Document:

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                                                                 Exhibit 4.2

                                                           Execution Version

                                  EXHIBIT A
                                  ---------

NEITHER THESE SECURITIES NOR THE SECURITIES ISSUABLE UPON CONVERSION OF
THESE SECURITIES HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE
COMMISSION OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN
EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED
(THE "SECURITIES ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT
PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR
PURSUANT TO AN AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO,
THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND IN ACCORDANCE WITH
APPLICABLE STATE SECURITIES LAWS AS EVIDENCED BY A LEGAL OPINION OF COUNSEL
TO THE TRANSFEROR TO SUCH EFFECT, THE SUBSTANCE OF WHICH SHALL BE REASONABLY
ACCEPTABLE TO THE BORROWER. THESE SECURITIES AND THE SECURITIES ISSUABLE
UPON CONVERSION OF THESE SECURITIES MAY BE PLEDGED IN A MANNER CONSISTENT
WITH THE SECURITIES ACT IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT
SECURED BY SUCH SECURITIES.

No. [ ]                                                                 $[ ]
                                                    Original Issue Date: [ ]

                           ZOLTEK COMPANIES, INC.
                     SENIOR CONVERTIBLE NOTE DUE [ ](1)

                  THIS NOTE is one of a series of duly authorized and issued
notes of Zoltek Companies, Inc., a Missouri corporation (the "BORROWER"),
designated as its Senior Convertible Notes due [______](2), in the original
aggregate principal amount of [Five Million Dollars ($5,000,000)][Fifteen
Million Dollars ($15,000,000)][Twenty Million Dollars ($20,000,000)]
(collectively, the "NOTES" and each note comprising the Notes, a "NOTE").

                  FOR VALUE RECEIVED, the Borrower promises to pay to the
order of [ ] or its registered assigns (the "LENDER"), the principal sum of
[ ] ($), on [ ](3) or such earlier date as this Note is required to be
repaid as provided hereunder (the "MATURITY DATE"), and to pay interest to

<FN>
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(1) 42nd month anniversary of the Original Issue Date

(2) 42nd month anniversary of the Original Issue Date

(3) 42nd month anniversary of the Original Issue Date

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the Lender on the principal amount of this Note outstanding from time to
time in accordance with the provisions hereof. All holders of Notes are
referred to collectively, as the "LENDERS." This Note is subject to the
following additional provisions:

                  1.       Definitions. In addition to the terms defined
                           -----------
elsewhere in this Note: (a) capitalized terms that are used but not
otherwise defined herein have the meanings given to such terms in the Loan
and Warrant Agreement, dated as of the September 29, 2005, among the
Borrower, the lenders identified therein and Omicron Master Trust, as
Administrative Agent thereunder (the "LOAN AGREEMENT"), and (b) the
following terms have the meanings indicated below:

         "BANKRUPTCY EVENT" means any of the following events: (a) the
Borrower or any Subsidiary commences a case or other proceeding under any
bankruptcy, reorganization, arrangement, adjustment of debt, relief of
debtors, dissolution, insolvency or liquidation or similar law of any
jurisdiction relating to the Borrower or any Subsidiary thereof; (b) there
is commenced against the Borrower or any Subsidiary any such case or
proceeding that is not dismissed within 60 days after commencement; (c) the
Borrower or any Subsidiary is adjudicated by a court of competent
jurisdiction insolvent or bankrupt or any order of relief or other order
approving any such case or proceeding is entered; (d) the Borrower or any
Subsidiary suffers any appointment of any custodian or the like for it or
any substantial part of its property that is not discharged or stayed within
60 days; (e) under applicable law the Borrower or any Subsidiary makes a
general assignment for the benefit of creditors; (f) the Borrower or any
Subsidiary fails to pay, or states that it is unable to pay or is unable to
pay, its debts generally as they become due; (g) the Borrower or any
Subsidiary calls a meeting of its creditors with a view to arranging a
composition, adjustment or restructuring of its debts; or (h) the Borrower
or any Subsidiary, by any act or failure to act, expressly indicates its
consent to, approval of or acquiescence in any of the foregoing or takes any
corporate or other action for the purpose of effecting any of the foregoing.

         "CHANGE OF CONTROL" means the occurrence of any of the following in
one or a series of related transactions: (i) an acquisition after the date
hereof by an individual or legal entity or "group" (as described in Rule
13d-5(b)(1) under the Exchange Act) of more than 20% of the voting rights or
equity interests in the Borrower; (ii) a replacement of more than one-half
of the members of the Borrower's board of directors in a single election of
directors that is not approved by those individuals who are members of the
board of directors on the date hereof (or other directors previously
approved by such individuals); (iii) a Fundamental Transaction, a merger or
consolidation of the Borrower or any Subsidiary or a sale of more than 20%
of the assets of the Borrower in one or a series of related transactions,
unless following such transaction or series of transactions, the holders of
the Borrower's securities prior to the first such transaction continue to
hold at least two-thirds of the voting rights and equity interests in the
surviving entity or acquirer of such assets; (iv) a recapitalization,
reorganization or other transaction involving the Borrower or any Subsidiary
that constitutes or results in a transfer of more than 20% of the voting
rights or equity interests in the Borrower, unless following such
transaction or series of transactions, the holders of the Borrower's
securities prior to the first such transaction continue to hold at least
two-thirds of the voting rights and equity interests in the surviving entity
or acquirer of such assets; (v) consummation of a "Rule 13e-3 transaction"
as defined in Rule 13e-3 under the Exchange Act with respect to the
Borrower, or (vi) the execution by the Borrower or its

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controlling shareholders of an agreement providing for or reasonably likely
to result in any of the foregoing events.

         "CLOSING DATE" shall mean the [First Closing Date][Second Closing
Date][Third Closing Date][Fourth Closing Date](4).

         "CLOSING PRICE" means, for any date, the price determined by the
first of the following clauses that applies: (a) if the Common Stock is then
listed or quoted on an Eligible Market, the closing sale price per share of
the Common Stock for such date (or the nearest preceding date) on the
primary Eligible Market or exchange on which the Common Stock is then listed
or quoted; (b) if prices for the Common Stock are then quoted on the OTC
Bulletin Board, the closing sale price per share of the Common Stock for
such date (or the nearest preceding date) so quoted; (c) if prices for the
Common Stock are then reported in the "Pink Sheets" published by the
National Quotation Bureau Incorporated (or a similar organization or agency
succeeding to its functions of reporting prices), the most recent sale price
per share of the Common Stock so reported; or (d) in all other cases, the
fair market value of a share of Common Stock as determined by an independent
qualified appraiser selected in good faith and paid for by a majority in
interest of the Lenders.

         "COMMON STOCK" means the common stock of the Borrower, $0.01 par
value per share, and any securities into which such common stock may
hereafter be reclassified.

         "COMMON STOCK EQUIVALENTS" means any securities of the Borrower or
a subsidiary thereof which entitle the holder thereof to acquire Common
Stock at any time, including without limitation, any debt, preferred stock,
rights, options, warrants or other instrument that is at any time
convertible into or exchangeable for, or otherwise entitles the holder
thereof to receive, Common Stock or other securities that entitle the holder
to receive, directly or indirectly, Common Stock.

         "CONVERSION DATE" means the date a Conversion Notice together with
the Conversion Schedule is delivered to the Borrower in accordance with
Section 5(a).

         "CONVERSION NOTICE" means a written notice in the form attached
hereto as Exhibit A.
          ---------

         "CONVERSION PRICE" means $12.50(5), subject to adjustment from time
to time pursuant to Section 11.

         "DEFAULT" means any event or condition which constitutes an Event
of Default or that upon notice, lapse of time or both would, unless cured or
waived, become an Event of Default.

         "ELIGIBLE MARKET" means any of the New York Stock Exchange, the
American Stock Exchange, the Nasdaq National Market or the Nasdaq SmallCap
Market.

         "EQUITY CONDITIONS ARE SATISFIED" means, as of any date of
determination, that each of the following conditions is (or would be)
satisfied on such date, if the Borrower were to issue on

<FN>
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(4)  To be determined based on the Closing in which the Note is issued.

(5)  The form of note will be the same for the four closings but the
     Conversion Price with respect to the First and Second Closings will
     be $12.50 and with respect to the Third Closing and Fourth Closing,
     will be based on the closing prices immediately preceding the Third
     Closing Date and Fourth Closing Date, respectively as provided in
     the Loan Agreement.

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such date all of the Underlying Shares then issuable upon (1) conversion in
full of the outstanding principal amount of all convertible debt issued by
the Borrower (including the Notes), (2) the exercise of all options and
warrants for Common Stock (including the Warrants) and (3) the payment of
accrued and unpaid interest on such Interest Payment Date under all
convertible debt (including the Notes) of the Borrower: (i) the number of
authorized but unissued and otherwise unreserved shares of Common Stock is
sufficient for such issuance, (ii) the Common Stock is listed or quoted (and
is not suspended from trading) on an Eligible Market and such shares of
Common Stock are approved for listing on such Eligible Market upon issuance,
(iii) such Common Stock is registered for resale under the Registration
Statement, (iv) such issuance would be permitted in full without violating
Section 5(b)(i) or Section 5(b)(ii) hereof or the rules or regulations of
the Eligible Market on which such shares are listed or quoted, (v) both
immediately before and after giving effect thereto, no Default shall or
would exist, and (vi) no public announcement of a pending or proposed Change
of Control transaction has occurred that has not been consummated.

         "EVENT EQUITY VALUE" means the average of the Closing Prices for
the five consecutive Trading Days preceding either: (a) the date of an Event
Notice or the date the Borrower becomes obligated to pay the Event Price
under Section 7(b), as applicable, or (b) the date on which the Event Price
with respect thereto (together with any other payments, expenses and
liquidated damages then due and payable under the Transaction Documents) is
paid in full, whichever is greater.

         "EVENT OF DEFAULT" means any one of the following events (whatever
the reason and whether it shall be voluntary or involuntary or effected by
operation of law or pursuant to any judgment, decree or order of any court,
or any order, rule or regulation of any administrative or governmental
body):

                  (i)      any default in the payment (free of any claim of
subordination), when the same becomes due and payable (whether on a
Conversion Date or the Borrower Conversion Date, a Prepayment Date, the
Maturity Date or by acceleration or prepayment or otherwise), of principal,
interest or liquidated damages in respect of this Note which default
continues unremedied for a period of three Trading Days after the date on
which written notice of such default is first given to the Borrower by the
Holder;

                  (ii)     the Borrower or any Subsidiary (1) fails to pay when
due any monetary obligation (regardless of amount) under any currently
existing or hereafter arising debenture or note (other than a Note) or any
mortgage, credit agreement or other facility, indenture agreement, factoring
agreement or other instrument under which there may be issued, or by which
there may be secured or evidenced, any Indebtedness or under any long term
leasing or factoring arrangement, if the aggregate amount of the obligations
and liabilities of the Borrower and the Subsidiaries thereunder exceed
$350,000 (each of the foregoing a "MATERIAL DEBT AGREEMENT"), or (2) fails
                                   -----------------------
to observe or perform any other obligation under any Material Debt
Agreement, and such failure results in the obligations thereunder becoming
or being declared due and payable prior to the date on which they would
otherwise become due and payable;

                  (iii)    the occurrence or entering into by the Borrower or
any Subsidiary, or consummation of, any Change of Control transaction;

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                  (iv)     the Borrower shall fail to observe or perform any
covenant, condition or agreement contained in Section 4.4, 4.6, 4.8, 4.9,
4.10, 4.12, 4.16, 4.17 or in Article 5 of the Loan Agreement;

                  (v)      the Borrower shall fail to observe or perform any
covenant, condition or agreement contained in any Transaction Document
(other than those specified in clause (i) or (iv) above and clause (xvii) or
(xxi) below), and such failure shall continue unremedied for a period of ten
Trading Days after the date on which written notice of such default is first
given to the Borrower by the Holder (it being understood that no prior
notice need be given in the case of a default that cannot reasonably be
cured within ten Trading Days);

                  (vi)     the occurrence and continuance of an Event of Default
under any other Note;

                  (vii)    any prepayment by the Borrower of any other Note or
any other Indebtedness (other than (a) the Borrower's outstanding
Indebtedness to Marshall and Isley Bank of St. Louis, and (b) the 2003
Debentures (as defined below) 2004 Debentures (as defined below), 2004 Notes
(as defined below) or 2005 Notes (as defined below) each in accordance with
their respective terms), issued by it or outstanding under any issuance of
securities in exchange for any Notes issued by it (other than Underlying
Shares upon conversion of such notes in accordance with their terms as in
effect on the Original Issue Date thereof), except in each case (1) if the
Borrower offers to the Lender in writing the same prepayment of this Note
and all other Notes then held by such Lender on the same economic terms on
which the Borrower prepays or offers to prepay (whichever is more favorable
to the holder of such Note) such Notes and (2) in accordance with the
prepayment provisions of Section 8 and 13 of this Note;

                  (viii)   any of the Borrower's representations and
warranties set forth in the Loan Agreement shall be incorrect in any
material respect as of the Original Issue Date;

                  (ix)     the occurrence of a Bankruptcy Event;

                  (x)      one or more judgments for the payment of money in an
aggregate amount in excess of (1) with respect to the existing litigation
pertaining to Scott Macon Securities, $850,000, or (2) in all other cases,
$350,000, shall be rendered against the Borrower or any Subsidiary or any
combination thereof (which shall not be fully covered by insurance without
taking into account any applicable deductibles) and the same shall remain
undischarged or unbonded for a period of 30 consecutive days during which
execution shall not be effectively stayed, or any action shall be legally
taken by a judgment creditor to attach or levy upon any assets of the
Borrower or any Subsidiary to enforce any such judgment;

                  (xi)     any Transaction Document shall cease, for any
reason, to be in full force and effect, or the Borrower shall so assert in
writing or shall disavow any of its obligations thereunder;

                  (xii)    the Common Stock shall not be listed or quoted, or
is suspended from trading, on an Eligible Market for a period of three
Trading Days (which need not be consecutive Trading Days);

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                  (xiii)   the Borrower fails to deliver a stock certificate
evidencing Underlying Shares to a Lender within three Trading Days after a
Conversion Date, or in the case of exercises under a Warrant, within three
Trading Days after a Date of Exercise under, and as such term is defined in,
such Warrant, or the conversion or exercise rights of the Lenders pursuant
to the terms hereof or the terms of the Warrants are otherwise suspended for
any reason (other than as set forth in Section 5 of this Note or Section 11
of the Warrant);

                  (xiv)    the Borrower fails to have available a sufficient
number of authorized but unissued and otherwise unreserved shares of Common
Stock available to issue Underlying Shares upon any conversion of Notes or
upon any exercise of Warrants;

