Sulfur hexafluoride gas is an inorganic compound with the chemical formula SF6. It is a colorless, tasteless, odorless, non-toxic, non-combustible gas at room temperature and pressure. The molecular weight is 146.06 and the density is 6.139 g, which is about 5 times that of air. It is one of the substances with the best known chemical stability, and its inertness is similar to that of nitrogen.
Sulfur hexafluoride gas has excellent thermal stability and does not decompose even at above 500°C in its pure state. The melting point of Sulfur hexafluoride gas is -50.8°C, which can be used as a special refrigerant in the temperature range of -45-0°C. Because of its good heat resistance, it is a stable high-temperature heat carrier.
Sulfur hexafluoride gas has good electrical insulation properties and excellent arc extinguishing performance. Under the same conditions, its electrical strength is 2.5 times that of ammonia, its breakdown voltage is 2.5 times that of air, and its arc extinguishing ability is 100 times that of air. It is a new generation of ultra-high voltage insulating dielectric material that is superior to air and oil. Due to the above and other excellent properties, sulfur hexafluoride has been widely used in the electric power, electronic and electrical industries, laser, medical, meteorological, refrigeration, fire protection, chemical industry, military, aerospace, non-ferrous metallurgy, physics research, etc. in recent years.
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