FIELD: manufacture of building materials.
SUBSTANCE: invention provides aqueous composition to coat consolidated gypsum material and method to treat consolidated gypsum-containing material, which composition contains at least one trimetaphosphate salt, at least one monobasic phosphate salt, and at least one acyclic polyphosphate salt containing at least three phosphate units. Consolidated gypsum material is treated by deposition of at least one compound thereon selected from at least two types of inorganic phosphate salts: monobasic phosphate salts, trimetaphosphate salts, and acyclic polyphosphate salts containing at least three phosphate units.
EFFECT: increased strength of consolidated gypsum containing materials, surface hardness, wear resistance and/or resistance against water-caused erosion.
36 cl, 4 tbl, 21 ex
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