UN1954 COMPRESSED GAS,FLAMMABLE, N.O.S. (METHANE, ETHANE) 2.1 0.5% BUTANE, 1% CARBON DIOXIDE, 5% ETHANE, 0.035% N-HEPTANE, 0.048% N-HEXANE, 0.4% ISOBUTANE, 0.25% ISOPENTANE, 1% NITROGEN, 0.017% N-OCTANE, 0.25% N-PENTANE, 1% PROPANE, METHANE BALANCE CERTIFIED, SIZE 150AL CUSTOMER OWNED CYLINDER