UN1956 COMPRESSED GAS, N.O.S. (SULFUR HEXAFLUORIDE, HYDROGEN) 2.2 100 PPM HYDROGEN, 0.44% OXYGEN, 1.60% NITROGEN, 100 PPM CARBON TETRAFLUORIDE, 100 PPM CARBON DIOXIDE, 100 PPM CARBONYL SULFIDE, 100 PPM DICHLORODIFLUORO- METHANE (R12) 200 PPM SULFUR DIOXIDE, SULFUR HEXAFLUORIDE BALANCE CERTIFIED, SIZE 150AL CUSTOMER OWNED CYLINDER