UN1956 COMPRESSED GAS, N.O.S. (HELIUM,SULFUR HEXAFLOURIDE) 2.2 100 PPM CARBON DIOXIDE, 100 PPM CARBONYL SULFIDE, 100 PPM DICHLORODIFLUOROMETHANE (R-12), 1.60% NITROGEN, 0.43% OXYGEN, 200 PPM SULFUR DIOXIDE, 8% SULFUR HEXAFLOURIDE, 100 PPM TETRAFLUOROMETHANE, HELIUM BALANCE CERTIFIED, SIZE 150AL CUSTOMER OWNED CYLINDER