Entegris (ENTG) 10-Q 2006 Q1 Quarterly report

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 Report on Form 10-Q (the “Report”) of Entegris, Inc, a Minnesota corporation (the “Company”), for the period ended April 1, 2006 as filed with the Securities and Exchange Commission on the date hereof, I, John D. Villas, Chief Financial Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 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

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

Date: May 11, 2006

/s/ John D. Villas

John D. Villas

Chief Financial Officer