                  (xv)     the Borrower effects or publicly announces its
intention to effect any exchange, recapitalization or other transaction that
effectively requires or rewards physical delivery of certificates evidencing
the Common Stock, unless following such transaction, the holders of the
Borrower's securities prior to the first such transaction continue to
beneficially own at least two-thirds of the voting rights and equity
interests in the surviving entity or acquirer of such assets;

                  (xvi)    a Registration Statement under the Registration
Rights Agreement is not declared effective by the Commission by the 365th
day following the First Closing Date, or is not effective as to all
Registrable Securities (as defined in the Registration Rights Agreement),
and available for use by the holders of Registrable Securities, for in
excess of an aggregate of 60 Trading Days (which need not be consecutive
Trading Days) during the Effectiveness Period (as defined in the
Registration Rights Agreement);

                  (xvii)   the Borrower fails to make any cash payment
required under the Transaction Documents (other than as set forth in
paragraph (i) above) and such failure is not cured within five Trading Days
after notice of such default is first given to the Borrower by a Lender;

                  (xviii)  there shall be an Event of Default under and as
defined in any debenture issued by the Borrower in respect of the Securities
Purchase Agreement dated as of December 19, 2003 (the "2003 SECURITIES
PURCHASE AGREEMENT") (such debentures, the "2003 DEBENTURES");

                  (xix)    there shall be an Event of Default under and as
defined in any debenture issued by the Borrower in respect of the Securities
Purchase Agreement dated as of March 11, 2004 (the "2004 SECURITIES PURCHASE
AGREEMENT") (such debentures, the "2004 DEBENTURES");

                  (xx)     there shall be an Event of Default under and as
defined in any note issued by the Borrower in respect of the Loan and
Warrant Agreement dated as of October 14, 2004 (the "2004 LOAN AGREEMENT")
(such notes, the "2004 NOTES");

                  (xxi)    there shall be an Event of Default under and as
defined in any note issued by the Borrower in respect of the Loan and
Warrant Agreement dated as of February 29, 2005 (the "2005 LOAN AGREEMENT")
(such notes, the "2005 NOTES"); or

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                  (xxii)   the Borrower shall agree to amend, waive or
otherwise modify the Shareholders Agreement other than in accordance with
Section 8.4 of the Loan Agreement.

         "GUARANTEE" of or by any Person shall mean any obligation,
contingent or otherwise, of such Person guaranteeing or having the economic
effect of guaranteeing any Indebtedness of any other Person (the "primary
obligor") in any manner, whether directly or indirectly, and including any
obligation of such Person, direct or indirect, (a) to purchase or pay (or
advance or supply funds for the purchase or payment of) such Indebtedness or
to purchase (or to advance or supply funds for the purchase of) any security
for the payment of such Indebtedness, (b) to purchase property, securities
or services for the purpose of assuring the owner of such Indebtedness of
the payment of such Indebtedness or (c) to maintain working capital, equity
capital or other financial statement condition or liquidity of the primary
obligor so as to enable the primary obligor to pay such Indebtedness,
provided, that the term Guarantee shall not include endorsements for
collection or deposit, in either case in the ordinary course of business.

         "INDEBTEDNESS" of any Person shall mean, without duplication, (a)
all obligations of such Person for borrowed money, (b) all obligations of
such Person evidenced by bonds, debentures, notes or similar instruments,
(c) all obligations of such Person upon which interest charges are
customarily paid, (d) all obligations of such Person under conditional sale
or other title retention agreements relating to property or assets purchased
by such Person, (e) all obligations of such Person issued or assumed as the
deferred purchase price of property or services (other than unsecured
accounts payable incurred in the ordinary course of business), (f) all
Indebtedness of others secured by (or for which the holder of such
Indebtedness has an existing right, contingent or otherwise, to be secured
by) any Lien on property owned or acquired by such Person, whether or not
the obligations secured thereby have been assumed, (g) all Guarantees by
such Person of Indebtedness of others, (h) all Capital Lease Obligations of
such Person, (i) all obligations of such Person in respect of interest rate
protection agreements, foreign currency exchange agreements or other
interest or exchange rate hedging arrangements that exceed amounts necessary
to hedge the Borrower's interest rate or cross-currency exposure and (j) all
obligations of such Person as an account party in respect of letters of
credit and bankers' acceptances. The Indebtedness of any Person shall
include the Indebtedness of any partnership in which such Person is a
general partner.

         "ORIGINAL ISSUE DATE" has the meaning set forth on the face of this
Note.

         "PRINCIPAL PAYMENT DATE" means any date on which payment of a
principal amount of this Note shall be due and payable by the Borrower in
accordance with Section 2.

         "VWAP" means, with respect to any date of determination, the daily
volume weighted average price (as reported by Bloomberg using the VAP
function) of the Common Stock on such date of determination, or if there is
no such price on such date of determination, then the daily volume weighted
average price on the date nearest preceding such date.

                  2.       Principal and Interest.
                           ----------------------

                           (a)     The Borrower shall pay interest to the
Lender on the aggregate then outstanding principal amount of this Note at
the rate of 7.5% per annum, payable quarterly in cash in arrears on each
March 31, June 30, September 30 and December 31 (each an "INTEREST PAYMENT
DATE"), beginning December 31, 2005, except if such date is not a Trading
Day, in which case such interest shall be payable on the next succeeding
Trading Day. Interest shall be

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calculated on the basis of a 360-day year for the actual number of days
elapsed and shall accrue daily commencing on the Original Issue Date.

                           (b)     The Borrower shall pay the principal
balance of this Note to the Holder in 10 equal quarterly installments (each,
a "QUARTERLY INSTALLMENT") commencing on the date fifteen (15) months
following the Closing Date and to continue for each of the 9 quarters
thereafter, except if such date is not a Trading Day, in which case such
principal shall be payable on the next succeeding Trading Day (each, a
"PRINCIPAL PAYMENT DATE"), until the outstanding principal balance of this
Note has been paid in full.

                           (c)     Subject to the conditions and limitations
set forth below, the Borrower may at its option, on each Interest Payment
Date, pay accrued interest on this Note either: (A) in cash, or (B) by
delivering by the Third Trading Day following the applicable Interest
Payment Date, a number of freely tradable shares of Common Stock equal to
the quotient obtained by dividing the amount of such interest by 93% of the
arithmetic average of the VWAP for each of the 20 consecutive Trading Days
immediately preceding (but not including) such Interest Payment Date and
(ii) on each Principal Payment Date, pay the applicable Quarterly
Installment on this Note, either (A) in cash, or (B) by delivery by the
Third Trading Day following the applicable Quarterly Installment Date, a
number of freely tradable shares of Common Stock equal to the quotient
obtained by dividing the amount of such Quarterly Installment by the lesser
of (i) 90% of the arithmetic average of the VWAP for each of the 20
consecutive Trading Days immediately preceding (but not including) such
Principal Payment Date and (ii) the Conversion Price. The Borrower must
deliver written notice to the Lender indicating the manner in which it
intends to pay interest or principal at least ten Trading Days prior to each
Interest Payment Date or Principal Payment Date, but the Borrower may
indicate in any such notice that the election contained therein shall
continue for subsequent Interest Payment Dates or Principal Payment Dates
until rescinded. Failure to timely provide such written notice shall be
deemed an irrevocable election by the Borrower to pay such interest or
principal in cash. All interest or principal payable in respect of the Notes
on any Interest Payment Date or Principal Payment Date must be paid in the
same manner.

                           (d)     Notwithstanding the foregoing, the Borrower
may not pay interest or principal in shares of Common Stock on any Interest
Payment Date, Principal Payment Date or in connection with any conversion of
all or any portion of this Note unless, (i) on the date thereof, the Equity
Conditions Are Satisfied, (ii) the closing price of the Common Stock for the
twenty (20) consecutive Trading Days immediately preceding the date thereof
shall exceed $12.50 per share (as adjusted pursuant to Section 11) and (iii)
the trading volume of the Common Stock for each Trading Day of such twenty
(20) consecutive Trading Day period immediately preceding the date thereof
exceeds 50,000 shares.

                  3.       Registration of Notes. The Borrower shall register
                           ---------------------
the Notes upon records maintained by the Borrower for that purpose (the
"NOTE REGISTER") in the name of each record Lender thereof from time to
time. The Borrower may deem and treat the registered Lender of this Note as
the absolute owner hereof for the purpose of any conversion hereof or any
payment of interest hereon, and for all other purposes, absent actual notice
to the contrary from such record Lender. The Borrower shall at any time and
from time to time, upon one Business Days' prior notice by the
Administrative Agent or any Lender, make the Note Register available for

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inspection by the Administrative Agent, such Lender or the representative(s)
of the Administrative Agent or such Lender, at the chief executive office of
the Borrower during normal business hours. The Administrative Agent shall be
permitted to rely on the information set forth in the Note Register.

                  4.       Registration of Transfers and Exchanges. The Borrower
                           ---------------------------------------
shall register the transfer of any portion of this Note in the Note Register
upon surrender of this Note to the Borrower at its address for notice set
forth herein. Upon any such registration or transfer, a new Note, in
substantially the form of this Note (any such new note, a "NEW NOTE"),
evidencing the portion of this Note so transferred shall be issued to the
transferee and a New Note evidencing the remaining portion of this Note not
so transferred, if any, shall be issued to the transferring Lender. The
acceptance of the New Note by the transferee thereof shall be deemed the
acceptance by such transferee of all of the rights and obligations of a
holder of a Note. The Borrower agrees that its prior consent is not required
for the transfer of any portion of this Note; provided, however, that the
                                              --------
Borrower shall be entitled to reasonable assurance, including an opinion of
counsel reasonably acceptable to Borrower, that such transfer complies with
applicable federal and state securities laws. This Note is exchangeable for
an equal aggregate principal amount of Notes of different authorized
denominations, as requested by the Lender surrendering the same. No service
charge or other fee will be imposed in connection with any such registration
of transfer or exchange.

                  5.       Conversion.
                           ----------

                           (a)     At the Option of the Lender. All or any
                                   ---------------------------
portion of the principal amount of this Note then outstanding shall be
convertible into shares of Common Stock at the Conversion Price (subject to
limitations set forth in Section 5(b)), at the option of the Lender, at any
time and from time to time from and after the Original Issue Date. The
Lender may effect conversions under this Section 5(a), by delivering to the
Borrower a Conversion Notice together with a schedule in the form of
Schedule 1 attached hereto (the "CONVERSION SCHEDULE"). Upon receipt of the
----------
Conversion Notice, any accured and unpaid interest hereunder payable with
respect to the principal amount of the Note to be converted shall, at the
option of the Borrower, be payable by the Borrower in cash or convertible
into that number of shares of Common Stock equal to the amount of such
payment divided by the Conversion Price. If the Lender is converting less
than all of the principal amount represented by this Note, or if a
conversion hereunder may not be effected in full due to the application of
Section 5(b), the Borrower shall honor such conversion to the extent
permissible hereunder and shall promptly deliver to the Lender a Conversion
Schedule indicating the principal amount which has not been converted.

                           (b)     Certain Conversion Restrictions.
                                   -------------------------------

                                   (i)      Notwithstanding anything to the
contrary contained herein, the number of shares of Common Stock that may be
acquired by a Lender upon any conversion of Notes (or otherwise in respect
hereof) shall be limited to the extent necessary to insure that, following
such conversion (or other issuance), the total number of shares of Common
Stock then beneficially owned by such Lender and its Affiliates and any
other Persons whose beneficial ownership of Common Stock would be aggregated
with such Lender's for purposes of Section 13(d) of the Exchange Act, does
not exceed 4.999% (the "THRESHOLD PERCENTAGE") or 9.999%

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(the "MAXIMUM PERCENTAGE") of the total number of issued and outstanding
shares of Common Stock (including for such purpose the shares of Common
Stock issuable upon such conversion). For such purposes, beneficial
ownership shall be determined in accordance with Section 13(d) of the
Exchange Act and the rules and regulations promulgated thereunder. Each
delivery of a Conversion Notice hereunder will constitute a representation
by the Lender that it has evaluated the limitation set forth in this
paragraph and determined that issuance of the full number of shares of
Common Stock requested in such Conversion Notice is permitted under this
paragraph. The Borrower's obligation to issue shares of Common Stock in
excess of the limitation referred to in this Section shall be suspended (and
shall not terminate or expire notwithstanding any contrary provisions
hereof) until such time, if any, as such shares of Common Stock may be
issued in compliance with such limitation. The Lender shall have the right
(x) at any time and from time to time to reduce its Maximum Percentage
immediately upon notice to the Borrower in the event and only to the extent
that Section 16 of the Exchange Act or the rules promulgated thereunder (or
any successor statute or rules) is changed to reduce the beneficial
ownership percentage threshold thereunder to a percentage less than 9.99%
and (y) at any time and from time to time, to waive the provisions of this
Section insofar as they relate to the Threshold Percentage or to increase
its Threshold Percentage (but not in excess of the Maximum Percentage)
unless the Lender shall have, by written instrument delivered to the
Borrower, irrevocably waived its rights to so increase its Threshold
Percentage, but (i) any such waiver or increase will not be effective until
the 61st day after such notice is delivered to the Borrower, and (ii) any
such waiver or increase or decrease will apply only to the Lender and not to
any other Lender of Notes; but (i) any such waiver or increase will not be
effective until the 61st day after such notice is delivered to the Borrower,
and (ii) any such waiver or increase or decrease will apply only to the
Lender and not to any other Lender of Notes.

