Isohexadecane is part of the paraffin or alkane family of molecules. Alkanes are acyclic saturated hydrocarbon, i.e. molecules made of Hydrogen and Carbon atoms, not forming cycles, only with simple bonds between these atoms.
More precisely, isohexadecane is an isoparaffin, a branched chain hydrocarbon. Isohexadecane contains 16 Carbon atoms.
According to one of its suppliers INEOS, used in cosmetic products, Isohexadecane is a clear, colorless, and odorless liquid providing high emolliency, ease of spreadability and moisturizing properties. It imparts a non-drying feel on the skin and has a light, smooth feel with excellent cleansing characteristics. Applications for use include: face and eye make-up cleansers, skin care, sun care, color cosmetics, bath oils and foundation creams.