Posted by Jake Hinojoza on Jul 2, 2019 9:00:00 AM

PCB conformal coating protecting

Conformal coating, applied as a liquid coating resin, is used for protection against issues in PCB (printed circuit boards) such as:

  • dust
  • moisture and humidity
  • mold and mildew
  • extreme temperatures
  • particulate contamination
  • mechanical stress

The coating can be applied via brushing, dipping, or spraying, and come in acrylic, silicone, urethane, and epoxy. The application type depends entirely on the material type. The various application materials for coating offer different benefits, such as unique coating thicknesses that will serve certain materials better than others. Here are a few of the other benefits of each.

Acrylic or AR works well for moisture protection and to guard against fungus. It is easy to apply and cures in 30 minutes.

Silicone or SR has excellent high-temperature resistance. It also adheres well to PCB components and has high resistance to corrosion and humidity.

Urethane or UR are best known for great dielectric properties and excellent resistance to chemicals and humidity, as well as mechanical resistance.

Epoxy or ER are reliable for abrasion resistance, in addition to great performance in harsh conditions. They resist humidity and moisture well.

Of course, even though each coating has pros, there are drawbacks to each as well. Various coatings are easier or more difficult to apply and/or remove, so that must be taken into account in the context of each application.

Parylene Benefits

In contrast, parylene offers an alternative to liquid coatings that is ultimately the thinnest available. It's resilient, dielectric, and uniform, and can be applied to any surface or shape. This makes it far more versatile than liquid coatings. It is functional in any environment and works for the greatest range of products and devices.

Want to learn more about conformal coatings? Need to talk through the right application for your specific needs? Advanced Coating has the expertise to assist you on this and any other parylene coating questions you might have. Contact us today to learn more!

Jake Hinojoza

Written by Jake Hinojoza

Jake received his Bachelors of Business Administration from California State Polytechnic and has been with Advanced Coating since 2009.

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