Functional TextileChina High Quality Stabilizer Functional Materials 1 2 4 5-Benzenetetracarboxylic Dianhydride Pyromellitic Dianhydride (PMDA) CAS No. 89-32-7, Find details about China Pyromellitic Dianhydride, Pmda Dianhydride from High Quality Stabilizer Functional Materials 1 2 4 5-Benzenetetracarboxylic Dianhydride Pyromellitic Dianhydride (PMDA) CAS No. 89-32-7