PURPOSE:To improve the collapsing property of molding sand after charging molten metal by adding a mixture composed of foamed styrene powder coated with wax and phenolic resin powder slightly to known molding sand. CONSTITUTION:A mixture composed of foamed styrene powder coated with wax and phenolic resin powder is added at about 0.1-0.5% to exothermic self-curing molding sand which evolves heat by reacting with inorg. binders and CO2 molding sand which is cured by the gaseous CO2 used for the same. Sand stripping property is thus considerably improved and the casting surface and quality of the casting are improved.
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