IMPROVED GYPSUM-CONTAINING PRODUCTS CONTAINING ALPHA-HEMIHYDRATE

摘要

The invention provides gypsum wallboard, made from gypsum-containing slurrie s having outstanding hydration rate characteristics comprising alpha-hemihydra te ground to a particular particle size distribution range and having a Blaine surface area in the range from about 3100 cm2/g to about 9000 cm2/g, alone o r in combination with beta-hemihydrate.