... 1,Maleic Anhydride is mainly used for making Unsaturated Polyester Resin,.and other industries. 2,Content 99.5 ... Product Description1,Maleic Anhydride is mainly used for making Unsaturated Polyester Resin,.and other industries. 2,Content 99.5%min ... of unsaturated polyester resin. It also is used in coating, pharmaceutics, agricultural, surfactant, additive of plastics, etc. It is main material of ...