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I have reviewed this Annual Report on Form 10-K/A of CMC Materials, Inc.; and
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Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by this report.
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Date: January 19, 2022
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/s/ Jeanette A. Press
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Jeanette A. Press
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Interim Chief Financial Officer and Principal Accounting Officer
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