Helium Product number: WT-SG-001 CAS:7440-59-7 Purity: 5N~7N Product specifications: 4L/8L/10L/40L/47L/50L Product form: Helium Main use: Superconductivity and cryogenic research as a coolant, aerospace for rocket fuel system pressurization, medical imaging as a coolant in MRI equipment, semiconductor production as a protective gas, balloon inflation, metal welding.