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| 配方类型： |
METALS AND THEIR TREATMENT |
| 配方说明： |
Porous Gypsum Mold (Japanese Patent 706 (1956)) |
| 配方组成： |
Borax/0.9
Aluminum Powder/0.4
Calcined Gypsum/70.0
Water/80.0
Calcium Carbide/-
Caustic Soda/0.6
Quartzite (100 mesh)/28.0
Talc Powdered/- |
| 配制方法： |
Mold without removing hydrogen; heat at 80 to 100'C. for one hour and at 220'C. for one hour. |
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