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                                  PENWEST, LTD.

                                STOCK OPTION PLAN
                                       FOR
                             NON-EMPLOYEE DIRECTORS


1.                PURPOSE.

                  The purpose of the PENWEST, LTD. Stock Option Plan for
Non-Employee Directors (the "Plan") is to promote the interests of PENWEST, LTD.
(the "Corporation") and its shareholders by encouraging Non-Employee Directors
of the Corporation to have a direct and personal stake in the performance of the
Corporation's Common Stock.

2.                DEFINITIONS.

                  Unless the context clearly indicates otherwise, the following
terms have the meanings set forth below.

                  "Annual Option" means a stock option granted under Section 7.

                  "Board of Directors" or "Board" means the Board of Directors
                  of the Corporation.

                  "Business Day" means any day except Saturday, Sunday or a
                  legal holiday in the State of Washington.

                  "Change in Control" means (i) the first purchase of shares
                  pursuant to a tender offer or exchange offer (other than a
                  tender offer or exchange offer by the Corporation) for all or
                  part of the Common Stock or any securities convertible into
                  Common Stock, (ii) the receipt by the Corporation of a
                  Schedule 13D or other advice indicating that a person is the
                  "beneficial owner" (as defined in Rule 13d-3 under the
                  Exchange Act) of 20% or more of the Common Stock, (iii) the
                  date of approval by the shareholders of the Corporation of an
                  agreement providing for any consolidation or merger of the
                  Corporation in which the Corporation will not be the
                  continuing or surviving corporation or pursuant to which
                  shares of Common Stock would be converted into cash,
                  securities or other property, other than a merger of the
                  Corporation in which the holders of Common Stock immediately
                  prior to the merger would have the same proportion of
                  ownership of common stock of the surviving corporation
                  immediately after the merger, (iv) the date of approval by the
                  shareholders of the Corporation of any sale, lease, exchange
                  or other transfer (in one transaction or a series of related
                  transactions) of all or substantially all the assets of the
                  Corporation, (v) the adoption of any plan or proposal for the
                  liquidation (but not a partial liquidation) or dissolution of
                  the Corporation or (vi) the date upon which the individuals
                  who constitute the Board


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                  of Directors as of September 1, 1995 (the "Incumbent Board")
                  cease to constitute at least a majority of the Board, provided
                  that any person becoming a director subsequent to such date
                  whose election, or nomination for election by the
                  Corporation's shareholders, was approved by at least
                  two-thirds of the directors comprising the Incumbent Board
                  shall be considered as though such person were a member of the
                  Incumbent Board.

                  "Code" means the Internal Revenue Code of 1986, as amended.

                  "Committee" means the Compensation Committee of the Board of
                  Directors.

                  "Common Stock" means the common stock of PENWEST, LTD.

                  "Compensation" means for any Plan Year all retainer, meeting
                  and committee fees payable to a Non-Employee Director for
                  service on the Board of Directors and any board of directors
                  of the Corporation's Subsidiaries (a "Subsidiary Board").

                  "Deferral Election" means an election by a Non-Employee
                  Director under Section 8 to receive Deferred Compensation
                  Options in lieu of all of such Director's Compensation.

                  "Deferred Compensation Option" means a stock option granted in
                  connection with a Deferral Election under Section 8.

                  "Disability," as applied to a Grantee, has the meaning set
                  forth in Section 22(e)(3) of the Code.

                  "Exchange Act" means the Securities Exchange Act of 1934, as
                  amended.

                  "Fair Market Value" of a share of Common Stock on any
                  particular date means, (i) if the Common Stock is traded on
                  the NASDAQ National Market System, the last sales price of a
                  share of Common Stock on such system as reported for that date
                  by NASDAQ, and if no such sales are reported for such date,
                  the last sales price as reported by NASDAQ for the next
                  preceding date on which the sale of a share of Common Stock
                  took place, or (ii) if the Common Stock is traded on a
                  national exchange, the closing price of a share of Common
                  Stock on such exchange as reported for that date by the
                  principal consolidated transaction reporting system for such
                  exchange, and if no such sales are reported for such date, the
                  closing price as reported by such system for the next
                  preceding date on which the sale of a share of Common Stock
                  took place.

