What is Parylene?

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Parylene is a trade name for a variety of chemical vapor deposited (CVD) poly(p-xylylene) polymers used as both moisture and dielectric barrier films.

The actual material is deposited as a gas in a vacuum chamber.

Therefore it is a completely different dry process compared to the standard “wet” liquid conformal coatings.

Parylene has properties that offer many different advantages and disadvantages compared to liquid conformal coatings.

For, example, since it is deposited as a gas its thickness is uniform across the circuit board. This makes it a more effective protective barrier compared to liquid materials.

However, since it is applied as a vapour then it will get everywhere on the circuit board. This means masking has to be perfect. This can increase costs significantly.

Other advantages include:

  • Very low permeability
  • High solvent protection
  • Excellent electrical properties
  • 100% clarity
  • Room temperature deposition
  • Excellent penetration
  • Inert in nature
  • Good Thermal Properties
  • FDA approval

However, there are several disadvantages that you must consider so a balance once again is required.


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