... Crotonic acid, trans-2-Butenoic acidDensity:1.027Melting point:69-73 degreesboiling point:185-199 degreesflash point:88 degreessolubility:94g/Lspecification:Assay:99.5 ... , cosmetics(facial mask material);Export market:europe,America,Asia. Crotonic acid, trans-2-Butenoic acid,99.5%,raw material for Cosmetics, Resin, Coating,Plasticizer