Physics and chemical property:
It is white monoclinic crystal, has smell like camphor. Relative density is 0.8918(15Celsius degree/15Celsius degree). Melting point is 79.2Celsius degree, boiling point is 196.8Celsius degree, and flash point is 73Celsius degree(open). It can dissolve inethanol, aether and benzene, not dissolve in water. It is easy to sublime, can volatilize with vapour and easy to burnt. The oxide is pyromellitic acid or pyromellitic dianhydride.

Purpose:
The product is mainly used for synthesizing pyromellitic dianhydride, producing polyimide resin, dyestuff, plasticizer, surfactant, delustrant, curative and otherwise.