentures shall thereafter be entitled to receive upon conversion of the
Debentures the number of shares of stock or other securities or property to
which a holder of the number of shares of Common Stock deliverable upon
conversion would have been entitled on such capital reorganization. In any such
case, appropriate adjustment shall be made in the application of the provisions
of this Section 9 with respect to the rights of the Holders of the Debentures
after the reorganization to the end that the provisions of this Section 9 shall
be applicable after that event and be as nearly equivalent as may be
practicable, including, by way of illustration and not limitation, by equitably
adjusting the formulae set forth herein for conversion and redemption to reflect
the market price of the securities or property (applying the same factors used
in determining the Market Price for Shares of Common Stock) issued in connection
with the above described transaction.

                  (e)   If at any time during the period ending twelve (12)
months after the Closing Date, the Company sells or agrees to sell (including
pursuant to a letter of intent, term sheet, or similar means) shares of Common
Stock or securities or options convertible into, exercisable for, or
exchangeable for, shares of Common Stock (other than (i) a sale pursuant to a
bona fide registered public offering of shares of Common Stock by the Company
conducted on the basis of a firm commitment underwriting raising at least
$10,000,000 and (ii) shares or options issued (x) pursuant to the Company's
employee, director or consultant stock option plans and (y) as compensation in
connection with arrangements with consultants and promoters of the Common
Stock), then, if the effective or maximum sales price of the shares of Common
Stock with respect to such transaction (including the effective or maximum
conversion exercise or exchange price) ("Other Price") is less than the Fixed
Price of the Debentures at such time, the Company, at the option of a holder
exercised by written notice to the Company, shall adjust the Fixed Price
applicable to the Debentures of such holder not yet converted in form and
substance reasonably satisfactory to such holder of Debentures so that the
conversion price applicable to those Debentures shall, in no event, be greater,
after giving effect to all other adjustments contained therein, than the Other
Price.

                  (f)   Whenever any element of the Conversion Price is adjusted
pursuant to Section 9(a), (b), (c), (d) or (e), the Company shall promptly mail
to each Holder of the Debentures, a notice setting forth the Conversion Price
after such adjustment and setting forth a brief statement of the facts requiring
such adjustment.

                  (g)   In the event of any taking by the Company of a record
date of the holders of any class of securities for the purpose of determining
the holders thereof who are entitled to receive any dividend or other
distribution, any security or right convertible or exchangeable into or
entitling the holder thereof to receive additional shares of Common Stock, or
any right to subscribe for, purchase or otherwise acquire any shares of stock of
any class or any other securities or property, or to receive any other right,

                                       12
<PAGE>   13

the Company shall deliver to each Holder of Debentures at least 20 days prior to
the date specified therein, a notice specifying the date on which any such
record is to be taken for the purpose of such dividend, distribution, security
or right and the amount and character of such dividend, distribution, security
or right.

         10.      FRACTIONAL SHARES. No fractional shares of Common Stock or
scrip representing fractional shares of Common Stock shall be issuable
hereunder. The number of shares of Common Stock that are issuable upon any
conversion shall be rounded up to the nearest whole share.

         11.      RESERVATION OF STOCK ISSUABLE UPON CONVERSION.

                  (a)   RESERVATION REQUIREMENT. The Company covenants that it
will at all times reserve and keep available out of its authorized and unissued
Common Stock solely for the purpose of issuance upon conversion of the
Debentures as herein provided, free from preemptive rights or any other present
or contingent purchase rights of persons other than the Holders of the
Debentures, 200% of the maximum number of shares of Common Stock as shall be
issuable (taking into account the adjustments and restrictions of Sections 5 and
9 hereof) upon the conversion of all of the Debentures pursuant hereto. The
Company covenants that all shares of Common Stock that shall be so issuable
shall upon issue, be duly and validly authorized, issued and fully paid and
nonassessable. Without in any way limiting the foregoing, so long as any
Debentures remain outstanding the Company agrees to reserve and at all times
keep available solely for purposes of conversion of Debentures such number of
authorized but unissued shares of Common Stock that is set forth in the Purchase
Agreement.

                  (b)   DEFICIENCY. If the Company does not have a sufficient
number of shares of Common Stock available to satisfy the Company's obligations
to a Holder of Debentures upon receipt of a Conversion Notice or is otherwise
unable to issue such shares of Common Stock in accordance with the terms of this
Agreement such Holder shall be entitled to the rights and remedies set forth in
the Registration Rights Agreement.

