FIELD: manufacture of heat-insulating material, more particularly foam glass as heat insulating material of production equipment, pipelines and refrigerating plants. SUBSTANCE: composition comprises evulcanic glass, sodium hydroxide, crushed container glass and nepthelite syenite, ratios of components being as follows wt.%: nepheline sienite, 5-15; crushed container glass, 45-55; sodium hydroxide, 7-9; and vulcanic glass, the balance. EFFECT: improved properties of the composition. 5 tbl
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