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.