Why are PCB boards available in multiple colors?

- Dec 07, 2017-

Most of the PCB boards we see every day are green, but in addition to green, we can occasionally see blue or even black PCB boards. Why exactly choose different colors for PCB board? Why is green the most common color? This article will reveal the secret behind the "colorful" PCB.

       Green ink is by far the most widely used, the longest in history, and it is also the cheapest in the current market, so green is used by a large number of manufacturers as the main color of its products.

       Under normal circumstances, the entire PCB board product is subject to the process of board making, SMT, etc. in the production process. When making a board, there are so many processes that have to go through the yellow room, and the effect of green in the yellow room is necessarily better. But this is not the main reason. When soldering components in SMT, the PCB has to go through the solder paste and the post and the final AOI calibration lamp process. These processes are all optical alignment calibration, green background color to the instrument. The recognition effect is better.

       Common PCB colors are red, yellow, green, blue and black. However, due to manufacturing processes and the like, many line quality inspection processes must rely on the naked eye observation and identification of workers or the use of flying probe testing techniques. In the case of strong light, relatively green does not hurt the eyes, so most manufacturers currently use green PCBs.

       The principle of blue and black is that the elements such as cobalt and carbon are respectively doped to have a certain electrical conductivity, and the short circuit may occur in the case of energization. Moreover, the green PCB is relatively environmentally friendly, and generally does not emit toxic gases when used in a high temperature environment.

       There are also a small number of manufacturers in the market who will use black PCB boards. The main reason for this may be that black looks more "higher", but black boards are not easy to see the wiring, which brings the board. Certain difficulty. Most of the Android embedded boards are now using black PCBs.

       In fact, since the middle and late last century, the industry has begun to pay attention to the color of PCB boards. Mainly because many high-end panels of the first-tier manufacturers have adopted a green PCB color design, so people slowly think that green is the "default" color of the PCB.

       The choice of PCB color is the epitome of the rise, development and choice of a new technology in the development of modern science and technology. The birth and development of PCB has promoted the progress of countless electronic industries, and it is constantly evolving and changing. In the near future, there may be other colors of PCBs that will replace the current trend of green. Let us Wait and see!


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