Dielectric breakdown strength is a measure of the ability of an insulating material to withstand electric current. High dielectric strength is important for electrical equipment and systems to protect critical components from damage due to power surges. This is especially true in the power and electromobility industries.

Alumina ceramics offer good thermal stability, chemical resistance, and electrical insulation, making them an attractive material for electrical applications. However, surface quality, porosity and chemical composition affect electrical performance, especially dielectric strength. New analytical methods provide an unprecedented understanding of the interplay between these factors and contribute to the development of new high-performance insulators.