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Environmental fate & pathways

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Hydrolysis of sulphur hexafluoride is unlikely to occur as it contains no hydrolysable functional group in its structure.

The atmospheric lifetime of SF6 was estimated by Ravishankara et al. (1993). The reaction of SF6 with O(1D) and the photolysis mediated by Lyman radiation were considered as the possible degradation pathways. The degradation rate coefficient for reaction of SF6 with O(1D) was estimated to be 1.5 x 10 -14 cm3/mol/s (1.80 ± 0.26 x 10 -14 cm3/mol/s). The OH-mediated photodegradation was considered as not relevant.