FIELD: process engineering.
SUBSTANCE: invention relates to metal forming. Mix comprises quartz sand. Binder based on urea-furan resin "КФ-90" and modifying micro additives, and hardening catalyst "КЧ-41". Modifying micro additives represent dust from the mill of foundry aspiration system electric filters, pre-activated in two-rotor blade mixer, and, if required, chromoaluminium powder (AC).
EFFECT: decreased pore and pock hole formation, higher heat resistance of resin binder.
4 cl, 1 dwg, 2 tbl
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