                  "Grant Date," as used with respect to an Option, means the
                  date on which such Option is granted pursuant to the Plan.


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                 "Grantee" means the Non-Employee Director to whom an Option is
                  granted pursuant to the Plan.

                  "Non-Employee Director" means a member of the Board of
                  Directors who is not an employee of the Corporation or any
                  Subsidiary.

                  "Option" means an Annual Option or a Deferred Compensation
                  Option granted pursuant to the Plan to purchase shares of
                  Common Stock which shall be a non-qualified stock option not
                  intended to qualify as an incentive stock option under Section
                  422 of the Code. Reference to "Options" shall include Annual
                  Options and Deferred Compensation Options.

                  "Payment Date" means September 1, December 1, March 1, and
                  June 1 in a Plan Year.

                  "Plan" means the PENWEST, LTD. Stock Option Plan for
                  Non-Employee Directors as set forth herein and as amended from
                  time to time.

                  "Plan Year" means each fiscal year beginning on September 1
                  and ending on August 31, commencing with the fiscal year
                  beginning on September 1, 1995.

                  "Retirement," as applied to a Non-Employee Director, means
                  when such Director ceases to serve as a member of the Board
                  because of failure to meet the eligibility requirements set
                  forth in the Corporation's bylaws.

                  "Subsidiary" means a "subsidiary corporation" of the
                  Corporation as defined in Section 425(f) of the Code.

3.                ADMINISTRATION.

                  The Plan shall be administered by the Committee. The Committee
shall have full authority to make such rules and regulations as it deems
necessary to administer the Plan and to interpret and administer the provisions
of the Plan. Any determination, decision or action of the Committee in
connection with the construction, interpretation, administration or application
of the Plan shall be final and binding on all parties.

4.                ELIGIBILITY.

                  The persons eligible to receive Options under the Plan are the
Non-Employee Directors.

5.                EFFECTIVE DATE OF THE PLAN AND TERM OF OPTION PERIOD.

                  The Plan shall become effective upon its adoption by the Board
of Directors, provided, that if the Plan is not approved by the Corporation's
shareholders within 12 months of 


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its adoption by the Board, then the Plan and all awards under the Plan shall be
void from inception. The term during which awards may be granted under the Plan
shall expire on the tenth anniversary of the adoption of the Plan by the Board
of Directors. The period during which an Option granted under the Plan may be
exercised shall expire on the earlier of the tenth anniversary of the Grant Date
of such Option or the third anniversary of the date the Grantee ceases to be a
member of the Board.

6.                SHARES SUBJECT TO THE PLAN.

                  The shares of Common Stock that may be delivered upon the
exercise of Options under the Plan shall be shares of the Corporation's
authorized Common Stock and may be unissued shares or treasury shares. Subject
to adjustment as provided in Section 14, the aggregate number of shares subject
to Option grants under the Plan is 500,000 shares of Common Stock. If any shares
are subject to an Option which expires or terminates during the term of the Plan
prior to the issuance of such shares, such shares shall be available for
issuance under the Plan.

7.                ANNUAL OPTIONS.

                  (a) Grant of Annual Options. Commencing on September 1, 1995
and on each September 1 thereafter during the term of the Plan, each
Non-Employee Director of the Corporation shall automatically be granted a stock
option to purchase the number of shares of Common Stock (rounded to the nearest
share) determined by dividing (i) $10,000 by (ii) 25% of the Fair Market Value
of a share of Common Stock on such September 1, upon the terms and conditions
specified in the Plan. If a Non-Employee Director will not serve during the full
Plan Year due to Retirement, then such Director shall receive a pro rata award
of such shares for such year based on the number of full months of service of
such Director during such year.

