FIELD: manufacture of building materials, more particularly heat-insulating noncombustible ecologically pure, atmosphere-resistant materials used in building structures. SUBSTANCE: composition comprises wt.%: silicon-containing tripoli component, 42.0-50.0; metallic sodium hydroxide additive, 3.0-7.0; liquid glass 8.0- 15.0; and the water balance. EFFECT: improved physical and mechanical properties, high resistance to exposure to open fire, acid resistance, lower heat conduction, water absorption and reduced power consumption for manufacturing process. 2 tbl
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