Aluminum is a chemical element. Its chemical symbol is al, and its atomic number is 13. Aluminum is the third most abundant metal element in the earth's crust after oxygen and silicon. In the category of metal, it is the second largest category after steel. By the end of the 19th century, aluminum came to the fore and became a competitive metal in engineering applications. With the development of aviation, construction and automobile industries, the unique properties of aluminum and its alloys are required, which is greatly conducive to the production and application of this new metal aluminum. Aluminum is widely used.

Pure aluminum is very soft, not strong and has good ductility. It can be drawn into thin wire and rolled into foil. It is widely used in wire, cable, radio industry and packaging industry. Its conductivity is about two-thirds of that of copper, but because its density is only one-third of that of copper, compared with equal quality and equal length aluminum wire and copper wire, the conductivity of aluminum is about twice that of copper, and the price is lower.