10,000tons/year CAS NO.: 108-31-6 Assay: 99.5%min Appearance: White or yellowish briquette or flake Use: It used in production of unsaturated polyester resin. It also is used in coating, pharmaceutics, agricultural, surfactant, additive of plastics, etc. It is main material of binary acid with four carbons, 1,4-butanediol r-butyrolactone, tetrahydrofuran.