Porous PTFE structures
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United States of America Patent
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Oct 14, 1997
Grant Date -
N/A
app pub date -
May 2, 1995
filing date -
Mar 31, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A porous polytetrafluoroethylene (PTFE) structure particularly for use as a liquid filter comprises particles of granular-type PTFE fused together to form a porous integral network. The structure is formed by spraying an aqueous suspension of granular PTFE particles and baking at a temperature of 335.degree.-350.degree. C. Typically the specific gravity is 0.8 to 1.54. The crystallinity is less than 95%. The structure may be supported on a perforate substrate such as stainless steel mesh.
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