Silicone Based Water Repellents from Dow Corning, USA :
[Manufactured by: Dow Corning, USA]

Water repellents from Dow Corning are available for use in formulations that penetrate a broad range of substrates, including:

Poured-in-place or precast concrete Concrete block Sandstone/Granite Limestone/Marble Brick/Tile Wood They extend the life of substrates for years in the toughest environments by providing a variety of benefits, including: Excellent water repellency UV stability Reduced efflorescence Water vapor permeability Clear, uniform, neutral appearance Reduced freeze-thaw damage Long-term durability

Dilute formulations of Dow Corning water repellents can be easily applied by dipping, spraying or brushing.

Following are the most important grades of Dow Corning water repellents, which are available with us:

Dow Corning® Z-6689 Water Repellent

Dow Corning® Z-6689 Water Repellent is a solvent-free silane/siloxane concentrate, dilutable in organic or silicone solvents to formulate a water repellent. Upon proper application, the formulated product will penetrate and provide water repellency by chemically reacting with the substrate. Treated substrates are hydrophobic and retain their original appearance. A catalyst is present, so it can be used on both neutral and alkaline substrates.

The active ingredients react with moisture to produce hydroxy groups. These hydroxy groups will bond with the substrates and themselves to produce a hydrophobic treatment that inhibits water absorption into the substrate.

Applications
For use on neutral and alkaline mineral substrates such as brick, sandstone, concrete and mortar that require water repellency.

Dow Corning® 520 Dilutable Water Repellent Emulsion

Dow Corning® 520 Dilutable Water Repellent Emulsion is a 40 percent active silane/siloxane emulsion. It can be used at 40 percent actives or can be diluted in water to formulate a water repellent. As with any other common water repellent, upon proper application, the formulated product will penetrate and provide water repellency by chemically reacting with the substrate. Treated substrates are hydrophobic and retain their original appearance.

The active ingredients in Dow Corning 520 Dilutable Water Repellent Emulsion are small molecules to allow for deep penetration into the surface. After the emulsion breaks, the active ingredients react with moisture to produce hydroxy groups. These hydroxy groups bond with the substrate and each other to produce a hydrophobic treatment that inhibits water absorption into the substrate. However, in the emulsion form, surfactants protect the reactive molecules from the water, providing emulsion stability.

Applications
For use on mineral substrates such as brick, stone, concrete and mortar that require water repellency.

Dow Corning® 772 Water Repellent

Dow Corning® 772 Water Repellent is a nonflammable, water soluble sodium methyl siliconate solution designed to impart water repellency to a wide variety of surfaces. Supplied at a concentration of 30 percent solids in water, Dow Corning 772 Water Repellent is usually diluted to a concentration of 3 percent before being applied. The final concentration depends on the application. The siliconate reacts with moisture and carbon dioxide in the air to form an insoluble water-resistant resin within 24 hours.

Applications

For more information on Dow Corning Water Repellents, please visit www.dowcorning.com