Sulfur hexafluoride - Wikipedia

Typical for a nonpolar gas, SF 6 is poorly soluble in water but quite soluble in nonpolar organic solvents. It has a density of 6.12 g/L at sea level conditions, considerably higher than the density of air (1.225 g/L). It is generally transported as a liquefied compressed gas.Get price

The decomposition products of sulfur hexafluoride (sf6 gas

Nov 01, 2007 · The compounds formed in the SF 6 decomposition may include S 2 OF 10, CF 4, COF 2, F 2, HF, H 2 S, NF 3, F 2 O, SiF 4, SO 2, S 2 F 10, SF 4, SO 2 F 2, SOF 2, SOF 4 and S 2 O 2 F 10, , , , , , , , , . Although the occupational exposure limit is not commonly used as a relative index of toxicity for chemicals, the information is the most commonGet price

Sulfur hexafluoride | F6S - PubChem

Sulfur hexafluoride is a sulfur coordination entity consisting of six fluorine atoms attached to a central sulfur atom. It is the most potent greenhouse gas currently known, with a global warming potential of 23,900 times that of CO2 over a 100 year period (gaz sf6 has an estimated lifetime in the atmosphere of between 800 and 3,000 years).Get price

Sulfur Hexafluoride sf6 gas Safety Data Sheet SDS P4657

Decomposition temperature : No data available Flammability (solid, gas) : No data available Vapor pressure : 2100 kPa Critical pressure : 3760 kPa Relative vapor density at 20 °C : No data available Relative density : 1.4 Relative density of saturated gas/air mixture : 5.04 Specific gravity / density : 0.0061 g/cm³ (at 20 °C)Get price

Decomposition of sf 6 in an RF Plasma Environment

duced the electron density and, thus, reduced the dis-sociation of SF 6 and inhibited the production of free radicals. However, when the input power exceeded 40 W, η insulating gas was not affected by the feed O 2 /SF 6 ratio, lead-ing to more than 99% decomposition. Reaction Products The major reaction products of the decomposition of SF 6 were SiF 4, SO 2, F 2, SO 2 F 2, SOF 2Get price

Density of Sulfr hexafluoride Measurement: Gas Density Indicator GDI-100-D

gaz sf6 Density Overview Sulfur hexafluoride (SF 6 ) is an extremely effective electrical insulator used in a variety of applications, especially in medium- and high-voltage gas-insulated equipment (GIE) like switchgears, disconnectors, transducers, transformers, and ring main units.Get price

Material Safety Data Sheet Sulfur Hexafluoride SF

Chemical Formula: Sulfr hexafluoride Odor: Odorless . Specific Gravity (water-1.0): Not applicable . Normal Stable (Conditions to Avoid): Stable under normal conditions. Incompatibilities: Avoid leakage of a liquefied gas such as Sulfr hexafluoride onto water or contact hot reactive metals. Hazardous Decomposition Products: Thermal and electrical arc decompositionGet price

Byproducts of Sulfur Hexafluoride (insulating gas) Use in the Electric

F 10 (SF 5) c Disulfur decafluoride 5714-22-7 0.025 SO 2 F 2 Sulfuryl fluoride 2699-79-8 0.006 SO 2 Sulfur dioxide 7446-09-5 0.002 Table a dapted fro m Dervo s and Va ssiliou (200 0). a Note that these concentrations represent t he measured concentration for the experimental conditions st udied. TheGet price

Adsorption of sf6 gas decomposition components over Pd (1 1 1): A

Jan 28, 2019 · This work studies the adsorption properties of Pd(1 1 1) surface to various SF 6 decomposition components (H 2 S, SO 2, SOF 2, and SO 2 F 2). Due to the affluent active d electronic of Pd transition metal, the density functional theory has been used to analyze the adsorption properties of Pd(1 1 1) surface to H 2 S, SO 2 , SOF 2 , and SO 2 F 2 , including the adsorption structures, adsorption energy, and charge transfer.Get price

