C12-13 Alketh-9
C12-13 Alketh-9 (formerly C12-13 Pareth-9) is a polyethylene glycol ether of a mixture of synthetic C12-13 fatty alcohols with an average of 9 moles of ethylene oxide. It is a synthetic, ethoxylated fatty alcohol derivative registered under CAS numbers 66455-14-9 and 160901-19-9. According to CosIng, its official function is as a surfactant-emulsifying agent. It appears across a range of rinse-off and leave-on formulations including cleansers, shampoos, tonics, and serums.
Primarily functions as a surfactant-emulsifier, helping to blend oil and water phases in cosmetic formulations. Its ethoxylated structure contributes to its ability to stabilize emulsions and aid in cleansing. No direct skin-benefit claims are supported by the source text.
