UN1956 COMPRESSED GAS, N.O.S. (HELIUM, CARBONYL SULFIDE) 2.2 91.5 PPB DIMETHYL SULFIDE, 29.5 PPB ISOPROPYL MERCAPTAN, 94.5 PPB THIOPHENE, 94.5 PPB CARBONYL SULFIDE, 7.50 PPB HYDROGEN SULFIDE, 36.0 PPB METHYL MERCAPTAN, 33.0 PPB ETHYL MERCAPTAN, 26.5 PPB TERT-BUTYL MERCAPTAN, 39.5 PPB N-PROPYL MERCAPTAN, 37.0 PPB ISOBUTYL MERCAPTAN, 34.5 PPB N-BUTYL MERCAPTAN HELIUM BALANCE CERTIFIED, SIZE 40 STEEL SILCONERT CYLINDER CUSTOMER OWNED CYLINDER