EXHIBIT 32(a)
                                                                   -------------

                            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 Harsco Corporation (the "Company") on
Form 10-Q for the period ending March 31, 2006 as filed with the Securities and
Exchange Commission on the date hereof (the "Report"), I, Derek C. Hathaway,
Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. ss. 1350,
as adopted pursuant to ss. 906 of the Sarbanes-Oxley Act of 2002, that to the
best of my 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.




/s/ Derek C. Hathaway
---------------------------
Derek C. Hathaway
Chief Executive Officer

May 8, 2006