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

Wacker SILRES BS SMK 550 Silane/Siloxane

Wacker SILRES BS SMK 550 is a silane/siloxane-based hydrophobic impregnation agent from Wacker’s SILRES BS series, designed for deep-penetration water repellency in mineral building materials without altering appearance or vapor permeability.
  • wacker silres bs smk 550 silane siloxane_050b9c0a
  • wacker silres bs smk 550 silane siloxane_050b9c0a

Features Of Wacker SILRES BS SMK 550 Silane/Siloxane

  1. Hybrid silane-siloxane chemistry enabling both covalent bonding to substrates and hydrophobic film formation.

  2. Water-dilutable formulation for easy integration into aqueous-based systems without organic solvents.

  3. Excellent alkali resistance, maintaining performance in cementitious and high-pH environments.

  4. Low VOC content, supporting compliance with stringent environmental and occupational health regulations.

  5. Stable dispersion in water with long shelf life under recommended storage conditions.

Typical Applications Of Wacker SILRES BS SMK 550 Silane/Siloxane

  1. Concrete and mortar surface protection against water, chloride ingress, and freeze-thaw damage.

  2. Water-repellent treatment for natural stone, brick, and clay-based masonry.

  3. Additive in exterior renders and façade coatings to enhance durability and breathability.

  4. Functional component in grouts and repair mortars to improve adhesion and reduce efflorescence.

Specifications Of Wacker SILRES BS SMK 550 Silane/Siloxane

Chemical TypeAlkoxy-functional silane/siloxane hybrid
Product FormAqueous dispersion
AppearanceClear to slightly opalescent liquid
pH (1% aqueous solution)4.5 – 5.5
Solids ContentApprox. 25 wt.%
Density (20 °C)Approx. 1.02 g/cm³
Storage Stability≥ 12 months at 5–30 °C in original sealed container
Primary ApplicationsWater-repellent impregnation of mineral building materials


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