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US 10,850,425 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.
Claims30
A gypsum panel comprising:
- a gypsum core disposed between cover sheets;
- the gypsum core comprising a crystalline matrix of set gypsum and high expansion particles, 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 core effective to provide a density of the panel of about 37 pounds per cubic foot (590 kg/m3) or less and a core hardness of at least about 11 pounds (50 N);
- and,
- when the panel is arranged in an assembly constructed in accordance with any one of UL Design Numbers U305, U419 or U423 and having a single layer of the gypsum panel on a first side of the assembly and a single layer of the gypsum panel on a second side of the assembly,
- when surfaces of the gypsum panel on the first side of the assembly are heated at temperatures in accordance with the time-temperature curve of ASTM E119-09a,
- and when surfaces of the gypsum panels on the second side of the assembly are provided with temperature sensors that provide temperature values pursuant to ASTM E119-09a,
- the maximum single value of the temperature sensors is less than about 500° F. (260° C.) after about 50 minutes;
- or
- the average value of the temperature sensors is less than about 380° F. (190° C.) after about 50 minutes.
7 more elements
A gypsum panel comprising:
- a 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 gypsum core disposed between cover sheets;
- the core effective to provide a density of the panel of about 37 pounds per cubic foot (590 kg/m3) or less;
- and
- when the panel is arranged in an assembly constructed in accordance with any one of UL Design Numbers U305, U419 or U423 and having a single layer of the gypsum panel on a first side of the assembly and a single layer of the gypsum panel on a second side of the assembly,
- when surfaces of the gypsum panel on the first side of the assembly are heated at temperatures in accordance with the time-temperature curve of ASTM E119-09a,
- and when surfaces of the gypsum panels on the second side of the assembly are provided with temperature sensors that provide temperature values pursuant to ASTM E119-09a,
- the maximum single value of the temperature sensors is less than about 500° F. (260° C.) after about 50 minutes;
- or
- the average value of the temperature sensors is less than about 380° F. (190° C.) after about 50 minutes.
9 more elements
Dependencies are inferred from the claim text.