FIELD: chemistry.
SUBSTANCE: invention relates to organic-mineral modifiers of fibre-cement compositions and can be applied in production of fibre-cement plates. Organic-mineral modifier for fibre-cement compositions contains thermally processed kaolin - metakaolin, activated by 3% solution of formic acid with ratio metakaolin : formic acid =1:1 and dried to constant mass, and additionally polyphenylethoxysiloxane, with the following component ratio, wt %: polyphenylethoxysiloxane 0.75-1.0, polyacrylamide 0.25-0.5, metakaolin - the remaining part.
EFFECT: increase of strength, frost resistance, reduction of water absorption by fibre-cement plates.
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