                                   (ii)     Notwithstanding anything to the
contrary in this Note, if the Borrower has not previously obtained
Shareholder Approval (as defined below), then the Borrower may not issue
shares of Common Stock in excess of (a) the Issuable Maximum or (b) a number
of shares above which the issuance of one additional share would cause a
Change of Control (a "Change of Control Threshold") upon conversion of this
Note at a conversion price which is less than the Closing Price on the
Trading Day immediately preceding the Original Issue Date (the "THRESHOLD
PRICE"). The "Issuable Maximum" means, as of any date, a number of shares of
Common Stock equal to 19.99% of the outstanding shares of Common Stock
immediately preceding the Closing Date, less such number of shares of Common
Stock as have been issued at a price below the Threshold Price (1) upon
exercise of the Warrants issued under the Loan Agreement and warrants issued
under the 2003 Securities Purchase Agreement, the 2004 Securities Purchase
Agreement, the 2004 Loan Agreement, and the 2005 Loan Agreement, (2) upon
conversion of the 2003 Debentures, the 2004 Debentures, the 2004 Notes and
the 2005 Notes and (3) upon conversion of the Notes, or in payment of
interest thereunder. Each Lender shall be entitled to a portion of the
Issuable Maximum or Change of Control Threshold, as applicable, equal to the
quotient obtained by dividing: (x) the principal amount of Notes issued and
sold to such Lender on the Original Issue Date by (y) the aggregate
principal amount of all Notes issued and sold by the Borrower on the
Original Issue Date. If any Lender shall no longer hold Notes, then such
Lender's remaining portion of the Issuable Maximum or Change of Control
Threshold, as applicable, (other than those represented by the remaining
portion of the

                                     10

<PAGE>
<PAGE>

Warrant and the other warrants referenced in clause (1) above) shall be
allocated pro-rata among the remaining Lenders, giving effect to the
Borrower's desire to allocate this limitation among the class of securities
known as the Notes. If on any Conversion Date, or at such time as a Lender
shall notify the Borrower that the condition in (A) following this clause
shall be in effect: (A) the aggregate number of shares of Common Stock that
would then be issuable upon conversion in full of all then outstanding
principal amount of Notes would exceed the Issuable Maximum or would exceed
the Change of Control Threshold on such date and (B) the Borrower shall not
have previously obtained the vote of shareholders applicable to approve the
issuance of shares of Common Stock in excess of the Issuable Maximum or
Change of Control Threshold, as applicable, pursuant to the terms hereof
(the "SHAREHOLDER APPROVAL"), then, the Borrower shall, on such Conversion
Date or on any Conversion Date prior to the receipt by the Borrower of the
Shareholder Approval, issue to the Lender a number of shares of Common Stock
equal to the Issuable Maximum or Change of Control Threshold, as applicable,
and, with respect to the remainder of the principal amount of Notes then
held by the Lenders for which a conversion would result in an issuance of
shares of Common Stock in excess of the Issuable Maximum or Change of
Control Threshold, the Borrower must seek Shareholder Approval in accordance
with subsection (iii) below. The Borrower and the Lender understand and
agree that shares of Common Stock issued to and then held by the Lender as a
result of conversions of the Notes shall not be entitled to cast votes on
any resolution to obtain Shareholder Approval pursuant hereto.

                                   (iii)    Shareholder Approval.
                                            --------------------

                                            (1)      The Borrower shall use
its best efforts to obtain as soon as possible but in no event later than 90
days following the date of the Loan Agreement or 120 days in the event the
proxy materials shall be reviewed by the Commission, shareholder approval of
the issuance of the Underlying Shares (the "SHAREHOLDER PROPOSAL"), which
approval shall meet the requirements of Nasdaq's Rule 4350(i) of Nasdaq set
forth in the NASD Manual (the "SHAREHOLDER APPROVAL DATE").

                                            (2)      As soon as practicable
following the date of the Loan Agreement, but in no event more than 30 days
following the date of the Loan Agreement, the Borrower shall prepare and
file with the Commission proxy materials calling a special meeting (the
"SPECIAL MEETING") of its shareholders seeking approval of the Shareholder
Proposal. The Borrower shall use its reasonable best efforts to cause such
proxy materials to reach the "no further comment" stage as soon as possible
(the "CLEARANCE DATE") and to hold the Special Meeting as soon as possible
following the Clearance Date, but in no event later than 45 days following
the Clearance Date.

                                            (3)      The Board of Directors
shall recommend approval thereof by the Borrower's shareholders. The
Borrower shall mail and distribute its proxy materials for the Special
Meeting to its shareholders at least 30 days prior to the date of the
Special Meeting and shall actively solicit proxies to vote for the
Shareholder Proposal. The Borrower shall provide the Lenders an opportunity
to review and comment on such proxy materials by providing (which may be by
e-mail) copies of such proxy materials and any revised preliminary proxy
materials to the Lenders at least three (3) days prior to their filing with
the Commission. The Borrower shall provide the Lenders (which may be by
e-mail) copies of all

                                     11

<PAGE>
<PAGE>

correspondence from or to the Commission or its staff concerning the proxy
materials for the Special Meeting promptly after the same is sent or
received by the Borrower and summaries of any comments of the Commission's
staff which the Borrower receives orally promptly after receiving such oral
comments. The Borrower shall (i) furnish to the Lenders and their counsel
(which may be by e-mail) a copy of its definitive proxy materials for the
Special Meeting and any amendments or supplements thereto promptly after the
same are first used, mailed to shareholders or filed with the Commission,
(ii) inform the Lenders of the progress of solicitation of proxies for such
meeting and (iii) inform the Lenders of any adjournment of the Special
Meeting and shall report the result of the vote of shareholders on the
Shareholder Proposal at the conclusion of the Special Meeting.

                                            (4)      If for any reason the
Shareholder Proposal is not approved at the Special Meeting, the Borrower
will take such additional acts or actions as are necessary to hold an
additional Special Meeting to consider the Shareholder Proposal and in
conjunction therewith shall hire a nationally recognized proxy solicitation
firm, selected by the Lenders which is reasonably satisfactory to the
Borrower, to assist it in obtaining the necessary shareholder votes to
approve the Shareholder Proposal. The Borrower shall bear all costs and
expenses of the preparation and filing of any and all proxy materials and
Special Meetings, including but not limited to the costs and expenses of the
proxy solicitation firm if needed.

                  6.       Mechanics of Conversion.
                           -----------------------

                           (a)     The number of Underlying Shares issuable
upon any conversion hereunder shall equal the outstanding principal amount
of this Note to be converted, divided by the Conversion Price on the
Conversion Date, plus (if indicated by Borrower as set forth in Section 5)
the amount of any accrued but unpaid interest on this Note through the
Conversion Date, divided by the Conversion Price on the Conversion Date.

                           (b)     The Borrower shall promptly following
each Conversion Date (but in no event later than three Trading Days after
such Conversion Date) issue or cause to be issued and cause to be delivered
to or upon the written order of the Lender and in such name or names as the
Lender may designate a certificate for the Underlying Shares issuable upon
such conversion, free of restrictive legends. The Lender, or any Person so
designated by the Lender to receive Underlying Shares, shall be deemed to
have become holder of record of such Underlying Shares as of such Conversion
Date. The Borrower shall, upon request of the Lender, use its best efforts
to deliver Underlying Shares hereunder electronically (via a DWAC) through
the Depository Trust Corporation or another established clearing corporation
performing similar functions.

                           (c)     The Lender shall not be required to
deliver the original Note in order to effect a conversion hereunder.
Execution and delivery of the Conversion Notice shall have the same effect
as cancellation of the Note and issuance of a New Note representing the
remaining outstanding principal amount.

                           (d)     The Borrower's obligations to issue and
deliver Underlying Shares upon conversion of this Note in accordance with
the terms hereof are absolute and unconditional,

                                     12

<PAGE>
<PAGE>

irrespective of any action or inaction by the Lender to enforce the same,
any waiver or consent with respect to any provision hereof, the recovery of
any judgment against any Person or any action to enforce the same, or any
setoff, counterclaim, recoupment, limitation or termination, or any breach
or alleged breach by the Lender or any other Person of any obligation to the
Borrower or any violation or alleged violation of law by the Lender or any
other Person, and irrespective of any other circumstance which might
otherwise limit such obligation of the Borrower to the Lender in connection
with the issuance of such Underlying Shares.

                           (e)     If by the third Trading Day after a
Conversion Date or the Borrower Conversion Date the Borrower fails to
deliver to the Lender such Underlying Shares in such amounts and in the
manner required pursuant to Section 5, then the Lender will have the right
to rescind the Conversion Notice or the Borrower Conversion Notice
pertaining thereto by giving written notice to the Borrower prior to such
Lender's receipt of such Underlying Shares.

                           (f)     If by the third Trading Day after a
Conversion Date or the Borrower Conversion Date the Borrower fails to
deliver to the Lender the required number of Underlying Shares in the manner
required pursuant to Section 5, and if after such third Trading Day and
prior to the receipt of such Underlying Shares, the Lender purchases (in an
open market transaction or otherwise) shares of Common Stock to deliver in
satisfaction of a sale by the Lender of the Underlying Shares which the
Lender anticipated receiving upon such conversion (a "BUY IN"), then the
Borrower shall: (1) pay in cash to the Lender (in addition to any other
remedies available to or elected by the Lender) the amount by which (x) the
Lender's total purchase price (including brokerage commissions, if any) for
the shares of Common Stock so purchased exceeds (y) the amount obtained by
multiplying (A) the number of Underlying Shares that the Borrower was
required to deliver to the Lender in connection with the exercise at issue
by (B) the Closing Price at the time of the obligation giving rise to such
purchase obligation and (2) at the option of the Lender, either void the
conversion at issue and reinstate the principal amount of Notes (plus
converted accrued interest therein) for which such conversion was not timely
honored or deliver to the Lender the number of shares of Common Stock that
would have been issued had the Borrower timely complied with its exercise
and delivery obligations hereunder. The Lender shall provide the Borrower
reasonably detailed evidence or written notice indicating the amounts
payable to the Lender in respect of the Buy-In.

                  7.       Events of Default.
                           -----------------

                           (a)     At any time or times following the
occurrence and during the continuance of an Event of Default (other than
under clause (ix) of such defined term with respect to the Borrower), the
Lender may by notice to the Borrower (an "EVENT NOTICE"), require the
Borrower to purchase all or any portion of the outstanding principal amount
of this Note, as indicated in such Event Notice, at a purchase price in
Dollars in cash equal to the greater of: (A) 100% of such outstanding
principal amount, plus all accrued but unpaid interest thereon and any
unpaid liquidated damages and other amounts then owing to the Lender under
the Transaction Documents, through the date of purchase, or (B) the Event
Equity Value of the Underlying Shares that would be issuable upon conversion
of such principal amount and payment in Common Stock of all such accrued but
unpaid interest thereon (without regard to any condition precedent or
conversion limitation contained herein). The aggregate amount payable
pursuant to the preceding sentence is referred to as the "EVENT PRICE." The
Borrower shall pay the aggregate

                                     13

<PAGE>
<PAGE>

Event Price to the Lender (free of any claim of subordination) no later than
the third Trading Day following the date of delivery of the Event Notice,
and upon receipt thereof the Lender shall deliver the original Note so
repurchased to the Borrower.

                           (b)     Upon the occurrence of any Bankruptcy Event
with respect to the Borrower, all outstanding principal and accrued but
unpaid interest on this Note and any unpaid liquidated damages and other
amounts then owing under the Transaction Documents shall immediately become
due and payable in full in Dollars in cash (free of any claim of
subordination), without any action by the Lender, and the Borrower shall
immediately be obligated to repurchase this Note held by such Lender at the
Event Price pursuant to the preceding paragraph as if the Lender had
delivered an Event Notice immediately prior to the occurrence of such
Bankruptcy Event.

                           (c)     In connection with any Event of Default,
the Lender need not provide and the Borrower hereby waives any presentment,
demand, protest or other notice of any kind (other than the Event Notice),
and the Lender may immediately enforce any and all of its rights and
remedies hereunder and all other remedies available to it under applicable
law. Any such declaration may be rescinded and annulled by the Lender at any
time prior to payment hereunder. No such rescission or annulment shall
affect any subsequent Event of Default or impair any right consequent
thereto.

                  8.       Ranking. This Note ranks senior to or pari passu
                           -------
with all other Notes now or hereafter issued pursuant to the Transaction
Documents and is senior to or pari passu with all existing and hereafter
created Indebtedness of the Borrower. No Indebtedness of the Borrower is
senior to this Note in right of payment, whether with respect of interest,
damages or upon liquidation or dissolution or otherwise. The Borrower will
not, directly or indirectly, enter into, create, incur, assume or suffer to
exist any indebtedness of any kind, on or with respect to any of its
property or assets now owned or hereafter acquired or any interest therein
or any income or profits therefrom, that is senior in any respect to the
Borrower's obligations under the Notes.

                  9.       Charges, Taxes and Expenses. Issuance of
                           ---------------------------
certificates for Underlying Shares upon conversion of (or otherwise in
respect of) this Note shall be made without charge to the Lender for any
issue or transfer tax, withholding tax, transfer agent fee or other
incidental tax or expense in respect of the issuance of such certificate,
all of which taxes and expenses shall be paid by the Borrower; provided,
however, that the Borrower shall not be required to pay any tax which may be
payable in respect of any transfer involved in the registration of any
certificates for Underlying Shares or Notes in a name other than that of the
Lender. The Lender shall be responsible for all other tax liability that may
arise as a result of holding or transferring this Note or receiving
Underlying Shares in respect hereof.

                  10.      Reservation of Underlying Shares. The Borrower
                           --------------------------------
covenants that it will at all times reserve and keep available out of the
aggregate of its authorized but unissued and otherwise unreserved Common
Stock, solely for the purpose of enabling it to issue Underlying Shares as
required hereunder, the number of Underlying Shares which are then issuable
and deliverable upon the conversion of (and otherwise in respect of) this
entire Note (taking into account the adjustments of Section 11), free from
preemptive rights or any other contingent purchase rights of persons other
than the Lender. The Borrower covenants that all Underlying

                                     14

<PAGE>
<PAGE>

Shares so issuable and deliverable shall, upon issuance in accordance with
the terms hereof, be duly and validly authorized, issued and fully paid and
nonassessable.

                  11.      Certain Adjustments. The Conversion Price is subject
                           -------------------
to adjustment from time to time as set forth in this Section 11.

                           (a)     Stock Dividends and Splits. If the Borrower,
                                   --------------------------
at any time while this Note is outstanding: (i) pays a stock dividend on its
Common Stock or otherwise makes a distribution on any class of capital stock
that is payable in shares of Common Stock, (ii) subdivides outstanding
shares of Common Stock into a larger number of shares, or (iii) combines
outstanding shares of Common Stock into a smaller number of shares, then in
each such case the Conversion Price shall be multiplied by a fraction of
which the numerator shall be the number of shares of Common Stock
outstanding immediately before such event and of which the denominator shall
be the number of shares of Common Stock outstanding immediately after such
event. Any adjustment made pursuant to clause (i) of this paragraph shall
become effective immediately after the record date for the determination of
shareholders entitled to receive such dividend or distribution, and any
adjustment pursuant to clause (ii) or (iii) of this paragraph shall become
effective immediately after the effective date of such subdivision or
combination.

