UN1075 PETROLEUM GASES,LIQUEFIED 2.1 0.15% METHANE, 0.50% ETHANE, 0.10% ETHYLENE, 0.50% PROPANE, 0.01% CYCLOPROPANE, 0.10% PROPYLENE, 35.00% ISOBUTANE, 0.10% PROPADIENE, 0.20% TRANS-2-BUTENE, 0.40% 1-BUTENE, 0.30% ISOBUTYLENE, 0.10% CIS-2-BUTENE, 0.05% NEOPENTANE, 0.05% ISOPENTANE, 0.10% N-PENTANE, 0.10% 1,2-BUTADIENE, 0.20% 1,3-BUTADIENE, 0.015% 1-PROPYNE (METHYL ACETYLENE), 0.01% 3-METHYL-1-BUTENE, 0.015% ETHYL ACETYLENE, 0.05% N-HEXANE, 0.10% BENZENE, 0.055% ACETYLENE, N-BUTANE BALANCE CERTIFIED, 1000CC PISTON LIQUID PHASE CUSTOMER OWNED CYLINDER