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Polymethyl hydrogen siloxane is a silane/siloxane high performance penetrative masonry water repellent. The product is free of solvent and hazardous ingredients. It forms a hydrophobic barrier beneath the surface and seals out moisture while remaining highly vapor permeable. It will chemically bond with the substrate. The visual appearance of the treated surfaces will show nominal or no change resulting from product application. The benefits include enhanced resistance to efflorescence, freeze thaw damage, cracking and spalling. Cured system is resistant to ultraviolet light and may be used as a sealer for surface coatings. Silox-Seal (Silane/Siloxane) is used to protect and maintain bridges, parking garages, airport pavements, industrial plants and other concrete structures Teloon Chemicals MH-20 series Polymethyl hydrogen siloxane is just that kind of materials which can be used in gypsum, masonry and timber industry and have been exported to many countries and well accepted by customers. We may provide uses instruction as customer’s request.