ChEBI: Polyoxyl 40 stearate is an octadecanoate ester composed of repeating 8-40 ethyleneoxy units. It is an ingredient used in cosmetics and beauty products primarily as a surfactant and emulsifier. It has a role as a nonionic surfactant, an emulsifier and a food emulsifier. It is a hydroxypolyether and an octadecanoate ester.