                           (b)     Pro Rata Distributions. If the Borrower,
                                   ----------------------
at any time while this Note is outstanding, distributes to all holders of
Common Stock (i) evidences of its indebtedness, (ii) any security (other
than a distribution of Common Stock covered by the preceding paragraph),
(iii) rights or warrants to subscribe for or purchase any security, or (iv)
any other asset (in each case, "DISTRIBUTED PROPERTY"), then, at the request
of the Lender delivered before the 90th day after the record date fixed for
determination of shareholders entitled to receive such distribution, the
Borrower will deliver to the Lender, within five Trading Days after such
request (or, if later, on the effective date of such distribution), the
Distributed Property that the Lender would have been entitled to receive in
respect of the Underlying Shares for which this Note could have been
converted immediately prior to such record date. If such Distributed
Property is not delivered to the Lender pursuant to the preceding sentence,
then upon any conversion of this Note that occurs after such record date,
the Lender shall be entitled to receive, in addition to the Underlying
Shares otherwise issuable upon such conversion, the Distributed Property
that the Lender would have been entitled to receive in respect of such
number of Underlying Shares had the Lender been the record holder of such
Underlying Shares immediately prior to such record date. Notwithstanding the
foregoing, this Section 11(b) shall not apply to any distribution of rights
or securities in respect of adoption by the Borrower of a shareholder rights
plan, which events shall be covered by Section 11(a).

                           (c)     Fundamental Transactions. If, at any time
                                   ------------------------
while this Note is outstanding, (i) the Borrower effects any merger or
consolidation of the Borrower with or into another Person, (ii) the Borrower
effects any sale of all or substantially all of its assets in one or a
series of related transactions, (iii) any tender offer or exchange offer
(whether by the Borrower or another Person) is completed pursuant to which
holders of Common Stock tender or exchange their shares for other
securities, cash or property, or (iv) the Borrower effects any
reclassification of the Common Stock or any compulsory share exchange
pursuant to which the Common Stock is effectively converted into or
exchanged for other securities, cash or property (other than as a result of
a subdivision or combination of shares of Common Stock covered by Section 11(a)

                                     15

<PAGE>
<PAGE>

above) (in any such case, a "FUNDAMENTAL TRANSACTION"), then upon any
subsequent conversion of this Note, the Lender shall have the right to: (x)
declare an Event of Default pursuant to clause (iii) thereunder, (y)
receive, for each Underlying Share that would have been issuable upon such
conversion absent such Fundamental Transaction, the same kind and amount of
securities, cash or property as it would have been entitled to receive upon
the occurrence of such Fundamental Transaction if it had been, immediately
prior to such Fundamental Transaction, the holder of one share of Common
Stock (the "ALTERNATE CONSIDERATION") or (z) require the surviving entity to
issue to the Lender and instrument identical to this Note (with an
appropriate adjustments to the conversion price). For purposes of any such
conversion, the Borrower shall apportion the Conversion Price among the
Alternate Consideration in a reasonable manner reflecting the relative value
of any different components of the Alternate Consideration. If holders of
Common Stock are given any choice as to the securities, cash or property to
be received in a Fundamental Transaction, then the Lender shall be given the
same choice as to the Alternate Consideration it receives upon any
conversion of this Note following such Fundamental Transaction. To the
extent necessary to effectuate the foregoing provisions, any successor to
the Borrower or surviving entity in such Fundamental Transaction (or, if
different, the ultimate parent of such successor or entity or the entity
issuing the Alternate Consideration) shall issue to the Lender a new
debenture consistent with the foregoing provisions and evidencing the
Lender's right to convert such debenture into Alternate Consideration. The
terms of any agreement pursuant to which a Fundamental Transaction is
effected shall include terms requiring any such successor or surviving
entity to comply with the provisions of this paragraph (c) and insuring that
this Note (or any such replacement security) will be similarly adjusted upon
any subsequent transaction analogous to a Fundamental Transaction.

                           (d)     Subsequent Equity Sales.
                                   -----------------------

                                   (i)      If the Borrower or any Subsidiary,
as applicable, at any time while this Note is outstanding, shall issue
shares of Common Stock or Common Stock Equivalents entitling any Person to
acquire shares of Common Stock, at a price per share less than the
Conversion Price (if the holder of the Common Stock or Common Stock
Equivalent so issued shall at any time, whether by operation of purchase
price adjustments, reset provisions, floating conversion, exercise or
exchange prices or otherwise, or due to warrants, options or rights issued
in connection with such issuance, be entitled to receive shares of Common
Stock at a price less than the Conversion Price, such issuance shall be
deemed to have occurred for less than the Conversion Price), then, the
Conversion Price shall be adjusted to the lowest conversion, exchange or
purchase price for such Common Stock or Common Stock Equivalents (including
any reset provisions thereof) at issue. Such adjustment shall be made
whenever such Common Stock or Common Stock Equivalents are issued. The
Borrower shall notify the Lender in writing, no later than the Trading Day
following the issuance of any Common Stock or Common Stock Equivalent
subject to this section, indicating therein the applicable issuance price,
or of applicable reset price, exchange price, conversion price and other
pricing terms. No further adjustments shall be made to the Conversion Price
upon the actual issuance of Common Stock upon conversion or exercise of the
applicable Common Stock Equivalent.

                                   (ii)     For purposes of this subsection
11(d), the following subsections (d)(ii)(l) to (d)(ii)(6) shall also be
applicable:

                                     16

<PAGE>
<PAGE>

                                            (1)      Issuance of Rights or
                                                     ---------------------
Options. In case at any time the Borrower shall in any manner grant
-------
(directly and not by assumption in a merger or otherwise) any warrants or
other rights to subscribe for or to purchase, or any options for the
purchase of, Common Stock or any stock or security convertible into or
exchangeable for Common Stock (such warrants, rights or options being called
"OPTIONS" and such convertible or exchangeable stock or securities being
called "CONVERTIBLE SECURITIES") whether or not such Options or the right to
convert or exchange any such Convertible Securities are immediately
exercisable, and the price per share for which Common Stock is issuable upon
the exercise of such Options or upon the conversion or exchange of such
Convertible Securities (determined by dividing (i) the sum (which sum shall
constitute the applicable consideration) of (x) the total amount, if any,
received or receivable by the Borrower as consideration for the granting of
such Options, plus (y) the aggregate amount of additional consideration
payable to the Borrower upon the exercise of all such Options, plus (z), in
the case of such Options which relate to Convertible Securities, the
aggregate amount of additional consideration, if any, payable upon the issue
or sale of such Convertible Securities and upon the conversion or exchange
thereof, by (ii) the total maximum number of shares of Common Stock issuable
upon the exercise of such Options or upon the conversion or exchange of all
such Convertible Securities issuable upon the exercise of such Options)
shall be less than the Conversion Price in effect immediately prior to the
time of the granting of such Options, then the total number of shares of
Common Stock issuable upon the exercise of such Options or upon conversion
or exchange of the total amount of such Convertible Securities issuable upon
the exercise of such Options shall be deemed to have been issued for such
price per share as of the date of granting of such Options or the issuance
of such Convertible Securities and thereafter shall be deemed to be
outstanding for purposes of adjusting the Conversion Price. Except as
otherwise provided in subsection 11(d)(ii)(3), no adjustment of the
Conversion Price shall be made upon the actual issue of such Common Stock or
of such Convertible Securities upon exercise of such Options or upon the
actual issue of such Common Stock upon conversion or exchange of such
Convertible Securities.

                                            (2)      Issuance of Convertible
                                                     -----------------------
Securities. In case the Borrower shall in any manner issue (directly and not
----------
by assumption in a merger or otherwise) or sell any Convertible Securities,
whether or not the rights to exchange or convert any such Convertible
Securities are immediately exercisable, and the price per share for which
Common Stock is issuable upon such conversion or exchange (determined by
dividing (i) the sum (which sum shall constitute the applicable
consideration) of (x) the total amount received or receivable by the
Borrower as consideration for the issue or sale of such Convertible
Securities, plus (y) the aggregate amount of additional consideration, if
any, payable to the Borrower upon the conversion or exchange thereof, by
(ii) the total number of shares of Common Stock issuable upon the conversion
or exchange of all such Convertible Securities) shall be less than the
Conversion Price in effect immediately prior to the time of such issue or
sale, then the total maximum number of shares of Common Stock issuable upon
conversion or exchange of all such Convertible Securities shall be deemed to
have been issued for such price per share as of the date of the issue or
sale of such Convertible Securities and thereafter shall be deemed to be
outstanding for purposes of adjusting the Conversion Price, provided that
(a) except as otherwise provided in subsection 11(d)(ii)(3), no adjustment
of the Conversion Price shall be made upon the actual issuance of such
Common Stock upon conversion or exchange of such Convertible Securities and
(b) no further adjustment of the Conversion Price shall be made by reason of
the issue or sale of Convertible Securities upon exercise of any Options to
purchase any such

                                     17

<PAGE>
<PAGE>

Convertible Securities for which adjustments of the Conversion Price have
been made pursuant to the other provisions of subsection 11(d).

                                            (3)      Change in Option Price
                                                     ----------------------
or Conversion Rate. Upon the happening of any of the following events,
------------------
namely, if the purchase price provided for in any Option referred to in
subsection 11(d)(ii)(l) hereof, the additional consideration, if any,
payable upon the conversion or exchange of any Convertible Securities
referred to in subsections 11(d)(ii)(l) or 11(d)(ii)(2), or the rate at
which Convertible Securities referred to in subsections 11(d)(ii)(l) or
11(d)(ii)(2) are convertible into or exchangeable for Common Stock shall
change at any time (including, but not limited to, changes under or by
reason of provisions designed to protect against dilution), the Conversion
Price in effect at the time of such event shall forthwith be readjusted to
the Conversion Price which would have been in effect at such time had such
Options or Convertible Securities still outstanding provided for such
changed purchase price, additional consideration or conversion rate, as the
case may be, at the time initially granted, issued or sold. On the
termination of any Option for which any adjustment was made pursuant to this
subsection 11(d) or any right to convert or exchange Convertible Securities
for which any adjustment was made pursuant to this subsection 11(d)
(including without limitation upon the redemption or purchase for
consideration of such Convertible Securities by the Borrower), the
Conversion Price then in effect hereunder shall forthwith be changed to the
Conversion Price which would have been in effect at the time of such
termination had such Option or Convertible Securities, to the extent
outstanding immediately prior to such termination, never been issued.

                                            (4)      Stock Dividends. Subject
                                                     ---------------
to the provisions of this Section 11(d), in case the Borrower shall declare
a dividend or make any other distribution upon any stock of the Borrower
(other than the Common Stock) payable in Common Stock, Options or
Convertible Securities, then any Common Stock, Options or Convertible
Securities, as the case may be, issuable in payment of such dividend or
distribution shall be deemed to have been issued or sold without
consideration.

                                            (5)      Consideration for Stock.
                                                     -----------------------
In case any shares of Common Stock, Options or Convertible Securities shall
be issued or sold for cash, the consideration received therefor shall be
deemed to be the net amount received by the Borrower therefor, after
deduction therefrom of any expenses incurred or any underwriting commissions
or concessions paid or allowed by the Borrower in connection therewith. In
case any shares of Common Stock, Options or Convertible Securities shall be
issued or sold for a consideration other than cash, the amount of the
consideration other than cash received by the Borrower shall be deemed to be
the fair value of such consideration as determined in good faith by the
Board of Directors of the Borrower, after deduction of any expenses incurred
or any underwriting commissions or concessions paid or allowed by the
Borrower in connection therewith. In case any Options shall be issued in
connection with the issue and sale of other securities of the Borrower,
together comprising one integral transaction in which no specific
consideration is allocated to such Options by the parties thereto, such
Options shall be deemed to have been issued for such consideration as
determined in good faith by the Board of Directors of the Borrower. If
Common Stock, Options or Convertible Securities shall be issued or sold by
the Borrower and, in connection therewith, other Options or Convertible
Securities (the "ADDITIONAL RIGHTS") are issued, then the consideration
received or deemed to be received by the Borrower shall be reduced by the
fair market value of the Additional Rights (as determined using the

                                     18

<PAGE>
<PAGE>

Black-Scholes option pricing model or another method mutually agreed to by
the Borrower and the Lender). The Board of Directors of the Borrower shall
respond promptly, in writing, to an inquiry by the Lenders as to the fair
market value of the Additional Rights. In the event that the Board of
Directors of the Borrower and the Lenders are unable to agree upon the fair
market value of the Additional Rights, the Borrower and the Lenders shall
jointly select an appraiser, who is experienced in such matters. The
decision of such appraiser shall be final and conclusive, and the cost of
such appraiser shall be borne evenly by the Borrower and the Lender.

                                            (6)      Record Date. In case the
                                                     -----------
Borrower shall take a record of the holders of its Common Stock for the
purpose of entitling them (i) to receive a dividend or other distribution
payable in Common Stock, Options or Convertible Securities or (ii) to
subscribe for or purchase Common Stock, Options or Convertible Securities,
then such record date shall be deemed to be the date of the issue or sale of
the shares of Common Stock deemed to have been issued or sold upon the
declaration of such dividend or the making of such other distribution or the
date of the granting of such right of subscription or purchase, as the case
may be.

                                   (iii)    Notwithstanding the foregoing,

no adjustment will be made under this paragraph (d) in respect of: (A) the
issuance of securities upon the exercise or conversion of any Common Stock
Equivalents issued by the Borrower prior to the Original Issue Date of this
Note (but will apply to any amendments, modifications and reissuances
thereof), and (B) the grant of options or warrants, or the issuance of
additional securities, under any duly authorized Borrower stock option,
stock incentive plan, restricted stock plan or stock purchase plan in
existence on the Closing Date; (C) the issuance of Common Stock in payment
of interest on the 2005 Notes, 2004 Notes or on the 2003 Debentures or 2004
Debentures or this Note; (D) the issuance of Common Stock Equivalents
pursuant to a Strategic Transaction or (E) the issuance of Common Stock
pursuant to Section 2(c) of the Registration Rights Agreement.

                           (e)     Reclassifications; Share Exchanges. In
                                   ----------------------------------
case of any reclassification of the Common Stock, or any compulsory share
exchange pursuant to which the Common Stock is converted into other
securities, cash or property (other than compulsory share exchanges which
constitute Change of Control transactions), the Lenders of the Notes then
outstanding shall have the right thereafter to convert such shares only into
the shares of stock and other securities, cash and property receivable upon
or deemed to be held by holders of Common Stock following such
reclassification or share exchange, and the Lenders shall be entitled upon
such event to receive such amount of securities, cash or property as a
holder of the number of shares of Common Stock of the Borrower into which
such shares of Notes could have been converted immediately prior to such
reclassification or share exchange would have been entitled. This provision
shall similarly apply to successive reclassifications or share exchanges.

                           (f)     Calculations. All calculations under
                                   ------------
this Section 11 shall be made to the nearest cent or the nearest 1/100th of
a share, as applicable. The number of shares of Common Stock outstanding at
any given time shall not include shares owned or held by or for the account
of the Borrower, and the disposition of any such shares shall be considered
an issue or sale of Common Stock.

