The material also has good adhesion properties with PCB materials aiding application. In addition, silicone provides excellent resistance against moisture and corrosion and good resistance to chemical contamination. The main characteristics of Silicone-based conformal coatings are their retained elasticity following curing, which offers good protection against the effects of vibrations and high mechanical stress levels on circuit boards. These constraints can limit the suitable applications for this type of coating. The downside to this affordable and practical solution is that the coating offers little or no resistance to solvents and is adversely affected by temperatures above 250 degrees Fahrenheit (125 degrees Centigrade). They are also simple to remove using a non-aggressive solvent like isopropanol if the circuit board needs to be modified or repaired.Īcrylic resins protect against moisture for the long term and resist ultraviolet (UV) exposure well, making them ideal for circuit boards exposed to direct sunlight. You can apply this coating using various techniques, including dipping, spraying, or brushing. The main characteristics of Acrylic-based conformal coatings are their low cost and ease of application making them ideal for hobby electronics. Here we look at the market's five main conformal coating types: Acrylic, Silicone, Polyurethane, Epoxy, and Parylene-based. Conformal Coating TypesĮvery kind of coating has unique properties and characteristics suitable for specific applications. This article aims to explain precisely how conformal coating will benefit you and which type is the best option for your specific application.
There are several types of conformal coating, and each has unique characteristics, properties, and benefits. This protection consequently improves the reliability of your device, reducing costs associated with replacing hardware that has prematurely failed. The key benefit of applying a conformal coating is that the protection will extend your circuit board's life and reduce component failure rates due to environmental factors. Conformal coatings also have thermal and electrical insulation properties to help manage your circuit's operating characteristics. It protects circuit boards and components against various environmental factors, including heat, humidity, moisture, ultraviolet light, chemical contaminants, and abrasive materials. Conformal coating is a lightweight material applied to PCBs that acts as a protective layer.
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