The ability of SF₆ to recombine after arcing events — combined with the fact that it is chemically inert, non-toxic in its pure state, non-flammable, and very-high density — makes it an excellent di-electric gas, and sulfur hexafluoride has been used as an insulating medium in the electrical industry since the 1950s. SF6 GAS ENVIRONMENTAL IMPACT SF₆ is a man-made …