Why are most PCBs green? The answer to this question is as follows:
1.Green solder resist inks are the oldest and cheapest and most popular.
2.In general the electronic board level products have to go through the patch and plate making process, in the process of several processes is to go through the yellow light yellow light in the room, the green room visual effect is better, but this is not the main. In the SMT welding, to pass the upper tin and tie pieces, and the final AOI calibration, these processes are to learn optical positioning calibration, green background, the instrument recognition effect is better.
3.There is a common red yellow green blue black. Due to the technical problems, many lines of inspection still depend on the workers' eyes (of course, most of them are now using the flying needle test). It's a tiring job to keep looking at the board with a strong light. Oh, green is the least eye damage. So most of them are green.
4.Blue and black, because they are doped with cobalt and carbon, has a certain conductivity, so there is a risk of short-circuit, green PCB more environmentally friendly, high temperature environment will not release toxic gases.
5.Since about 2007, people began to pay attention to the color of the PCB board, mainly because many high-end plate first tier manufacturers have adopted the PCB board design color green, so people gradually think PCB must be high-end color is green.