Clean Copper is one of the most important metallic elements. Next to Silver, Copper is the best conductor of electricity. Copper is non-magnetic, non-sparking, and red in color. Copper is used in the manufacturing of electrical wire, transformers, electric motors, water pipe/tubing, roofing and switchgears. It must be free of any other contaminants including: magnetic or non-magnetic metal, insulation, rubber, plastic etc.