Parylene is an organic polymer conformal coating. It is generically known as Poly (p-xylylene).
This thin film coating is linear, amorphous and crystalline (10%), when in polymer form.
The Parylene film is created via a controlled Chemical Vapor Deposition (CVD) process.
This involves the vaporization and subsequent pyrolysis of a feedstock (Dimer), resulting in the formation of a monomer that is then polymerized in a vacuum chamber (at low pressure and at room temperature).
It is not a liquid coating like typical acrylic and urethane conformal coatings. It is not therefore processed like standard liquid conformal coatings.
The ABCs of Parylene
Parylene is unique as a barrier film. Few other conformal coatings can match the performance offered by Parylene.
The Parylene film is created using a Chemical Vapor Deposition (CVD) process. This involves processing in a vacuum chamber.
This is very different to the normal liquid conformal coatings that are applied by wet techniques such as brushing, dipping and spraying.
This gives Parylene unique unmatched properties compared to normal liquid conformal coatings.
Five key facts about Parylene
- Parylene is unique as a barrier film.
- The thin film coating Parylene forms is linear, amorphous and crystalline. This gives the coating the unique properties.
- To achieve this effective protection, the Parylene film is applied via a Chemical Vapor Deposition (CVD) process.
- This involves the deposition of the coating in a vacuum chamber.
- Due to the material nature and the application process few other conformal coatings can match the performance offered by Parylene.
Three important points you should know about Parylene
- The Parylene application process uses a technique called Chemical Vapor Deposition (CVD).
- The CVD process applies a dry film in a vacuum chamber. This is completely different to normal liquid conformal coatings that can be brushed, dipped or sprayed.
- This alternative material and application process makes Parylene a highly effective moisture and dielectric barrier that outperforms nearly all thin-film conformal coatings.