FIELD: technological processes.
SUBSTANCE: invention relates to the foundry. Binder contains, wt. %: silica powder with a particle size of 8–10 nm, content of SiO2 25–31 % not less than 95, polyvinyl alcohol 0.003–0.005, alkylbenzenesulfonic acid is not less than 0.01, a mixture of penta-475 is not less than 0.001 with laprol 6003 0.015–0.0225, bactericide is an aqueous solution of formalin not more than 3.0, desalted water.
EFFECT: provides good wettability of the previous layers of the ceramic form, optimal values of open porosity, high strength at elevated temperatures.
1 cl, 2 tbl, 5 ex
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