Copper foil is a kind of cathode electrolytic material. It is a thin and continuous metal foil deposited on the base layer of the circuit board. It serves as the conductor of PCB. It is easy to adhere to the insulating layer, accept the printed protective layer, and form a circuit pattern after etching.

Copper foil is made of copper and a certain proportion of other metals. There are generally two types of copper foil: 90 foil and 88 foil, that is, copper foil with a copper content of 90% and 88% and a size of 16 * 16cm. It is the most widely used decorative material. Such as: hotels, temples, Buddha statues, gold lettered signboards, tile mosaics, handicrafts, etc.

Copper foil has low surface oxygen characteristics and can be attached to various substrates, such as metals and insulating materials, with a wide temperature range. It is mainly used for electromagnetic shielding and anti-static. The conductive copper foil is placed on the substrate surface and combined with the metal substrate, which has excellent conductivity and provides electromagnetic shielding effect. It can be divided into: self-adhesive copper foil, double conductive copper foil, single conductive copper foil, etc. Electronic grade copper foil (purity of more than 99.7%, thickness of 5um-105um) is one of the basic materials of the electronic industry. With the rapid development of the electronic information industry, the use of electronic grade copper foil is increasing. The products are widely used in industrial calculators, communication equipment, QA equipment, lithium-ion batteries, civil televisions, video recorders, CD players, copiers, telephones, heating and cooling air conditioners, automotive electronic components, game machines, etc. The demand for electronic grade copper foil, especially high-performance electronic grade copper foil, is increasing at home and abroad. Relevant professional institutions predict that by 2015, China's domestic demand for electronic grade copper foil will reach 300000 tons, and China will become the largest manufacturer of printed circuit boards and copper foil bases in the world. The market for electronic grade copper foil, especially high-performance foil, is promising.