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Protectosil® CHEM-TRETE® BSM 400

FOR BRICK, CONCRETE AND CONCRETE MASONRY BUILDINGS for unsurpassed performance

Protectosil® CHEM-TRETE® BSM 400 brings you the next generation in silane technology. Our chemists have developed a pure silane that yields a water repellent with the longest service life available, unsurpassed performance on brick masonry and the lowest possible levels of volatile organic compounds. Protectosil® CHEM-TRETE® BSM 400 can be applied in the most extreme temperature conditions without changing the surface appearance of the substrate.


Protectosil® CHEM-TRETE® BSM 400 does not leave any residue on glass or metal.

By penetrating the surface and creating a chemical bond, Protectosil® CHEM-TRETE® BSM 400 permanently attaches to the substrate. It is ideal for use on exterior above-grade brick masonry, concrete and most natural stones. By reducing the amount of water entering the substrate, Protectosil® CHEM-TRETE® BSM 400 reduces the intrusion of water-borne contaminants such as acid rain, salt and dirt, and reduces the deteriorating effects of these contaminants, including spalling, scaling, efflorescence, leaching and staining.

main benefits
  • Low VOC

  • No masking of windows

  • Lasts 20 years

  • Low-temperature application (20°F)

Transamerica Pyramid Center, San Francisco