Sag-resistant gypsum board containing coal fly ash and method fo

Details Sag-resistant gypsum board containing coal fly ash and method fo Sag-resistant gypsum board containing coal fly ash and method fo

1980-03-13

1983-09-06

Van Balen, William J.

Stock material or miscellaneous articles

Sheet including cover or casing

Encased layer derived from inorganic settable ingredient

156 39, 428 71, 4283124, 4283179, 428703, B32B 104, B32B 518, B32B 1304, B32B 3100

Patent

active

044030061

ABSTRACT:
A gypsum board consisting essentially of a monolithic cellular core of set gypsum and a fiberous cover sheet encasement provided with improved properties by the gypsum core having incorporated therein coal fly ash in an amount of about 1-20% by weight of stucco in the gypsum slurry used in forming the board and method of producing the board are disclosed.

REFERENCES:
patent: 2731377 (1956-01-01), Piddell et al.
patent: 3616173 (1971-10-01), Green et al.
patent: 3854968 (1974-12-01), Mirnick et al.
patent: 4081283 (1978-03-01), Farland et al.
patent: 4087285 (1978-05-01), Kurz
patent: 4164526 (1979-08-01), Clay et al.
patent: 4238546 (1980-12-01), Phillips
patent: 4240952 (1980-12-01), Hulbert, Jr. et al.

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