                                     19

<PAGE>
<PAGE>

                           (g)     Notice of Adjustments. Upon the occurrence
                                   ---------------------
of each adjustment pursuant to this Section 11, the Borrower at its expense
will promptly compute such adjustment in accordance with the terms hereof
and prepare a certificate describing in reasonable detail such adjustment
and the transactions giving rise thereto, including all facts upon which
such adjustment is based. Upon written request, the Borrower will promptly
deliver a copy of each such certificate to the Lender.

                           (h)     Notice of Corporate Events. If the Borrower
                                   --------------------------
(i) declares a dividend or any other distribution of cash, securities or
other property in respect of its Common Stock, including without limitation
any granting of rights or warrants to subscribe for or purchase any capital
stock of the Borrower or any Subsidiary, (ii) authorizes and publicly
approves, or enters into any agreement contemplating or solicits shareholder
approval for any Fundamental Transaction or (iii) publicly authorizes the
voluntary dissolution, liquidation or winding up of the affairs of the
Borrower, then the Borrower shall deliver to the Lender a notice describing
the material terms and conditions of such transaction, at least 20 calendar
days prior to the applicable record or effective date on which a Person
would need to hold Common Stock in order to participate in or vote with
respect to such transaction, and the Borrower will take all steps reasonably
necessary in order to insure that the Lender is given the practical
opportunity to convert this Note prior to such time so as to participate in
or vote with respect to such transaction; provided, however, that the
failure to deliver such notice or any defect therein shall not affect the
validity of the corporate action required to be described in such notice.

                  12.      Fractional Shares. The Borrower shall not be required
                           -----------------
to issue or cause to be issued fractional Underlying Shares on conversion of
this Note. If any fraction of an Underlying Share would, except for the
provisions of this Section, be issuable upon conversion of this Note or
payment of interest hereon, the number of Underlying Shares to be issued
will be rounded up to the nearest whole share.

                  13.      Call Right.
                           ----------

                           (a)     Subject to the provisions of this
Section 13, if after the six-month anniversary of the Effective Date, the
----------
Closing Price of the Borrower's Common Stock on the Nasdaq National Market
is equal to or above $25.00(6) (as adjusted pursuant to Section 11) (the
"THRESHOLD PRICE") for each of 20 consecutive Trading Days, then the
Borrower shall have the right, but not the obligation (the "CALL RIGHT"), on
at least thirty (30) days prior written notice to the Lender to redeem all
(but not part) of the unpaid principal balance of this Note for which a
Conversion Notice has not yet been delivered (the "CALL AMOUNT").

                           (b)     To exercise this Call Right, the Borrower
shall deliver to the Lender an irrevocable written notice (a "CALL NOTICE"),
indicating the Call Amount. The date that the Borrower delivers the Call
Notice to the Lender shall be referred to as the "CALL DATE." Within thirty
(30) days of receipt of the Call Notice, and provided that the Lender is
permitted to convert this Note pursuant to Section 5 above, the Lender may
convert this Note in whole or in part in accordance with Section 5 above.
Any portion of the Call Amount that is not exercised

<FN>
--------------------
(6) For the Third and Fourth Closing, the required Closing Price of the
    Common Stock would be adjusted to twice the Third Closing Purchase
    Price and Fourth Closing Purchase Price, respectively.

                                     20

<PAGE>
<PAGE>

by 6:30 p.m. (New York City time) on the 30th day following the date of
receipt of the Call Notice (the "REDEMPTION DATE") shall be cancelled upon
the payment by the Borrower to the Lender of the Call Amount, plus all
accrued but unpaid interest thereon through the date of payment. Any portion
of this Note to which the Call Notice does not pertain (the "REMAINING
PORTION") will be unaffected by such Call Notice. The Borrower covenants and
agrees that it will honor any Conversion Notice with respect to the Call
Amount that is tendered to the Borrower from the time of delivery of the
Call Notice through and including 6:30 p.m. (New York City time) on the
Redemption Date.

                           (c)     Notwithstanding anything to the contrary
set forth in this Note, the Borrower may not deliver a Call Notice or
require the cancellation of any unexercised Call Amount (and any Call Notice
will be void), unless from the beginning of the 20 consecutive Trading Days
used to determine whether the Common Stock has achieved the Threshold Price
through the Redemption Date (the "CALL PERIOD") (i) the Borrower shall have
honored in accordance with the terms of this Note any Conversion Notice
delivered by 6:30 p.m. (New York City time) on or prior to the Redemption
Date, (ii) all Equity Conditions Are Satisfied, and (iii) the Closing Price
of the Borrower's Common Stock is equal to or above the Threshold Price.

                  14.      Notices. Any and all notices or other communications
                           -------
or deliveries hereunder (including without limitation any Conversion Notice
or the Borrower Conversion Notice) shall be in writing and shall be deemed
given and effective on the earliest of (i) the date of transmission, if such
notice or communication is delivered via facsimile at the facsimile number
specified in this Section prior to 6:30 p.m. (New York City time) on a
Trading Day, (ii) the next Trading Day after the date of transmission, if
such notice or communication is delivered via facsimile at the facsimile
number specified in this Section on a day that is not a Trading Day or later
than 6:30 p.m. (New York City time) on any Trading Day, (iii) the Trading
Day following the date of mailing, if sent by nationally recognized
overnight courier service, or (iv) upon actual receipt by the party to whom
such notice is required to be given. The addresses for such communications
shall be: (i) if to the Borrower, to 3101 McKelvey Road, St. Louis, Missouri
63044, facsimile: (314) 291-9082, attention Chief Financial Officer, (ii) if
to the Lender, to the address or facsimile number appearing on the
Borrower's shareholder records or such other address or facsimile number as
the Lender may provide to the Borrower in accordance with this Section, or
(iii) if to the Administrative Agent, to the address or facsimile number
therefor set forth in the Loan Agreement.

                  15.      Miscellaneous.
                           -------------

                           (a)     This Note shall be binding on and inure to
the benefit of the parties hereto and their respective successors and
assigns.

                           (b)     Subject to Section 15(a), above, nothing
in this Note shall be construed to give to any person or corporation other
than the Borrower and the Lender any legal or equitable right, remedy or
cause under this Note. This Note shall inure to the sole and exclusive
benefit of the Borrower and the Lender.

                           (c)     All questions concerning the construction,
validity, enforcement and interpretation of this Note shall be governed by
and construed and enforced in accordance

                                     21

<PAGE>
<PAGE>

with the internal laws of the State of New York, without regard to the
principles of conflicts of law thereof. Each party agrees that all
Proceedings shall be commenced exclusively in the state and federal courts
sitting in the City of New York, Borough of Manhattan (the "NEW YORK
COURTS"). Each party hereto hereby irrevocably submits to the exclusive
jurisdiction of the New York Courts for any Proceeding, and hereby
irrevocably waives, and agrees not to assert in any proceeding, any claim
that it is not personally subject to the jurisdiction of any New York Court
or that a New York Court is an inconvenient forum for such Proceeding. Each
party hereto hereby irrevocably waives personal service of process and
consents to process being served in any such Proceeding by mailing a copy
thereof via registered or certified mail or overnight delivery (with
evidence of delivery) to such party at the address in effect for notices to
it under this Note and agrees that such service shall constitute good and
sufficient service of process and notice thereof. Nothing contained herein
shall be deemed to limit in any way any right to serve process in any manner
permitted by law. Each party hereto hereby irrevocably waives, to the
fullest extent permitted by applicable law, any and all right to trial by
jury in any legal proceeding. The prevailing party in a proceeding shall be
reimbursed by the other party for its reasonable attorneys' fees and other
costs and expenses incurred with the investigation, preparation and
prosecution of such proceeding.

                           (d)     The headings herein are for convenience
only, do not constitute a part of this Note and shall not be deemed to limit
or affect any of the provisions hereof.

                           (e)     In case any one or more of the provisions
of this Note shall be invalid or unenforceable in any respect, the validity
and enforceability of the remaining terms and provisions of this Note shall
not in any way be affected or impaired thereby and the parties will attempt
in good faith to agree upon a valid and enforceable provision which shall be
a commercially reasonable substitute therefor, and upon so agreeing, shall
incorporate such substitute provision in this Note.

                           (f)     No provision of this Note may be waived,
amended or otherwise modified except in accordance with the requirements set
forth in the Loan Agreement. No waiver of any default with respect to any
provision, condition or requirement of this Note shall be deemed to be a
continuing waiver in the future or a waiver of any subsequent default or a
waiver of any other provision, condition or requirement hereof, nor shall
any delay or omission of either party to exercise any right hereunder in any
manner impair the exercise of any such right.

                           (g)     To the extent it may lawfully do so, the
Borrower hereby agrees not to insist upon or plead or in any manner
whatsoever claim, and will resist any and all efforts to be compelled to
take the benefit or advantage of, usury laws wherever enacted, now or at any
time hereafter in force, in connection with any claim, action or proceeding
that may be brought by any Lender in order to enforce any right or remedy
under the Notes. Notwithstanding any provision to the contrary contained in
the Notes, it is expressly agreed and provided that the total liability of
the Borrower under the Notes for payments in the nature of interest shall
not exceed the maximum lawful rate authorized under applicable law (the
"MAXIMUM RATE"), and, without limiting the foregoing, in no event shall any
rate of interest or default interest, or both of them, when aggregated with
any other sums in the nature of interest that the Borrower may be obligated
to pay under the Notes exceed such Maximum Rate. It is agreed that if the
maximum contract rate of interest allowed by law and applicable to the Notes
is increased or decreased by

                                     22

<PAGE>
<PAGE>

statute or any official governmental action subsequent to the date hereof,
the new maximum contract rate of interest allowed by law will be the Maximum
Rate of interest applicable to the Notes from the effective date forward,
unless such application is precluded by applicable law. If under any
circumstances whatsoever, interest in excess of the Maximum Rate is paid by
the Borrower to any Lender with respect to indebtedness evidenced by the
Notes, such excess shall be applied by such Lender to the unpaid principal
balance of any such indebtedness or be refunded to the Borrower, the manner
of handling such excess to be at such Lender's election.

                          [Signature Page Follows]

                                     23

<PAGE>
<PAGE>

         IN WITNESS WHEREOF, the Borrower has caused this Note to be duly
executed by a duly authorized officer as of the date first above indicated.

                                   ZOLTEK COMPANIES, INC.

                                   By:
                                       ------------------------------------
                                       Name:
                                       Title:

                                     24

<PAGE>
<PAGE>

                                  EXHIBIT A

                              CONVERSION NOTICE

(To be Executed by the Registered Lender
in order to convert Notes)

         The undersigned hereby elects to convert the principal amount of
Note indicated below, into shares of Common Stock of Zoltek Companies, Inc.,
as of the date written below. If shares are to be issued in the name of a
Person other than undersigned, the undersigned will pay all transfer taxes
payable with respect thereto and is delivering herewith such certificates
and opinions as reasonably requested by the Borrower in accordance
therewith. No fee will be charged to the Lender for any conversion, except
for such transfer taxes, if any. All terms used in this notice shall have
the meanings set forth in the Note.

Conversion calculations:
                          ----------------------------------------------------
                          Date to Effect Conversion

                          ----------------------------------------------------
                          Principal amount of Note owned prior to conversion

                          ----------------------------------------------------
                          Principal amount of Note to be Converted

                          ----------------------------------------------------
                          Principal amount of Note remaining after Conversion

                          ----------------------------------------------------
                          Number of shares of Common Stock to be Issued

                          ----------------------------------------------------
                          Applicable Conversion Price

                          ----------------------------------------------------
                          Name of Lender

                          By:
                              ------------------------------------------------
                              Name:
                              Title:

         By the delivery of this Conversion Notice the Lender represents and
warrants to the Borrower that its ownership of the Common Stock does not
exceed the restrictions set forth in Section 5(b) of the Note.

                                     25

<PAGE>
<PAGE>

                                 SCHEDULE 1

                           Zoltek Companies, Inc.
                      Senior Convertible Notes due [ ]

                             CONVERSION SCHEDULE

               This Conversion Schedule reflects conversions made under the
above referenced Notes.

                                   Dated:

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------
      Date of Conversion           Amount of Conversion           Aggregate        Applicable Conversion Price
                                                                  Principal
                                                                   Amount
                                                                  Remaining
                                                                Subsequent to
                                                                 Conversion
---------------------------------------------------------------------------------------------------------------
<S>                                <C>                          <C>                <C>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

---------------------------------------------------------------------------------------------------------------
</TABLE>

                                     26<PAGE>

                                                                 Exhibit 4.3

                                                           Execution Version

                                  EXHIBIT C
                                  ---------

NEITHER THESE SECURITIES NOR THE SECURITIES INTO WHICH THESE SECURITIES ARE
EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION
OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM
REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN
AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND IN ACCORDANCE WITH
APPLICABLE STATE SECURITIES LAWS AS EVIDENCED BY A LEGAL OPINION OF COUNSEL
TO THE TRANSFEROR TO SUCH EFFECT, THE SUBSTANCE OF WHICH SHALL BE REASONABLY
ACCEPTABLE TO THE COMPANY. THESE SECURITIES AND THE SECURITIES ISSUABLE UPON
EXERCISE OF THESE SECURITIES MAY BE PLEDGED IN A MANNER CONSISTENT WITH THE
SECURITIES ACT IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT SECURED BY SUCH
SECURITIES.

                         ZOLTEK COMPANIES, INC.(1)

                                   WARRANT

Warrant No. [ ]                      Date of Original Issuance: [   ], 200_

         Zoltek Companies, Inc., a Missouri corporation (the "COMPANY"),
hereby certifies that, for value received, [ ] or its registered assigns
(the "HOLDER"), is entitled to purchase from the Company up to a total of
[ ](2) shares of common stock, par value $0.01 per share (the "COMMON STOCK"),
of the Company (each such share, a "WARRANT SHARE" and all such shares, the
"WARRANT SHARES") at an exercise price equal to $14.50(3) per share (as
adjusted from time to time as provided in Section 9, the "EXERCISE PRICE"),
at any time and from time to time from and

<FN>
---------
(1) This form of warrant will be used for the Warrants issued in connection
    with each of the First Closing, Second Closing, Third Closing and Fourth
    Closing.

(2) 35% warrant coverage based on the amount of the Holder's First Closing
    Purchase Price, the Second Closing Purchase Price, the Third Closing
    Purchase Price or Fourth Closing Purchase Price, as applicable, divided by
    the applicable Exercise Price.

(3) The Exercise Price for the Third Closing and Fourth Closing shall be
    equal to 116% of the Third Closing Purchase Price and the Fourth Closing
    Purchase Price, respectively.