Thermal Decomposition of Sulfur Hexafluoride

1. From an IEEE paper 1: S F X 6 begins to decompose at 300 ∘ C and the main decomposition components contain C O X 2, S O X 2 F X 2, S O F X 2, S O F X 4, S O X 2 and H X 2 S; [...] H X 2 S is the special component only appears when thermal fault proceeds to some degree (above 360 ∘ C ).Get price

Adsorption of gaz sf6 decomposition gases (H2S, SO2, SOF2 and

Abstract. By detecting the decomposition gases of sulfur hexafluoride (SF 6 ), the type of internal fault of gas insulated switchgear (GIS) can be determined. In this paper, the scandium atom doped molybdenum sulfide material (Sc-MoS 2) was proposed, and the adsorption behaviors of four typical SF 6 decomposing gases (H 2 S, SO 2, SOF 2, SO 2 F 2) on the surfaces of intrinsic MoS 2 and Sc-MoS 2 are studied based on density functional theory (DFT) method.Get price

Adsorption and gas-sensing properties of Pt2–GaNNTs for sf6 gas

Sep 15, 2020 · Under the high discharge energy of partial electric discharges, SF 6 gas decomposes into low-fluorine sulfides (SF x, x = 1–5),. Notably, these low-fluorine sulfides are unstable. They will quickly react with trace amounts of H 2 O and O 2 in a GIS into stable gases, such as H 2 S, SO 2, SO 2 F 2, and SOF 2,.Get price

Sulfr hexafluoride gas decomposition analysis under point-to-plane 50 Hz AC

IEEE Transactions on Dielectrics and Electrical Insulation. As one of the most commonly used insulating mediums, in electrical discharge, sulfur hexafluoride (SF<sub6</sub) will decompose in the presence of water vapor and oxygen, producing various gaseous by-products. It is shown that the concentrations and production rates of SF<sub6</sub gaseous decomposition by-products heavily depend on electrical field to gas density ratio (E/N) under corona discharge.Get price

The sf6 gas Decomposition Mechanism: Background and Significance

Jan 24, 2017 · However, the decomposition components of SF 6 under PD mainly contain SOF 4, CF 4, SO 2 F 2, SOF 2, H 2 S, SO 2, and HF.Get price

Mechanism of Formation of SF Decomposition Gas Products and

reaction of decomposition products with water and oxygen are shown in Fig. 2. It can be seen that the major products of the decomposition reaction are sulphur oxides, while others are fluoride compounds. The concentrations of decomposition products are directly dependent on spark conditions and energy. Figure 2. The formation of SF 6Get price

Ni-CNT Chemical Sensor for insulating gas Decomposition Components

Oct 16, 2018 · In order to detect the type and concentration of SF 6 decomposition components, a Ni-modified carbon nanotube (Ni-CNT) gas sensor has been prepared to analyze its gas sensitivity and selectivity to SF 6 decomposition components based on an experimental and density functional theory (DFT) theoretical study. Experimental results show that a Ni-CNT gas sensor presents an outstanding gas sensing property according to the significant change of conductivity during the gas molecule adsorption.Get price

The sensing mechanism of N-doped SWCNTs toward Sulfr hexafluoride

May 15, 2018 · However, a varying degree of inevitable insulation defects existed in the production and long run process can badly damage the insulation property of SF 6, making it decomposes to typical decomposition products: SOF 2 and SO 2 F 2, etc,.Get price

(PDF) sf6 gas Decomposition Gas Sensor Based on GeP Monolayer: A

In this paper, we adopted the first-principles calculations to investigate the sensing properties of the GeP monolayer to four Sulfr hexafluoride decomposition gas molecules (H2S, SO2, SO2F2 and SOF2).Get price

