JOINT FILING AGREEMENT
EXHIBIT 4
Each of the undersigned hereby agrees that the Statement on Schedule 13D, dated November 10,
2009 (the “Schedule 13D”), with respect to the common stock of GenTek Inc. is, and any
amendments thereto shall be, filed on behalf of each of the undersigned pursuant to and in
accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as
amended, and that this Agreement shall be included as an exhibit to the Schedule 13D and each such
amendment. Each of the undersigned agrees to be responsible for the timely filing of the Schedule
13D and any amendments thereto, and for the completeness and accuracy of the information concerning
itself contained therein, but shall not be responsible for the completeness and accuracy of the
information concerning any other party, except to the extent that it knows or has reason to believe
that such information is inaccurate. This Agreement may be executed in any number of counterparts,
all of which taken together shall constitute one and the same instrument.
IN WITNESS WHEREOF, each of the undersigned has executed this Agreement as of the dates
written below.
GENTEK INC., as successor in interest to ASP GT ACQUISITION CORP. |
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By: | /s/ Xxxx X. Xxxxxxxxx | |||
Name: | Xxxx X. Xxxxxxxxx | |||
Title: | Vice President | |||
Date: | November 10, 2009 | |||
ASP GT HOLDING CORP. |
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By: | /s/ Xxxx X. Xxxxxxxxx | |||
Name: | Xxxx X. Xxxxxxxxx | |||
Title: | Vice President | |||
Date: | November 10, 2009 | |||
AMERICAN SECURITIES PARTNERS V, L.P. |
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By: | American Securities Associates V, LLC, its general partner | |||
By: | /s/ Xxxxxxx X. Xxxxx | |||
Name: | Xxxxxxx X. Xxxxx | |||
Title: | Managing Member | |||
Date: | November 10, 2009 | |||
AMERICAN SECURITIES PARTNERS V(B), L.P. |
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By: | American Securities Associates V, LLC, its general partner | |||
By: | /s/ Xxxxxxx X. Xxxxx | |||
Name: | Xxxxxxx X. Xxxxx | |||
Title: | Managing Member | |||
Date: | November 10, 2009 |
AMERICAN SECURITIES PARTNERS V(C), L.P. |
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By: | American Securities Associates V, LLC, its general partner | |||
By: | /s/ Xxxxxxx X. Xxxxx | |||
Name: | Xxxxxxx X. Xxxxx | |||
Title: | Managing Member | |||
Date: | November 10, 2009 | |||
AMERICAN SECURITIES ASSOCIATES V, LLC |
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By: | /s/ Xxxxxxx X. Xxxxx | |||
Name: | Xxxxxxx X. Xxxxx | |||
Title: | Managing Member | |||
Date: | November 10, 2009 | |||
AMERICAN SECURITIES LLC |
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By: | /s/ Xxxx X. Xxxxxxxxx | |||
Name: | Xxxx X. Xxxxxxxxx | |||
Title: | General Counsel | |||
Date: | November 10, 2009 | |||