Claims
- 1. Gasket material having improved compression recovery characteristics under elevated temperature conditions formed of felt material comprising polyethylene terephthalate fibers which have been heated at a temperature of about 160.degree.-200.degree. C. for at least 30 minutes to appreciably increase the compression recovery thereof.
- 2. Gasket material as defined in claim 1, said fiber material comprising polyethylene terephthalate being intermingled with second fiber material comprising a carbonized organic material.
- 3. Gasket material as defined in claim 2, said second fiber material comprising a phenol-formaldehyde polymer, said temperature is about 190.degree. C. and said time is at least 1 hour.
Parent Case Info
This a division of application Ser. No. 463,898 filed Apr. 25, 1974, now U.S. Pat. No. 4,059,753, and assigned to the same assignee as the present invention.
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
Country |
Parent |
463898 |
Apr 1974 |
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