[2] The compound is a Lewis acid and strong oxidant, adducting potassium fluoride and oxidizing nitric oxide to nitrosyl:[3] Rhenium hexafluoride is a liquid at room temperature.

[1] The solid structure measured at −140 °C is orthorhombic space group Pnma.

There are four formula units (in this case, discrete molecules) per unit cell, giving a density of 4.94 g·cm−3.

[2] The ReF6 molecule itself (the form important for the liquid or gas phase) has octahedral molecular geometry, which has point group (Oh).

[2] Rhenium hexafluoride is a commercial material used in the electronics industry for depositing films of rhenium.