Exhibit 32.2

                          CERTIFICATION PURSUANT TO
                           18 U.S.C. SECTION 1350,
                           AS ADOPTED PURSUANT TO
                SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Zoltek Companies, Inc. (the
"Company") on Form 10-Q/A for the period ending June 30, 2004 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
Kevin Schott, Chief Financial Officer of the Company, certify, pursuant to
18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, to the best of my knowledge and belief, that:

        (1) The Report fully complies with the requirements of section 13(a)
            or 15(d) of the Securities Exchange Act of 1934; and

        (2) The information contained in the Report fairly presents, in all
            material respects, the financial condition and results of
            operations of the Company.

Date: December 16, 2005                       By:      /s/ KEVIN SCHOTT
      -----------------                          ---------------------------
                                                         Kevin Schott
                                                   Chief Financial Officer