... industry, metallurgy, and electric industry.Industrial hydrogen ≥99.9GB-T3634-1995CylinderChemical industry, glasses, ... Purity Gases Product nameTechnical index(%) StandardUnit ApplicationPure hydrogen ≥99.99GB/T7445-1995CylinderElectronic industry, testingPure ... 9Q/DY01-98CylinderChemical industry, medical, analysisHigh Purity Hydrogen ≥99.999GB/T7445-95CylinderChemical industry, electronic industryHigh ...