Method for producing hard plaster of paris

Details Method for producing hard plaster of paris Method for producing hard plaster of paris

1979-10-11

1980-11-18

Hearn, Brian E.

Compositions: coating or plastic

Coating or plastic compositions

Proteinaceous material containing

423172, 423555, C01F 1146, C04B 1100

Patent

active

042343453

ABSTRACT:
Fast-setting alpha calcium sulfate hemihydrate made from calcium sulfate dihydrate by hydrothermally recrystallizing calcium sulfate dihydrate to form a mixture containing 95%-99% by weight alpha calcium sulfate hemihydrate and 5 to 1% calcium sulfate dihydrate. The dihydrate in this mixture is then converted to beta calcium sulfate hemihydrate by calcining, except for a remainder of up to 0.5 percent of dihydrate, which remains in the mixture.

REFERENCES:
patent: 1901051 (1933-03-01), Randel
patent: 2341426 (1944-02-01), Dailey
patent: 3083110 (1963-03-01), Preston
patent: 3305375 (1967-02-01), Jakacki
patent: 3337298 (1967-08-01), Ruter
patent: 3410655 (1968-11-01), Ruter
patent: 3723146 (1973-03-01), Lane
patent: 3913571 (1975-10-01), Bayer
Anderson, J., Applied Dental Materials, Blackwell Scientific Publications, Oxford, England, (1967) pp. 179-192.

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