... oxygen gas of purity 99%, 99.9%, 99.99% and 99.999% Pure Gases,High Purity GasesProduct nameTechnical index(%) StandardUnit ApplicationPure hydrogen ... /DY01-98CylinderChemical industry, medical, analysisHigh Purity Hydrogen ≥99.999GB/T7445-95CylinderChemical industry, electronic ... industry, electronic industry, lamp, analysisHigh Purity Oxygen ≥99.999GB/T14599-93CylinderCutting, electronic industry, ...