<PAGE>
<PAGE>

after the date hereof and through and including [________ __], 20__(4) (the
"EXPIRATION DATE"), and subject to the following terms and conditions:

         1.       Definitions. In addition to the terms defined elsewhere
                  -----------
in this Warrant, capitalized terms that are not otherwise defined herein
shall have the meanings given to such terms in the Loan and Warrant
Agreement, dated as of September 29, 2005 to which the Company and the
original Holder are parties (the "PURCHASE AGREEMENT").

         2.       Registration of Warrant. The Company shall register this
                  -----------------------
Warrant, upon records to be maintained by the Company for that purpose (the
"WARRANT REGISTER"), in the name of the record Holder hereof from time to
time. The Company may deem and treat the registered Holder of this Warrant
as the absolute owner hereof for the purpose of any exercise hereof or any
distribution to the Holder, and for all other purposes, absent actual notice
to the contrary.

         3.       Registration of Transfers. The Company shall register the
                  -------------------------
transfer of any portion of this Warrant in the Warrant Register, upon
surrender of this Warrant, with the Form of Assignment attached hereto duly
completed and signed, to the Company at its address specified herein. Upon
any such registration or transfer, a new Warrant to purchase Common Stock,
in substantially the form of this Warrant (any such new Warrant, a "NEW
WARRANT"), evidencing the portion of this Warrant so transferred shall be
issued to the transferee and a New Warrant evidencing the remaining portion
of this Warrant not so transferred, if any, shall be issued to the
transferring Holder. The acceptance of the New Warrant by the transferee
thereof shall be deemed the acceptance by such transferee of all of the
rights and obligations of a holder of a Warrant.

         4.       Exercise and Duration of Warrants.
                  ---------------------------------

                  (a)      This Warrant shall be exercisable by the registered
Holder at any time and from time to time on or after the date hereof to and
including the Expiration Date. At 6:30 p.m., New York City time on the
Expiration Date, the portion of this Warrant not exercised prior thereto
shall be and become void and of no value, provided, that if the closing
                                          --------
sales price of the Common Stock on the Expiration Date is greater than 102%
of the Exercise Price on the Expiration Date, then this Warrant shall be
deemed to have been exercised in full (to the extent not previously
exercised) on a "cashless exercise" basis at 6:30 P.M. New York City time on
the Expiration Date. The Company may not call or redeem all or any portion
of this Warrant without the prior written consent of the Holder.

                  (b)      Notwithstanding anything to the contrary herein, at
the option of the Holder, the Expiration Date may be extended for the number
of Trading Days during any period occurring after the Effectiveness Date in
which (i) trading in the Common Stock is suspended by any Trading Market,
(ii) the Registration Statement is not effective, or (iii) the prospectus
included in the Registration Statement may not be used by the Holders for
the resale of Registrable Securities thereunder.

<FN>
---------
(4) Each warrant shall have a 5 year term.

                                     2

<PAGE>
<PAGE>

         5.       Delivery of Warrant Shares.
                  --------------------------

                  (a)      To effect exercises hereunder, the Holder shall
not be required to physically surrender this Warrant unless the aggregate
Warrant Shares represented by this Warrant is being exercised. Upon delivery
of the Exercise Notice to the Company (with the attached Warrant Shares
Exercise Log) at its address for notice set forth herein and upon payment of
the Exercise Price multiplied by the number of Warrant Shares that the
Holder intends to purchase hereunder, the Company shall promptly (but in no
event later than three Trading Days after the Date of Exercise (as defined
herein)) issue and deliver to the Holder, a certificate for the Warrant
Shares issuable upon such exercise, which, unless otherwise required by the
Purchase Agreement, shall be free of restrictive legends. The Company shall,
upon request of the Holder and subsequent to the date on which a
registration statement covering the resale of the Warrant Shares has been
declared effective by the Securities and Exchange Commission, use its best
efforts to deliver Warrant Shares hereunder electronically through The
Depository Trust Corporation or another established clearing corporation
performing similar functions, if available, provided, that, the Company may,
but will not be required to change its transfer agent if its current
transfer agent cannot deliver Warrant Shares electronically through the
Depository Trust Corporation. A "DATE OF EXERCISE" means the date on which
the Holder shall have delivered to Company: (i) the Exercise Notice (with
the Warrant Exercise Log attached to it), appropriately completed and duly
signed and (ii) if such Holder is not utilizing the cashless exercise
provisions set forth in this Warrant, payment of the Exercise Price for the
number of Warrant Shares so indicated by the Holder to be purchased.

                  (b)      If by the third Trading Day after a Date of Exercise
the Company fails to deliver the required number of Warrant Shares in the
manner required pursuant to Section 5(a), then the Holder will have the
right to rescind such exercise.

                  (c)      If by the third Trading Day after a Date of Exercise
the Company fails to deliver the required number of Warrant Shares in the
manner required pursuant to Section 5(a), and if after such third Trading
Day and prior to the receipt of such Warrant Shares, the Holder purchases
(in an open market transaction or otherwise) shares of Common Stock to
deliver in satisfaction of a sale by the Holder of the Warrant Shares which
the Holder anticipated receiving upon such exercise (a "BUY-IN"), then the
Company shall (1) pay in cash to the Holder the amount by which (x) the
Holder's total purchase price (including brokerage commissions, if any) for
the shares of Common Stock so purchased exceeds (y) the amount obtained by
multiplying (A) the number of Warrant Shares that the Company was required
to deliver to the Holder in connection with the exercise at issue by (B) the
closing bid price of the Common Stock at the time of the obligation giving
rise to such purchase obligation and (2) at the option of the Holder, either
reinstate the portion of the Warrant and equivalent number of Warrant Shares
for which such exercise was not honored or deliver to the Holder the number
of shares of Common Stock that would have been issued had the Company timely
complied with its exercise and delivery obligations hereunder. The Holder
shall provide the Company written notice indicating the amounts payable to
the Holder in respect of the Buy-In.

                  (d)      The Company's obligations to issue and deliver
Warrant Shares in accordance with the terms hereof are absolute and
unconditional, irrespective of any action or inaction by the Holder to
enforce the same, any waiver or consent with respect to any provision
hereof, the recovery of any judgment against any Person or any action to
enforce the same, or any setoff, counterclaim, recoupment, limitation or
termination, or any breach or alleged breach by the Holder or any other
Person of any obligation to the Company or any violation or alleged

                                     3

<PAGE>
<PAGE>

violation of law by the Holder or any other Person, and irrespective of any
other circumstance which might otherwise limit such obligation of the
Company to the Holder in connection with the issuance of Warrant Shares.
Nothing herein shall limit a Holder's right to pursue any other remedies
available to it hereunder, at law or in equity including, without
limitation, a decree of specific performance and/or injunctive relief with
respect to the Company's failure to timely deliver certificates representing
shares of Common Stock upon exercise of the Warrant as required pursuant to
the terms hereof.

         6.       Charges, Taxes and Expenses. Issuance and delivery of
                  ---------------------------
certificates for shares of Common Stock upon exercise of this Warrant shall
be made without charge to the Holder for any issue or transfer tax,
withholding tax, transfer agent fee or other incidental tax or expense in
respect of the issuance of such certificates, all of which taxes and
expenses shall be paid by the Company; provided, however, that the Company
shall not be required to pay any tax which may be payable in respect of any
transfer involved in the registration of any certificates for Warrant Shares
or Warrants in a name other than that of the Holder. The Holder shall be
responsible for all other tax liability that may arise as a result of
holding or transferring this Warrant or receiving Warrant Shares upon
exercise hereof.

         7.       Replacement of Warrant. If this Warrant is mutilated, lost,
                  ----------------------
stolen or destroyed, the Company shall issue or cause to be issued in
exchange and substitution for and upon cancellation hereof, or in lieu of
and substitution for this Warrant, a New Warrant, but only upon receipt of
evidence reasonably satisfactory to the Company of such loss, theft or
destruction and customary and reasonable indemnity (which may include a
surety bond for any Holder other than the original Holder of the Warrant),
if requested. Applicants for a New Warrant under such circumstances shall
also comply with such other reasonable regulations and procedures and pay
such other reasonable third-party costs as the Company may prescribe. If a
New Warrant is requested as a result of a mutilation of this Warrant, then
the Holder shall deliver such mutilated Warrant to the Company as a
condition precedent to the Company's obligation to issue the New Warrant.

         8.       Reservation of Warrant Shares. The Company covenants that it
                  -----------------------------
will at all times reserve and keep available out of the aggregate of its
authorized but unissued and otherwise unreserved Common Stock, solely for
the purpose of enabling it to issue Warrant Shares upon exercise of this
Warrant as herein provided, the number of Warrant Shares which are then
issuable and deliverable upon the exercise of this entire Warrant, free from
preemptive rights or any other contingent purchase rights of persons other
than the Holder (taking into account the adjustments and restrictions of
Section 9). The Company covenants that all Warrant Shares so issuable and
---------
deliverable shall, upon issuance and the payment of the applicable Exercise
Price in accordance with the terms hereof, be duly and validly authorized,
issued and fully paid and nonassessable.

         9.       Certain Adjustments. The Exercise Price and number of Warrant
                  -------------------
Shares issuable upon exercise of this Warrant are subject to adjustment from
time to time as set forth in this Section 9.
                                  ---------

                  (a)      Stock Dividends and Splits. If the Company, at any
                           --------------------------
time while this Warrant is outstanding, (i) pays a stock dividend on its
Common Stock or otherwise makes a distribution on any class of capital stock
that is payable in shares of Common Stock, (ii)

                                     4

<PAGE>
<PAGE>

subdivides outstanding shares of Common Stock into a larger number of
shares, or (iii) combines outstanding shares of Common Stock into a smaller
number of shares, then in each such case the Exercise Price shall be
multiplied by a fraction of which the numerator shall be the number of
shares of Common Stock outstanding immediately before such event and of
which the denominator shall be the number of shares of Common Stock
outstanding immediately after such event. Any adjustment made pursuant to
clause (i) of this paragraph shall become effective immediately after the
record date for the determination of shareholders entitled to receive such
dividend or distribution, and any adjustment pursuant to clause (ii) or
(iii) of this paragraph shall become effective immediately after the
effective date of such subdivision or combination. If any event requiring an
adjustment under this paragraph occurs during the period that an Exercise
Price is calculated hereunder, then the calculation of such Exercise Price
shall be adjusted appropriately to reflect such event.

                  (b)      Pro Rata Distributions. If the Company, at any time
                           ----------------------
while this Warrant is outstanding, distributes to all holders of Common
Stock (i) evidences of its indebtedness, (ii) any security (other than a
distribution of Common Stock covered by the preceding paragraph), (iii)
rights or warrants to subscribe for or purchase any security, or (iv) any
other asset (in each case, "DISTRIBUTED PROPERTY"), then, at the request of
any Holder delivered before the 90th day after the record date fixed for
determination of shareholders entitled to receive such distribution, the
Company will deliver to such Holder, within five Trading Days after such
request (or, if later, on the effective date of such distribution), the
Distributed Property that such Holder would have been entitled to receive in
respect of the Warrant Shares for which such Holder's Warrant could have
been exercised immediately prior to such record date. If such Distributed
Property is not delivered to a Holder pursuant to the preceding sentence,
then upon any exercise of the Warrant that occurs after such record date,
such Holder shall be entitled to receive, in addition to the Warrant Shares
otherwise issuable upon such conversion, the Distributed Property that such
Holder would have been entitled to receive in respect of such number of
Warrant Shares had the Holder been the record holder of such Warrant Shares
immediately prior to such record date. Notwithstanding the foregoing, this
Section 9(b) shall not apply to any distribution of rights or securities in
respect of adoption by the Company of a shareholder rights plan which events
shall be covered by the anti-dilution provisions of Section 9(a).

                  (c)      Fundamental Transactions. If, at any time while this
                           ------------------------
Warrant is outstanding, (1) the Company effects any merger or consolidation
of the Company with or into another Person, (2) the Company effects any sale
of all or substantially all of its assets in one or a series of related
transactions, (3) any tender offer or exchange offer approved or authorized
by the Board of Directors of the Company (whether by the Company or another
Person) is completed pursuant to which holders of Common Stock are permitted
to tender or exchange their shares for other securities, cash or property,
or (4) the Company effects any reclassification of the Common Stock or any
compulsory share exchange pursuant to which the Common Stock is effectively
converted into or exchanged for other securities, cash or property (in any
such case, a "FUNDAMENTAL TRANSACTION"), then the Holder shall have the
right thereafter to receive, upon exercise of this Warrant, the same amount
and kind of securities, cash or property as it would have been entitled to
receive upon the occurrence of such Fundamental Transaction if it had been,
immediately prior to such Fundamental Transaction, the holder of the number
of Warrant Shares then issuable upon exercise in full of this Warrant (the
"ALTERNATE CONSIDERATION"). For purposes of any such exercise, the
determination of the Exercise Price shall be appropriately adjusted to apply
to such Alternate Consideration based on the amount of Alternate

                                     5

<PAGE>
<PAGE>

Consideration issuable in respect of one share of Common Stock in such
Fundamental Transaction, and the Company shall apportion the Exercise Price
among the Alternate Consideration in a reasonable manner reflecting the
relative value of any different components of the Alternate Consideration.
If holders of Common Stock are given any choice as to the securities, cash
or property to be received in a Fundamental Transaction, then the Holder
shall be given the same choice as to the Alternate Consideration it receives
upon any exercise of this Warrant following such Fundamental Transaction. At
the Holder's option and request, any successor to the Company or surviving
entity in such Fundamental Transaction shall, either (1) issue to the Holder
a new warrant substantially in the form of this Warrant and consistent with
the foregoing provisions and evidencing the Holder's right to purchase the
Alternate Consideration for the aggregate Exercise Price upon exercise
thereof, or (2) purchase the Warrant from the Holder for a purchase price,
payable in cash within five Trading Days after such request (or, if later,
on the effective date of the Fundamental Transaction), equal to the Black
Scholes value of the remaining unexercised portion of this Warrant on the
date of such request as well as assumptions reasonably mutually acceptable
to the Company and the Holder, provided, that for purposes of such
                               --------
calculation, the market price of the Common Stock shall be the closing bid
price of the Common Stock on the Trading Day immediately preceding the
public announcement of the Fundamental Transaction and the volatility factor
shall be determined by reference to the 12 month average industry volatility
measures. The terms of any agreement pursuant to which a Fundamental
Transaction is effected shall include terms requiring any such successor or
surviving entity to comply with the provisions of this paragraph (c) and
insuring that the Warrant (or any such replacement security) will be
similarly adjusted upon any subsequent transaction analogous to a
Fundamental Transaction.

                  (d)      Subsequent Equity Sales.

