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

1992-04-13

1993-01-05

Lin, Kuang Y.

Metal founding

Process

Shaping a forming surface

164529, B22C 100, C04B 704, C04B 1130

Patent

active

051761955

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, control ground and screened beta-hemihydrate gypsum, sucrose for protection against thermal shock, and a foaming agent.

REFERENCES:
patent: 2753608 (1956-07-01), Nolan
patent: 2861893 (1958-11-01), Brewsler
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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