... ≥99.9GB-T3634-1995CylinderChemical industry, glasses, synthetic cut stone.Industrial carbon dioxide ≥99.8GB-6052-85CylinderChemical industry, welding, casting moldIndustrial helium ... , protectionPure Nitrogen≥99.996GB/8979-96CylinderChemical industry, glasses, smelting, protectionCarbon Monoxide ≥99.9Q/DY01-98CylinderChemical industry, medical, analysisHigh Purity Hydrogen ≥99 ...