                           (i)     While any portion of this Warrant is
outstanding, if the Company issues any shares of Common Stock or the Company
or any subsidiary thereof issues any rights, warrants, options or other
securities or debt that is convertible into, exchangeable for (any such
securities, "COMMON STOCK EQUIVALENTS") entitling any Person to acquire
shares of Common Stock, at a price per share less than the Exercise Price
(if the holder of the Common Stock or Common Stock Equivalent so issued
shall at any time, whether by operation of purchase price adjustments, reset
provisions, floating conversion, exercise or exchange prices or otherwise,
or due to warrants, options or rights issued in connection with such
issuance, be entitled to receive shares of Common Stock at a price less than
the Exercise Price, such issuance shall be deemed to have occurred for less
than the Exercise Price), then the Exercise Price shall be adjusted to equal
the conversion, exchange or purchase price for such Common Stock or Common
Stock Equivalents (including any reset provisions thereof) at issue and
which adjusted Exercise Price shall continue for as long as this Warrants
remain outstanding. Such adjustment shall be made whenever such Common Stock
or Common Stock Equivalents are issued. The Company shall notify the Holder
in writing, no later than the Trading Day following the issuance of any
Common Stock or Common Stock Equivalent subject to this section, indicating
therein the applicable issuance price, or of applicable reset price,
exchange price, conversion price and other pricing terms.

                           (ii)    For purposes of this subsection 9(d), the
following subsections (d)(ii)(l) to (d)(ii)(6) shall also be applicable:

                                     6

<PAGE>
<PAGE>

                                   (1)      Issuance of Rights or Options.
                                            -----------------------------
In case at any time the Company shall in any manner grant (directly and not by
assumption in a merger or otherwise) any warrants or other rights to
subscribe for or to purchase, or any options for the purchase of, Common
Stock or any stock or security convertible into or exchangeable for Common
Stock (such warrants, rights or options being called "OPTIONS" and such
convertible or exchangeable stock or securities being called "CONVERTIBLE
SECURITIES") whether or not such Options or the right to convert or exchange
any such Convertible Securities are immediately exercisable, and the price
per share for which Common Stock is issuable upon the exercise of such
Options or upon the conversion or exchange of such Convertible Securities
(determined by dividing (i) the sum (which sum shall constitute the
applicable consideration) of (x) the total amount, if any, received or
receivable by the Company as consideration for the granting of such Options,
plus (y) the aggregate amount of additional consideration payable to the
Company upon the exercise of all such Options, plus (z), in the case of such
Options which relate to Convertible Securities, the aggregate amount of
additional consideration, if any, payable upon the issue or sale of such
Convertible Securities and upon the conversion or exchange thereof, by (ii)
the total maximum number of shares of Common Stock issuable upon the
exercise of such Options or upon the conversion or exchange of all such
Convertible Securities issuable upon the exercise of such Options) shall be
less than the Exercise Price in effect immediately prior to the time of the
granting of such Options, then the total number of shares of Common Stock
issuable upon the exercise of such Options or upon conversion or exchange of
the total amount of such Convertible Securities issuable upon the exercise
of such Options shall be deemed to have been issued for such price per share
as of the date of granting of such Options or the issuance of such
Convertible Securities and thereafter shall be deemed to be outstanding for
purposes of adjusting the Exercise Price. Except as otherwise provided in
subsection 9(d)(ii)(3), no adjustment of the Exercise Price shall be made
upon the actual issue of such Common Stock or of such Convertible Securities
upon exercise of such Options or upon the actual issue of such Common Stock
upon conversion or exchange of such Convertible Securities.

                                   (2)      Issuance of Convertible Securities.
                                            ----------------------------------
In case the Company shall in any manner issue (directly and not by
assumption in a merger or otherwise) or sell any Convertible Securities,
whether or not the rights to exchange or convert any such Convertible
Securities are immediately exercisable, and the price per share for which
Common Stock is issuable upon such conversion or exchange (determined by
dividing (i) the sum (which sum shall constitute the applicable
consideration) of (x) the total amount received or receivable by the Company
as consideration for the issue or sale of such Convertible Securities, plus
(y) the aggregate amount of additional consideration, if any, payable to the
Company upon the conversion or exchange thereof, by (ii) the total number of
shares of Common Stock issuable upon the conversion or exchange of all such
Convertible Securities) shall be less than the Exercise Price in effect
immediately prior to the time of such issue or sale, then the total maximum
number of shares of Common Stock issuable upon conversion or exchange of all
such Convertible Securities shall be deemed to have been issued for such
price per share as of the date of the issue or sale of such Convertible
Securities and thereafter shall be deemed to be outstanding for purposes of
adjusting the Exercise Price, provided that (a) except as otherwise provided
in subsection 9(d)(ii)(3), no adjustment of the Exercise Price shall be made
upon the actual issuance of such Common Stock upon conversion or exchange of
such Convertible Securities and (b) no further adjustment of the Exercise
Price shall be made by reason of the

                                     7

<PAGE>
<PAGE>

issue or sale of Convertible Securities upon exercise of any Options to
purchase any such Convertible Securities for which adjustments of the
Exercise Price have been made pursuant to the other provisions of
subsection 9(d).

                                   (3)      Change in Option Price or
                                            -------------------------
Conversion Rate. Upon the happening of any of the following events, namely,
---------------
if the purchase price provided for in any Option referred to in subsection
9(d)(ii)(l) hereof, the additional consideration, if any, payable upon the
conversion or exchange of any Convertible Securities referred to in
subsections 9(d)(ii)(l) or 9(d)(ii)(2), or the rate at which Convertible
Securities referred to in subsections 9(d)(ii)(l) or 9(d)(ii)(2) are
convertible into or exchangeable for Common Stock shall change at any time
(including, but not limited to, changes under or by reason of provisions
designed to protect against dilution), the Exercise Price in effect at the
time of such event shall forthwith be readjusted to the Exercise Price which
would have been in effect at such time had such Options or Convertible
Securities still outstanding provided for such changed purchase price,
additional consideration or conversion rate, as the case may be, at the time
initially granted, issued or sold. On the termination of any Option for
which any adjustment was made pursuant to this subsection 9(d) or any right
to convert or exchange Convertible Securities for which any adjustment was
made pursuant to this subsection 9(d) (including without limitation upon the
redemption or purchase for consideration of such Convertible Securities by
the Company), the Exercise Price then in effect hereunder shall forthwith be
changed to the Exercise Price which would have been in effect at the time of
such termination had such Option or Convertible Securities, to the extent
outstanding immediately prior to such termination, never been issued.

                                   (4)      Stock Dividends. Subject to the
                                            ---------------
provisions of this Section 9(d), in case the Company shall declare a
dividend or make any other distribution upon any stock of the Company (other
than the Common Stock) payable in Common Stock, Options or Convertible
Securities, then any Common Stock, Options or Convertible Securities, as the
case may be, issuable in payment of such dividend or distribution shall be
deemed to have been issued or sold without consideration.

                                   (5)      Consideration for Stock. In case
                                            -----------------------
any shares of Common Stock, Options or Convertible Securities shall be
issued or sold for cash, the consideration received therefor shall be deemed
to be the net amount received by the Company therefor, after deduction
therefrom of any expenses incurred or any underwriting commissions or
concessions paid or allowed by the Company in connection therewith. In case
any shares of Common Stock, Options or Convertible Securities shall be
issued or sold for a consideration other than cash, the amount of the
consideration other than cash received by the Company shall be deemed to be
the fair value of such consideration as determined in good faith by the
Board of Directors of the Company, after deduction of any expenses incurred
or any underwriting commissions or concessions paid or allowed by the
Company in connection therewith. In case any Options shall be issued in
connection with the issue and sale of other securities of the Company,
together comprising one integral transaction in which no specific
consideration is allocated to such Options by the parties thereto, such
Options shall be deemed to have been issued for such consideration as
determined in good faith by the Board of Directors of the Company. If Common
Stock, Options or Convertible Securities shall be issued or sold by the
Company and, in connection therewith, other Options or Convertible
Securities (the "ADDITIONAL RIGHTS") are

                                     8

<PAGE>
<PAGE>

issued, then the consideration received or deemed to be received by the
Company shall be reduced by the fair market value of the Additional Rights
(as determined using the Black-Scholes option pricing model or another
method mutually agreed to by the Company and the Holder). The Board of
Directors of the Company shall respond promptly, in writing, to an inquiry
by the Holders as to the fair market value of the Additional Rights. In the
event that the Board of Directors of the Company and the Holders are unable
to agree upon the fair market value of the Additional Rights, the Company
and the Holders shall jointly select an appraiser, who is experienced in
such matters. The decision of such appraiser shall be final and conclusive,
and the cost of such appraiser shall be borne evenly by the Company and the
Holder.

                                   (6)      Record Date. In case the Company
                                            -----------
shall take a record of the holders of its Common Stock for the purpose of
entitling them (i) to receive a dividend or other distribution payable in
Common Stock, Options or Convertible Securities or (ii) to subscribe for or
purchase Common Stock, Options or Convertible Securities, then such record
date shall be deemed to be the date of the issue or sale of the shares of
Common Stock deemed to have been issued or sold upon the declaration of such
dividend or the making of such other distribution or the date of the
granting of such right of subscription or purchase, as the case may be.

                           (iii)   Notwithstanding the foregoing, no adjustment
will be made under this Section 9(d) as a result of: (i) the issuance of
securities upon the exercise or conversion of any Common Stock Equivalents
issued by the Company prior to the date of this Agreement (but will apply to
any amendments, modifications and reissuances thereof), (ii) the grant of
options or warrants, or the issuance of additional securities, under any
duly authorized company stock option, stock incentive plan, restricted stock
plan or stock purchase plan in existence on the First Closing Date, (iii)
the issuance of Common Stock in payment of interest on the 2005 Notes, 2004
Notes, the 2003 Debentures, the 2004 Debentures or the Notes, (iv) the
issuance of Common Stock Equivalents pursuant to a Strategic Transaction, or
(v) the issuance of Common Stock pursuant to the provisions of Section 2(c)
of the Registration Rights Agreement.

                  (e)      Number of Warrant Shares. Simultaneously with any
                           ------------------------
adjustment to the Exercise Price pursuant to paragraph (a) of this Section,
the number of Warrant Shares that may be purchased upon exercise of this
Warrant shall be increased or decreased proportionately, so that after such
adjustment the aggregate Exercise Price payable hereunder for the adjusted
number of Warrant Shares shall be the same as the aggregate Exercise Price
in effect immediately prior to such adjustment.

                  (f)      Calculations. All calculations under this Section 9
                           ------------                              ---------
shall be made to the nearest cent or the nearest 1/100th of a share, as
applicable. The number of shares of Common Stock outstanding at any given
time shall not include shares owned or held by or for the account of the
Company, and the disposition of any such shares shall be considered an issue
or sale of Common Stock.

                  (g)      Notice of Adjustments. Upon the occurrence of each
                           ---------------------
adjustment pursuant to this Section 9, the Company at its expense will
                            ---------
promptly compute such adjustment in accordance with the terms of this
Warrant and prepare a certificate setting forth such adjustment, including a
statement of the adjusted Exercise Price and adjusted number or type of
Warrant

                                     9

<PAGE>
<PAGE>

Shares or other securities issuable upon exercise of this Warrant (as
applicable), describing the transactions giving rise to such adjustments and
showing in detail the facts upon which such adjustment is based. Upon
written request, the Company will promptly deliver a copy of each such
certificate to the Holder and to the Company's transfer agent.

                  (h)      Notice of Corporate Events. If the Company (i)
                           --------------------------
declares a dividend or any other distribution of cash, securities or other
property in respect of its Common Stock, including without limitation any
granting of rights or warrants to subscribe for or purchase any capital
stock of the Company or any Subsidiary, (ii) authorizes or approves, enters
into any agreement contemplating or solicits shareholder approval for any
Fundamental Transaction or (iii) authorizes the voluntary dissolution,
liquidation or winding up of the affairs of the Company, then the Company
shall deliver to the Holder a notice describing the material terms and
conditions of such transaction, at least 20 calendar days prior to the
applicable record or effective date on which a Person would need to hold
Common Stock in order to participate in or vote with respect to such
transaction, and the Company will take all steps reasonably necessary in
order to insure that the Holder is given the practical opportunity to
exercise this Warrant prior to such time so as to participate in or vote
with respect to such transaction; provided, however, that the failure to
deliver such notice or any defect therein shall not affect the validity of
the corporate action required to be described in such notice.

         10.      Payment of Exercise Price. The Holder may pay the Exercise
                  -------------------------
Price in one of the following manners:

                  (a)      Cash Exercise. The Holder may deliver immediately
                           -------------
available funds; or

                  (b)      Cashless Exercise. The Holder may notify the Company
                           -----------------
in an Exercise Notice of its election to utilize cashless exercise, in which
event the Company shall issue to the Holder the number of Warrant Shares
determined as follows:

                                   X = Y [(A-B)/A]

                           where:

                                   X = the number of Warrant Shares to be
                                   issued to the Holder.

                                   Y = the number of Warrant Shares with
                                   respect to which this Warrant is being
                                   exercised.

                                   A = the average of the closing prices
                                   for the five Trading Days immediately
                                   prior to (but not including) the
                                   Exercise Date.

                                   B = the Exercise Price.

For purposes of Rule 144 promulgated under the Securities Act, it is
intended, understood and acknowledged that the Warrant Shares issued in a
cashless exercise transaction shall be deemed to have been acquired by the
Holder, and the holding period for the Warrant Shares shall be deemed to
have commenced, on the date this Warrant was originally issued.

                                     10

<PAGE>
<PAGE>

         11.      Limitations on Exercise.
                  -----------------------

                           (i)     Notwithstanding anything to the contrary
contained herein, the number of shares of Common Stock that may be acquired
by a Holder upon any exercise of Warrants (or otherwise in respect hereof)
shall be limited to the extent necessary to insure that, following such
exercise (or other issuance), the total number of shares of Common Stock
then beneficially owned by such Holder and its Affiliates and any other
Persons whose beneficial ownership of Common Stock would be aggregated with
such Holder's for purposes of Section 13(d) of the Exchange Act, does not
exceed 4.999% (the "THRESHOLD PERCENTAGE") or 9.999% (the "MAXIMUM
PERCENTAGE") of the total number of issued and outstanding shares of Common
Stock (including for such purpose the shares of Common Stock issuable upon
such conversion). For such purposes, beneficial ownership shall be
determined in accordance with Section 13(d) of the Exchange Act and the
rules and regulations promulgated thereunder. Each delivery of an Exercise
Notice hereunder will constitute a representation by the Holder that it has
evaluated the limitation set forth in this paragraph and determined that
issuance of the full number of Warrant Shares requested in such Exercise
Notice is permitted under this paragraph. The Company's obligation to issue
shares of Common Stock in excess of the limitation referred to in this
Section shall be suspended (and shall not terminate or expire
notwithstanding any contrary provisions hereof) until such time, if any, as
such shares of Common Stock may be issued in compliance with such
limitation, but in no event later than the Expiration Date. By written
notice to the Company, the Holder may waive the provisions of this Section
or increase or decrease the Maximum Percentage to any other percentage
specified in such notice, but (i) any such waiver or increase will not be
effective until the 61st day after such notice is delivered to the Company,
and (ii) any such waiver or increase or decrease will apply only to the
Holder and not to any other holder of Warrants.

