Rigid sheet polytetrafluoroethylene gasket

Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...

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428 664, 4283044, 4283155, 4283159, 4283166, 4283179, 4283193, 4283197, 428323, 428421, 428422, 277650, 277651, 277652, 277654, 277936, 277945, 277946, B32B 518, B32B 530, B32B 532, B32B 702

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058797890

ABSTRACT:
An improved, chemically resistant gasket is constructed from a composite containing outer layers consisting essentially of conformable expanded polytetrafluoroethylene (PTFE) and interior layers consisting essentially of a densified expanded PTFE, wherein the composite layers may optionally contain electrically conductive fillers. The composite is bonded together to form a sheet material that is sufficiently conformable to provide good seal between surfaces and is sufficiently rigid to make the material easy to handle and install. The material of the present invention is particularly suitable for use as a gasket where rigidity is needed, customization or modification of gasket shape is desirable, and/or where a wide, even sealing surface is sought.

REFERENCES:
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patent: 4147824 (1979-04-01), Dettmann et al.
patent: 4547424 (1985-10-01), Suzuki
patent: 4576861 (1986-03-01), Kato
patent: 4900629 (1990-02-01), Pitolaj
patent: 5128209 (1992-07-01), Sakai et al.
patent: 5217797 (1993-06-01), Knox et al.
patent: 5286568 (1994-02-01), Bacino et al.
patent: 5431974 (1995-07-01), Pierce
"Industrial Sealants GORE-TEX GR(R) Sheet Gasketing," W. L. Gore & Assoc., Inc. 1995.
"GORE-TEX(R) Insertable Gaskets," W. L. Gore & Associates Inc., 1993.
"GORE-TEX(R) Tape," W. L. Gore & Associates, Inc. 1993.
"Sealant Technologies," W. L. Gore & Assoc. Inc.(5 product Sheets), 1989.

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