Plaster molding composition

Details Plaster molding composition Plaster molding composition

B - Operations, Transporting

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C

6/45

B22C 1/18 (2006.01) B22C 1/00 (2006.01)

Patent

CA 1074954

PLASTER MOLDING COMPOSITION Abstract of the Disclosure A fibrous talc-free plaster molding composition comprises by weight approximately 50-70% gypsum plaster, 5-20% fibrous wollastonite, 5-25% fine expanded perlite, and 0-40% of a filler selected from the group consisting of sand, fly ash, pyrophyllite and mixtures thereof. The composition of this invention has good dry blending pro- perties, slurry characteristics, and wet and dry mold fea- tures, making it a suitable replacement for fibrous talc- containing molding compositions for low fusion metal cast- ing molds. -1-

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