Asbestos-free sheet material for spiral-wound gaskets
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United States of America Patent
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Jul 16, 1985
Grant Date -
N/A
app pub date -
Nov 10, 1983
filing date -
Nov 20, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Non-asbestos flexible sheet material suitable for use in the manufacture of spiral wound gaskets is made by dewatering on a water-permeable conveyor a layer of aqueous slurry and compressing and drying the dewatered layer, the aqueous slurry employed being one that contains the following ingredients in the following proportions by dry weight: china clay 20-50% mica or chlorite 20-50% graphite 10-40% cellulose fibres 2-10% vitreous fibre in wool form 2-10% synthetic organic polymer binder 2-10%.
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