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Chemical Name: α-BPDA Synonyms: 2,3,3,4-biphenyl tetracarboxylic dianhydride CAS No.: 36978-41-3 Molecular Formula: C16H6O6 Molecular Weight: 294.21 Appearance: White Powder Density: 1.406g/cm3 Melting point: 196-198 Metal Impurities: K,Ca,Na,Fe,Cu≤2PPM