When it comes to copper cable lugs, the grade of copper used is usually high-purity, electrolytic copper, boasting a purity of at least 99.9%. This type is commonly known as EC grade copper (Electrolytic Copper) and is designated as C11000. The reason for choosing this grade is simple: it provides outstanding electrical conductivity, typically ranging from 97% to 99.9% IACS (Internati... https://www.pioneerpowers.com/copper-cable-lugs.php