... cylinder pakage or packed according to demand Name: helium gasPurity: 99.9~99.999%Property: colourless, odourless, non-flammable, non-reactive, ... welding materials that have higher heat conductivity, like aluminium or copper. Minor uses Industrial leak detection One industrial application for ... Name Specification Impurity content (ppm)Carry out Standard Helium(H2) 99.99% O2 +Ar≤3,N2 ≤60,CO≤5,CO2 ≤5 ...