         12.      NO REISSUANCE OF THE DEBENTURE. No Debentures acquired by the
Company by reason of redemption, purchase, exchange or otherwise shall be
reissued, and all such Debentures shall be retired.

         13.      NO IMPAIRMENT. The Company shall not intentionally take any
action which would impair the rights and privileges of the Debentures set forth
herein or the Holders thereof.

         14.      LIMITATIONS ON HOLDER'S RIGHT TO CONVERT.

                  (a)   Notwithstanding anything to the contrary contained
herein, no Debenture may be converted to the extent that, after giving effect to
shares of Common Stock to be issued pursuant to a Conversion Notice, the total
number of shares of Common Stock deemed beneficially owned by such Holder (other
than by virtue of the ownership of Debentures or ownership of other securities
that have limitations on a Holder's rights to exchange, convert or exercise
similar to those limitations set forth herein), together with all shares of
Common Stock deemed beneficially owned by the holder's "affiliates" (as defined
in Rule 144 of the Act) that would be aggregated for purposes of determining
whether a group under Section 13(d) of the Securities Exchange Act of 1934, as
amended, exists (an "aggregation party"), would exceed 9.9% (the "Restricted

                                       13
<PAGE>   14

Ownership Percentage") of the total issued and outstanding shares of the
Company's Common Stock; PROVIDED that (w) each holder shall have the right at
any time and from time to time to reduce its Restricted Ownership Percentage
immediately upon notice to the Company, (x) each Holder shall have the right at
any time and from time to time, to increase its Restricted Ownership Percentage
and otherwise waive in whole or in part the restrictions of this Section 14(a)
upon 61 days' prior notice to the Company or immediately in the event of the
announcement of a pending or proposed Change in Control Transaction, (y) each
holder can make subsequent adjustments pursuant to (w) or (x) any number of
times from time to time (which adjustment shall be effective immediately if it
results in a decrease in the percentage or shall be effective upon 61 days'
prior written notice or immediately in the event of the announcement of a
pending or proposed Change in Control Transaction if it results in an increase
in the percentage) and (z) each Holder may eliminate or reinstate this
limitation at any time and from time to time (which elimination will be
effective upon 61 days' prior notice and which reinstatement will be effective
immediately). Without limiting the foregoing, in the event of the announcement
of a pending or proposed Change in Control Transaction, any Holder may reinstate
immediately (in whole or in part) the requirement that any increase in its
Restricted Ownership Percentage be subject to 61 days' prior written notice,
notwithstanding such Change in Control Transaction, without imposing such
requirement on, or otherwise changing such Holder's rights with respect to, any
other Change in Control Transaction. For this purpose, any material modification
of the terms of a Change in Control Transaction will be deemed to result in a
new Change in Control Transaction. The term "deemed beneficially owned" as used
in this Debenture shall exclude shares that might otherwise be deemed
beneficially owned by reason of the convertibility of the Debentures. The
Company shall provide all Holders with the earlier of (i) 20 days' prior written
notice of any such Change in Control Transaction, to the extent the Company has
prior knowledge of a Change in Control Transaction; or (ii) notice on the day
immediately following the Company's learning of any such transaction, but only
after, in the case of (i) and (ii), such Change in Control Transaction has been
publicly disclosed.

                  (b)   Each time (a "Covenant Time") the Holder makes a
Triggering Acquisition (as defined below) of shares of Common Stock (the
"Triggering Shares"), the Holder will be deemed to covenant that it will not,
during the balance of the day on which such Triggering Acquisition occurs, and
during the 61-day period beginning immediately after that day, acquire
additional shares of Common Stock pursuant to rights-to-acquire existing at that
Covenant Time, if the aggregate amount of such additional shares so acquired
(without reducing that amount by any dispositions) would exceed (x) the
Restricted Ownership Percentage of the number of shares of Common Stock
outstanding at that Covenant Time (including the Triggering Shares) minus (y)
the number of shares of Common Stock actually owned by the Holder at that
Covenant Time (regardless of how or when acquired, and including the Triggering
Shares). A "Triggering Acquisition" means the giving of a Conversion Notice or
any other acquisition of Common Stock by the Holder or an aggregation party;
provided, however, that with respect to the giving of such Conversion Notice, if

