| 摘要 |
A mold material for forming sandmolds for manufacturing metal castings, consisting essentially of an organic binder: 0.4 - 3.0 percent, a catalyst for curing the organic binder: 0.2 - 2.0 percent of, a ceramic binder: 0.05 - 2.0 percent in terms of SiO2, a catalyst for curing the ceramic binder: 0.05 - 2.0 percent, and foundry sand: the balance. The mold material can be formed into a sandmold which is excellent in both strength after exposure under a room temperature atmosphere and strength after pouring molten metal thereinto and requires no mold wash or a very small amount of mold wash as obtained by spraying or the like. The mold material may preferably further includes, if required, anti-infiltration fire-proof powder: 0.1 - 3.0 percent, a high-temperature reinforcing material: 0.1 - 3.0 percent, a viscosity adjuster: 0.1 - 2.0 percent, and/or a grannular carbon stabilizer: 0.03 - 0.5 percent.
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