Open-cell foamed gypsum insulation

Details Open-cell foamed gypsum insulation Open-cell foamed gypsum insulation

1987-09-04

1989-02-14

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 65, 521 68, 521 83, 521100, 524 2, 524423, 524650, C08Q 1814

Patent

active

048046884

ABSTRACT:
An aqueous slurry of gypsum plaster is stabilized by an organic, polymeric, hydrophilic stabilizer for more than 30 days without setting.
Upon activation with a Lewis acid the slurry becomes hydrated. The plaster form or the hydrated form may be employed to impregnate a substrate to form insulating sheeting. The substrate may be fabric, felt, paper, nonwoven, or sponge.
Open-cell, foamed gypsum may be used alone or molded to shaped articles such as bricks for a firewall.

REFERENCES:
patent: 2902998 (1959-09-01), Durandeaux
patent: 3525685 (1970-09-01), Foster et al.
patent: 3563777 (1971-02-01), Pratt et al.
patent: 3719513 (1973-03-01), Bragg et al.
patent: 3758319 (1973-09-01), Ergesse
patent: 3839059 (1974-10-01), Rothfelder et al.
patent: 3926650 (1975-12-01), Lange et al.
patent: 3974024 (1976-08-01), Yamo et al.
patent: 4084980 (1978-04-01), Motoki
patent: 4133638 (1979-01-01), Healey
patent: 4229223 (1980-10-01), Flake
patent: 4240839 (1980-12-01), Crespeau et al.
patent: 4265964 (1981-05-01), Burkhart

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