Copper, a copper alloy with an aristocratic purple-red hue, is known as industrial pure copper. It has excellent electrical and thermal conductivity, is corrosion-resistant, and is easy to process and weld. Its purity is extremely high, with a copper content of up to 9995%, which guarantees the purity of copper. In copper, trace amounts of oxygen have little effect on electrical conductivity, thermal conductivity and processing, but they are prone to "hydrogen disease". 
In a high-temperature reducing atmosphere, such as the temperature is higher than 370, copper is not suitable for annealing or welding and other processing operations. This is due to the fact that small amounts of impurities, especially elements such as phosphorus, arsenic, and aluminum, can significantly reduce the electrical conductivity of copper. In order to ensure the high conductivity of copper, industrial copper generally needs to be oxygen-free copper, and it is necessary to avoid mixing trace amounts of oxygen in the refining process. 
In addition, impurities such as lead, antimony, and bismuth can also adversely affect the crystallization of copper, making the texture of copper fragile and making it difficult to process pure copper. However, by electrolytic refining, we can gradually dissolve the impure copper so that the pure copper precipitates on the cathode, thus obtaining a purity of up to 9999% electrolytic copper. 
Copper is used in a wide range of applications, and about 50% of copper is purified into pure copper every year, which is widely used in the electrical industry. Due to its excellent performance and wide range of uses, copper is known as the blood vessel of industry, providing a powerful impetus for the development of modern industry. 