Waterproof PCBs with Parylene Coating

Posted by Jake Hinojoza on Sep 14, 2022 2:35:00 PM
Jake Hinojoza

Printed circuit boards (PCBs) are the backbone of most electronic devices, but they are vulnerable to moisture and other environmental threats. Moisture can cause significant damage to a PCB, leading to malfunction or even failure. That's why it's essential to protect your PCB from the elements, and Parylene coating is the ideal solution for waterproofing.

We'll cover everything you need to know about waterproofing PCBs with Parylene coating, including what it is, its advantages, and how it works.

What is Parylene Coating?

Parylene is a thin, transparent, and conformal polymer coating that provides excellent moisture and chemical protection. The coating is created by depositing a vaporized form of the polymer onto the surface of the PCB, which then adheres to all areas of the board, including crevices and corners. Parylene coating is lightweight, flexible, and provides complete coverage, making it ideal for waterproofing PCBs.

Advantages of Parylene Coating for Waterproofing PCBs

Parylene coating offers several advantages for waterproofing PCBs, including:

  1. Comprehensive Coverage: Parylene coating adheres to all surfaces, including areas that are difficult to reach, providing complete coverage and protection.

  2. Lightweight and Thin: Parylene coating is incredibly thin and lightweight, ensuring that it does not add any significant weight or bulk to the PCB.

  3. High Chemical Resistance: Parylene coating offers excellent resistance to chemicals and solvents, protecting the PCB from damage caused by exposure to chemicals.

  4. Low Moisture Vapor Transmission Rate (MVTR): Parylene coating has an extremely low MVTR, which means it provides excellent protection against moisture.

  5. Ease of Repair: In case of any damage to the coating, Parylene is easy to repair without having to remove the entire coating.

How Parylene Coating Works for Waterproofing PCBs

Parylene coating is applied using a vapor deposition process, which involves placing the PCB in a vacuum chamber and vaporizing the Parylene polymer. The vaporized polymer then coats the surface of the PCB, forming a thin and conformal film that adheres to all surfaces, including small crevices and corners.

The Parylene coating process allows for complete coverage of the PCB, providing a protective barrier against moisture, chemicals, and other environmental threats. Additionally, Parylene coating is thin and lightweight, ensuring that it does not add any significant weight or bulk to the PCB.


Waterproofing PCBs is essential to ensure their longevity and performance. Parylene coating offers the ideal solution for protecting your PCB from moisture and other environmental threats. Its comprehensive coverage, lightweight and thin nature, high chemical resistance, and ease of repair make it the perfect choice for waterproofing PCBs.

If you're looking for a reliable and experienced provider of Parylene coating services for your PCB, look no further. Our team of experts can help you choose the right coating for your needs and ensure that your PCB is protected from the elements. Get in touch with us today to learn more about our Parylene coating services.

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Topics: Parylene Conformal Coating, Waterproofing