FIELD: building material industry, more particularly manufacture of constructional and heat-insulating foam concrete and also preparation of stable foams for other purpose. SUBSTANCE: foaming agent comprises protein hydrolysate of antibiotic waste, metal, e.g. iron, sulfate, and water, ratios of components being as follows: wt % protein hydrolysate of antibiotic waste, 1.2- 1.8; metal sulfate, 0.3-0.6; and water, the balance. EFFECT: higher stability of foam and lower density of foam concrete. 1 ex, 2 tbl
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