SpecChem > Products > Water Repellents > SpecSilane 40 WB

SpecSilane 40 WB Green Conscious Product

40% solids water-based penetrating silane sealer

SpecSilane 40 WB is a 40% solids, 100% reactive waterborne silane sealer. This clear, penetrating, breathable water repellent is designed for use on interior and exterior above-grade concrete or masonry surfaces. It penetrates the surface and bonds directly with the substrate, resulting in a surface highly resistant to both moisture and salt.

  • Excellent Chloride Screen: Provides superb protection against chloride penetration.
  • Water Repellency: Enhances water repellency while maintaining the substrate’s breathability.
  • Eco-Friendly: VOC compliant and water-based, reducing environmental impact.
  • Durable: Offers long-lasting protection for new and existing concrete surfaces.
  • Non-Yellowing: Maintains the natural appearance of the substrate without discoloration.
  • Application Versatility: Suitable for decks, pavements, parking structures, ramps, bridges, and marine platforms.

Tech Sheet
Safety Sheet
Sell Sheet


  • Surface Preparation: Ensure surfaces are well cured (minimum 28 days), clean, and free from all residues, dust, debris, oil, and other contaminants. Surfaces must be absorptive to allow penetration.
  • Application Rate: Varies by surface porosity:
    • Porous surfaces: 100-125 ft²/gal
    • Broom finish: 100-150 ft²/gal
    • Smooth concrete: 150-200 ft²/gal
  • Equipment: Apply using a roller, brush, or low-pressure sprayer. Avoid puddles; redistribute any standing material before drying.


  • Available in 5-gallon pails and 55-gallon drums.

Shelf Life

  • Store sealed in a clean, dry area between 45-85°F. Shelf life is one year in unopened containers.

Test Data

  • Solids Content: 40% by weight
  • VOC Content: Less than 250 grams per liter
  • Flash Point: Greater than 200°F
  • Specific Gravity: 0.96 at 25°C
  • Color: Water clear
  • Odor: None
  • Water Absorption Test: 0.40% over 48 hours; 1.1% over 50 days
  • Scaling Resistance Test: Rating of 0 for “No Scaling”