Patent ID: 8197952
Filing Date: 2012-06-12
Classification: C04B,Y02W,Y10T

Abstract:
1. A light weight gypsum board comprising: a set gypsum composition disposed between two cover sheets, the set gypsum composition formed from at least water, stucco, pregelatinized starch, and a naphthalenesulfonate dispersant; the pregelatinized starch is in an amount from about 0.5% to about 10% by weight based on the weight of the stucco, and the naphthalenesulfonate dispersant is in an amount from about 0.2% to about 3.0% by weight based on the weight of the stucco; the board has a density of about 34 lb/ft at a board thickness of about ½ inch, the board has a nail pull resistance of at least about 65 lb, a core hardness of at least about 11 lb, and a flexural strength of at least about 36 lb in a machine direction and/or about 107 lb in a cross-machine direction, the nail pull resistance, the core hardness and the flexural strength determined according to ASTM standard C473.