                                       14
<PAGE>   15

the associated issuance of shares of Common Stock does not occur, such event
shall cease to be a Triggering Acquisition and the related covenant under this
paragraph shall terminate. At each Covenant Time, the holder shall be deemed to
waive any right it would otherwise have to acquire Common Shares to the extent
that such acquisition would violate any covenant given by the holder under this
paragraph. Notwithstanding anything to the contrary, in the event of a conflict
between any covenant given under this paragraph and any obligation of the Holder
to convert this Debenture, the former shall supersede the latter, and the latter
shall be reduced accordingly. For the avoidance of doubt:

                        (i)   The covenant to be given pursuant to this
paragraph will be given at every Covenant Time and shall be calculated based on
the circumstances then in effect. The making of a covenant at one Covenant Time
shall not terminate or modify any prior covenants.

                        (ii)  The holder may therefore from time to time be
subject to multiple such covenants, each one having been made at a different
Covenant Time, and some possibly being more restrictive than others. The holder
must comply with all such covenants then in effect.

                  (c)   Under certain circumstances specified in Section 3.14 of
the Purchase Agreement, certain Debentures that are the subject of a Conversion
Notice must be converted for cash.

         15.      OBLIGATIONS ABSOLUTE. No provision of this Debenture shall
alter or impair the obligation of the Company, which is absolute and
unconditional, to pay the principal of, and interest and default payments on,
this Debenture at the time, place and rate, and in the manner, herein
prescribed.

         16.      WAIVERS OF DEMAND, ETC. The Company hereby expressly and
irrevocably waives demand and presentment for payment, notice of nonpayment,
protest, notice of protest, notice of dishonor, notice of acceleration or intent
to accelerate, bringing of suit and diligence in taking any action to collect
amounts called for hereunder and will be directly and primarily liable for the
payment of all sums owing and to be owing hereon, regardless of and without any
notice, diligence, act or omission as or with respect to the collection of any
amount called for hereunder.

         17.      REPLACEMENT DEBENTURE. In the event that any Holder notifies
the Company that its Debenture(s) have been lost, stolen or destroyed,
replacement Debenture(s) identical in all respects to the original Debenture(s)
(except for registration number and Outstanding Principal Amount, if different
than that shown on the original Debenture(s)), shall be issued to the Holder,
provided that the Holder executes and delivers to the Company an agreement
reasonably satisfactory to the Company to indemnify the Company from any loss
incurred by it in connection with such Debenture.

         18.      PAYMENT OF EXPENSES; ISSUE TAXES. The Company agrees to pay
all debts and expenses, including attorneys' fees, which may be incurred by the
Holder in enforcing the provisions of this Debenture and/or collecting any
amount due under this Debenture, the Purchase Agreement, any Warrant or the

                                       15
<PAGE>   16

Registration Rights Agreement. The Company shall pay any and all issue and other
taxes (excluding any income, franchise or similar taxes) that maybe payable in
respect of any issue or delivery of shares of Common Stock on conversion of any
Debenture pursuant hereto.

         19.      DEFAULTS. If one or more of the following described "Events of
Default" shall occur:

                  (a)   The Company shall default in the payment of (i) interest
                        on this Debenture (subject to the Company's option to
                        pay PIK Interest), and such default shall continue for
                        five (5) business days after the due date thereof, or
                        (ii) the principal of this Debenture; or

                  (b)   Any of the representations or warranties made by the
                        Company herein, in the Purchase Agreement, the
                        Registration Rights Agreement, any Warrant or in any
                        certificate or financial or other statements heretofore
                        or hereafter furnished by or on behalf of the Company in
                        connection with the execution and delivery of this
                        Debenture or such other documents shall be false or
                        misleading in any material respect at the time made; or

                  (c)   The Company shall fail to materially perform or observe
                        any covenant or agreement in the Purchase Agreement or
                        the Registration Rights Agreement, or any other
                        covenant, term, provision, condition, agreement or
                        obligation of the Company under this Debenture and such
                        failure shall continue uncured for a period of ten (10)
                        business days after notice from the Holder of such
                        failure; or

