... nitrogen ≥99.5GB-T3864-1996CylinderReplacement gas and protection gas for chemical industry, metallurgy, and electric industry.Industrial ... 1995CylinderChemical industry, glasses, synthetic cut stone.Industrial carbon dioxide ≥99.8GB-6052-85CylinderChemical ... /T4842-95CylinderIndustry process, chemical, smelting, protectionPure Nitrogen≥99.996GB/8979-96CylinderChemical industry, glasses, smelting ...