According to the classification of substrate: flexible circuit board, rigid circuit board and rigid flexible combination board.

　　1. Flexible PCB (flexible board)

　　Flexible board is a printed circuit board made of flexible substrate. Its advantage is that it can be bent to facilitate the assembly of electrical components. FPC has been widely used in aerospace, military, mobile communications, portable computers, computer peripherals, PDA, digital cameras and other fields or products.

　　2. Rigid pcb

　　It is made of paper base (commonly used in single side) or glass cloth base (commonly used in double-sided and multi-layered), pre impregnated with phenolic resin or epoxy resin, and then laminated with copper foil on one or both sides of the surface. This kind of PCB copper clad laminate, we call it rigid board. Then PCB is made, we call it rigid pcb. Rigid pcb is a printed circuit board made of rigid substrate which is not easy to bend and has specific strength and toughness. Its benefit is that the electronic components attached to it can provide specific support.

　　3. Rigid flexible PCB (rigid Flex PCB)

　　Rigid flexible combination board refers to a printed circuit board including one or more rigid areas and flexible areas, which is composed of rigid board and flexible board laminated together. The advantage of rigid flexible composite board is that it can not only provide the support effect of rigid printed board, but also has the bending characteristics of flexible board, which can meet the demand of three-dimensional assembly.

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