... ,CCL2F2,Constituent content As Demand4Excimer Laser Gas Mixturesbalance gas :NeF2,Ar,He,Constituent content As Demand5Laser Gas Mixturesbalance gas :HeH2,N2 ... Demand6Welding shielding gas mixturesbalance gas :He or Ar,N2CO2,H2,O2,N2,He,CH4,Ar,Constituent content As Demand7Keep fresh gas mixtures ...