Silicones

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Inert, synthetic compounds generally used to improve make product glide smoothly over the skin. Also help prevent transepidermal water loss and absorb excess oils.

Silicones (Wikipedia)
Not to be confused with the chemical element Silicon.
Silicone caulk can be used as a basic sealant against water and air penetration.

Silicones are polymers that include any inert, synthetic compound made up of repeating units of siloxane, which is a chain of alternating silicon atoms and oxygen atoms, frequently combined with carbon and/or hydrogen. They are typically heat-resistant and rubber-like, and are used in sealants, adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation. Some common forms include silicone oil, silicone grease, silicone rubber, silicone resin, and silicone caulk.

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