What Do You Need To Know About Conformal Coating For PCB Assembly?

It is important to note that electronic components in some applications may be exposed to corrosive elements such as acids, salts, conductive substances and liquids. This exposure slowly corrodes the PCBA, components and solder joints over time. This type of corrosion can cause premature equipment failure, short circuits, and severe conditions that can lead to fire or even explosion.

What is a conformal coating?

A conformal coating is a protective chemical coating or polymer film with a thickness of 25-75μm (50μm typical), conforming to the circuit board topology. Circuit board conformal coatings are designed to protect electronic circuits from harsh environments that may contain moisture and chemical contaminants, extending the life of the PCBA and enhancing the reliability and safety of electronic boards.

Why is conformal coating required for PCB assembly?

Generally, any newly manufactured printed circuit board with electronic components will work fine, but this situation can cause the performance of the circuit board to deteriorate rapidly due to the influence of external harmful factors in its working environment. Conformal coating is a method commonly used to seal or prevent corrosion and other damage from external contaminants that come into contact with electronic components over time to protect circuit boards from moisture, salt spray, chemicals, dust, and Severe temperature effects to proactively prevent issues such as corrosion, rapid aging, mold growth and electrical failures. Most enclosures are designed to keep out contaminants, but there is always the possibility of moisture, especially in tropical or humid climates. And conformal coatings can also be used to withstand higher electric fields in high component density designs

, can withstand higher voltage gradients and allow for smaller circuit trace spacing and even withstand shock environments, allowing electronics designers to meet miniaturization and reliability requirements.

What industries are conformal coatings used in?

The ubiquitous use of conformal coatings is widely used in communications, automotive, military, aerospace, marine, outdoor lighting, oil and gas, industrial controls, IoT devices, and green energy.

However, due to the rapid development of the electronics industry, conformal coatings are also expanding their application to the home and mobile electronics industries, providing the necessary combination of outstanding performance and reliability for a large number of electronic devices.

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