                  (d)   The Company shall (1) become insolvent; (2) admit in
                        writing its inability to pay its debts generally as they
                        mature; (3) make an assignment for the benefit of
                        creditors or commence proceedings for its dissolution;
                        or (4) apply for or consent to the appointment of a
                        trustee, liquidator or receiver for it or for a
                        substantial part of its property or business; or

                  (e)   A trustee, liquidator or receiver shall be appointed for
                        the Company or for a substantial part of its property or
                        business without its consent and shall not be discharged
                        within thirty (30) days after such appointment; or

                  (f)   Any governmental agency or any court of competent
                        jurisdiction at the instance of any governmental agency
                        shall assume custody or control of the whole or any
                        substantial portion of the properties or assets of the
                        Company and shall not be dismissed within thirty (30)
                        days thereafter; or

                                       16
<PAGE>   17

                  (g)   The Company shall sell or otherwise transfer all or
                        substantially all of its assets; or

                  (h)   Bankruptcy, reorganization, insolvency or liquidation
                        proceedings or other proceedings, or relief under any
                        bankruptcy law or any law for the relief of debt shall
                        be instituted by or against the Company and, if
                        instituted against the Company shall not be dismissed
                        within thirty (30) days after such institution, or the
                        Company shall by any action or answer approve of,
                        consent to, or acquiesce in any such proceedings or
                        admit to any material allegations of, or default in
                        answering a petition filed in any such proceeding; or

                  (i)   The Company shall be in default of any of its
                        indebtedness, and the holders thereof shall have
                        accelerated such indebtedness; or

                  (j)   The Company shall be in material default of any of its
                        indebtedness that gives the holder thereof the right to
                        accelerate such indebtedness; or

                  (k)   A "going private" transaction under Rule 13e-3
                        promulgated pursuant to the Exchange Act shall have been
                        announced; or

                  (l)   A tender offer by the Company under Rule 13e-4
                        promulgated pursuant to the Exchange Act shall have been
                        announced;

THEN, or at any time thereafter, and in each and every such case, unless such
Event of Default shall have been waived in writing by the Holder (which waiver
shall not be deemed to be a waiver of any subsequent default) at the option of
the Holder and in the Holder's sole discretion, the Holder may consider the
Debenture immediately due and payable, without presentment, demand, protest or
notice of any kind, all of which are hereby expressly waived, anything herein or
in any other instruments contained to the contrary notwithstanding, and the
Holder may immediately, and without expiration of any period of grace, enforce
any and all of the Holder's rights and remedies provided herein or any other
rights or remedies afforded by law. In such event, the Debenture shall be
redeemed at a redemption price per Debenture equal to 125% of the Outstanding
Principal Amount of the Debenture, plus accrued but unpaid interest and default
payments on the Debenture.

         20.      SAVINGS CLAUSE. In case any provision of this Debenture is
held by a court of competent jurisdiction to be excessive in scope or otherwise
invalid or unenforceable, such provision shall be adjusted rather than voided,
if possible, so that it is enforceable to the maximum extent possible, and the
validity and enforceability of the remaining provisions of this Debenture will
not in any way be affected or impaired thereby, and such provision shall remain
effective in all other jurisdictions.

         21.      ENTIRE AGREEMENT. This Debenture and the agreements referred
to in this Debenture constitute the full and entire understanding and agreement

                                       17
<PAGE>   18

between the Company and the Holder with respect to the subject hereof. Neither
this Debenture nor any term hereof may be amended, waived, discharged or
terminated other than by a written instrument signed by the Company and the
Holder.

         22.      ASSIGNMENT, ETC. The Holder (but not the Company) may without
notice, transfer or assign this Debenture or any interest herein and may
mortgage, encumber or transfer any of its rights or interest in and to this
Debenture or any part hereof and, without limitation, each assignee, transferee
and mortgagee (which may include any affiliate of the Holder) shall have the
right to transfer or assign its interest. Each such assignee, transferee and
mortgagee shall have all of the rights of the Holder under this Debenture. The
Company agrees that, subject to compliance with the Purchase Agreement, after
receipt by the Company of written notice of assignment from the Holder or from
the Holder's assignee, all principal, interest and other amounts which are then
and thereafter become due under this Debenture shall be paid to such assignee at
the place of payment designated in such notice. This Debenture shall be binding
upon the Company and its successors and affiliates and shall inure to the
benefit of the Holder and its successors and assigns.

