FIELD: molding equipment. SUBSTANCE: cold-hardening blend for manufacturing mold cores and molds contains 100 wt parts of quartz sand, 1.5-2.5 wt parts of alkaline polyphenol resin, and ester-type hardener in proportion of 25-30% on the weight of resin, said hardener being, in particular, composed of ethylene glycol acetates or their mixtures with γbutyrolactone or propylene carbonate. EFFECT: enabled controlling viability and hardening rate of cold-hardening blends within a wide range. 14 tbl
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