Below is a list of Copper manufacturers from Downers Grove, Illinois. Copper is a metal material found abundantly in nature that is widely used in both commercial and industrial applications because of its many useful properties. Copper is a malleable and ductile metal, very soft in its pure state, and is also the best known economical conductor of heat and electricity. It is nonmagnetic, machinable, formable and durable. Additional properties, such as hardness, can be reached by adding alloying elements. Copper has very good alloying characteristics. The two main types of copper alloys are copper primary alloys, which include brass and bronze, made from primarily copper and zinc and copper and tin, respectively.