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Sulfur hexafluoride 99.999％

Sulfur hexafluoride 99.999％ is a colorless, odorless, non-toxic, non-flammable stable gas with the chemical formula SF₆. Its molecular weight is 146.07. Its density is 6.1kg/m3 at 20℃ and 0.1 MPa, which is about 5 times the density of air. Sulfur hexafluoride is gaseous at room temperature......

Release time：2025-04-26

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Sulfur hexafluoride 99.999％ Introduction:

Sulfur hexafluoride 99.999％ is a colorless, odorless, non-toxic, non-flammable stable gas with the chemical formula SF₆. Its molecular weight is 146.07. Its density is 6.1kg/m3 at 20℃ and 0.1 MPa, which is about 5 times the density of air. Sulfur hexafluoride is gaseous at room temperature and pressure. Its critical temperature is 45.6℃, triple point temperature is -50.8℃, and sublimation point temperature is -63.8℃ at normal pressure. 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.

Sulfur hexafluoride 99.999％ Physical properties:

1. Properties: colorless and odorless gas.

2. Melting point (℃): -51

3. Boiling point (℃): -64 (sublimation)

4. Relative density (water = 1): 1.67 (-100℃)

5. Relative vapor density (air = 1): 6.602

6. Saturated vapor pressure (kPa): 2450 (25℃)

7. Critical temperature (℃): 45.6

8. Critical pressure (MPa): 3.76

9. Octanol/water partition coefficient: 1.68

10. Solubility: slightly soluble in water, soluble in ethanol and ether

11. Heat of vaporization (Kg/mol): 23.59 (sublimation heat)

12. Heat of fusion (Kg/mol): 5.82

13. Viscosity (mPa·s, gas): 0.01576

14. Viscosity (mPa·s, liquid): 0.277

15. Refractive index (gas): 1.000783

Sulfur hexafluoride 99.999% Chemical properties:

The chemical properties of sulfur hexafluoride are very stable. Compared with selenium hexafluoride, the hydrolysis rate of sulfur hexafluoride is extremely low. This is because the radius of the sulfur atom is small, resulting in a large steric hindrance around the six fluorine atoms. However, the radius of the fluorine atom is not very large, so there is no excessive repulsion between the six fluorine atoms, and the S-F bond is not easy to dissociate. The formation enthalpy of sulfur hexafluoride is -1220kJ/mol. It can be seen that the fluorine atom radius and the sulfur atom radius together make the sulfur hexafluoride molecule very stable - the molecule itself is not easy to break the bond and decompose, and the attacking group is not easy to approach the central atom, which is stable both thermodynamically and kinetically. Some studies have shown that sulfur hexafluoride can exist stably in the atmosphere for thousands of years.

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