露脸国产精品自产在线播,99精品视频在线免费观看,91九色在线,91bt.vip,欧美极品在线播放,国产一级一片免费播放i,国产精品冒白浆免费视频

1.Product Name：Pyromellitic dianhydride(PMDA)

2.CAS NO.:89-32-7

3. Structural Formula: 

4. Molecular Formula: C₁₀H₂O₆ 

5. Quality indexes:

6.PACKING AND RESERVATION
External Package is plastic barrel or Fiber Drum (or use iron barrel according to customer's request), 20-200kg/barrel. Internal Package is polyethylene cuticle bag, Store in shady and dry place,and keep off heart sourc
e