... production and testing equipments used for gas mixtures gas, the gas preparation and analysis technology achieve the ... Gas Mixturesbalance gas :NeF2,Ar,He,Constituent content As Demand5Laser Gas Mixturesbalance gas :HeH2,N2,CO2,Kr,F,CO,HCL,Constituent content As Demand6Welding shielding gas ... mixturesbalance gas :He or Ar,N2CO2,H2,O2,N2 ...