CAS 9003-27-4 appears in our catalog under these names: Polyisobutylene, Polyisobutylene Mw 1200-1400, POLYISOBUTYLENE, AVERAGE MV CA. 420,000, Polyisobutylene average Mv ~1,200,000. Offered by: Biosynth, Ambeed, Sigma-Aldrich. Available pack sizes: 2kg, 5kg, 100g, 500g, 1000g, 250G.