What is PCB Conformal Coating?
A conformal coating is a polymeric thin film applied over a PCB surface to protect the board and its components from corrosion and environmental contaminants. The performance of a PCB can be impacted by many external or environmental factors like moisture, extreme temperature, salt sprays, and chemicals. A conformal coating ensures the protection of the PCB against these types of environmental contaminants and conditions. By protecting from contaminants and environmental factors, conformal coatings prevent corrosion of conductors, solder joints, and short circuits. They also provide durable insulation to help reduce thermal and mechanical stress on the components. Conformal coatings are an important part of printed circuit boards and are used in a wide range of industries, including aerospace, automotive, military, marine, lighting, consumer electronics, and industrial.
PCB conformal coatings are classified into five main types based on their chemical composition: Acrylic conformal coatings, made from preformed acrylic polymers dissolved in a solvent, are the most used and can be applied by brushing, spraying, or dipping. Polyurethane coatings offer strong resistance to chemicals, moisture, and abrasion, but are difficult to remove and not suitable for spot repairs due to toxic gas emissions. Epoxy coatings, typically two-part thermosetting mixtures, perform well in harsh environments but can damage circuits during removal. Silicone coatings are ideal for high-temperature applications, providing moisture and abrasion protection with low toxicity, and are usually single-component. Paraxylylene coatings are applied through a chemical vapor deposition process, where the material vaporizes, polymerizes in a chamber, and forms a protective film on the PCB.
PCB Directory has listed the leading PCB Conformal Coating companies and made them searchable through their location and capabilities. You can choose a country to filter and find local PCB conformal coating service providers nearby that can process your printed circuit boards. Additionally, you can filter PCB conformal coating companies based on coating type, application methods, and industries. PCB Directory will then optimize the results to display companies that meet your requirements.
