Mykrolis (MYK) 10-Q 2003 Q1 Quarterly report

Exhibit 99.2

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 Mykrolis Corporation (the “Company”) on Form 10–Q for the period ending March 29, 2003 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Bertrand Loy, Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. ss. 1350, as adopted pursuant to §906 of the Sarbanes–Oxley Act of 2002, that:

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

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

/s/    Bertrand Loy                                             

Bertrand Loy

Vice President and Chief Financial Officer

May 13, 2003