UN1954 COMPRESSED GAS,FLAMMABLE, N.O.S. (METHANE, ETHANE) 2.1 0.5% N-HEXANE, 0.4% ISO-PENTANE, 0.6% N-PENTANE, 0.3% NEO-PENTANE, 0.4% ISO-BUTANE, 0.6% N-BUTANE, 2.5% PROPANE, 50PPM CARBON DIOXIDE, 5% NITROGEN, 5% ETHANE, METHANE BALANCE CERTIFIED, SIZE 150AL CUSTOMER OWNED CYLINDER