Porous polytetrafluoroethylene film and process for preparation thereof
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United States of America Patent
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Jun 30, 1998
Grant Date -
N/A
app pub date -
Dec 22, 1994
filing date -
Jan 25, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
A porous polytetrafluoroethylene film which is excellent as an air filter used in clean rooms in a semiconductor industry, which is suitable for the collection of microparticles floating in a gas such as air and exhibits a low pressure drop is provided. The film has an average pore size of from 0.2 to 0.4 .mu.m and exhibits a pressure drop of from 20 to 50 mmH.sub.2 O when air is passed through it at a flow rate of 5.3 cm/sec. The film is prepared by stretching biaxially unsintered polytetrafluoroethylene at specific temperatures.
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