PEG-9 Polydimethylsiloxyethyl Dimethicone
PEG-9 Polydimethylsiloxyethyl Dimethicone is a silicone-based emulsifier chemically described as a trimethyl-terminated siloxane with polyoxyethylene and dimethylsilyl groups (9 mol EO average molar ratio). It functions primarily as a water-in-silicone emulsifier, enabling water and silicone oils to blend together in formulations. It also carries a secondary skin conditioning function according to CosIng. It is commonly found in foundations, concealers, and sunscreen lotions.
Its primary established benefit is enabling stable water-in-silicone emulsions, which contributes to smooth, lightweight textures in cosmetic formulations. It also provides secondary skin conditioning properties. Its widespread use in makeup and sunscreen products reflects its utility as a formulation-enabling ingredient.
