Is there a difference in the ink color of the PCB circuit board?

When you open an electronic product, there are usually several PCBs inside, and the colors of the PCBs are various: green, blue, red, white, black, etc. Will these different colors be distinguished? Today we will take a look at the ink of PCB.

The color of the PCB is mainly the color of the solder mask ink. There are more green, blue, red, black, and white on the market. The function of solder mask, as the name implies, is to prevent soldering. Usually, a layer of insulating solder mask ink is printed during PCB manufacturing, and the lines and pads that do not need to be exposed are covered with solder mask ink to prevent unnecessary short circuits during soldering. It is not only beautiful, but also protects the copper surface of the circuit from oxidation. As for what color to use, it mainly depends on what product the PCB board is used on. For example, the aluminum substrate used on the LED panel light should use white solder mask. Other products do not have special requirements, generally use common green.

blue PCB circuit board
The color of the ink depends on the ink manufacturer, and the same color will have different characteristics. The characteristics of the ink are mainly reflected in the following aspects:

Nickel-plated gold: At present, many PCB surface treatments are nickel-plated and gold-plated, so the resistance to nickel-plated gold must be good.
High photosensitivity: The higher photosensitivity allows the ink to be cured and formed quickly during the curing process.
Cavitation resistance: No air bubbles or pinholes will be generated due to air bubbles during the curing process of spraying or printing ink.
High adhesion: The adhesion affects the life of the ink, and the high adhesion avoids falling off and lifting.
Heat resistance: Good heat resistance can protect the stability of the PCB of high-power components.
Halogen-free: The production process of PCB has a certain impact on the environment, and lead-free and halogen-free will be the focus of future PCB manufacturing.
Smoke concentration: The lower the smoke concentration generated during use, the smaller the impact on the environment.
There is no difference in performance between different ink colors. As the electrical connection between components, the color of the PCB is not directly related to its performance, and the difference in color will not affect the electrical properties. The performance of the PCB board is determined by factors such as materials and wiring design. But in the PCB manufacturing process, the black solder mask is not very friendly to the follow-up inspection. Because the black solder mask will cover the circuit and make it difficult to identify, it will cause certain difficulties for subsequent inspection and maintenance. In recent years, many designers will choose matte solder mask inks to make the PCB look very textured. What color to use in the end depends on where your product is used, and whether the color requirements are high.

Post time: Jun-09-2022