Protectosil® CHEM-TRETE® PB 350 is a clear, reactive, penetrating sealer for use on exterior above-grade concrete masonry units, brick masonry and most natural stones. This product provides resistance against water, alkali attack, acid rain and waterborne staining by penetrating into the substrate and chemically bonding with siliceous materials to form a permanent attachment of the water repellent molecule. Protectosil® CHEM-TRETE® PB 350 is especially suited for making porous substrates, such as split-face block, water repellent. This water repellent effect stands up against winddriven rain. By penetrating the surface and creating a covalent chemical bond, Protectosil® CHEM-TRETE® PB 350 will prevent waterborne contaminants from entering the substrate, reducing problems such as efflorescence, leaching, acid rain deterioration, scaling, dirt buildup, staining, corrosion of reinforcing steel and mildew. Protectosil® CHEM-TRETE® PB 350 will not cause adverse surface appearance of the substrate. Treated surfaces are fully breathable because the natural moisture vapor transmission is not affected. This will eliminate problems caused by entrapped moisture, including blushing of the sealer and freeze-thaw damage to the masonry.
Typical Applications
Benefits at a glance
The main benefits of the product are:
• High resistance to wind-driven rain
• Excellent resistance to chloride ion ingress
• Reduced efflorescence
• Breathable system
• Deep penetration into substrate
• High resistance to alkali attack
• Long service life
• Substrates already treated with Protectosil® CHEM-TRETE® PB 350 can be painted over
• Keeps substrates cleaner