Method for hydrating hemihydrate gypsum

Details Method for hydrating hemihydrate gypsum Method for hydrating hemihydrate gypsum

1988-10-13

1990-03-06

Russel, Jeffrey E.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

106109, 156 39, 264 28, C01F 1146, B29C 3516

Patent

active

049064495

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.

REFERENCES:
patent: 3179528 (1965-04-01), Holmgren et al.
patent: 4443261 (1984-04-01), Nordqvist
patent: 4540439 (1985-09-01), Kurandt
Tonindustrie Zeitung, 94(1970), Nr. 9, pp. 357-361, "Studium des Einflusses des Wasswedampfdrucks aut die . . . ".

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