The Sarbanes - Oxley Act of 2002 (the Act) requires that Entegris' Chief Executive Officer (CEO) and Chief Financial Officer (CFO) provide certifications pursuant to Sections 302 and 906 of the Act in its periodic financial reports (Forms 10-Q and 10-K). These certifications can be located as described below:

The Section 302 Certifications of its CEO are included in the Company's10Q and 10K filings as Exhibit 31.1 to such filings.

The Section 302 Certifications of its CFO are included in the Company's 10Q and 10K filings as Exhibit 31.2 to such filings.

The Section 906 Certifications of its CEO are included in the Company's 10Q and 10K filings as Exhibit 32.1 to such filings.

The Section 906 Certifications of its CFO are included in the Company's 10Q and 10K filings as Exhibit 32.2 to such filings.

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