EXHIBIT 3.3

                            CERTIFICATE OF AMENDMENT
                                       OF
                          CERTIFICATE OF INCORPORATION

                  Westlake Vinyl Corporation ("Corporation"), a corporation
organized and existing under and by virtue of the General Corporation Law of the
State of Delaware, does hereby certify:

                  FIRST: That in lieu of a meeting and vote of directors, the
Board of Directors of the Corporation, by unanimous written consent filed with
the Corporation, in accordance with the provisions of Section 141(f) of the
General Corporation Law of the State of Delaware, have adopted a resolution
proposing and declaring advisable the following amendment to the Certificate of
Incorporation of the Corporation:

                  RESOLVED, That the Certificate of Incorporation be amended by
changing Article I to read as follows:

                                    ARTICLE I

                  The name of the corporation is Westlake Chemical Corporation.

                  SECOND: That in lieu of a meeting and vote of stockholders,
the stockholders of all outstanding stock entitled to vote thereon have given
written consent to the above amendment in accordance with Section 228 of the
General Corporation Law of the State of Delaware, and said written consent has
been filed with the Corporation.

                  THIRD: That said amendments were duly adopted in accordance
with the provisions of Section 141, 216, 228, and 242 of the General Corporation
Law of the State of Delaware.

                  FOURTH: That the capital of the Corporation will not be
reduced under or by reason of said amendments.

                  IN WITNESS WHEREOF, Westlake Vinyl Corporation has caused this
certificate to be signed by its Executive Vice President and attested by its
Secretary, this 31st day of October, 1993.

                                             WESTLAKE VINYL CORPORATION

                                             By:     /s/ A. Chao
                                                 -------------------------------
                                                     Albert Chao
                                                     Executive Vice President

ATTEST:

By:     /s/ Michael A. Robison
   --------------------------------
        Michael A. Robison
        Secretary