Isoceteth-20 is a polyethylene glycol ether formed by the ethoxylation of isocetyl alcohol (branched C<sub>16</sub> fatty alcohols); with the general formula HO(C<sub>2</sub>H<sub>4</sub>O)<sub>n</sub>C<sub>16</sub>H<sub>33</sub> where n has an average value of 20. It is a nonionic surfactant used as an oil-in-water emulsifier (e.g. perfume solubilizer), skin cleanser, and in personal care products.