Plaster molding composition

Details Plaster molding composition Plaster molding composition

B - Operations, Transporting

22

C

6/45

B22C 1/18 (2006.01)

Patent

CA 1113655

PLASTER MOLDING COMPOSITION Abstract of the Disclosure A fiber-free plaster molding composition which comprises by weight approximately 50-70% gypsum plaster, 5-25% fine expanded perlite, and 5-30% of a non-fibrous filler such as mica, silica, fly ash, pyrophyllite or mixtures thereof. The composition of this invention has good dry blending prop- erties, slurry characteristics, and wet and dry mold features, making it a suitable replacement for fiber-containing molding compositions for low fusion metal casting molds.

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