Exhibit 99(a)(9)



                        CERTAINTEED CORPORATION EXTENDS
               BRUNSWICK TECHNOLOGIES TENDER OFFER THROUGH MAY 18


Valley Forge, PA, April 24, 2000 - CertainTeed Corporation, a wholly owned
subsidiary of Compagnie de Saint-Gobain (Paris, France), today announced that it
has extended its tender offer for all of the outstanding shares, including the
associated rights to purchase preferred stock, of Brunswick Technologies, Inc.
(Nasdaq: BTIC) at a price of $8.00 per share, in cash.  The offer, which was
scheduled to expire at midnight on May 17, 2000, has been extended through
midnight, New York City time, on May 18, 2000.

Lehman Brothers Inc. is financial advisor to CertainTeed Corporation and
Compagnie de Saint-Gobain and Dealer Manager for the offer, and Innisfree M&A
Incorporated is acting as Information Agent for the offer.

CertainTeed Corporation is a leading manufacturer of roofing; vinyl and fiber
cement siding; vinyl windows; vinyl fencing, deck and railing; ventilation
products; piping products; fiber glass insulation; and fiber glass products for
reinforcing plastics and other materials.  The company is headquartered in
Valley Forge, Pennsylvania, and has more than 7,000 employees and 45
manufacturing facilities throughout the United States.

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This release may contain some forward-looking statements.  The Company
undertakes no obligation to publicly update any forward-looking statements,
whether as a result of new information, future events or otherwise.

CONTACTS:

Joele Frank / Josh Silverman
Joele Frank, Wilkinson Brimmer Katcher
212-355-4449  ext. 110/121