         23.      NO WAIVER. No failure on the part of the Holder to exercise,
and no delay in exercising any right, remedy or power hereunder shall operate as
a waiver thereof, nor shall any single or partial exercise by the Holder of any
right, remedy or power hereunder preclude any other or future exercise of any
other right, remedy or power. Each and every right, remedy or power hereby
granted to the Holder or allowed it by law or other agreement shall be
cumulative and not exclusive of any other, and may be exercised by the Holder
from time to time.

         24.      CERTIFICATE FOR CONVERSION PRICE ADJUSTMENT. The Company
shall, upon the written request at any time of any Holder of Debentures, furnish
or cause to be furnished to such Holder a certificate prepared by the chief
financial officer of Company setting forth any adjustments or readjustments of
the Conversion Price pursuant to this Debenture.

         25.      NOTICES. The Company shall distribute to the Holders of
Debentures copies of all notices, materials, annual and quarterly reports, proxy
statements, information statements and any other documents distributed generally
to the holders of shares of Common Stock of the Company, at such times and by
such method as such documents are distributed to such holders of such Common
Stock, but shall not directly or indirectly provide material non-public
information to the Holder without such Holder's prior written consent.

         26.      SPECIFIC ENFORCEMENT. The Company agrees that irreparable
damage would occur in the event that any of the provisions of this Debenture
were not performed in accordance with their specific terms or were otherwise
breached. It is accordingly agreed that the Holders of Debentures shall be
entitled to swift specific performance, injunctive relief or other equitable
remedies to prevent or cure breaches of the provisions of this Debenture and to
enforce specifically the terms and provisions hereof, this being in addition to
any other remedy to which any of them may be entitled under agreement, at law or
in equity.

                                       18
<PAGE>   19

         27.      MISCELLANEOUS. Unless otherwise provided herein, any notice or
other communication to a party hereunder shall be sufficiently given if in
writing and personally delivered, facsimiled or mailed to said party by
certified mail, return receipt requested, at its address set forth herein or
such other address as either may designate for itself in such notice to the
other and communications shall be deemed to have been received when delivered
personally or, if sent by mail or facsimile, then when actually received by the
party to whom it is addressed. Whenever the sense of this Debenture requires,
words in the singular shall be deemed to include the plural and words in the
plural shall be deemed to include the singular. Paragraph headings are for
convenience only and shall not affect the meaning of this document.

         28.      GOVERNING LAW; CONSENT TO JURISDICTION. This Debenture shall
be governed by and construed and enforced in accordance with the laws of the
State of New York applicable to contracts to be executed and performed entirely
within such state. The Company (i) hereby irrevocably submits to the exclusive
jurisdiction of the state and federal court located in New York County, New York
for the purposes of any suit, action or proceeding arising out of or related to
this Debenture and (ii) hereby waives, and agrees not to assert in any such
suit, action or proceeding, any claim that it is not personally subject to the
jurisdiction of such court, that the suit, action or proceeding is brought in an
inconvenient forum or that the venue of the suit, action or proceeding is
improper. The Company consents to process being served in any such suit, action
or proceeding by mailing a copy thereof to such party as provided herein and
agrees that such service shall constitute good and sufficient service of process
and notice thereof. Nothing in this paragraph shall affect or limit any right to
serve process in any other manner permitted by law.

                             SIGNATURE PAGE FOLLOWS

                                       19
<PAGE>   20

         IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed by an officer thereunto duly authorized.

                                       U.S. PLASTIC LUMBER CORPORATION

                                       By: /s/ Bruce C. Rosetto
                                          -------------------------------------
                                             Name:  Bruce C. Rosetto
                                              Title:  Vice President and
                                                      General Counsel

                  SIGNATURE PAGE TO 5% CONVERTIBLE DEBENTURE OF
                        U.S. PLASTIC LUMBER CORPORATION

                                       20
<PAGE>   21

                                    EXHIBIT 1

                      (To be Executed by Registered Holder
                         in order to Convert Debenture)

                                CONVERSION NOTICE
                                       FOR
                  5% CONVERTIBLE DEBENTURE DUE February 2, 2005

