Examples of propellants include low molecular weight hydrocarbons such as propane and butane, alkoxides such as dimethyl ether (i.e., DYMEL?? A from DuPont), chlorofluorocarbons and hydrofluorocarbons such as CFC P-12 and 1,1-difluoroethane (i.e., DYMEL?? 152a from DuPont).