Fire-resistant gypsum board

Details Fire-resistant gypsum board Fire-resistant gypsum board

1983-12-01

1986-01-14

Lesmes, George F.

Stock material or miscellaneous articles

Sheet including cover or casing

Encased layer derived from inorganic settable ingredient

428703, 4285371, 428920, 428921, B32B 104, B32B 518, B32B 1304, B32B 3100

Patent

active

045645442

ABSTRACT:
A fire-retardant gypsum wallboard having, in the gypsum core, about 2% by weight of a feldspar-free muscovite, in combination with other minor additives including 1/2 inch long glass fibers.

REFERENCES:
patent: 2136877 (1938-11-01), Delpech et al.
patent: 2970127 (1961-01-01), Slayter et al.
patent: 3189511 (1965-06-01), White
patent: 3376147 (1968-02-01), Dean
patent: 4238546 (1980-12-01), Phillips
patent: 4403006 (1983-09-01), Bruce et al.

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