CAS 25608-63-3 appears in our catalog under these names: POLY(OXY-1,4-PHENYLENESULFONYL-1,4-PHEN&, 4,4′-Dichlorodiphenyl sulfone-4,4′-dihydroxydiphenyl sulfone copolymer. Offered by: Sigma-Aldrich, Chemat. Available pack sizes: 50G, 1g, 5g, 25g, 100g.