High RRR (Residual Resistivity Ratio)

The residual resistivity ratio (RRR) is an index of the ease of the flow of electricity at an extremely low temperature (4.2K). Aluminum is excellent in electrical conductivity, and the tendency becomes stronger as the purity increases.
In addition, when high-purity aluminum with low resistance is placed at an extremely low temperature, the resistance caused by thermal vibration is reduced to a negligible level, and the RRR is increased. By taking advantage of this property, high-purity aluminum is also used as a stabilizing material for superconductors.

*The values in the table are reference values.