Sulfur Hexafluoride

Made by industry; leaks or releases during use of gas‑insulated switchgear/circuit breakers, magnesium casting, semiconductor processing, tracer tests, and some imaging agents; toxic breakdown products can form during electrical arcing [1][2].

Mainly by breathing air at work during equipment filling, testing, or maintenance; the general public has very low exposure. Contact with the liquefied gas can cause frostbite; confined spaces pose the greatest danger [1][3].

Health—high levels can cause dizziness, unconsciousness, and death from lack of oxygen; breakdown products can irritate the eyes and lungs. Environment—about 23,500× the warming power of CO2 and lives thousands of years in air [1][2].

Utility and substation workers; magnesium and semiconductor workers; technicians using SF6 as a tracer; people entering pits, vaults, or small rooms where gas can build up [1][3].

Ensure ventilation and leak checks, monitor oxygen, capture/recycle gas, and follow confined‑space procedures. Utilities can switch to lower‑GWP alternatives and reduce leaks [2][3].