ACCELERATOR FOR GYPSUM PLASTER

摘要

1276539 Plaster accelerators UNITED STATES GYPSUM CO 1 Aug 1969 [19 Aug 1968] 38770/69 Heading C1H A plaster accelerator is obtained by grinding a charge containing gypsum and a sugar until the surface area is substantially increased and heating under conditions precluding dew point formation to calcine partly the dihydrate. The charge can be anhydride containing combined water and so equivalent to having a gypsum content, or it can be a mixture of e.g. gypsum, sugar and sand. Boric acid is optional.