The undersigned, as Holder of the 5% Convertible Debenture Due February 2, 2005
of U.S. PLASTIC LUMBER Corporation (the "Company"), in the outstanding principal
amount of U.S.$7,500,000 (the "Debenture"), hereby irrevocably elects to convert
that portion of the outstanding principal amount of the Debenture shown on the
next page into shares of Common Stock, $0.0001 par value per share (the "Common
Stock"), of the Company according to the conditions of the Debenture, as of the
date written below. The undersigned hereby requests that share certificates for
the Common Stock to be issued to the undersigned pursuant to this Conversion
Notice be issued in the name of, and delivered to, the undersigned or its
designee as indicated below. If shares are to be issued in the name of a person
other than the undersigned, the undersigned will pay all transfer taxes payable
with respect thereto. No fee will be charged to the Holder for any conversion,
except for transfer taxes, if any.

Conversion Information:             NAME OF HOLDER:____________________________

                                    By:________________________________________
                                        Print Name:
                                        Print Title:

                                    Print Address of Holder:

                                     __________________________________________

                                     __________________________________________

                                     Issue Common Stock to: ___________________

                                     at:_______________________________________

                                     Electronically transmit and credit
Common Stock to:                      ________________  at: __________________

<PAGE>   22

                                     __________________________________________
                                     Date of Conversion

                                     __________________________________________
                                     Applicable Conversion Rate

                THE COMPUTATION OF THE NUMBER OF COMMON SHARES TO
                  BE RECEIVED IS SET FORTH ON THE ATTACHED PAGE

                                       2
<PAGE>   23

PAGE 2 TO CONVERSION NOTICE FOR: ______________________________________________
                                         (NAME OF HOLDER)

              COMPUTATION OF NUMBER OF COMMON SHARES TO BE RECEIVED

<TABLE>
<CAPTION>
<S>      <C>                                                                                           <C>
A.       Outstanding Principal Amount converted:                                                       $
B.       Accrued, unpaid interest on Outstanding Principal Amount converted:                           $
C.       Default payments due Holder on Outstanding Principal Amount converted:                        $

                                                                                                       -----------------
TOTAL DOLLAR AMOUNT CONVERTED (TOTAL OF A + B + C)                                                     $

                                                                                                       =================

EXCHANGE PRICE                                                                                         $

Number of Shares of Common Stock   =    TOTAL DOLLAR AMOUNT CONVERTED                                  $
=                                                                                                      $
                                        Conversion Price
</TABLE>

NUMBER OF SHARES OF COMMON STOCK   =   ______________________________________

If the conversion is not being settled by DTC, please issue and deliver _____
certificate(s) for shares of Common Stock in the following amount(s):

_______________________________________________________________________________

_______________________________________________________________________________

                                       3
<PAGE>   24
_______________________________________________________________________________

_______________________________________________________________________________

Please issue and deliver _____ new Debenture(s) in the following amounts:

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

                                       4

<PAGE>   25

                                    EXHIBIT 2

                                  PIK STATEMENT

Date:______________

To: [NAME OF HOLDER OF DEBENTURE] ("Holder")

RE:       5% CONVERTIBLE DEBENTURE DUE FEBRUARY 2, 2005 ("DEBENTURE") OF U.S.
          PLASTIC LUMBER CORPORATION (THE "COMPANY"), IN THE FACE PRINCIPAL
          AMOUNT OF US$7,500,000.

                  In lieu of paying interest on the above-referenced Debenture
in coin or currency, the Company hereby elects to pay interest on the Debenture,
for the Interest Payment Date indicated below, by having the amount of such
interest added to the Outstanding Principal Amount due under the Debenture. The
Company hereby certifies to the Holder, its successors and assigns that the
Outstanding Principal Amount due under the Debenture after delivery of this PIK
Statement equals the amount indicated below. Capitalized terms used in this PIK
Statement and not otherwise defined shall have the meaning ascribed thereto in
the Debenture.

         Interest Payment Date:                                  _____________

         Outstanding Principal Amount prior

         to issuance of this PIK Statement:                   US$_____________

         PIK Interest:                                        US$_____________

         Outstanding Principal Amount after

         issuance of this PIK Statement:                      US$_____________

                  IN WITNESS WHEREOF, this PIK Statement has been duly executed
and delivered on the date first written above.

                                                U.S. PLASTIC LUMBER CORPORATION

                                                By: ___________________________
                                                     Name:
                                                     Title:

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