Copper Ground Rod branded as Huadian from our company are using special electroforming technology to apply 99.9% pure copper uniformly to distribute on low carton steel core so as to make copper and steel core to combine perfectly. If two are not combined closely, when power on it will cause battery reaction that metal iron from positive end will have oxidization reaction and iron ion will be lost and steel core will be corroded quickly. It has characteristics such as thick copper coating more than 0.25 mm ,good adhesion ,non peeling off and thread can be rolled etc. The advantages are good tensile strength more than 600Newton/square mm and good in anticorrosion that life span is more than 50 years or more, constant low resistance and good plasticity which had the characteristics of copper as well as steel.