... %, 99.9%, 99.99% and 99.999% Pure Gases,High Purity GasesProduct nameTechnical index(%) StandardUnit ApplicationPure hydrogen ≥99.99GB/T7445-1995CylinderElectronic ... /T8980-96CylinderElectronical industry, smelting, analysisHigh Purity CO2 ≥99.9995Q/DY03-98CylinderElectronical industry, medicalHigh Purity Acetylene ≥99.9Q/DY05-98CylinderWelding, chemical HIGH PURITY OXYGEN GAS