Exhibit 99.1

                            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 Stepan Company (the "Company") on
Form 10-Q for the period ended June 30, 2002, as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), each of the undersigned
officers of the Company certifies, pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to such
officer's knowledge:

     (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: August 13, 2002


                                         /s/ F. Quinn Stepan
                                         Name: F. Quinn Stepan
                                         Title: Chief Executive Officer


                                         /s/ James E. Hurlbutt
                                         Name: James E. Hurlbutt
                                         Title: Vice President and Corporate
                                                Controller