PCB green oil, also known as solder mask ink, is a special type of ink applied to the surface of a PCB. So why do most circuit boards use green ink?
The main key functions of PCB green oil are as follows:
- Protect circuits and extend service life. PCBs are covered with dense circuits and solder joints, and these exposed copper circuits are highly susceptible to oxidation and corrosion in the air. Green oil acts like a protective film, isolating the circuits from the external environment, thereby significantly extending the service life of the PCB. This is especially important in humid environments, as green oil can effectively prevent copper circuits from rusting and ensure the stability of the circuit board.
- Provide insulation and prevent short circuits. The spacing between PCB circuits is extremely small. Without the insulating protection of green oil, different circuits may come into accidental contact, causing short circuits, which can damage the circuit board or even disable the entire device. The green oil coating not only improves the safety of the circuit but also ensures the reliable operation of electronic equipment.
- Reflect quality and enhance appearance. A uniform and vivid green color usually indicates good green oil coating quality, while uneven color or defects may suggest problems in the production process. In some high-end electronic products, the quality requirements for green oil are more stringent because it is not only related to the performance of the circuit board but also associated with the overall appearance and quality image of the product.
Summary:
Although PCB green oil is just a thin coating, it provides important protection, insulation, and aesthetic functions for the circuit board. The choice of green color is based on both technical and historical reasons, and it also represents a balance between functionality and visual effects.