Plaster molding composition

Details Plaster molding composition Plaster molding composition

1977-12-19

1979-04-10

Poer, James

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106109, 106110, 106DIG1, 106DIG2, 106 389, B28B 734

Patent

active

041486609

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

REFERENCES:
patent: 2980548 (1961-04-01), Hampton
patent: 3311516 (1967-03-01), Jaunarajs
patent: 3819388 (1974-06-01), Cornwell

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