What is the main reason why SF6 gas has excellent insulation characteristics?

SF6 is a gas dielectric with high insulation strength. The main reason why SF6 has high insulation properties is that the molecular structure of SF6 is a Octahedron with one sulfur atom as the center and six fluorine atoms at each top. Fluorine atom is an element with strong Electronegativity, its electron capture cross section is large, and it has a strong ability to absorb electrons. There are six fluorine atoms in an SF6 molecule, and the electron affinity of SF6 is as high as 3.4eV. Therefore, the insulation characteristics of SF6 are extremely high.