Method for hydrating hemihydrate gypsum
AssigneeToto Ltd.
InventorsTatsuhiro Kosugi, Masahiko Suemitu, Masami Goto
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Abstract
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.degree. to 5.degree. C. and water to form a slurry of gypsum in water having a temperature of -5.degree. 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.
Claims4
A method for hydrating hemihydrate gypsum which comprises the steps of stirring a mixture of hemihydrate gypsum cooled to -40.degree. to 5.degree. C. and water to form a slurry of gypsum in water having a temperature of -5.degree. to 10.degree. C., pouring it into a water-impermeable mold, maintaining it therein until a setting reaction thereof is completed and then releasing a set product from the mold.
Dependencies are inferred from the claim text.