Siloxane WB Concentrate


A durable, high-performance water repellent

Siloxane WB Concentrate effortlessly blends with fresh water at the construction site, creating a penetrating water repellent perfect for treating both dense and porous masonry surfaces. Serving as a viable substitute for traditional solvent-based silanes or siloxanes, Siloxane WB deeply infiltrates and chemically adheres to the masonry substrate, ensuring prolonged defense against water-induced staining or damage.

Product Data Sheet

Safety Data Sheet


  • Deep Penetration: Effective on both vertical and horizontal surfaces.
  • Suitable for Field or In-Plant Treatment: Ideal for treating precast concrete.
  • Flexible Mixing: Can be mixed with up to 19 parts fresh water.
  • High Coverage: One gallon concentrate treats up to 4,000 square feet (Consult coverage rates).
  • Shrinkage Crack Resistance: Resists water penetration when applied over existing shrinkage cracks of 0.02 inches or less.


  • Shelf Life: 1 year in tightly sealed, unopened container.
  • VOC Content: 16–41 g/L as diluted Low Solids Coating.
  • Formulation: Clear, amber liquid; vinegar-like odor.
  • pH: Non-applicable.
  • Coverage Rate: 50 - 200 sq ft/gal. See Product Data Sheet for variations per substrate.
  • Freeze Point: Below -22° F (Below -30° C).
  • Flash Point: 77° F (25° C) ASTM D 3278, 140° F (60° C) in 1:9 dilution, 145° F (62° C) in 1:14 dilution.
  • Total Solids: 48% ASTM D 5095.
  • Weight per Gallon: 7.9 lbs.


Additional information

Weight N/A
Dimensions 1 × 1 × 1 in

1 Gallon, 5 Gallon