Parylene coating

The problems of masking and de-masking Parylene on a circuit board assembly compared to traditional liquid conformal coating

There are several reasons why Parylene conformal coating has a more difficult masking and de-masking process compared to normal liquid conformal coatings.

These reasons include:

Five key facts about Parylene for protecting electronic circuit boards

Parylene is a high performance coating used to protect electronic circuit boards against environmental attack.

It is an organic polymer thin film that 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).

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