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

I,  Gordon D.  Harnett,  President,  Chairman  of the Board and Chief  Executive
Officer of Brush Engineered Materials Inc. (the "Company"),  do hereby certify
in accordance  with 18 U.S.C.  1350,  as adopted  pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that, to my knowledge,

1. The Quarterly  Report on Form 10-Q of the Company for the period ending March
   28, 2003 (the "Periodic  Report")  fully complies with the  requirements of
   Section 13(a) or 15(d) of the Securities  Exchange Act of 1934 (15 U.S.C. 78m
   or 78o(d)), and

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

Dated: May 8, 2003                  /s/ Gordon D. Harnett
                                    --------------------------------
                                    Gordon D. Harnett
                                    President, Chairman of the Board
                                    and Chief Executive Officer