D,L Tartaric acid as retardant for gypsum plaster

Details D,L Tartaric acid as retardant for gypsum plaster D,L Tartaric acid as retardant for gypsum plaster

1976-09-14

1978-06-13

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Proteinaceous material containing

106315, C04B 1114

Patent

active

040946932

ABSTRACT:
Industrial gypsum plaster (plaster of Paris) having a delayed setting time is prepared by including D,L-tartaric acid and sufficient calcium hydroxide that a 5 weight % aqueous suspension of the plaster has a pH of at least 11.5.

REFERENCES:
patent: 169212 (1875-10-01), Warwick
patent: 392481 (1888-11-01), Williams
patent: 422269 (1890-02-01), West
patent: 449653 (1891-04-01), Abell
patent: 2508480 (1950-05-01), Ainsworth
Riddle II, W. C. "Calcined Gypsum" Roch Products, Oct. 1954, pp. 109-113.

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