Plaster molding composition

Details Plaster molding composition Plaster molding composition

1976-02-23

1978-03-28

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 389, 106109, 106110, 106315, 106DIG1, B28B 728

Patent

active

040812839

ABSTRACT:
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 properties, slurry characteristics, and wet and dry mold features, making it a suitable replacement for fibrous talc-containing molding compositions for low fusion metal casting molds.

REFERENCES:
patent: 2508600 (1950-05-01), Fitzsimmons
patent: 3100715 (1963-08-01), Leonard
patent: 3311516 (1967-03-01), Jaunarajs et al.
patent: 3369929 (1968-02-01), Petersen
patent: 3804701 (1974-04-01), Bognar
patent: 3862881 (1975-01-01), Taniguchi et al.

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