Copper cathodes with certain maximum impurity levels are also registered and traded on the London Metal Exchange. High-quality copper is characterized by low impurity levels, as even the smallest amounts of selenium, bismuth or antimony can strongly influence conductivity. Copper is a very important material for the energy transition and is used extensively for renewable technologies such as solar cells and electric vehicles. However, copper also has a significant carbon footprint. One of the most important materials in the copper supply chain is the copper cathode, which has a purity level of 99.95%.