The oxygen content and appearance of copper rods are different due to the different production processes. The copper rod produced by up-casting is properly processed and the oxygen content is below 20ppm, which is called anaerobic copper rod; The copper rod produced by continuous casting and rolling is hot-rolled under protective conditions, with oxygen content in the range of 200-500 PPM, but sometimes as high as over 700ppm. Under normal circumstances, the copper produced by this method is externally shiny, commonly known as bright rod.
Anoxic copper rod is pure copper without oxygen and without any deoxidizer residue. But it actually contains very small amounts of oxygen and some impurities. According to the standard, the oxygen content shall not be greater than 0.02%, the total impurity content shall not be greater than 0.05%, and the purity of copper shall be greater than 99.95%.
In general, the resistivity of electrolytic copper is lower than that of low oxygen copper rod. Therefore, in the production of products with severe resistance requirements, oxygen-free copper rod is more economical. High quality raw materials are required for the manufacture of anaerobic copper rods. An even better option is to draw copper wire with a diameter less than 0.5mm. 6MM anaerobic copper rod for production of copper flat wire. 3mm non-oxygen copper rod for wire drawing, production of copper core wire, enameled wire. Mainly used in wire, cable and motor.