FIELD: manufacture of building materials. SUBSTANCE: composition contains (in wt %): gypsum semihydrate, 78.2-85.62; Portland cement, 11.85- 7.6; cellulose fibers, 9.5-6.3; industrial lignosulfonates, 0.45- 0.48. Composition can be applied to manufacture facing boards and other building materials. EFFECT: increased bend strength and water resistance. 1 tbl
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