The copper purity significantly affects the performance of copper cable lugs, both electrical conductivity and long-term reliability. Copper with high purity, usually 99.9% and above, offers better electrical conductivity, which is critical in keeping resistance to a minimum and avoiding heat build-up at the point of connection. Copper cable lugs fabricated using lower purity copper o... https://www.pioneerpowers.com/copper-cable-lugs.php