Method for hydrating hemihydrate gypsum

Details Method for hydrating hemihydrate gypsum Method for hydrating hemihydrate gypsum

C - Chemistry, Metallurgy

04

B

25/103

C04B 40/00 (2006.01) B28B 7/34 (2006.01)

Patent

CA 1318109

ABSTRACT OF THE DISCLOSURE 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°C and water to form a slurry of gypsum in water having a temperature of -5 to 10°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.

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