... cylinder pakage or packed according to demand Name: helium gasPurity: 99.9~99.999%Property: colourless, odourless, non-flammable, non-reactive, inert ... 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 ...