EXHIBIT 1

FOR IMMEDIATE RELEASE


         MYKROLIS CORPORATION ANNOUNCES RECORD AND DISTRIBUTION DATES
        FOR DISTRIBUTION OF COMMON STOCK OWNED BY MILLIPORE CORPORATION

Bedford, Massachusetts -- January 28, 2002 - Mykrolis Corporation (NYSE: MYK), a
leading supplier to the semiconductor industry, today announced that Millipore
Corporation's (NYSE: MIL) Board of Directors has declared a stock dividend of
all of the shares of common stock of Mykrolis owned by Millipore. The dividend
will be distributed on February 27, 2002, to Millipore stockholders of record as
of 5:00 p.m. Eastern time on February 13, 2002.

Millipore currently owns 32,500,000 shares of Mykrolis common stock, which
represents approximately 82.3 percent of the total outstanding common stock of
Mykrolis. This distribution is the final phase in the separation and spin-off of
Mykrolis from Millipore. Mykrolis conducted an IPO on August 9, 2001 during
which 17.7 percent of the outstanding common stock was sold.

THE DIVIDEND DISTRIBUTION

The Mykrolis common stock owned by Millipore will be distributed to Millipore
stockholders in the amount of approximately 0.6776 of a share of Mykrolis common
stock for each share of Millipore common stock (approximately 68 shares of
Mykrolis common stock for each 100 shares of Millipore common stock). The final
ratio will be the number of shares of Mykrolis common stock owned by Millipore
to the actual number of shares of Millipore common stock outstanding on February
13, 2002, the record date.

As previously announced by Millipore, the Internal Revenue Service ruled that
the distribution to Millipore stockholders of the Mykrolis common stock would be
tax free to Millipore stockholders for U.S. federal income tax purposes. The
distribution remains subject to the conditions set forth in the Master
Separation and Distribution Agreement previously entered into between Millipore
and Mykrolis.


FURTHER INFORMATION ON THE DISTRIBUTION

After the record date of February 13, 2002, Millipore will mail an information
statement to its stockholders of record as of 5:00 p.m. Eastern time on the
record date. The information statement will include the final ratio of shares of
Mykrolis common stock to be distributed for each share of Millipore common
stock, as well as information as to how to calculate the per share cost basis of
such shares.

ABOUT MYKROLIS

Mykrolis, based in Bedford, Massachusetts, is a global supplier of advanced
process solutions for gas and liquid filters and delivery systems for the
semiconductor, flat panel, fiber optic and optical disc industries. Information
about Mykrolis is available at www.mykrolis.com.

ABOUT MILLIPORE

Millipore is a multinational, high technology company that provides
technologies, tools and services for the development and production of new
therapeutic drugs. It serves the life science research, biotechnology and
pharmaceutical industries. For more information about Millipore visit
www.millipore.com.

FORWARD LOOKING STATEMENT DISCLAIMER

The matters discussed herein, as well as in future oral and written statements
by management of Mykrolis Corporation that are forward-looking statements, are
based on current management expectations that involve substantial risks and
uncertainties which could cause actual results to differ materially from the
results expressed in, or implied by, these forward-looking statements. When used
herein or in such statements, the words "anticipate", "believe", "estimate",
"expect", "may", "will", "should" or the negative thereof and similar
expressions as they relate to Mykrolis or its management are intended to
identify such forward-looking statements. Potential risks and uncertainties that
could affect Mykrolis' future operating results include, without limitation,
those risks described under the heading "Risk Factors" in the Mykrolis
Corporation Form S-1 Registration


Statement, dated August 9, 2001 and under Item 2, Management's Discussion and
Analysis of Results of Operations and Financial Condition of the Mykrolis
Corporation Form 10-Q report for the quarter ended September 30, 2001.

                                     # # #


Contact:  Mykrolis Corporation         Ogilvy Public Relations Worldwide
          Barbara Russo                Sergio Prosperino (Investors)
          Corporate Communications     (212) 884-4069
          (781) 533-2980               Sergio.Prosperino@ogilvypr.com
          Barbara_Russo@mykrolis.com