METHOD FOR HYDRATING HEMIHYDRATE GYPSUM

摘要

A gypsum mold having good water absorbing properties, which is suitable for cast molding pottery, can be prepared by stirring a mixture of hemihydrate gypsum cooled to -40 to 5.degree.C and water to form a slurry of gypsum in water having a temperature of -5 to 10.degree.C, pouring it into a water-impermeable mold, maintaining it therein until the setting reaction thereof is completed and then releasing the set product from the mold.