- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                           ------------------------

                                  SCHEDULE TO
                     TENDER OFFER STATEMENT UNDER SECTION
          14(d)(1) OR 13(e)(1)OF THE SECURITIES EXCHANGE ACT OF 1934

                               (Amendment No. 10)
                             ---------------------

                         BRUNSWICK TECHNOLOGIES, INC.

                           (Name of Subject Company)
                           ------------------------

                          VA ACQUISITION CORPORATION

                            CERTAINTEED CORPORATION

                     Indirect wholly owned subsidiaries of

                           COMPAGNIE DE SAINT-GOBAIN

                       (Name of Filing Person--Offeror)

                           ------------------------

                   COMMON STOCK, PAR VALUE $0.0001 PER SHARE
                        (Title of Class of Securities)

                                 117394  10  6
                     (CUSIP Number of Class of Securities)
                           ------------------------

                                JOHN R. MESHER
                        VICE PRESIDENT, GENERAL COUNSEL
                                 AND SECRETARY
                            CERTAINTEED CORPORATION
                            750 E. SWEDESFORD ROAD
                       VALLEY FORGE, PENNSYLVANIA  19482
                           TELEPHONE: (610) 341-7108
           (Name, Address and Telephone Number of Person Authorized
      to Receive Notices and Communications on Behalf of Filing Persons)
                           ------------------------

                                   COPY TO:
                             PETER O. CLAUSS, ESQ.
                              PEPPER HAMILTON LLP
                             3000 TWO LOGAN SQUARE
                          EIGHTEENTH AND ARCH STREETS
                    PHILADELPHIA, PENNSYLVANIA  19103-2799
                           TELEPHONE: (215)981-4541
                           ------------------------



                           CALCULATION OF FILING FEE


________________________________________________________________________________
     TRANSACTION VALUATION*              AMOUNT OF FILING FEE
________________________________________________________________________________
________________________________________________________________________________

     $40,735,280                                 $8,147
________________________________________________________________________________

*    Based on the offer to purchase, all of the outstanding shares of common
stock of Brunswick Technologies, Inc. at a purchase price of $8.00 cash per
share, 5,230,830 shares issued and outstanding as of March 15, 2000, less
713,746 shares owned by an affiliate of Offeror, and outstanding options with
respect to 574,826 shares as of December 31, 1999 with an exercise price of
$10.00 or less per share, in each case as reported in Brunswick Technologies,
Inc.'s Annual Report on Form 10-K for the calendar year ended December 31, 1999.

[x] Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
and identify the filing with which the offsetting fee was previously paid.
Identify the previous filing by registration statement number, or the Form or
Schedule and the date of its filing.

Amount Previously Paid:  $8,147
Form or Registration No.: Schedule TO
Filing Party:  VA Acquisition Corporation, CertainTeed Corporation
Date Filed:  April 20, 2000

[ ] Check the box if the filing relates solely to preliminary communications
made before the commencement of a tender offer.

Check the appropriate boxes below to designate any transactions to which the
statement relates:

[x] third party tender offer subject to Rule 14d-1.
[ ] issuer tender offer subject to Rule 13e-4.
[ ] going-private transaction subject to Rule 13e-3.

[x] amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results
of the tender offer: [ ]

