Our company is the manufactory of ODPA. 4,4'-Oxydiphthalic Anhydride (ODPA) CAS No：1823-59-2 purity:98.0%MIN ODPA is an almost white, crystallinic freely flowing powder. The ODPA is mainly used for producing transparent high performance polyimide that exhibit excellent thermal oxidative stability, radiation resistance, chemical resistance, wear resistance and flame retardance with low smoke generation. It can be applied in fields of composite, foams, adhesives, moulded parts, films, microelectronics and gas separation membranes etc. It can also be as epoxy latent curing agent in form of microcapsules.