Description:
Protectosil® 40 S is a silane based free-flowing, colorless liquid. It is specifically intended for the water-repellent impregnation of absorbent mineral facade construction materials. Protectosil® 40 S is supplied in ethanolic solution ready for application.

Usage:
The substrates to be treated should be dry and clean in order to ensure deep penetration of the active ingredient. During application the outside temperature and the temperature of the substrate should be within the range from 0°C to 40°C. The material should not be applied if there is a strong wind or if it is raining. The material must not come into contact with water either before or during use.

Protectosil® 40 S must be applied by flow-coating to the saturation point. This is achieved by allowing it to flow without pressure against the surface to be treated. All liquid delivery devices are suitable (airless sprayguns, for example). The material must not be atomized or applied with a brush. Protectosil® 40 S must remain in contact with the substrate for several seconds as a liquid film. Horizontal surfaces should have a shiny, wet appearance for 3-5 seconds. Vertical surfaces should exhibit a 30-50 cm shiny curtain of liquid.

All equipment and containers must be clean and dry. After use they can be cleaned with any organic solvent (methylated spirit, petrol or thinners). Non-absorbent substrates such as, for example, glass, wood, plastic and metal cannot be treated with Protectosil® 40 S. Glass, wood and metal are not attacked by Protectosil® 40 S. Neither are most plastics used in construction. Therefore covering is normally not necessary. To make it sure we recommend to carry out a test. In the worst case, product not absorbed by the substrate may react with atmospheric moisture to form a greasy, glossy silicone resin film, which can easily be removed if cleaned immediately using conventional cleaning agents, or alcohol.

Protectosil® 40 S reacts with the interfaces in pores and capillaries of the mineral surface and forms invisible, water-repellent interfacial compounds. However, since it is frequently unknown whether the material has been previously treated, and the exact type of treatment, a test should always be performed on a small area to make sure that no undesired secondary phenomena occur. Plants in the vicinity of the substrate to be treated should be protected against contact with Protectosil® 40 S.