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Sulfur hexafluoride gas (SF6) gas properties
Heavy, chemically inert, non toxic
No poisonous effect on the human body but decomposition products are poisonous
Color less and odor less
It is gaseous at normal room temperature and pressure
Density is about 6.6g/l at 20oC (5 times denser than air)
Critical temperature is at 45.6oC and can be liquefied by compression
Very good insulant with high dielectric strength
SF6 gas is electo-negitive ( tends to attract the free electrons and has the arc quenching property). Because of this main reason SF6 gas is used for arc quenching and insulation medium in circuit breakers.
The gas is highly stable
Unlike solid insulation materials, electrical breakdown of sf6 gas does not result in permanent deterioration of its properties
Decomposition occurs on the exposure to the electric arc. (Disassociation products will be SF2 and SF4 lower order fluorides)