                  (b) Terms of Annual Options. Each Annual Option shall have the
following terms and conditions:

                      (i)           Price. The exercise price per share of each
                                    Annual Option shall equal 75% of the Fair
                                    Market Value of a share of Common Stock on
                                    the Grant Date;

                     (ii)           Term. The term of each Annual Option shall
                                    expire on the earlier of the tenth
                                    anniversary of its Grant Date or the third
                                    anniversary of the date the Grantee ceases
                                    to be a member of the Board;

                    (iii)           Time of Exercise. Unless an Annual Option is
                                    terminated or the time of its exercisability
                                    is accelerated in accordance with the Plan,
                                    each Annual Option shall be exercisable in
                                    full following six months from its Grant
                                    Date;


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                     (iv)           Acceleration of Exercisability.
                                    Notwithstanding the schedule provided in
                                    subparagraph (iii), an Annual Option shall
                                    become fully exercisable upon the Grantee's
                                    death or withdrawal from the Board of
                                    Directors by reason of Disability or
                                    Retirement or upon a Change in Control; and

                      (v)           Option Agreement. Each Annual Option shall
                                    be evidenced by an option agreement duly
                                    executed on behalf of the Corporation.

8.                DEFERRED COMPENSATION OPTIONS.

                  (a) Grant of Deferred Compensation Options. On each Payment
Date in a Plan Year, each Non-Employee Director who has made a Deferral Election
pursuant to paragraph (c) for such Plan Year automatically shall be granted a
Deferred Compensation Option to purchase the number of shares of Common Stock
(rounded to the nearest share) determined by dividing (i) the amount of
Compensation payable to such Non-Employee Director as of such Payment Date
divided by (ii) 25% of the Fair Market Value of a share of Common Stock on such
Payment Date.

                  (b) Terms of Deferred Compensation Options. Each Deferred
Compensation Option shall have the following terms and conditions:

                      (i)           Price. The exercise price per share of each
                                    Deferred Compensation Option shall equal 75%
                                    of the Fair Market Value of a share of
                                    Common Stock on the Grant Date;

                     (ii)           Term. The term of each Deferred Compensation
                                    Option shall expire on the earlier of the
                                    tenth anniversary of its Grant Date or the
                                    third anniversary of the date the Grantee
                                    ceases to be a member of the Board;

                    (iii)           Time of Exercise. Unless a Deferred
                                    Compensation Option is terminated or the
                                    time of its exercisability is accelerated in
                                    accordance with the Plan, each Deferred
                                    Compensation Option shall be exercisable in
                                    full following six months from its Grant
                                    Date;

                     (iv)           Acceleration of Exercisability.
                                    Notwithstanding the schedule provided in
                                    subparagraph (iii), a Deferred Compensation
                                    Option shall become fully exercisable upon
                                    the Grantee's death or withdrawal from the
                                    Board by reason of Disability or Retirement
                                    or upon a Change in Control; and


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                      (v)           Option Agreement. Each Deferred Compensation
                                    Option shall be evidenced by an option
                                    agreement duly executed on behalf of the
                                    Corporation.

                  (c) Deferral Elections. Each Non-Employee Director may elect
to receive Deferred Compensation Options in lieu of all of such Non-Employee
Director's Compensation during a Plan Year. Each Deferral Election shall be in
the form of a written notice and shall set forth the Non-Employee Director's
election to receive Deferred Compensation Options during the Plan Year. Each
Deferral Election shall specify the Plan Year covered by the Deferral Election,
must be made not later than 10 days prior to the first day of such Plan Year
covered by the Deferral Election and shall be irrevocable.

9.                EXERCISE OF OPTIONS.

                  (a) Each Option granted shall be exercisable in whole or in
part at any time, or from time to time, during the Option term as specified in
the Plan. The election to exercise an Option shall be made in accordance with
Federal laws and regulations. Each Option may be exercised by delivery of a
written notice to the Corporation stating the number of shares to be exercised
and accompanied by the payment of the Option exercise price therefor in
accordance with this Section. The Grantee shall furnish the Corporation, prior
to the delivery of any shares upon the exercise of an Option, with such other
documents and representations as the Corporation may require, to assure
compliance with laws and regulations.

