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How to judge the quality of Multilayer PCB from color

How to judge the quality of Multilayer PCB circuit board from PCB color. Today, Jingke Yulong will explain the impact of PCB color on its performance. How should we judge the quality of Multilayer PCB.
First, as a printed circuit board, PCB mainly provides interconnection between electronic components. There is no direct relationship between color and performance, and different pigments will not have much impact on the performance of electrical appliances. However, the performance of PCB is determined by the materials used (high Q value), wiring design and several layers of boards. In the process of PCB washing, black is the most likely to cause color difference. If there is a slight deviation in the raw materials and manufacturing process used by the PCB Factory, the defective rate of PCB will increase due to color difference. This directly leads to an increase in production costs.
In fact, the raw materials of PCB can be seen everywhere in our daily life, that is, glass fiber and resin. The glass fiber and resin are combined and hardened to become a kind of heat-insulating, insulating and not easy to bend plate, which is the PCB substrate. Of course, the PCB substrate made of glass fiber and resin alone cannot conduct signals, so the manufacturer will cover a layer of copper on the surface of the PCB substrate, so the PCB substrate can also be called a copper-clad substrate.
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