High permeability metal casting plaster and method of making sam

Details High permeability metal casting plaster and method of making sam High permeability metal casting plaster and method of making sam

1990-10-03

1992-11-17

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 3825, 106 3827, 106735, 106782, C04B 704, C04B 1130

Patent

active

051640040

ABSTRACT:
A high permeability metal casting plaster is used for production of high accuracy simulated castings for prototypes and any other plastermold castings. Methods are provided that create the high permeability metal casting plaster and mold. Also, a high permeability metal casting plaster is disclosed that uses control ground and screened .alpha.-hemihydrate gypsum such that an average of 100% of the particles have a diameter of no more than 590 .mu.m and an average of 97.3% have a diameter of less that 44 .mu.m, control ground and screened beta-hemihydrate gypsum such that an average of 99% of the particles have a diameter of no more than 270 .mu.m and at least an average of 70% have a diameter of less than 44 .mu.m, sucrose for protection against thermal shock, and a foaming agent. The ratio of .alpha.-hemihydrate gypsum to .beta.-hemihydrate gypsum is approximately 5:2.

REFERENCES:
patent: 2753608 (1956-07-01), Nolan
patent: 2861893 (1958-11-01), Brewster
patent: 3748290 (1973-07-01), Reingen
patent: 4127628 (1978-11-01), Uchida et al.
patent: 4749431 (1988-06-01), Fassle et al.
patent: 4818287 (1989-04-01), Ravins et al.

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