Conformal Coating

Definition of Conformal Coating

A conformal coating is a protective, non-conductive layer applied to circuit boards or electronic components to safeguard them from environmental factors such as moisture, dust, chemicals, and temperature changes. This coating helps prevent corrosion, electrical leakage, and short circuits, ultimately enhancing the longevity and reliability of the electronic devices. Common materials used for conformal coating include acrylics, silicones, epoxy resins, and urethane resins.


The phonetics of the keyword “Conformal Coating” would be: kən-‘fɔr-məl ‘koʊ-tɪŋ

Key Takeaways

  1. Conformal coating is a protective, non-conductive layer applied to PCBs (Printed Circuit Boards) to safeguard them from environmental factors such as moisture, chemicals, and temperature fluctuations.
  2. Applying conformal coating enhances the longevity and reliability of electronic devices, reducing the risk of failure and ultimately lowering repair and replacement costs.
  3. There are various types of conformal coatings including acrylic, silicone, epoxy, and polyurethane, each with unique properties tailored to specific applications or environmental conditions.

Importance of Conformal Coating

Conformal coating is a crucial technology term, primarily because it refers to a protective, non-conductive film applied to electronic circuitry to safeguard it from potential threats, such as moisture, dust, chemicals, and temperature fluctuations.

These coatings are essential in enhancing the reliability and performance of electronic devices, particularly in harsh environments.

By offering a barrier against contaminants and other environmental stressors, conformal coatings minimize the risk of component failure, device malfunction, and extend the service life of electronics.

As technology continues to evolve and electronic devices become a vital part of everyday life, conformal coating plays an increasingly vital role in maintaining the durability and functionality of these devices.


One of the primary functions of conformal coating is to provide protection and reinforcement to electronic circuitry, substantially increasing its durability and reliability. The coating is particularly useful for electronics subjected to harsh environmental conditions, such as extreme temperatures, moisture, and dust. Furthermore, it serves as an essential safeguard against corrosion, electrical arcing, and mechanical abrasion.

Covering Printed Circuit Boards (PCBs) with conformal coating can enhance the overall lifespan and performance of electronic devices. This makes conformal coating a popular choice for industries like military, aerospace, automotive, and marine, as it ensures that sensitive components remain reliable in even the most demanding environments. Additionally, conformal coatings can offer excellent electrical insulation.

By applying a thin, non-conductive layer over the intricate components on PCBs, the coating creates a dielectric barrier which helps curb electromagnetic interference (EMI) and reduces the risk of electrical shorts or malfunctions. Consequently, this enhances the robustness of the circuitry, allowing the device to function optimally while maintaining the integrity of the electronic components. Effectively employed across a diverse range of industries, conformal coatings demonstrate their versatility by helping to create long-lasting, dependable electronics capable of performing to their full potential.

Examples of Conformal Coating

Aerospace and Aviation: Conformal coatings are widely used in the aerospace and aviation industries to protect critical electronic components, such as printed circuit boards (PCBs) and sensors, from damage caused by moisture, humidity, and other harsh environmental factors. Commonly coated devices include navigation systems, communication equipment, and control panels, ensuring these electronic components maintain their high performance even when subjected to extreme temperature fluctuations, vibration, and shock.

Automotive Electronics: In the automotive industry, conformal coatings help improve the longevity and reliability of electronic components, such as engine control units, power regulators, and infotainment systems. These coatings protect the components from corrosive materials, including salt, oil, fuel, and other automotive fluids, as well as moisture and temperature swings. This contributes to the safe and durable operation of vehicles and reduces the risk of electronic failures.

Medical Devices: Conformal coatings are frequently applied to medical devices and equipment, including hearing aids, pacemakers, and diagnostic instruments, to improve their resistance to moisture, body fluids, and chemicals. As these electronic components are often exposed to harsh chemicals during sterilization processes or implanted in the human body, a protective conformal coating helps ensure that they perform as expected without compromising the patient’s safety or the equipment’s functionality.

Conformal Coating FAQ

What is a conformal coating?

A conformal coating is a thin, protective film that covers and protects printed circuit boards (PCBs) and other electronic components from damage caused by environmental factors such as moisture, dust, chemicals, and temperature fluctuations.

Why use conformal coatings in electronics?

Conformal coatings enhance the reliability and longevity of electronic devices by providing protection against environmental factors that can lead to corrosion, oxidation, or other damage, ultimately improving the performance and durability of the components.

What are the different types of conformal coatings?

There are several types of conformal coatings, including acrylic, epoxy, silicone, urethane, and parylene. Each type offers specific protection properties and characteristics that make it suitable for different applications and environments.

How is a conformal coating applied?

Conformal coatings can be applied through various methods, such as brushing, spraying, dipping, or selective robotic coating processes. The choice of application method depends on the desired thickness, production volume, and product specifications.

How long does conformal coating last?

The lifespan of conformal coatings varies depending on factors such as the type of coating material, the operating environment, and the device’s usage conditions. Generally, conformal coatings can last several years or even decades in optimal conditions.

Can conformal coatings be removed or repaired?

Yes, conformal coatings can be removed or repaired using specialized techniques and chemicals. The removal process typically involves the use of solvents or mechanical removal methods, while the repair of damaged areas may require removal and reapplication of the coating.

Related Technology Terms

  • Parylene
  • Acrylic
  • Silicone
  • Polyurethane
  • Humiseal

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