... nameTechnical index Implementing standardunit ApplicationIndustrial oxygen ≥99.6 GB-T3863-1995Bottle Steel cutting, welding, flame processingIndustrial ... metallurgy, and electric industry.Pure nitrogen ≥99.996 GB/8979-96Bottle Chemical industry, glasses, metallurgy, protection ... Industrial hydrogen ≥99.9 GB-T3634-1995Bottle Chemical industry, glasses, synthetic cut stone ...