THERMATRIX INC
8-A12G, 1996-06-05
GENERAL INDUSTRIAL MACHINERY & EQUIPMENT, NEC
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<PAGE>
 
                                   FORM 8-A

                      SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C. 20549
                            ----------------------

               FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                    PURSUANT TO SECTION 12(b) OR (g) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

                                THERMATRIX INC.
- --------------------------------------------------------------------------------
            (Exact name of Registrant as specified in its charter)

               Delaware                                          94-2958515
- --------------------------------------------------------------------------------
        (State of incorporation                               (I.R.S. Employer
           or organization)                                  Identification No.)

101 Metro Drive, Suite 248, San Jose, CA                            95110
- --------------------------------------------------------------------------------
(Address of principal executive offices)                          (Zip Code)


Securities to be registered pursuant to Section 12(b) of the Act:

                                     NONE
- --------------------------------------------------------------------------------

Securities to be registered pursuant to Section 12(g) of the Act:

                        COMMON STOCK, $0.001 PAR VALUE
- -------------------------------------------------------------------------------
                               (Title of Class)

<PAGE>
 
Item 1.     Description of Registrant's Securities to be Registered
            -------------------------------------------------------

            Incorporated by reference to page 44 of the Preliminary Prospectus 
            contained in Registrant's Registration Statement on Form S-1 filed
            with the Securities and Exchange Commission on May 3, 1996 (the 
            "1933 Act Registration Statement").

Item 2.     Exhibits
            --------

            The following exhibits are filed as a part of this registration

            1.*  Form of specimen certificate for Registrant's Common Stock.

            2.*  Amended and Restated Certificate of Incorporation of 
                 Registrant.
 
            3.*  Bylaws of Registrant.

- ------------
* Incorporated by reference to Exhibits of the Registration Statement.

<PAGE>
 
                                   SIGNATURE

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 
1934, the Registrant has duly caused this registration statement to be signed on
its behalf by the undersigned, thereto duly authorized.

Date: May 14, 1996                     THERMATRIX INC.


                                       By: /s/ Barbara E. Krimsky
                                           ----------------------
                                           Barbara E. Krimsky
                                           Secretary



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