                  (b) No shares shall be delivered pursuant to the exercise of
any Option until qualified for delivery under securities laws and regulations
and until payment of the Option price is received by the Corporation in cash, by
check or in shares of Common Stock as provided in Section 10.

10.               STOCK AS FORM OF EXERCISE PAYMENT.

                  A Grantee who owns shares of Common Stock may elect to use
previously acquired shares, valued at the Fair Market Value on the last Business
Day preceding the date of delivery of such shares, to pay all or part of the
exercise price of an Option, provided, however, that such form of payment shall
not be permitted unless the shares delivered have been held by the Grantee for
at least six months.

11.               WITHHOLDING TAXES FOR AWARDS.

                  Each Grantee exercising an Option as a condition to such
exercise shall pay to the Corporation the amount, if any, required to be
withheld from distributions resulting from such exercise under federal and state
income tax laws ("Withholding Taxes"). Such Withholding Taxes shall be payable
as of the date income from the award is includable in the Grantee's gross income
for Federal income tax purposes (the "Tax Date"). The Grantee may satisfy this
requirement by remitting to the Corporation in cash or by check the amount of
such Withholding Taxes or a number of previously owned shares of Common Stock
having an aggregate Fair 


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Market Value as of the last Business Day preceding the Tax Date equal to the
amount of such Withholding Taxes.

12.               TRANSFER OF AWARDS.

                  Options granted under the Plan may not be transferred except
by will or the laws of descent and distribution or pursuant to a qualified
domestic relations order, as defined in the Code.

13.               CHANGES IN COMMON STOCK.

                  In the event of a merger, consolidation, reorganization,
recapitalization, stock dividend, stock split or other change in corporate
structure or capitalization affecting the Common Stock, such appropriate
adjustment shall be made in the number, kind, option price and other terms of
shares subject to Options granted under the Plan, including appropriate
adjustment in the maximum number of shares referred to in Section 6, as may be
determined by the Committee.

14.               REGULATORY COMPLIANCE.

                  The Corporation will not be obligated to issue shares of
Common Stock upon the exercise of any Option granted under the Plan if counsel
to the Corporation determines that such issuance would violate any law or
regulation of any governmental authority.

15.               NO RIGHTS AS SHAREHOLDERS.

                  No Grantee, and no beneficiary or other person claiming
through a Grantee, shall have any interest in any shares of Common Stock
allocated for the purpose of the Plan or subject to any award until such person
shall have become a holder of record of such shares.

16.               BOARD MEMBERSHIP.

                  Nothing in the Plan or in any Option shall confer upon any
Grantee any right to continue as a director of the Corporation.

17.               AMENDMENT AND DISCONTINUANCE.

                  Subject to the limitation that the provisions of the Plan
shall not be amended more than once every six months other than to comport with
changes in the Code, the Employee Retirement Income Security Act or the rules
thereunder, the Board of Directors may amend, suspend, or discontinue the Plan,
but may not, without the approval of a majority of the holders of the Common
Stock, make any amendment which would (a) materially increase the benefits
accruing to Grantees under the Plan, (b) materially increase the number of
shares which may be issued under the Plan, or (c) materially modify the
requirements as to eligibility for participation in the Plan.


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18.               COMPLIANCE WITH RULE 16b-3.

                  The Plan and all awards under the Plan are intended to satisfy
the conditions of Rule 16b-3 of the Securities and Exchange Commission, and all
provisions of the Plan shall be construed so as to effectuate that intent. If
any provision of the Plan is found not to comply with Rule 16b-3, then such
provision shall be deemed to be of no force and effect.

                  Adopted by the Board of Directors on August 14, 1995, subject
to approval of the Corporation's shareholders.


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