1-Chloro-1-fluoroethylene2317-91-1100 % similar Polyvinylidene fluoride24937-79-931 % similar 1,2-Dichloro-1,2-difluoroethene598-88-931 % similar 1,1-Dichloroethene75-35-431 % similar 1,1-Difluoroethene75-38-731 % similar