2-Propenoic acid, 2-methyl-, 2-hydroxyethyl ester, homopolymer 25249-16-5 82601-55-6 Glycol methacrylate gel Hydroxymethacrylate gel PHEMA POLYHYDROXYETHYL METHACRYLATE Poly(hydroxyethyl methacrylate) Poly-hema Polyglycol methacrylate