Probably the first metal to be smelted from its ore, Copper derives its usefulness from a combination of desirable properties. It resists corrosion, provides outstanding electrical and thermal conductivity, and has good ductility with an attractive appearance. While its strength-to-weight ratio is relatively low, Copper is considered a heavy metal, with a density of .323 lbs/in3. The pure element is salmon pink, melts at 1981 F (1083 C), and polishes to a bright metallic luster. Used in alloyed form since at least 3500 BC, it is nonmagnetic, combines well with other metals, and is easy to fabricate and join. Copper and its alloys tend to work harden, and can be hot or cold worked for increased strength. Copper Rod C110 ASTM-B187 is 99.9 percent commercially pure Copper and can be bent, riveted, drilled, soldered, brazed and welded to most any design requirement. Commonly used for electrical connections and ground straps.