Silicones are polymers with a siloxane bond (≡Si-O-Si≡) backbone composed of silicon and oxygen. They have extremely useful characteristics, including resistance to heat, cold and weather, electrical insulation, chemical stability and water-repellence. They can also be used as antifoaming agents and mold lubricants. Silicones can be produced in an extremely diverse range of formats, such as oils, emulsions, resins, varnishes, rubbers and powders. They are used in many applications, including commodities such as cosmetics, paper, fibers, plastics, and industrial applications such as electronic and electrical devices, automobiles, machinery, construction and civil engineering.