PEG-15 Pentaerythrityl Tetra(Laureth-6 Carboxylate) is the tetraester of Laureth-6 Carboxylic Acid (q.v.) with a polyethylene glycol ether of pentaerythritol containing an average of 15 moles of ethylene oxide. See Reported Ingredient Functions-The Cosmetic Drug Distinction, in Regulatory and Ingredient Use Information, Volume I, Part A.