Parylene Chemical Resistance Properties – Overview
Choosing a conformal coating can be a complex decision that entails understanding the environment your electronic products will be operating in and taking stock of the threats to reliability associated with that environment.
Considerations may include the operational temperature range for a component – will the coating you choose maintain performance throughout this range? Will your product be exposed to high levels of corrosives, humidity, or even immersion, requiring a coating with strong barrier properties? Will the environment entail exposure to various chemicals? If so, Parylene’s superior chemical resistance properties may present an ideal solution for your application.
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Parylene Coating Chemical Resistance
Chemically inert Parylene conformal coatings exhibit exceptional resistance to solvents at room temperature, maintaining this property to up to 150° C. This resistance prevents erosion, delamination, and other minimizations of coating effectiveness, ensuring dependable performance. Additionally, Parylene coatings are highly resistant to inorganic reagents, including alkali and strong acids.
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Parylene coating has excellent chemical resistance to solvents and reagents, including those listed below:
|Acids, Bases, Corrosives|
|Hydrochloric acid, 10%|
|Sulfuric acid, 10%|
|Nitric acid, 10%|
|Hydrofluoric acid, 10%|
|Sodium hydroxide solution, 10%|
|Ammonium hydroxide solution, 10%|
|Hydrogen peroxide in water (H2O2)|
Watch Dr. Sean Clancy expand on Parylene chemical resistance in his webinar
The exceptional chemical resistance of Parylene is one of the many beneficial properties that sustain component performance for the length of its expected lifecycle.
Parylene C Chemical Resistance
Parylene comes in various types, including Parylene N, C, and F (VT-4), and each type has unique properties, ensuring an appropriate Parylene for every project. Parylene C coatings specifically survive exposure to the corrosive liquids and solids mentioned above and much more. Parylene C has excellent chemical resistance to most solvents and reagents used in processing electronics and other products, including (dilute / ~10 % concentration) acids, bases, as well as organic solvents, such as isopropyl alcohol.
Why is Parylene Chemical Resistance so High?
Parylene’s exceptional chemical resistance is partially due to the unique vacuum deposition method used to apply the coatings, chemical vapor deposition (CVD). In this vapor phase coating process, the polymer chains pack tightly against one another, making Parylene resistant to chemicals passing through the coating and reacting with the film.
In comparison to liquid-derived and assembled monolayers, the chemically stronger film consistency is the source of Parylene’s chemical/solvent resistance.
Typical Parylene deposition process, illustrated with Parylene N
Download our infographic for an illustrated guide to CVD
If you would like to learn more about Parylene coatings, please visit our Parylene page, or explore one of our webinars for an in-depth discussion about Parylene delivered by one of our engineers. If you have decided Parylene is a strong choice for your application, please reach out to our application engineering team today for a no-pressure consultation and understand our unique manufacturing advantages.
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