Application:Sulfur hexafluoride (SF6) is an inorganic, colorless, odorless, and
non-flammable greenhouse gas. SF6 has an octahedral geometry,
consisting of six fluorine atoms attached to a central sulfur atom.
It is a hypervalent molecule. Typical for a nonpolar gas, it is
poorly soluble in water but soluble in nonpolar organic solvents.
It is generally transported as a liquefied compressed gas. It has a
density of 6.12 g/L at sea level conditions, which is considerably
higher than the density of air (1.225 g/L).SF6 is used in the
electrical industry as a gaseous dielectric medium for high-voltage
circuit breakers, switchgear, and other electrical equipment, often
replacing oil filled circuit breakers (OCBs) that can contain
harmful PCBs. SF6 gas under pressure is used as an insulator in gas
insulated switchgear (GIS) because it has a much higher dielectric
strength than air or dry nitrogen.SF6 is used to provide a
tamponade or plug of a retinal hole in retinal detachment repair
operations in the form of a gas bubble. It is inert in the vitreous
chamber and initially doubles its volume in 36 hours before being
absorbed in the blood in 10-14 days.Sulfur hexafluoride was the
tracer gas used in the first roadway air dispersion model
calibration; this research program was sponsored by the U.S.
Environmental Protection Agency and conducted in Sunnyvale,
California on U.S. Highway 101.SF6 plasma is also used in the
semiconductor industry as an etchant. SF6 breaks down in the plasma
into sulfur and fluorine, the fluorine plasma performing the
The magnesium industry uses large amounts of SF6 as inert gas to
fill casting forms.
Sulfur hexafluoride is also used to pressurize waveguides in radar
systems. The gas insulates the waveguide preventing internal
arcing. The same use of sulfur hexafluoride is applied in
transmission waveguides of medical linear accelerators, which are
used for delivery of external beam radiotherapy.
Sulfur hexafluoride has been used in electrostatic loudspeakers
because of its high dielectric strength and high molecular weight.
Sulfur hexafluoride has been used to fill tyres of racing cars in
professional events due to its non-flammability and high density.
Impurity content (ppm)
Air<;200, CF4<;200, Acidity<;0.3, Moisture<;1
Sublimation point = -82.8oF (-63.8oC)
2.5 ft3/lbs at 70oF
Vapor Pressure@70oF (21.1oC)=critical Above
The temperature of -181.1oF (-118.4oC)
Liquid Density at Boiling Point
@59oF (15oC) = 89.83lb/ft3(1439kg/m3)
Gas Density at 70oF. 1 atm
@68oF (20oC) = 0.3847 lb/ft3(6.162kg/m3)
Solubility In Water
Specific Gravity (Air=1)
Appearance And OdorColorless, odorless gas. Liquid is clear, pale blue and odorless.