The electrical power industry used about 80% of the sulfur hexafluoride produced in 2000, mostly as a gaseous dielectric medium. It does not react with molten sodium below its boiling point, but reacts exothermically with lithium. A main contribution to the inertness of SF 6 is the steric hindrance of the sulfur atom, whereas its heavier group 16 counterparts, such as SeF 6 are more reactive than SF 6 as a result of less steric hindrance (See hydrolysis example). There is virtually no reaction chemistry for SFĦ. Uses in magnesium, aluminium, and electronics manufacturing also hastened atmospheric growth. The increase over the prior 40 years was driven in large part by the expanding electric power sector, including fugitive emissions from banks of SFĦ gas contained in its medium- and high-voltage switchgear.
Its concentration in Earth's troposphere reached 10.63 parts per trillion (ppt) in 2021, rising at 0.39 ppt/year. It is generally transported as a liquefied compressed gas.Ħ is 23,500 times more potent than CO 2 as a greenhouse gas but exists in relatively minor concentrations in the atmosphere. It has a density of 6.12 g/L at sea level conditions, considerably higher than the density of air (1.225 g/L). It is a hypervalent molecule.Ħ is poorly soluble in water but quite soluble in nonpolar organic solvents. SFĦ has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom. It is a colorless, odorless, non- flammable, and non-toxic gas. Sulfur hexafluoride or sulphur hexafluoride ( British spelling) is an inorganic compound with the formula SF 6.
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