FIELD: construction.
SUBSTANCE: composition to impregnate surfaces of gypsum-containing items contains, wt %: liquid glass 6.70-6.75; aqueous solution of sodium methyl siliconate 5.45-5.50; acid fluoride 1.00-1.50; water 86.35-86.80. Liquid glass in the composition is sodium or potassium liquid glass.
EFFECT: volume hydrophobisation and free evaporation of water from gypsum-containing items, higher strength of gypsum-containing items due to colmation of pores of a surface layer and formation of reinforcing structure of new formations in pores.
3 cl, 2 tbl
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