FIELD: metallurgy.
SUBSTANCE: invention refers to foundry engineering. The mixture contains the moulding sand filler, nonorganic salt and iron oxide. Nonorganic salt is selected from the group comprising sodium sulphate, potassium sulphate, calcium sulphate, magnesium sulphate, sodium nitrate, potassium nitrate, calcium nitrate, magnesium nitrate and their mixtures in quantity from 0.25 wt % to 5.0 wt % of the moulding sand filler weight. Iron oxide is selected from group comprising red iron oxide, black iron oxide and their mixtures.
EFFECT: reduced creation of cutting-outs.
20 cl, 1 tbl, 2 ex
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