sulfur hexafluoride SF6

As gas insulator ,refrigerant for electronic device,radar waveguide, particle accelerator, transformer, lightning arrestor etc.

*.Full name:

Sulfur hexafluoride,Sulfur fluoride.

*.Application field

As gas insulator ,refrigerant for electronic device,radar waveguide, particle accelerator, transformer, lightning arrestor etc. As tracing device in medical treatment. As etching in semiconductor manufacturing. Standard gas and leak hunting gas for chemical vapor deposition .As carrier gas for chromatograph.

*.Preparation

Prepared by chemical reaction of Sulfur and Nitrogen.

Formula:S+3F2→SF6

 *Physical and chemical prosperities

Physical prosperities	Pressure(Kpa)	Temperature(°C)	Denisty(kg/m³)
Liquid state	/	-50.8	1880
Gaseosness	101.325	0	6.52
Relative Air	101.325	1.20(Gaseosness)	5.114

Chemical prosperities	Pressure(Kpa)	Temperature(°C)
Melting point	224	-50.8
Sublimation Point	101.325	-63.7

Name	Max acceptable concentration
Toxicity	10 ppm(12mg/m³)

Name	Pressure(Kpa)	Temperature	Specific heat
Fusion heat	224	222.35K	34.38
Heat of Vaporization	101.325	-63.8°C	161.61

Name	Pressure(Kpa)	Temperature	Specific heat(J/kg.k)
Liquid	101.325	225K	759.14
Gas	/	25°C	665.18

Name	Temperature(°C)	Pressure(Kpa)
Vapor pressure	-20	680
	0	1250
	30	2680

Viscosity	101.325(kPa,0°C);0.0142mPa.S(Liquid state,229.85K);0.500mPa S
Surface tension	(-50°C):11.63mN/m
Thermal Conductivity	101.325(kPa,0°C):0.01206W/(mK)
Refractive index	(0°C,101.325kPa):1.000783
Solubility in Water	5.4cm 3SF4/kg H2O(SF6 101.325kpa,25°C)
Dielectric Constant	1002049(Gaseosness,101.325kPa,25 °C),At 21.1°C in S.P.for 2308 kPa.

*.Toxicity

Sulfur hexafluoride (SF6) was taken as inert gas in pharmacology. But once contained with SF4,it will be toxic. If people inhalt with high concentration SF6, they will have a series of suffocation symptom,such as difficult to breath , skin and mucous membrane turning to blue and general convulsive seizure.

* .Safety

Gas container can be leak hunting by soap water. SF6 is non-corrosiveness ,hence it can be contained by stainless,copper,aluminium. Once on fire, it is okay to put off by water and sand. Mixture water with sodium hydroxide and slaked lime can deal with leak gas or just put the leak container into exhaust locker.

sulfur hexafluoride SF6