99.9995% helium gas puritystandardunitApplicationoxygen≥99.5GB-T3863-1995bottle/cylinder Steel cutting, welding, flame processingnitrogen≥99.5GB-T3864-1996bottle/cylinderReplacement gas and protection gas for chemical industry, metallurgy, and electric industry.hydrogen≥99.9GB-T3634-1995bottle/cylinderChemical industry, glasses, synthetic cut stone.CO2≥99.8GB-6052-85bottle/cylinderChemical ...