FIELD: foundry, possibly manufacture of molding and core sands. SUBSTANCE: composition includes next ingredients (mass%): quartz sand - the base; binder "Polypham" - (1,2-1,8); matter with high heat conductance - (25-20). Such content of matter having high heat conductance in composition allows to eliminate occurring of shrinkage porosity in aluminum castings. EFFECT: possibility for making complex-shape large-size aluminum castings without shrinkage porosity. 1 tbl
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