SILRES® BS 39 is a water-thinnable mixture of silane, siloxane and synthetic resins. It is used in diluted form to impart both water repellency and oil repellency to inorganic substrates such as mineral construction materials. In this respect, it differs from conventional (mono-functional) water-repellents. The pores of the substrate remain open, the water vapor diffusion is hardly affected, if at all. Oil, grease, paint, etc. are easier to remove from surfaces that have been treated with SILRES® BS 39.


All the information provided is in accordance with the present state of our knowledge. Nonetheless, we disclaim any warranty or liability whatsoever and reserve the right, at any time, to effect technical alterations. The information provided, as well as the product's fitness for an intended application, should be checked by the buyer in preliminary trials. Contractual terms and conditions always take precedence. This disclaimer of warranty and liability also applies particularly in foreign countries with respect to third parties' rights.

Dilute SILRES® BS 39 in a ratio of 1:3 to 1:6 (parts by weight) with tap water. Diluted solutions that have been stored for a long period are likely to show signs of slight creaming and should be shaken up thoroughly before use.
The surface to be treated should be air dry and absorbent. Apply the diluted solution liberally by brush or spray. The hydrophobic and oleophobic effects start to develop within 24 hours and are complete within 1 week.
Because of possible discoloration, it is advisable to carry out tests on a test area. This is also an opportunity for checking the product´s efficacy. Surfaces treated with SILRES® BS 39 should be cleaned at once after contaminations with oil, grease or paint because paint in particular is very difficult to dissolve once the binder has fully hardened.
Surfaces that have been cleaned and dried might need re-treating with SILRES® BS 39.

  • Treatment of floors of natural or synthetic stone, or unglazed ceramic tiles for easy care.
  • Treatment of window sills and table tops of natural or synthetic stone, or fibrous cement to avoid staining.
  • Treatment of facades of natural or synthetic stone, concrete, or fibrous cement in order to allow easier removal of dirt, grease, graffiti, posters, etc. from monuments, exterior and interior walls.
  • Water, oil and dirt repellent treatment of low-porosity natural stone, e. g. marble, travertine and granite.


The containers must be protected against sunlight. 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.

SILRES® BS 39 contains minor amounts of a preservative that protects the emulsion against microbial contamination and fungal attack. The quality of the water used may make it necessary to add a biocide after dilution in principle, nearly any waterbased preservative may be used.

Sales and support

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

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