... Gas Mixtures C2H4O,CO2,CCL3F,CCL2F2,Constituent content As Demand4Excimer Laser 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 ...