FIELD: foundry. SUBSTANCE: invention relates to binders for ceramic molds and cores in precision molding process, primarily to perform art and other fine-relief moldings. Distinguishing feature of invention is that, in a method of preparing ethyl silicate binder including hydrolysis of ethyl silicate in absence of organic solvents and with continuously measuring resistivity of system and introducing diluent under strictly defined proportion between hydrolyzate and initial ethyl silicate resistivities, ethyl silicate being hydrolyzed is diluted with a high-molecular surfactant solution on reaching indicated proportion: (4-8) x 10-5 for ethyl silicate-32 and (1-5) x 10-5 for ethyl silicate-40. EFFECT: enhanced efficiency of process. 3 cl, 2 tbl
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