... Replacement gas and protection gas for chemical industry, metallurgy, and electric industry.Pure nitrogen ≥99.996 GB/8979-96Bottle ... 99.995 GB/T4844.2-1995 Bottle Electronic industry, chemical industry, analysis Dissolved acetylene ≥98 GB6819-1996Bottle Welding, cutting, heating, organic ... Sulfur dioxide 99.97 ISBT Kg Food grade Sulfureted hydrogen 99.8 Q/XSHJ08-1996 Kg Industry grade Industrial gas