Paper will inform you about the results of a comparison of several hydrophobic additives. Building components based on plaster without special treatment generally have high water absorption (~ 30 %) and they are therefore not suitable for areas with high incidence of moisture, where they can be exposed to direct contact with water. The trend leads towards lighter building materials, which often leads to an increased proportion of open porosity and thus to increased absorption. A suitable solution is utilization of hydrophobic additive during the production of gypsum building elements. Appropriately chosen additive can significantly reduce water absorption, even at relatively low addition and high mass lightening of element.
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