... ,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,He,CH4,Ar,Constituent content As Demand7Keep fresh gas ... gas :N2CO2,CO,C3H8,Constituent content As Demand9Zero Air CO2,CO,NO,O2,N2,Constituent content As Demand various components Gas Mixtures ...