Polyurethane Resin Vs Silicone Resin Conformal Coating Material For Electronics

Conformal coating is a special polymeric film product that keeps circuit boards, components, and other electronic devices protected from environmental conditions that can have adverse effects on them. The coatings are designed to conform to the inherent structural irregularities of circuit boards and offer increased dielectric resistance and protection against humidity, fungus, heat, corrosion, and contaminants like dust and dirt. Conformal coatings also enhance the operational integrity of the devices.

Different technologies are used to achieve the protective coatings, and your choice will depend on the protection levels needed for the assembly. Traditional coatings are basically 1-part systems with resin bases and can dilute in solvents. These traditional coatings do not completely seal the electronics because they are semi-permeable. They offer much-needed protection without interfering with the circuit boards’ operation.

The chemical composition of each material determines its functions and attributes. It means that what fits one application might be a challenge for another. It is important to select the best conformal coatings according to the operational requirements of the electronics at hand. Silicone and polyurethane conformal coatings are the most popular. By comparing them, you should be able to decide which is best for your needs.

Polyurethane Resin 

Polyurethane resin coating offers elasticity and protection levels that are fair. This coating can be recognized by its high dielectric strength, abrasion, and moisture resistance. Compared with other resins, polyurethane coating removal distinguishes it most. The coating is easy and quick to remove, considering it is not resistant to solvents. Even with the most basic solvent, you will not need to agitate it to remove it effectively. For this reason, field repair and reworks are made easy, economical, and practical.

But without protection against solvents, the coatings are not ideal for applications that involve things like pumping gadgets. The coating can be considered to be entry-level in terms of the protection it offers, especially because of its ability to protect against an impressive range of contamination and its economic aspect. You should consider another conformal coating like silicone if you are looking for superior protection and not just dielectric strength.

Silicone resin 

Silicone coating, on the other hand, covers a wide temperature range in terms of protection. It is the best for devices likely to be used in extreme temperatures and environments with high humidity levels. This conformal coating also has impressive chemical resistance and flexibility and is resistant to salt spray and moisture. Its rubbery nature does not give it very good abrasion-resistant qualities, but it gives it resilience against stresses like those that are vibration related.

The best thing about this protective coating is that it can be tweaked to get formulations suitable enough to coat things like LED lights without affecting the color or intensity; it is a popular choice for applications like outdoor signs. Removing the coating can be challenging, requiring special solvents, long soaks, and agitation. In most cases, ultrasonic baths and brushes are needed to agitate and remove effectively.

The more you know about conformal coatings, the easier it should be to find the most suitable for your application requirements.

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