UN1954 COMPRESSED GAS,FLAMMABLE, N.O.S. (CARBON DIOXIDE, METHANE) 2.1 0.5% HEXANE, 2% PENTANE, 2% ISOPENTANE, 3% BUTANE, 3% ISOBUTANE, 5% PROPANE, 8.5% ETHANE, 8.5% HYDROGEN, 8.5% ARGON, 8.5% CARBON MONOXIDE, 15% NITROGEN, 15.5% METHANE, 20% CARBON DIOXIDE, CERTIFIED, SIZE LP5AL CUSTOMER OWNED CYLINDER