SILRES® BS 38 is a solvent-based mixture of silane, siloxane and fluoropolymer (< C8). In diluted form, it serves to render inorganic substrates such as mineral construction materials water-repellent and oil-repellent. Unlike conventional impregnating agents, which display only a hydrophobic, i. e. water-repellent, effect, SILRES® BS 38 also exhibits an oleophobic, i. e. oilrepellent, effect. The pores of the substrate remain open, the water vapour diffusion is hardly affected, if at all. Oil, grease and paint, etc. can be more easily removed from surfaces that have been treated with SILRES® BS 38.


SILRES® BS 38 performs very well as:

  • 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.
  • 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.


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.

SILRES® BS 38 should be favourably diluted in a product:solvent-ratio 1 : 6 to 1 : 10 (parts by weight).
Suitable diluents are white spirit (e. g. White Spirit 130/175 or Shellsol T) and isoparaffins. A long storing period SILRES® BS 38 can lead to a deposit. In this case it should be mixed up again.

The substrate to be treated should be air dry and absorbent. The diluted solution should be liberally brushed onto substrate. The hydrophobic and oleophobic effects develop within 24 - 48 hours.

Because of possible discoloration, it is advisable to carry out tests area. This can also be used to check the efficiency of the products. Substrates treated with SILRES® BS 38 should be cleaned at once after contamination with oil, grease or paint because paint in particular is very difficult to dissolve once the binder has fully hardened. After cleaning and drying, it is necessary to repeat treatment with SILRES® BS 38.


SILRES® BS 38 forms a gel at storage temperatures under +10°C. Storing in a heated warehouse for several hours leads to liquefaction.

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.

Sales and support

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

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