FIELD: founding industry. SUBSTANCE: moulding sand has wt.-%: milled chamotte 64.4-87.4; ashes 4.6-27.6; technical lignosulfonates - the rest. The ashes has the molting point 1250-1350 C and is close to the refractory filler. Ceramic strengthening of the mould is exercised at the expense of melting the ashes during casting the mould with metal. EFFECT: enhanced strength characteristics of the moulding sand at the temperature of the cast metal. 2 tbl
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