CAS 25135-51-7 appears in our catalog under these names: Polysulfone resin, pellets, approx. M.W. 60,000, Poly[oxy-1,4-phenylenesulfonyl-1,4-phenyleneoxy-1,4-phenylene(1-methylethylidene)-1,4-phenylene] average Mw ~35,000, POLYSULFONE, AVERAGE MW CA. 35,000, POLYSULFONE, AVERAGE MN CA. 22,000 (MO), Poly[oxy-1,4-phenylenesulfonyl-1,4-phenyleneoxy-1,4-phenylene(1-methylethylidene)-1,4-phenylene], average Mw ~35,000. Offered by: Thermo Scientific (Acros), Ambeed, Sigma-Aldrich. Available pack sizes: 5g, 250g, 1000g, 100G, 500G, 1g, 25g, 1kg.