FIELD: building materials production. SUBSTANCE: composition comprises, mas. %: binder, 24-60; magnesium sulfate, 14-32; filler, 5-34; surfactant, 0.3-0.5; organosilicium hydrophobic agent, 0.8-1.0; water soluble sulfates and/or chlorides of ferrum and/or aluminium, 3-5; and water, the balance. Strength of desired materials is up to 50 MPa, its volume mass is 0.85-1.85 g/cm3. EFFECT: improved quality. 1 tbl
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