UN1954 COMPRESSED GAS,FLAMMABLE, N.O.S. (METHANE, ETHANE) 2.1 0.3% HEXANE, 0.1% PENTANE, 0.1% ISOPENTANE, 0.1% NEOPENTANE, 0.3% BUTANE, 0.3% ISOBUTANE, 1.2% PROPANE, 4.0% ETHANE, 0.6% CARBON DIOXIDE, 2.0% NITROGEN, METHANE BALANCE CERTIFIED, SIZE 200 CUSTOMER OWNED CYLINDER