SILRES® BS 1702 is a solvent-free silane/siloxane mixture, which may be applied in undiluted form or diluted with organic solvents. SILRES® BS 1702 serves as a high-quality specialty water repellent for impregnating fiber cement.


- good depth of penetration
- greatly reduces water absorption
- low volatility, hence little evaporation loss during application After application to the fiber cement SILRES® BS 1702 reacts with atmospheric moisture or pore water, thereby generating the active ingredient while liberating alcohol. The active ingredient greatly lowers the water absorbency of the fiber cement,w hich nevertheless retains a very high degree of water vapour permeability since neither pores nor capillaries are clogged.

SILRES® BS 1702 is recommended as a repellent impregnating agent and primer for normal and reinforced fiber cement elements.


SILRES® BS 1702 may be used in undiluted form or diluted with organic solvents. The concentration to be applied depends on the quality or porosity of the fiber cement substrate and the desired depth of penetration of the water-repellent agent. Since the penetration depth of the active silane/siloxane component depends directly on the concentration of active ingredient in the water-repellent agent, higher concentrations should be used for high-quality fiber cement with low porosity. For very high quality concretes we recommend applying <(> <<)>productname> either in undiluted form or in a concentration of no less than 1:4 (one part by weight of SILRES® BS 1702 to four parts of solvent). For fiber cement of lower quality, it may be diluted down to 1:9 if necessary.

Suitable solvents include aliphatic and aromatic hydrocarbons, particularly white spirits, and anhydrous alcohols, such as ethanol or 2-propanol.


SILRES® BS 1702 must be stored in the tightly closed original container under exclusion of moisture. The "Best use before end" date of each batch is shown on the product label. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.

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Wacker Chemical Corporation
3301 Sutton Road
Adrian, MI 49221-9397
United States
+1  888  922-5374 (Phone)

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