SF6 gas has been a century, it was two French chemist Moissan and Lebeau in 1900 the synthesis of man-made inert gas, 1940, the U.S. military will use it for the Manhattan Project (nuclear military). 1947 to provide commercial.    
SF6 gas is mainly used for current electricity industry. 4 types of SF6 gas is used as the insulation of electrical equipment and / or interrupter; SF6 circuit breakers and GIS (in this case sulfur hexafluoride enclosed switchgear, internationally known as the "gas-insulated switchgear" (Gas Insulated Switchgear )), SF6 load switch equipment, SF6 insulated transmission lines, SF6 and SF6 insulated substation transformer. 80% for high voltage electrical equipment.