Method of manufacturing gypsum board with improved fire resistance
AssigneeGold Bond Building Products, LLC
InventorsEli Stav, Jie Ling, Brad Busche, Joseph J. Bailey, R. G. Iyer, Veda Evans
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Abstract
The present disclosure is directed to a method of manufacturing gypsum board as well as the resulting gypsum board. The method comprises providing a gypsum slurry with a shrinkage-reducing additive comprising a metal salt of an acid, a silica, or a mixture thereof. As a result, the gypsum board includes gypsum and a shrinkage-reducing additive comprising a metal salt of an acid, a silica, or a mixture thereof. The gypsum board exhibits an area shrinkage of less than 10%.
Claims14
A method for manufacturing a gypsum board, the method comprising:
- providing a gypsum slurry comprising stucco and a shrinkage-reducing additive comprising a silica comprising colloidal silica, precipitated silica, or a mixutre thereof onto a bottom facing material, wherein the shrinkage-reducing additive is present in an amount of 0.05 wt. % or more to 2 wt. % or less based on the weight of the stucco, and
- providing a top facing material on the gypsum slurry,
- wherein the gypsum board exhibits an area shrinkage of 10% or less, and
- wherein the gypsum board exhibits a nail pull strength of 70 lbf or more.
A gypsum board comprising:
- gypsum and a shrinkage-reducing additive comprising a silica wherein the shrinkage-reducing additive is present in an amount of 0.05 wt. % or more to 2 wt. % or less based on the weight of the gypsum, wherein the silica is from colloidal silica, precipitated silica, or a mixutre thereof,
- wherein the gypsum board exhibits an area shrinkage of 10% or less, and
- wherein the gypsum board exhibits a nail pull strength of 70 lbf or more.
Dependencies are inferred from the claim text.