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Professional Manufacture Gas Hydrogen Gas Price 40L 47L Hydrogen Gas for Industrial. Versatile Industrial Applications: Used in space propulsion, welding, semiconductor purification, and petroleum refining. Certified Quality Control: ISO9001:2015 and ISO14001:2015 certified for quality and environmental management. Stable Supply Chain: Two factories with excellent equipment ensure consistent product supply. Customizable Specifications: Available in 40L/47L cylinders with 13.5MPa pressure and 99.999% purity.