... -2-Butenoic acidDensity:1.027Melting point:69-73 degreesboiling point:185-199 degreesflash point:88 degreessolubility:94g/Lspecification:Assay:99.5%Moisture:0.5 ... mask material);Export market:europe,America,Asia. Crotonic acid, trans-2-Butenoic acid,99.5%,raw material for Cosmetics, Resin, Coating,Plasticizer