What is the difference between the color of PCB circuit board solder mask ink?

The PCB board we often see have many colors. In fact, these colors are made by printing different PCB solder masks. Common colors in PCB circuit board solder mask are green, black, red, blue, white, yellow, etc. Many people are curious, what is the difference between these different color circuit boards?

Whether it is a circuit board on an electrical appliance, a mobile phone motherboard or a computer motherboard, PCB circuit boards are used. From the appearance point of view, PCB circuit boards come in various colors, green is more common, followed by blue, red, black, white and so on.


No matter what color the circuit board of the same material number is, its function is the same. Circuit boards of different colors indicate that the color of the solder mask used is different. The main function of the solder mask is to put it on the solder mask to cover the wires to insulate and prevent short circuits. Green is often seen, because everyone is used to using green solder mask ink for circuit boards, and solder mask manufacturers generally produce more green oil, and the cost will be lower than other color inks. , Almost all in stock. Of course, some customers will also require other colors, such as black, red, yellow, etc., so they need to be printed with other colors of solder mask.

The ink on the PCB circuit board, generally speaking, no matter what color the solder mask, its role is not much different. The main difference is the visual difference. Except for the white color used on the aluminum substrate and the backlight, there will be a certain difference in light reflection, and the other colors are used for solder protection and insulation protection.

The solder masks of different colors are printed on the circuit board. Although the function difference is not big, there are still some slight differences. The first is that it looks different. Subconsciously, I feel that black and blue are relatively high-end, and the requirements will be higher. However, circuit boards that use green solder mask are so common that they feel very common. Many single panels use green solder mask. Compared with black, it is not easy to see the line pattern, and the covering will be better, which can prevent peer copying to a certain extent. White reflects light better, and is generally used for lighting or backlighting.

Most of the solder masks used in circuit boards are green, and the solder masks used in mobile phone flexible antenna boards are mainly black and white. The wiring board and camera module board mostly use yellow solder resist ink, and the light bar board uses white or matt white solder resist ink.

Generally speaking, what color solder resist ink is used on the PCB depends mainly on the requirements of the customer of the circuit board factory. The color does not have much effect on performance. A little bit is that if the photosensitive solder resist ink is used, it is generally easy to be white. Out of the film seal. On the flexible circuit board, the white solder mask is less resistant to bending than other colors.

There are also some solder masks on circuit boards with special colors. Many of these special color solder masks are prepared by ink manufacturers, and some are mixed with two types of solder mask inks in a certain proportion. Blended out (some large circuit board factories, the oil blender inside will adjust the color)

No matter what color PCB solder resist ink is, it must have good printability and resolution, so as to meet the silk screen requirements and production requirements of the factory.