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US 4,128,434 AGranted
High density asbestos-free tobermorite thermal insulation containing wollastonite
AssigneeJohns Manville
InventorWalter G. Pusch
Life of this patent
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Abstract
A high density thermal insulation material is described, consisting essentially of 15 to 40 parts lime, 20 to 40 parts silica or other silicious material, 15 to 40 parts wollastonite, all slurried in water, then compressed to a shape retaining body of at least 20 pcf density and indurated to form an asbestos-free, wollastonite-reinforced, tobermorite calcium silicate hydrate matrix thermal insulation.
Claims10
A high density asbestos-free thermal insulation body formed by slurrying a mixture consisting essentially of, in parts by weight:
- 15 to 40 parts lime, 20 to 40 parts by weight of a siliceous component, and 15 to 40 parts by weight wollastonite, said mixture containing no asbestos fiber, in at least one part by weight water per part by weight of dry solids in said mixture;
- molding the slurry to a shape-retaining body having a density of at least 20 pcf;
- and thereafter curing said molded body in an atmosphere of steam at elevated pressure for a sufficient time to cause the lime, siliceous component, and water to form a calcium silicate hydrate matrix consisting essentially of tobermorite crystalline phase and reinforced by said wollastonite.
Dependencies are inferred from the claim text.