Organic IntermediateChina Pyromellitic Dianhydride/Pmda/ Benzene-1, 2, 4, 5-Tetracarboxylic Dianhydrid 89-32-7 for Polyimide, Find details about China Pmda for Polyimide, CAS No. 89-32-7 from Pyromellitic Dianhydride/Pmda/ Benzene-1, 2, 4, 5-Tetracarboxylic Dianhydrid 89-32-7 for Polyimide