                                       2


     This Amendment No. 10 (this "Amendment") amends and supplements the Tender
Offer Statement on Schedule TO filed with the Securities and Exchange Commission
on April 20, 2000, as amended by Amendment No. 1, by Amendment No. 2, by
Amendment No. 3, by Amendment No. 4, by Amendment No. 5, by Amendment No. 6, by
Amendment No. 7, by Amendment No. 8 and by Amendment No. 9 thereto filed with
the Commission on April 24, 2000, April 26, 2000, April 28, 2000, May 2, 2000,
May 2, 2000, May 3, 2000, May 4, 2000, May 5, 2000 and May 8, 2000, respectively
(collectively, the "Schedule TO") by CertainTeed Corporation, a Delaware
corporation ("CertainTeed" or the "Parent"), and VA Acquisition Corporation, a
Maine corporation and an indirect wholly owned subsidiary of CertainTeed (the
"Purchaser"), both of which are indirect wholly owned subsidiaries of Compagnie
de Saint-Gobain. The Schedule TO relates to the offer by the Purchaser to
purchase all outstanding shares of common stock, par value $0.0001 per share,
including the associated rights to purchase preferred stock (the "Shares"), of
Brunswick Technologies, Inc., a Maine corporation ("BTI" or the "Company"), at
$8.00 per Share, net to the seller in cash, upon the terms and subject to the
conditions set forth in the Offer to Purchase, dated April 20, 2000 (the "Offer
to Purchase"), and in the related Letter of Transmittal, copies of which are
attached as Exhibits (a)(1) and (a)(2), respectively, to the Schedule TO.
Capitalized terms used and not defined herein shall have the meanings ascribed
to such terms in the Offer to Purchase and in the Schedule TO.

This Amendment No. 10 to Schedule TO also constitutes Amendment No. 10 to the
statement on Schedule 13D of Parent, Saint-Gobain and Vetrotex, filed on
February 18, 1997.

ITEM 11. ADDITIONAL INFORMATION.

     Item 11 of the Schedule TO is hereby amended and supplemented to include
the following information:

     The waiting period under the Hart-Scott-Rodino Antitrust Improvements Act
of 1976 during which the federal government could request additional information
with respect to the proposed acquisition of BTI expired as of midnight New York
City time on May 10, 2000. Accordingly, Purchaser and Parent believe this
particular condition to the Offer has been satisfied.

ITEM 12.   MATERIALS TO BE FILED AS EXHIBITS.

     Item 12 of the Schedule TO is hereby amended and supplemented to include
the following information:

     (a)(16) Text of press release issued by CertainTeed, dated May 11, 2000.


                                       3



                                   SIGNATURE

     After due inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

    Dated: May 11, 2000


                                    VA Acquisition Corporation



                                    By: /s/ John R. Mesher
                                        ------------------
                                         John R. Mesher
                                         Vice President and Secretary

                                    CertainTeed Corporation



                                    By: /s/ John R. Mesher
                                        ------------------
                                         John R. Mesher
                                         Vice President, General Counsel
                                         and Secretary

                                       4


                                 EXHIBIT INDEX



(a)(1)  Offer to Purchase, dated April 20, 2000.*

(a)(2)  Form of Letter of Transmittal.*

(a)(3)  Form of Notice of Guaranteed Delivery.*

(a)(4)  Form of Letter to Brokers, Dealers, Commercial Banks, Trust Companies
        and Other Nominees.*

(a)(5)  Form of Letter to Clients for use by Brokers, Dealers, Commercial
        Banks, Trust Companies and Other Nominees.*

(a)(6)  Guidelines for Certification of Taxpayer Identification Number on
        Substitute Form W-9.*

(a)(7)  Form of summary advertisement, dated April 20, 2000.*

(a)(8)  Text of press release issued by CertainTeed, dated April 20, 2000.*


(a)(9)  Text of press release issued by CertainTeed, dated April 24, 2000.*

(a)(10) Text of press release issued by CertainTeed, dated April 26, 2000.*

(a)(11) Text of letter to shareholders of Brunswick Technologies, Inc. dated May
        2, 2000.*

(a)(12) Text of press release issued by CertainTeed, dated May 2, 2000.*

(a)(13) Text of press release issued by CertainTeed, dated May 3, 2000.*

(a)(14) Text of newspaper advertisement issued by CertainTeed and published on
        May 4, 2000 in the Portland Press Herald and Brunswick Times Record.*

(a)(15) Text of press release and open letter to the directors of Brunswick
        Technologies, Inc. issued by CertainTeed, dated May 8, 2000.*

(a)(16) Text of press release issued by CertainTeed, dated May 11, 2000.

(d)     None.

(g)     None.

(h)     Not applicable.
___________________________

*  Previously filed as exhibits to Schedule TO.


                                       5