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US 10,245,755 B2Granted
Lightweight, reduced density fire rated gypsum panels
AssigneeUnited States Gypsum Company
InventorsQiang Yu, Srinivas Veeramasuneni, Weixin D. Song, Wenqi Luan
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Abstract
A reduced weight, reduced density gypsum panel that includes high expansion vermiculite with fire resistance capabilities that are at least comparable to (if not better than) commercial fire rated gypsum panels with a much greater gypsum content, weight and density.
Claims47
A gypsum panel comprising a gypsum core disposed between cover sheets, the gypsum core formed from a mixture comprising:
- stucco in an amount of about 1162 to about 1565 lbs/msf (about 5.7 to about 7.6 kg/m2), and
- high expansion particles in an amount of up to about 10% by weight of stucco, said particles having a volume expansion of about 300% or more of their original volume after being heated for about one hour at about 1560° F. (850° C.);
- the high expansion particles in an amount and distribution in the core effective to provide a High Temperature Shrinkage (S) in the X-Y direction of about 10% or less, and the panel having a density (D) of about 37 pounds per cubic foot (590 kg/m3) or less.
A gypsum panel comprising a gypsum core disposed between cover sheets, the gypsum core formed from a mixture comprising:
- stucco in an amount of about 1162 to about 1565 lb/msf (about 5.7 to about 7.6 kg/m2),
- high expansion particles in an amount of up to about 10% by weight of stucco, said particles having a volume expansion of about 300% or more of their original volume after being heated for about one hour at about 1560° F. (850° C.),
- starch in an amount of up to about 3% by weight of stucco, and
- mineral, carbon and/or glass fibers;
- the high expansion particles in an amount and distribution in the core effective to provide a High Temperature Shrinkage (S) in the X-Y direction of about 10% or less, the gypsum core effective to provide a Thermal Insulation Index (TI) of about 20 minutes or greater, and the panel having a density (D) of about 37 pounds per cubic foot (590 kg/m3) or less.
2 more elements
Dependencies are inferred from the claim text.