China Manufacturer Refined 99.5% Pyromellitic Dianhydride (PMDA), Find details about China Pmda 99.8%, CAS No. 89-32-7 from China Manufacturer Refined 99.5% Pyromellitic Dianhydride (PMDA)
Item | Top Grade | First Grade |
Content | 99.5 %min | ≥98.0 |
CAS NO | 89-32-7 | 89-32-7 |
Appearance | White crystal powder | White crystal |
Melting Point (ºC) | 286-288 | 284-286 |
Free acid content | 0.5 w% max | _____ |