... ≥99.5GB-T3863-1995bottle/cylinder Steel cutting, welding, flame processingnitrogen≥99.5GB-T3864-1996bottle/cylinderReplacement gas ... 99.99GB/T7445-1995bottle/cylinder Raw material gas, high-altitude weather balloon used in chemical industry.pure ... analysis Pure argon ≥99.99 GB/T4842-95Bottle Welding shielded welding, stainless steel smelting, container, steel structure manufacture, ...