Product introduction

YAC-IN813 is high purity, undiluted iso-octyltrimethoxysilane. When diluted with an appropriate solvent, it can be used in the formulation of water repellent products. Upon proper application, the formulated product will penetrate and provide water repellency by chemically reacting with the cementitious substrate. Treated substrates are hydrophobic and retain their original appearance.

YAC-IN813 silane crosslinking agent is a small molecule to allow for deep penetration into the cementitious surface. This material reacts with moisture in the air and in the substrate in the presence of an alkaline or acidic environment to produce hydroxyl groups. These hydroxy groups will bond with the substrate and itself to produce a hydrophobic treatment that inhibits water absorption into the substrate. An alkaline environment, such as new concrete, will catalyze the reaction and speed the formation of the hydrophobic surface.

YAC-IN813 is the equivalent of Dow's Z-6672, Wacker's IO-TRIMETHOXY.


Methods of application include airless sprayer, roller and brush. When a brush or roller is used, repeated applications should be made until the surface remains moist for a few minutes. If an airless sprayer is used, application should continue until the substrate is thoroughly saturated. Sprayers should be fitted with solvent resistant hoses and gaskets. A test application is necessary on each surface to be treated to ensure compatibility and the desired water repellent result. Surfaces should be free of standing water, surface dirt, dust, oils, and other contaminants. The formulated YAC-IN813 may be applied to damp surfaces although dry surfaces are preferred to achieve maximum penetration into the substrate.

YAC-IN813 alkyl alkoxy silane can be used as a surface modifier to generate hydrophobicity and to increase compatibility to organic non polar matrices.

Blends of the solvents can also be used. The evaporation rate of the diluted material can be modified depending on the type and concentration of the solvent. Select the proper solvent for your application, as some silane/solvent blends may darken the surface.

Packing and Storage

YAC-N4813 is supplied in 175Kg steel drum.

In the unopened original container YAC-N4813 has a shelf life of one year in a dry and cool place.