Protectosil® 100 is a free-flowing, colorless, frost resistant, solvent-free liquid based on a monomeric silane. It is specifically intended for the water-repellent treatment of mineral construction materials in outdoor areas. The watervaporpermeable impregnation effectively prevents the penetration of water and dissolved damage-causing salts, such as chlorides. Protectosil® 100 seals hairline cracks of up to 0.3 mm.