Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Wacker SILRES BS 39 Silane/Siloxane

Wacker SILRES BS 39 is a silane/siloxane-based water-repellent impregnation agent from Wacker’s SILRES BS series. It delivers deep-penetrating, durable hydrophobicity for concrete, masonry and natural stone without altering appearance or breathability. The formulation combines alkylalkoxysilane reactivity with siloxane flexibility for long-term protection against moisture, frost and efflorescence while maintaining substrate vapor permeability.
  • wacker silres bs 39 silane siloxane_f4fb7df7
  • wacker silres bs 39 silane siloxane_f4fb7df7

Features Of Wacker SILRES BS 39 Silane/Siloxane

  1. Hydrophobic and oleophobic surface protection for mineral substrates.

  2. Excellent water repellency while maintaining substrate breathability (vapor-permeable).

  3. Stable in aqueous alkaline systems, enabling direct integration into cementitious and lime-based formulations.

  4. Low-VOC formulation compliant with EU Ecolabel and other sustainability-focused regulatory frameworks.

  5. Enhances resistance to efflorescence, frost damage, and surface soiling without altering substrate appearance.

Typical Applications Of Wacker SILRES BS 39 Silane/Siloxane

  1. Water-repellent additive for exterior renders and façade plasters.

  2. Protective treatment for concrete, natural stone, and brick masonry.

  3. Functional ingredient in repair mortars and restoration products for historic buildings.

  4. Performance enhancer in tile adhesives and grouts exposed to damp environments.

  5. Key component in breathable, hydrophobic facade coatings and mineral paints.

Specifications Of Wacker SILRES BS 39 Silane/Siloxane

Chemical TypeAlkylalkoxysilane / siloxane hybrid
Product FormAqueous dispersion
AppearanceOpaque white to slightly yellowish liquid
pH (10% aqueous solution)8.5 – 9.5
Solids Content25 – 27 wt.%
Density (20 °C)1.02 – 1.06 g/cm³
Storage Stability≥ 6 months at 5–30 °C in sealed original container
Primary ApplicationsMineral building materials protection


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