In normal state, high purity sulfur hexafluoride is a colorless, tasteless, odorless and non-toxic non combustible gas, with a molecular weight of 146.06 and a density of 6.139g/l, about 5 times that of air. It is one of the known substances with good chemical stability, and its inertia is similar to nitrogen. It has excellent thermal stability and does not decompose even above 500 ℃ in pure state.

High purity sulfur hexafluoride has * * * electrical insulation and arc extinguishing characteristics. Under the same conditions, its insulation capacity is more than 2.5 times that of air and nitrogen, and its arc extinguishing capacity is 100 times that of air. The melting point of sulfur hexafluoride is - 50.8 ℃, which can be used as a special refrigerant within the temperature range of - 45-0 ℃. Because of its good heat resistance, it is a stable high-temperature heat carrier. Due to the above and other excellent characteristics, sulfur hexafluoride has been widely used in power, electronics, electrical industry, laser, medical treatment, meteorology, refrigeration, fire protection, chemical industry, military, aerospace, nonferrous metallurgy, physical research, etc. in recent years.

Sulfur hexafluoride has good insulation performance and arc extinguishing performance, such as circuit breaker, high-voltage transformer, gas enclosed combined capacitor, high-voltage transmission line, transformer, etc. Electronic grade high-purity sulfur hexafluoride is an ideal electronic etchant, which is widely used in the field of microelectronics technology. As a refrigerant, the refrigeration range of refrigeration industry can be between - 45 ℃ and 0 ℃. The electrical industry uses its high dielectric strength and good arc extinguishing performance as insulation materials for high-voltage switches, large capacity transformers, high-voltage cables and gases.

The mining industry uses Liming sulfur hexafluoride as a reverse adsorbent to replace oxygen in mine coal dust. High purity SF6 is also widely used in metal smelting (such as magnesium alloy melting furnace shielding gas), aerospace, medical (X-ray machine, laser machine), meteorology (tracer analysis), chemical industry (* * * automobile tires, new type flame arresters), etc. due to its chemical inertness, non-toxic, incombustibility and non corrosiveness. With the development of science and technology, SF6 has been widely used in more and more basic fields and scientific and technological fields.

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