These versatile materials can bind to a variety of materials including plastics, metal, glass and concrete, and are seal gaps for protection against damage form dirt or water. As a result they are used for many applications including plumbing, window glazing and installing carpets and tiles. The first step in the manufacture of silicones involves reacting elemental silicon with a chlorinated compound called methylchloride. The chemical properties of silicones mean they are water-resistant and maintain their structural integrity over large temperature ranges and on exposure to UV light. They are therefore ideal for outdoor uses such as weatherproofing. Many specialized silicone-based sealants and adhesives have also been developed, including types that can be fast-curing, can protect against mould, or do not stain when used on porous materials. Read more about the silicone-based sealants and adhesives:

• Silicones: Sealants and Adhesives – The art of Bonding (PDF)
• Silicones in Pharmaceutical Applications by André Colas Dow Corning (PDF)

 Read more about "What Are the Different Types of Waterproof Sealant?" on the wisegeek website