초록 ▼

Increased fire resistant gypsum board core formulations and plaster fireproofing formulations are provided by incorporating calcium sulfate anhydrite into the formulations. Particularly fire resistant effects are achieved with a fibrous form of calcium sulfate anhydrite, and with blends of calcium s

Increased fire resistant gypsum board core formulations and plaster fireproofing formulations are provided by incorporating calcium sulfate anhydrite into the formulations. Particularly fire resistant effects are achieved with a fibrous form of calcium sulfate anhydrite, and with blends of calcium sulfate anhydrite II in particulate or fibrous form. Optionally, the formulations may contain either small amounts of textile glass fiber, wollastonite or vermiculite.

대표청구항 ▼

An improved fire resistant gypsum board of the type having a monolithic core of set gypsum and, to offset the shrinkage of the board core during fire heat exposure, minor amounts of fiber reinforcement and of unexpanded vermiculite; the improvement characterized in providing at least one hour fire r

An improved fire resistant gypsum board of the type having a monolithic core of set gypsum and, to offset the shrinkage of the board core during fire heat exposure, minor amounts of fiber reinforcement and of unexpanded vermiculite; the improvement characterized in providing at least one hour fire resistance by laboratory test by replacing at least a portion of the unexpanded vermiculite with an amount of uncured insoluble calcium sulfate anhydrite II without the presence of other curing agents, effective to maintain integrity of the board and inhibit thermal shrinkage of the board when exposed to the heat of a test fire.