Dry film is a polymer material that can block electroplating and etching functions. Its reaction principle is to polymerize through ultraviolet radiation, producing stable substances attached to the board surface. It is a widely used consumer material in the microelectronics industry and circuit board manufacturing industry. Today, the editor of CITIC China PCB will talk to you about the types of PCB dry films.

　　1. Single sided PCB

　　The substrate material is mainly composed of paper phenol copper laminated board (paper phenol as the bottom, covered with copper foil) and paper epoxy resin copper laminated board. Most of them are used in household appliances such as radios, AV appliances, heaters, refrigerators, washing machines, as well as commercial machines such as printers, vending machines, circuit breakers, and electronic components, with the advantage of low prices.

　　2. Double sided PCB

　　The substrate material is mainly Glass-Epoxy copper laminated board, GlassComposite (glass composite) copper laminated board, and Paper Epoxy copper laminated board. Most of them are used in personal computers, electronic instruments, multifunctional telephones, automotive electronic machines, electronic peripherals, electronic toys, etc. As for Glass benzene resin copper laminate, Glass polymer copper laminate is mostly used in communication machines, satellite broadcasting machines, and mobile communication machines due to its excellent high-frequency characteristics, and of course, its cost is also high.

　　3. 3-4 layer PCB

　　The substrate material is mainly Glass Epoxy or benzene resin. The main uses are personal computers, Me (Medical Electronics) machines, measurement machines, semiconductor testing machines, NC (Numeric Control) machines, electronic switches, communication machines, memory circuit boards, IC cards, etc. There are also glass composite copper laminated boards as multi-layer PCB materials, mainly focusing on their excellent processing characteristics.