Argon gas Pure argon: GB / T4842 - 1995 (O2≤2 THC≤2 N2≤5 H2≤1 H2O≤4b)High purity argon: GB ... flame processingnitrogen≥99.5GB-T3864-1996bottle/cylinderReplacement gas and protection gas for chemical industry, metallurgy, and ... gas, high-altitude weather balloon used in chemical industry.pure Helium≥99.995GB/T4844.2-1995bottle/cylinder Electronic industry, chemical industry, analysis pure Argon gas ...