... Unsaturated Polyester Resin,.and other industries. 2,Content 99.5%min. Detailed Product Description1,Maleic Anhydride is mainly ... making Unsaturated Polyester Resin,.and other industries. 2,Content 99.5%min. Molecular Formula: C4H2O3Molecular Weight: 98.02Property:It ... carbons, 1,4-butanediol r-butyrolactone, tetrahydrofuran. Content 99.5%min. Melting chromaticity (Pt.Co.) 25max.Freezing point ...