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A coherent, rigid, heat stable, low density, low thermal conductivity, strong, impact resistant, water repellant thermal insulation material, having an average maximum linear shrinkage of 2% or less at temperatures up to 1200°F., made from expanded perlite, alkali metal silicate solution, kaolin cla

A coherent, rigid, heat stable, low density, low thermal conductivity, strong, impact resistant, water repellant thermal insulation material, having an average maximum linear shrinkage of 2% or less at temperatures up to 1200°F., made from expanded perlite, alkali metal silicate solution, kaolin clay, and organic fiber. Additions of methylcellulose and polydimethyl silicone liquid enhance the insulation material\s strength and water repellency characteristics. The material may be cured and dried at a temperature of about 170°or less for a period of about 24 hours or more without humidity control.

대표청구항 ▼

A thermal insulation material having an average maximum linear shrinkage of 2% or less at temperatures up to 1200°F. made by the process of: (a) mixing expanded perlite, alkali metal silicate, water, up to 15 parts by weight of kaolin clay per 100 parts by weight of expanded perlite and up to 2 part

A thermal insulation material having an average maximum linear shrinkage of 2% or less at temperatures up to 1200°F. made by the process of: (a) mixing expanded perlite, alkali metal silicate, water, up to 15 parts by weight of kaolin clay per 100 parts by weight of expanded perlite and up to 2 parts by weight of an organic fiber per 100 parts by weight of expanded perlite to form a mixture, the alkali metal silicate and water content of said mixture being between 60% and 140% by weight of the expanded perlite content of said mixture; (b) pressing said mixture in a suitable mold to form a molded article; and (c) curing and drying said molded article at a temperature of between about 140°F. and about 170°F.