The PCB circuit board with conformal coating has the "three proofing" properties of waterproof, moisture-proof and dust-proof, as well as the properties of cold and heat shock resistance, aging resistance, radiation resistance, salt fog resistance, ozone corrosion resistance, vibration resistance, good flexibility and strong adhesion.
Moisture is the most common and destructive factor to PCB. Excessive moisture will greatly reduce the insulation resistance between conductors, accelerate high-speed decomposition, reduce Q value, and corrode conductors It is often seen that the metal part of the PCB circuit board has copper green, which is caused by the chemical reaction of copper, water vapor and oxygen.
