| Abstract |
A multi-layer gypsum board having face sheets comprising inorganic fiber randomly oriented glass fiber, completely impregnated with gypsum slurry penetrates through the random interstices between the inorganic fibers and coats the board surfaces with gypsum slurry. The multi-layer gypsum board may have a polymeric compounded added to unset gypsum, where the compound may comprise one of the following; plyacrylamide, polymethylacrylamide, polyvinyidene chloride, polyamide, poly(hexamethylene adipamide), polyvinylchloride, polyethylene, cellulose acetate, polyisobutylene, polycarbonate, polypropylene, polystyrene, polychloroprene, styrene, butadiene, natural rubber, poly(2,6 dimethyl pentene oxide), poly(4-methyl-1-pentene) and polydimethyl siloxane. The multi-layer gypsum board may comprise a first layer of a mixture of polymeric compound additive and set gypsum having an outer surface and being impregnated in a thin sheet of randomly aligned inorganic fibers so as to encase the core gypsum within two facing layers having a combination of set gypsum and polymeric compound. |