                           (ii)    Notwithstanding anything to the contrary
in this Warrant, if the Company has not previously obtained Shareholder
Approval (as defined below), then the Company may not issue shares of Common
Stock in excess of the (a) the Issuable Maximum or (b) a number of shares
above which the issuance of one additional share would cause a Change of
Control (a "CHANGE OF CONTROL THRESHOLD") upon exercise of this Warrant at
an exercise price which is less than the Closing Price on the Trading Day
immediately preceding the Original Issue Date (the "THRESHOLD PRICE"). The
"Issuable Maximum" means, as of any date, a number of shares of Common Stock
equal to 19.99% of the outstanding shares of Common Stock immediately
preceding the First Closing Date, less such number of shares of Common Stock
as have been issued at a price below the Threshold Price (1) upon exercise
of the Warrants and warrants issued under the 2003 Securities Purchase
Agreement, the 2004 Securities Purchase Agreement, 2004 Loan Agreement or
the 2005 Loan Agreement, (2) upon conversion of the 2003 Debentures, the
2004 Debentures, the 2004 Notes, and the 2005 Notes and (3) upon conversion
of the Notes, or in payment of interest thereunder. Each Holder shall be
entitled to a portion of the Issuable Maximum or Change of Control
Threshold, as applicable, equal to the quotient obtained by dividing: (x)
the principal amount of Notes issued and sold to such Holder on the Original
Issue Date by (y) the aggregate principal amount of all Notes issued and
sold by the Company on the Original Issue Date. If any Holder shall no
longer hold Notes, then such Holder's remaining portion of the Issuable
Maximum or Change of Control Threshold, as applicable, (other than those
represented by the remaining portion of this Warrant and the other warrants
referenced in clause (1) above) shall be allocated pro-rata among the
remaining Holders, giving effect to the Company's desire to allocate among
the class of securities known as

                                     11

<PAGE>
<PAGE>

the Notes this limitation. If on any Date of Exercise, or at such time as a
Holder shall notify the Company that the condition in (A) following this
clause shall be in effect: (A) the aggregate number of shares of Common
Stock that would then be issuable upon exercise in full of this Warrant
would exceed the Issuable Maximum or would exceed the Change of Control
Threshold on such date, and (B) the Company shall not have previously
obtained the vote of shareholders applicable to approve the issuance of
shares of Common Stock in excess of the Issuable Maximum or Change of
Control Threshold, as applicable, pursuant to the terms hereof (the
"SHAREHOLDER APPROVAL"), then, the Company shall, on such Date of Exercise
or on any Date of Exercise prior to the receipt by the Company of the
Shareholder Approval, shall issue upon exercise hereof a number of shares of
Common Stock equal to the Issuable Maximum or Change of Control Threshold,
as applicable, and, with respect to the remainder of this Warrant for which
an exercise would result in an issuance of shares of Common Stock in excess
of the Issuable Maximum or Change of Control Threshold, the Company must
seek Shareholder Approval in accordance with subsection (iii) below. The
Company and the Holder understand and agree that shares of Common Stock
issued to and then held by the Holder as a result of exercises of this
Warrant shall not be entitled to cast votes on any resolution to obtain
Shareholder Approval pursuant hereto.

                           (iii)   Shareholder Approval.
                                   --------------------

                                   (1)      The Company shall use its best
efforts to obtain as soon as possible but in no event later than 90 days
following the date of the Loan Agreement or 120 days in the event the proxy
materials shall be reviewed by the Commission, shareholder approval of the
issuance of the Underlying Shares (the "SHAREHOLDER PROPOSAL"), which
approval shall meet the requirements of Nasdaq's Rule 4350(i) of Nasdaq set
forth in the NASD Manual (the "SHAREHOLDER APPROVAL DATE").

                                   (2)      As soon as practicable following
the date of the Loan Agreement, but in no event more than 30 days following
the date of the Loan Agreement, the Company shall prepare and file with the
Commission proxy materials calling a special meeting (the "SPECIAL MEETING")
of its shareholders seeking approval of the Shareholder Proposal. The
Company shall use its reasonable best efforts to cause such proxy materials
to reach the "no further comment" stage as soon as possible (the "CLEARANCE
DATE") and to hold the Special Meeting as soon as possible following the
Clearance Date, but in no event later than 45 days following the Clearance
Date.

                                   (3)      The Board of Directors shall
recommend approval thereof by the Company's shareholders. The Company shall
mail and distribute its proxy materials for the Special Meeting to its
shareholders at least 30 days prior to the date of the Special Meeting and
shall actively solicit proxies to vote for the Shareholder Proposal. The
Company shall provide the Holders an opportunity to review and comment on
such proxy materials by providing (which may be by e-mail) copies of such
proxy materials and any revised preliminary proxy materials to the Holders
at least three (3) days prior to their filing with the Commission. The
Company shall provide the Holders (which may be by e-mail) copies of all
correspondence from or to the Commission or its staff concerning the proxy
materials for the Special Meeting promptly after the same is sent or
received by the Company and summaries of any comments of

                                     12

<PAGE>
<PAGE>

the Commission's staff which the Company receives orally promptly after
receiving such oral comments. The Company shall (i) furnish to the Holders
and their counsel (which may be by e-mail) a copy of its definitive proxy
materials for the Special Meeting and any amendments or supplements thereto
promptly after the same are first used, mailed to shareholders or filed with
the Commission, (ii) inform the Holders of the progress of solicitation of
proxies for such meeting and (iii) inform the Holders of any adjournment of
the Special Meeting and shall report the result of the vote of shareholders
on the Shareholder Proposal at the conclusion of the Special Meeting.

                                   (4)      If for any reason the Shareholder
Proposal is not approved at the Special Meeting, the Company will take such
additional acts or actions as are necessary to hold an additional Special
Meeting to consider the Shareholder Proposal and in conjunction therewith
shall hire a nationally recognized proxy solicitation firm, selected by the
Holders which is reasonably satisfactory to the Company, to assist it in
obtaining the necessary shareholder votes to approve the Shareholder
Proposal. The Company shall bear all costs and expenses of the preparation
and filing of any and all proxy materials and Special Meetings, including
but not limited to the costs and expenses of the proxy solicitation firm if
needed.

         12.      No Fractional Shares. No fractional shares of Warrant Shares
                  --------------------
will be issued in connection with any exercise of this Warrant. In lieu of
any fractional shares which would, otherwise be issuable, the Company shall
pay cash equal to the product of such fraction multiplied by the closing
price of one Warrant Share as reported by the applicable Trading Market on
the date of exercise.

         13.      Notices. Any and all notices or other communications or
                  -------
deliveries hereunder (including, without limitation, any Exercise Notice)
shall be in writing and shall be deemed given and effective on the earliest
of (i) the date of transmission, if such notice or communication is
delivered via facsimile at the facsimile number specified in this Section
prior to 6:30 p.m. (New York City time) on a Trading Day, (ii) the next
Trading Day after the date of transmission, if such notice or communication
is delivered via facsimile at the facsimile number specified in this Section
on a day that is not a Trading Day or later than 6:30 p.m. (New York City
time) on any Trading Day, (iii) the Trading Day following the date of
mailing, if sent by nationally recognized overnight courier service, or (iv)
upon actual receipt by the party to whom such notice is required to be
given. The addresses for such communications shall be: (i) if to the
Company, to Zoltek Companies, Inc., 3101 McKelvey Road, St. Louis, Missouri
63044, Attn: Chief Financial Officer, Facsimile No.: (314) 291-9082, or (ii)
if to the Holder, to the address or facsimile number appearing on the
Warrant Register or such other address or facsimile number as the Holder may
provide to the Company in accordance with this Section.

         14.      Warrant Agent. The Company shall serve as warrant agent
                  -------------
under this Warrant. Upon 30 days' notice to the Holder, the Company may
appoint a new warrant agent. Any corporation into which the Company or any
new warrant agent may be merged or any corporation resulting from any
consolidation to which the Company or any new warrant agent shall be a party
or any corporation to which the Company or any new warrant agent transfers
substantially all of its corporate trust or shareholders services business
shall be a successor warrant agent under this Warrant without any further
act. Any such successor warrant agent

                                     13

<PAGE>
<PAGE>

shall promptly cause notice of its succession as warrant agent to be mailed
(by first class mail, postage prepaid) to the Holder at the Holder's last
address as shown on the Warrant Register.

         15.      Miscellaneous.
                  -------------

                  (a)      This Warrant shall be binding on and inure to the
benefit of the parties hereto and their respective successors and assigns.
Subject to the preceding sentence, nothing in this Warrant shall be
construed to give to any Person other than the Company and the Holder any
legal or equitable right, remedy or cause of action under this Warrant. This
Warrant may be amended only in writing signed by the Company and the Holder
and their successors and assigns.

                  (b)      All questions concerning the construction, validity,
enforcement and interpretation of this Warrant shall be governed by and
construed and enforced in accordance with the internal laws of the State of
New York, without regard to the principles of conflicts of law thereof. Each
party agrees that all legal proceedings concerning the interpretations,
enforcement and defense of this Warrant and the transactions herein
contemplated ("PROCEEDINGS") (whether brought against a party hereto or its
respective Affiliates, employees or agents) shall be commenced exclusively
in the state and federal courts sitting in the City of New York, Borough of
Manhattan (the "NEW YORK COURTS"). Each party hereto hereby irrevocably
submits to the exclusive jurisdiction of the New York Courts for the
adjudication of any dispute hereunder or in connection herewith or with any
transaction contemplated hereby or discussed herein, and hereby irrevocably
waives, and agrees not to assert in any Proceeding, any claim that it is not
personally subject to the jurisdiction of any New York Court, or that such
Proceeding has been commenced in an improper or inconvenient forum. Each
party hereto hereby irrevocably waives personal service of process and
consents to process being served in any such Proceeding by mailing a copy
thereof via registered or certified mail or overnight delivery (with
evidence of delivery) to such party at the address in effect for notices to
it under this Warrant and agrees that such service shall constitute good and
sufficient service of process and notice thereof. Nothing contained herein
shall be deemed to limit in any way any right to serve process in any manner
permitted by law. Each party hereto hereby irrevocably waives, to the
fullest extent permitted by applicable law, any and all right to trial by
jury in any legal proceeding arising out of or relating to this Warrant or
the transactions contemplated hereby. If either party shall commence a
Proceeding to enforce any provisions of this Warrant, then the prevailing
party in such Proceeding shall be reimbursed by the other party for its
attorney's fees and other costs and expenses incurred with the
investigation, preparation and prosecution of such Proceeding.

                  (c)      The headings herein are for convenience only, do not
constitute a part of this Warrant and shall not be deemed to limit or affect
any of the provisions hereof.

                                     14

<PAGE>
<PAGE>

                  (d)      In case any one or more of the provisions of this
Warrant shall be invalid or unenforceable in any respect, the validity and
enforceability of the remaining terms and provisions of this Warrant shall
not in any way be affected or impaired thereby and the parties will attempt
in good faith to agree upon a valid and enforceable provision which shall be
a commercially reasonable substitute therefor, and upon so agreeing, shall
incorporate such substitute provision in this Warrant.

                [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK,
                           SIGNATURE PAGE FOLLOWS]

                                     15

<PAGE>
<PAGE>

         IN WITNESS WHEREOF, the Company has caused this Warrant to be duly
executed by its authorized officer as of the date first indicated above.

                                   ZOLTEK COMPANIES, INC.

                                   By:
                                       -----------------------------------------
                                       Name:
                                       Title:

                                     16

<PAGE>
<PAGE>

                               EXERCISE NOTICE

To ZOLTEK COMPANIES, INC.:

         The undersigned hereby irrevocably elects to purchase _____________
shares of common stock, par value $0.01 per share, of ZOLTEK COMPANIES, INC.
("COMMON STOCK"), pursuant to Warrant No. [ ], originally issued [ ], 2005
(the "WARRANT"), and, if such Holder is not utilizing the cashless exercise
provisions set forth in the Warrant, encloses herewith $________ in cash,
certified or official bank check or checks or other immediately available
funds, which sum represents the aggregate Exercise Price (as defined in the
Warrant) for the number of shares of Common Stock to which this Exercise
Notice relates, together with any applicable taxes payable by the
undersigned pursuant to the Warrant.

         By its delivery of this Exercise Notice, the undersigned represents
and warrants to the Company that in giving effect to the exercise evidenced
hereby the Holder will not beneficially own in excess of the number of
shares of Common Stock (determined in accordance with Section 13(d) of the
Securities Exchange Act of 1934) permitted to be owned under Section 11 of
this Warrant to which this notice relates.

         The undersigned requests that certificates for the shares of Common
Stock issuable upon this exercise be issued in the name of

                                            PLEASE INSERT SOCIAL SECURITY OR
                                            TAX IDENTIFICATION NUMBER

                       (Please print name and address)

                                     17

<PAGE>
<PAGE>

<TABLE>
                                 Warrant Shares Exercise Log
                                 ---------------------------

<CAPTION>
---------------------------------------------------------------------------------------------
Date                  Number of Warrant         Number of Warrant Shares      Number of
                      Shares Available to be    Exercised                     Warrant Shares
                      Exercised                                               Remaining to
                                                                              be Exercised
---------------------------------------------------------------------------------------------
<S>                   <C>                       <C>                           <C>

---------------------------------------------------------------------------------------------
</TABLE>

                                     18

<PAGE>
<PAGE>

                             FORM OF ASSIGNMENT

         [To be completed and signed only upon transfer of Warrant]

         FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto ________________________________ the right represented by the
within Warrant to purchase ____________ shares of Common Stock of ZOLTEK
COMPANIES, INC. to which the within Warrant relates and appoints
________________ attorney to transfer said right on the books of the Company
with full power of substitution in the premises.

Dated:   _______________, ____

                                   ---------------------------------------
                                   (Signature must conform in all respects
                                   to name of holder as specified on the
                                   face of the Warrant)

                                   ---------------------------------------
                                   Address of Transferee

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

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

In the presence of:

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

                                     19

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