Bulk and Prepack available | Aldrich-181978; average Mn ~60,000 by GPC, average Mw ~750,000 by LS, 50 wt. % in H2O; Ethyleneimine polymer | PEI; CAS No. 9002-98-6 (principal component); Explore related products, MSDS, application guides, procedures and protocols at Sigma Aldrich - a one stop solution for all your research & industrial needs.