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Hydrophobic Impregnation

A comparison of capillary water uptake: the untreated substrate absorbs water (left picture). When hydrophobic impregnation is applied, the water beads off (right picture).

With SILRES® BS, WACKER offers hydrophobic impregnations that siliconize the pores of mineral substrates. Unlike film-forming coatings, organosilicon-based water-repellent agents do not block pores, and so maintain the breathabilityof the substrate. At the same time, water can no longer penetrate into capillaries in liquid form, since, as a polar liquid, it is unable to interact with the non-polar hydrophobic surface.


SILRES® BS has a good penetration depth. Because it is not film-forming, water vapor can escape.

Reduction of capillary water uptake by at least 80%:

  • Low capillary water uptake is the most efficient protection against rain and damp
  • Hydrophobic impregnation reduces water uptake and retains water vapor permeablity

Extremely long-lasting protection from water due to:

  • High penetration depth
  • Sufficient resistance to alkalis
  • UV stability
  • Freeze-thaw resistance

Film-forming systems (coating and impregnation) will not be permeable to water vapor. Water penetrates at damaged areas and causes further deterioration.