Sulfur Hexafluoride

Chemical formula: SF6

CAS login No.: 2551-62-4

Appearance: colorless gas

Molecular weight: 146.05

Purity: 99.995%

Package: 40L

Net weight of gas: 50kg

SF6 package specification:

SF6 gas description

Sulfur hexafluoride is a colorless, odorless, nontoxic and incombustible stable gas. Its molecular weight is 146.07, and its density is 6.1kg/m3 at 20 ℃ and 0.1 MPa, about 5 times that of air. Sulfur hexafluoride is gaseous under normal temperature and pressure. Its critical temperature is 45.6 ℃, the three-phase point temperature is -50.8 ℃, and the sublimation point temperature under normal pressure is -63.8 ℃. The molecular structure of sulfur hexafluoride is octahedral, with small bonding distance and high bonding energy, so its stability is very high. When the temperature does not exceed 180 ℃, its compatibility with electrical structural materials is similar to that of nitrogen.

Main uses of sulfur hexafluoride

1. A new generation of ultra-high voltage dielectric materials. As a good gas insulator, it is widely used in the gas insulation of electronic and electrical equipment. Electronic grade high-purity sulfur hexafluoride is an ideal electronic etchant, which is widely used in the field of microelectronics technology as a plasma etchant and cleaning agent in the manufacture of large-scale integrated circuits such as computer chips and liquid crystal screens. It is used as a fluorine source for the production of fluorine doped glass in the preparation of optical fibers, and as a dopant for the isolation layer in the manufacture of low loss high-quality single-mode optical fibers. It can also be used as doping gas for nitrogen excimer lasers. Used as tracer, standard gas or preparation of standard mixture in meteorological, environmental testing and other departments. It is used as insulation material for arc extinguishing and large capacity transformer in high voltage switch. It can also be used in particle accelerators and lightning arresters. Because of its good chemical stability and no corrosion to equipment, it can be used as a refrigerant in the refrigeration industry (operating temperature - 45~0 ℃). Due to α Particles have a high stopping power and are also used in radiochemistry. In addition, it is also used as a kind of reverse adsorbent to replace oxygen from coal dust.

2. It can be used for smelting and casting of non-ferrous metals, as well as degassing and purification of molten aluminum and its alloys. In the microelectronics industry, sulfur hexafluoride can be used to etch the silicon surface and remove organic or inorganic films on semiconductor materials, and can be used as a dopant for the isolation layer of single film optical fiber in the manufacturing process of optical fiber. The current interrupter added with sulfur hexafluoride has high rated voltage and is not easy to burn. In addition, sulfur hexafluoride is also used in various accelerators, ultra-high voltage accumulators, coaxial cables and microwave transmission insulation media. At present, sulfur hexafluoride is a widely used tracer for the determination of air pollution, and the tracer distance can reach 100km. Sulfur hexafluoride has good chemical stability and no corrosion to equipment. It can be used as a refrigerant (operating temperature is between -45 ~ 0 ℃) in the refrigeration industry to replace freon as a refrigerant. It has no destructive effect on the ozone layer and meets the requirements of environmental protection and service performance. It is a refrigerant with great development potential. It is used as electrical insulation medium, arc extinguishing agent and tracer for measuring the degree of air pollution.

3. It is mainly used for arc extinguishing in high-voltage switches and used as insulating material in large capacity transformers and high-voltage cables. It can be used as gas insulation material in nuclear particle accelerator and lightning arrester X-ray equipment. SF6 has good chemical stability and is not corrosive to equipment. It can be used as refrigerant in the refrigeration industry (operating temperature is between -45 ~ 0 ℃) α- Particles have high stopping ability, so they are also used in radiochemistry; It can also be used as a reverse adsorbent to replace oxygen from coal dust.

4. Gas insulator used as electronic equipment and radar waveguide.