Soft and hard classification
Divided into rigid circuit boards and flexible circuit boards, soft and hard combination board. General PCB is called Rigid (Rigid) PCB, rigid PCB and flexible PCB is the direct difference between the flexible PCB can be bent. The common thickness of the rigid PCB is 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.6mm, 2.0mm and so on. Flexible PCB common thickness of 0.2mm, to weld parts of the place will be in the back with thicker layer, thicker layer thickness 0.2mm, 0.4mm range. The purpose of understanding these is to provide them with a spatial reference for structural engineers to design. Rigid PCB materials include: phenolic paper laminates, epoxy paper laminates, polyester glass felt laminates, epoxy glass cloth laminates; flexible PCB materials commonly include: polyester film, poly Amine film, fluorinated ethylene propylene film.
According to the number of circuit layers: divided into single-sided, double-sided and multi-layer board. Common multi-layer board is generally 4-layer or 6-layer board, the complex multi-layer up to dozens of layers.
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