Insights on decomposition process of c-C4F8 and c-C4F8/N2

They found that CF 4, C 2 F 6, C 2 F 4, C 3 F 8 and C 3 F 6 are the main decomposition products . Hayashi et al. explored the reaction mechanism of CF 2 particles produced by c-C 4 F 8 based on density functional theory (DFT) and revealed the dissociation properties of c-C 4 F 8 molecules comprehensively [ 16 ].Get price


Sulfur hexafluoride (sf 6) is widely used as a gaseous dielectric in high-voltage applications due to its extremely large cross section for electron attachment [1-3] and the stability of gaz sf6' with respect to decomposition in subsequent collisions with sf6 gas [4].Get price

DFT Analysis of neutral decomposition by-products in insulating gas-CO2

The gaseous decomposition products were assayed by gas chromatography at the end of each run carried out over a range of transported charges covering 8–17 C.The presence of CO2 in Sulfr hexafluoride and gaz sf6Get price

Sulfr hexafluoride Decomposition in Gas-Insulated Equipment - IEEE Journals

Abstract: The increasing application of sf 6 as an insulating gas has led to many studies on Sulfr hexafluoride decomposition in gas-insulated equipment. In the presence-of an electric arc, spark or corona, gaz sf6 decomposes to a wide variety of chemically active products which possess completely different properties from gaz sf6.Get price

Tungsten hexafluoride - Wikipedia

Tungsten fluoride, also known as tungsten hexafluoride, is an inorganic compound with the formula WF6. It is a toxic, corrosive, colorless gas, with a density of about 13 g/L It is one of the densest known gases under standard conditions. WF6 is commonly used by the semiconductor industry to form tungsten films, through the process of chemical vapor deposition. This layer is used in a low-resistivity metallic "interconnect". It is one of seventeen known binary hexafluorides.Get price

Sulfr hexafluoride gas measuring devices – Synergy Power Systems

The Sulfr hexafluoride gas must always be pure since humidity and toxic or corrosive decomposition products in circuit breakers impair the insulating properties of the gas. The gas quality has to be monitored in accordance with the F-gas Regulation (EU) 517/2014.Get price

Decomposition Properties of C4F7N/N2 Gas Mixture: An

The energy barrier for insulating gas decomposition was 0.147 eV. The results show the adsorption and decomposition process of gaz sf6 molecules on the surface of α-Al2O3, which proves that α-Al2O3 has certainGet price

Sensors | Free Full-Text | Gas Sensing Analysis of Ag

Detection of decomposition products of sulfur hexafluoride (insulating gas) is one of the best ways to diagnose early latent insulation faults in gas-insulated equipment, and the occurrence of sudden accidents can be avoided effectively by finding early latent faults. Recently, functionalized graphene, a kind of gas sensing material, has been reported to show good application prospects in the gas sensorGet price

Collisional electron detachment and decomposition rates of SF

tions for insulating gas-, SFs-, and F- on insulating gas presented in the preced-J. Chern. Phys. 91 (4), 15 August 1989 ing companion paperl4 to calculate electron-detachment and ion-conversion reaction coefficients as functions of elec-tric field-to-gas density ratios (E IN) for the reactions listed in Table I. We discuss the relevance of these results to theGet price

A Pt-Doped TiO2 Nanotube Arrays Sensor for Detecting sf6 gas

Figure 10 provides a comparison of the gas response of the intrinsic and Pt-doped TiO 2 NTs gas sensors to 50 ppm of the three sf6 gas decomposition productt gases (SO 2, SOF 2, SO 2 F 2) at the optimal operating temperature. The gas response of the intrinsic TiO 2 NTs sensor to the three decomposition gases is discussed in Reference .Get price

Decomposition Properties of C4F7N/N2 Gas Mixture: An

The insulation characteristics and decomposition components of C4F7N/N2 gas mixture, a potential substitute for gaz sf6, were first explored by breakdown experiments/gas chromatography–mass spectrometer. The structural properties of C4F7N molecule and the decomposition mechanism of C4F7N/N2 gas mixture were analyzed based on the density functional theory calculation and ReaxFF molecular dynamicsGet price