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The article presents the results of studies of physical and mechanical properties of the samples modified with the following additives: redispersible polymer powder based on a copolymer of vinyl acetate and vinyl versatate; polyvinyl acetate dispersion; sodium carboxymethyl cellulose; silica fume; chrysotile asbestos; phosphoric acid, oxalic acid and sulfuric acid. The calculation of the optimal composition of the magnesia binder based samples with the chrysotile asbestos additive, modified with sulfuric acid. There are results of the X-ray analysis of the samples with the chrysotile asbestos additive shown. There is a chemical reaction of caustic magnesite and silica fume confirmed.

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