In this article, a new organosilicon polymer is synthesized and a composition based on the obtained substance is created. The possibilities of obtaining hydrophobic gypsum by adding the created composition to the gypsum mixture are described. Water absorption, bending strength and compression of a gypsum sample under the action of a composite composition were also investigated. It has been established that due to the decrease in water absorption, the compressive strength of gypsum increased by 35% compared to the sample.

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