Composite Sheet and Production Method Thereof
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United States of America Patent
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Issued Date -
Jul 5, 2012
app pub date -
Dec 22, 2009
filing date -
Dec 24, 2008
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Abstract
It is an objective of the present invention to provide a composite sheet and a production method thereof, which composite sheet has excellent sealing ability, since the sheet exhibits high compressibility and yet low stress relaxation, as well as high strength and excellent pressure resistance. The objective of the present invention is also to provide a sheet gasket having the above-mentioned properties. The composite sheet according to present invention is characterized in that pores of an expanded porous PTFE sheet are filled with silica gel; and a ratio of remaining pores is not less than 5% and not more than 50%.
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