As the name implies, copper is the highest copper content, because the color purple is also called the Red Copper, the main component is the CU silver, the content is 99.5~99.95%; main impurity elements: phosphorus, bismuth, antimony, arsenic, iron, nickel, lead, tin, sulphur, zinc, oxygen, etc. used to make conductive equipment, high-grade copper alloy, copper base alloy.

Copper has a good weldability, can be cold, thermoplastic processed into a variety of semi-finished products and finished products. In the 1970s, the production of copper was more than that of other kinds of copper alloys.

Theoretical value of pure copper resistivity if various materials are made into 1-metre, cross-sectional area of 1 square millimeter wire, when measuring their resistance (called the resistivity of this material) at 20 ℃, the silver resistivity is the smallest, followed by the order of copper, aluminum, tungsten, iron, manganese, copper and nickel-chromium alloys, and the resistivity increases in turn.

The resistivity of the aluminum conductor is more than 1.5 times times that of the copper conductor, and its resistivity is =. 0294ωmm2/m, copper resistivity =. 01851ω·mm2/m, the resistivity varies with temperature.

Daily identification

Many unscrupulous businessmen to deceive consumers, through the process of copper color plating, or other processes made of copper color, the cheap iron as the so-called pure copper to sell. Actually very simple, we can pass its density, the magnetic field and so on appraisal. Copper is not attracted to magnets. We can use a magnet at home to test the items we buy is not really pure copper. The larger the suction, the greater the iron content. Other metal materials that can be attracted by magnets are more expensive, such as nickel, cobalt and other metals they will not join. Note: This method can only be used to determine whether the magnet can attract the pure copper. However, not to be attracted by the magnet is not pure copper, but also may be added to other raw materials alloy. Pure copper color is purple red from inside to outside, so it is called copper. For some wires, the appearance of the vessel can be viewed color, generally scraped out of the outer layer, or observation section, and inside and outside the same is purple red pure copper possibility is big.