UN1954 COMPRESSED GAS,FLAMMABLE, N.O.S. (ETHANE, PROPANE) 2.1 0.25% N-HEXANE 0.25% ISO-PENTANE 0.25% N-PENTANE 0.5% CARBON DIOXIDE 1.0% ISO-BUTANE 1.0% N-BUTANE 1.0% METHANE 4.0% NITROGEN 30.0% PROPANE 40.0% ETHANE 21.75% HELIUM PRIMARY, SIZE 350 CUSTOMER OWNED CYLINDER