FIELD: foundry. SUBSTANCE: composition includes refractory filler, liquid glass and black-resin pulp being waste of production of ethylene and acethylene at washing out pyrogas. Composition includes in addition reaction product of calcium - boron phosphate with water taken at mass relation 1 : (4 - 6) at next relation of ingredients ( mass%): liquid glass, 3.9 -4.1; black-resin pulp-waste of production of ethylene and acethylene at washing out pyrogas, 0.10 -0.25; above mentioned reaction product, 0.50 - 075, refractory filler - the balance. Addition of said reaction product to composition allows to decrease content of black-resin pulp making worse conditions of moistening filler grains with liquid glass. EFFECT: enhanced strength of composition after heat drying, improved sanitary condition of production process. 2 cl, 2 dwg, 2 tbl, 6 ex
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