We can supply all kinds of high purity gas, such as oxygen,argon, nitrogen, CO2, helium, etc. ... T7445-1995bottle/cylinder Raw material gas, high-altitude weather balloon used in chemical industry.pure Helium≥99.995GB/T4844.2-1995bottle/ ... Pure argon ≥99.99 GB/T4842-95Bottle Welding shielded welding, stainless steel smelting, container, steel structure manufacture, mold processing, etc. High purity ...