... 99.9%, 99.99% and 99.999% Pure Gases,High Purity GasesProduct nameTechnical index(%) StandardUnit ... .99GB/T4842-95CylinderIndustry process, chemical, smelting, protectionPure Nitrogen≥99.996GB/8979-96CylinderChemical industry, glasses, smelting, ... 9996GB/T10624-95CylinderMulti gases mixture, electronical industryHigh Purity Nitrogen ≥99.9996GB/T8980-96CylinderElectronical industry, smelting, ...