Pharmaceutical IntermediateChina Supplier Supply CAS No. 89-32-7 Pyromellitic Dianhydride, Pmda Used for Polyimide Film with Factory Price, Find details about China Pyromellitic Dianhydride, Pmda Dianhydride from China Supplier Supply CAS No. 89-32-7 Pyromellitic Dianhydride, Pmda Used for Polyimide Film with Factory Price