Under realistic conditions, such as chemical, vibration, high dust, salt fog, humidity and high temperature, the circuit board may have problems such as corrosion, softening, deformation and mildew, resulting in circuit failure of the circuit board.
Conformal coating is applied to the surface of the circuit board to form a layer of three proofing protective film (three proofing refers to moisture-proof, salt fog proof and mildew proof). Under the conditions of chemical substances (such as fuel, coolant, etc.), vibration, moisture, salt spray, humidity and high temperature, the circuit board without conformal coating may be corroded, mold growth and short circuit, resulting in circuit failure. The use of conformal coating can protect the circuit from damage, so as to improve the reliability of the circuit board, increase its safety factor and ensure its service life.
In addition, since the conformal coating can prevent electric leakage, it allows higher power and closer PCB spacing. Thus, the purpose of component miniaturization can be met.
