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US 12,448,334 B2Granted
High temperature sag resistant gypsum panel
AssigneeKnauf Gips KG
InventorsMark K. Hemphill, Qinghua Li, Aaron D. Johnson
Life of this patent
Estimating the term…
Abstract
A fire-resistant gypsum panel comprises: a gypsum core layer comprising set gypsum and a high temperature sag-resistant material including mineral wool in an amount between 0.2% and 3.0% by weight of gypsum.
Claims28
A fire-resistant gypsum panel comprising:
- a gypsum core layer comprising set gypsum and mineral wool in an amount of between greater than 0.9% and less than or equal to and 3.0% by weight of stucco, wherein the mineral wool includes spun or drawn mineral rock material, and wherein the gypsum panel at a temperature of 1600° F. has a sag reduction of at least 10% compared to a gypsum panel that includes glass fiber in place of the mineral wool but is otherwise likewise configured.
A set gypsum core for a gypsum panel comprising:
- a. set gypsum;
- and
- b. a mineral wool in an amount greater than 0.9% and less than or equal to 3.0% by weight of the stucco, wherein the mineral wool includes spun or drawn mineral rock material,
- wherein the gypsum panel at a temperature of 1600° F. has a sag reduction of at least 10% compared to a gypsum panel that includes glass fiber in place of the mineral wool but is otherwise likewise configured.
1 more element
A composition for forming a gypsum core for a gypsum panel comprising:
- a. water;
- b. stucco;
- and
- c. mineral wool in an amount greater than 0.9% and less than or equal to and 3.0% by weight of the stucco, wherein the mineral wool includes spun or drawn mineral rock material;
- wherein the gypsum panel at a temperature at 1600° F. has a sag reduction of at least 10% compared to a gypsum panel that includes glass fiber in place of the mineral wool but is otherwise likewise configured.
2 more elements
A method for making a gypsum panel comprising:
- a. preparing a slurry comprising water, stucco, and mineral wool in an amount greater than 0.9% and less than or equal to 3.0% by weight of the stucco, and wherein the mineral wool includes spun or drawn mineral rock material;
- b. combining the prepared slurry with aqueous foam to provide an air-foamed slurry;
- c. forming a gypsum core from the air-foamed slurry;
- d. allowing the formed gypsum core to set;
- and
- e. drying the gypsum core,
- wherein the gypsum panel at a temperature at 1600° F. has a sag reduction of at least 10% compared to a gypsum panel that includes glass fiber in place of the mineral wool but is otherwise likewise configured.
4 more elements
Dependencies are inferred from the claim text.