UN1954 COMPRESSED GAS,FLAMMABLE, N.O.S(METHANE,CARBON DIOXIDE)2.1 0.04% PROPANE, 3.0% ETHANE, 4.0% CARBON DIOXIDE, 0.01% ISO-BUTANE, 0.01% ISO-PENTANE, 0.01% HEXANE, 0.04% N-BUTANE, 0.10% NITROGEN, 0.01% N-PENTANE, METHANE BALANCE CERTIFIED, SIZE 200 CUSTOMER OWNED CYLINDER