... 1996BottleReplacement gas and protection gas for chemical industry,metallurgy, and electric industry.Pure nitrogen ≥99.996GB/8979-96BottleChemical industry, glasses, metallurgy, protectionIndustrial hydrogen ... air balloon.Pure helium ≥99.995GB/T4844.2-1995 BottleElectronic industry, chemical industry, analysisDissolved acetylene ≥98GB6819-1996BottleWelding, cutting, heating, organic raw ...