Exhibit 31.1



CERTIFICATIONS*



I, C. William Zadel, certify that:



| | (1) |  | I have reviewed this Annual Report on Form 10-K for the year ended December 31, 2003 of Mykrolis Corporation;
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| | (2) |  | 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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| | (3) |  | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of
operations and cash flows of the registrant as of, and for, the periods presented in this report;
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| | (4) |  | The registrants other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules
13a-15(e) and 15d-15(e)) [language deleted pursuant to Exchange Act Release No. 34-47986] for the registrant and have:
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(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;



(b) [DELETED pursuant to Exchange Act Release
No. 34-47986];



(c) Evaluated the
effectiveness of the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on
such evaluation; and



(d) Disclosed in this
report any change in the registrants internal control over financial reporting that occurred during the registrants most recent fiscal quarter (the registrants fourth fiscal quarter in the case of an annual report) that has
materially affected, or is reasonably likely to materially affect, the registrants internal control over financial reporting; and



| | (5) |  | The registrants other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrants
auditors and the audit committee of the registrants board of directors (or persons performing the equivalent functions):
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(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
reasonably likely to adversely affect the registrants ability to record, process, summarize and report financial information; and



(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants
internal control over financial reporting.



Date: March 15, 2004



/s/ C. William
Zadel

C. William
Zadel

Chairman of the Board and Chief Executive Officer