SILRES® BS 16 is an aqueous solution of potassium methyl siliconate and is used in diluted form for impregnation mineral construction materials to make them water-repellent.SILRES® BS 16 develops its water-repellent properties by reaction with atmospheric carbon dioxide (CO2).The active substance formed from the silicone masonry water repellent is polymethylsilicic acid.
As with all siliconates, however, SILRES® BS 16 can cause a white deposit on the surface of colored construction materials.
Imparting water repellency to:
- Low-fired clay products immediately after they have been made: e. g. roof tiles, facing bricks, floor tiles, flower pots
- Aerated concrete
- Gypsum and gypsum-based plasterboards
- Light fillers, such as perlite, vermiculites and aerated concrete granules
- Insulating materials
Diluted with water SILRES® BS 16 is used for impregnating the surface of masonry materials when a suitable means of achieving an adequate, uniform coating e.g. dipping, is available. The product is not recommended for treating the outside walls of buildings since the necessarily uneven application will give rise to white spots.
SILRES® BS 16 should be stored in iron drums, plastic or glass containers. Tinplate, aluminium or galvanized or lacquered containers are not suitable. In the sealed container, SILRES® BS 16 has a shelf life of at least 12 months, both in its concentrated and diluted form. Storage temperatures should not drop below – 80 °C.If crystals form due to too low storage temperatures, these will redissolve when the product is allowed to warm up. The product must then be stirred thoroughly. The diluted product should always be stored at a temperature above 0 °C. The ‘Best use before end’ date of each batch appears on the product label.
If the material is kept beyond the shelf life recommended it is not necessarily unusable, but a quality control should be performed on the properties relevant to the application.
SILRES® BS 16 is supplied as a concentrate and is diluted with water before use. Ordinary tap water may be used. It is best to add the SILRES® BS 16 masonry water repellent to the water with vigorous stirring.
SILRES® BS 16 is strongly alkaline and corrosive both as a concentrate and in its diluted form. Goggles should always be worn when handling the product. Any splashes on the skin should be washed off with plenty of water. If any of the product gets into eyes, wash them immediately with plenty of water and seek medical advice because of the effect of the corrosive alkali. Clothing wetted with SILRES® BS 16 must be taken off immediately.