These are long chain polymers with a backbone of alternating silicon and oxygen molecules. The chemical bonds within these polymers are much stronger than those of the hydrocarbon polymers and give silicones very different and useful characteristics. They are highly water-repellent and are used in some of the Nikwax products, though not as a single active ingredient (i.e. none of the products relies purely on silicones for their effect).

Caulking compounds, plastics, rubbers., Very stable and inert, low toxicity. Potential toxicity comes from additives.

Mineral based, these are a family of ingredients that are emollient and leave a protective film on the surface of the skin that helps to protect the skin from dehydration. They also allow a product to spread easily.

Compounds made from silicon and oxygen, two of the most common elements on the surface of the earth. Silicones can take a variety of physical forms, ranging from solids to water-thin liquids and semi-viscous pastes, greases and oils.

A family of polymeric materials containing the Si-O chemical group in their structure; the most widely used silicones are elastomeric adhesives and sealants capable of service over the exceptionally wide temperature range of –100°F to over 500°F. Both one and two component silicone compounds are available.

inert, nonreactive substances derived from silica or sand, they are popular in hair styling aids and, at one time, were used in breast implants. They are the words with a "-cone" ending on ingredients labels; examples are dimethicone and cyclomethicone.

Polymeric organosilicon compounds; contain individual or cross-linked Si-O chains or rings in which some oxygens of SiO4 tetrahedra are replaced by other groups.

Organic compound of silicone. A water repellant or paint modifier.

Resins consisting of silicon-oxygen linkages, unlike organic resins, which contain carbon.