Sulfur hexafluoride is routinely used as a tracer gas in laboratory fume hood containment testing. The gas is used in the final stage of ASHRAE 110 fume hood qualification. As with helium, a person trained by an expert can breathe a small quantity of sulfur hexafluoride without harm to demonstrate how sound travels through a very dense gas.
Approximately 80% of the annual consumption of SF6 is used for gas insulated substation equipment and medium voltage switchgear including circuit breakers and load break switches.
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