High temperature gasket
AssigneeMinnesota Mining and Manufacturing Company
InventorsJames R. Close, Lance W. Pihlstrom
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Abstract
Gasketing material is produced by combining a tubular casing of braided or woven from continuous inorganic filaments, such as alumina-boria-silica fibers, with a core composition comprising a major proportions of intumescent material, suitably unexpanded vermiculite. Heating the gasket in situ results in expansion to give a resilient gasket stable to temperatures of about 1000.degree. to 1200.degree. C.
Claims6
A composite gasketing material comprising, in combination, outer sheathing means of continuous inorganic filaments and having cross-sectionally a central free space, equilong intumescent core means within said sheathing means at least partially filling said central free space of said sheathing means and expandable to fill said free space of said sheathing means, said intumescent core means being a composition comprising, in percentages by weight of dry material, about 30 to about 80% of an expandable inorganic fibrous material, about 5 to about 60% inorganic reinforcing agents, 0 to about 55% of fillers and about 10 to about 70% of organic and inorganic binders in combination in ratios of 1:2 to 5:1.
Dependencies are inferred from the claim text.