1,Maleic Anhydride is mainly used for making Unsaturated Polyester Resin,.and other industries. 2,Content 99.5%min ... Product Description1,Maleic Anhydride is mainly used for making Unsaturated Polyester Resin,.and other industries. 2,Content 99.5%min. ... erher,ethyl acelate, etc.Usage:It used in production of unsaturated polyester resin. It also is used in coating, pharmaceutics, agricultural, ...