How to avoid de-wetting of conformal coating

De-wetting is the where the conformal coating material refuses to wet the surface of the circuit board that it has been applied to in an even way. The coating ends up being patchy.

The de-wetting effect tends to act locally due to local contamination.But, it can be a global affect right across the board.


De-wetting of the conformal coating can be localised or all over the circuit board.

There are many causes of De-wetting in Conformal Coating.

These include contaminants such as residues and oils, and processes such as soldering and cleaning.

To find out more click conformal coating de-wetting.

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Troubleshooting: Fisheyes

fisheye defects found on a conformal coated circuit boardFisheyes is a localized de-wetting defect that looks like craters on the surface of the conformal coating.

These are normally caused by a contaminant that was present on the surface before the conformal coating application.

Cleaning the surface of the circuit board is crucial in preventing the fisheye defect.

Read more on Conformal Coating Defects: Fish Eyes

Who is Nexus?

Nexus brings together the accumulated knowledge of a group of conformal coating and electronics material dispensing consultants who provide a unique service, focused on helping electronics manufacturing clients improve their conformal coating and electronics materials processes.

Nexus operate across North America, Europe and Asia and can provide a unique perspective to the rapidly growing conformal coating and electronics materials industry. Expertise is held in liquid and parylene coating, capital equipment sales and specifications and material, equipment and process specification, troubleshooting and training.

Nexus August Feature available for Conformal Coating Defects: Definitions and images of common conformal coating failure mechanisms

Each Month Nexus examine an important issue in conformal coating that is relevant to users, suppliers and distributors alike.
In August Nexus investigates key conformal coating inspection issues faced today by users and suppliers of conformal coatings, services and equipment. Experts in the area will be asked to point across their viewpoint and key areas of interest will be reviewed with a jargon busting area.
One of August’s features with Nexus wasConformal Coating Defects: Definitions and images of common conformal coating failure mechanisms. Nexus examines the defects you can find in conformal coating so you can recognise what your problem is!

Click Nexus Conformal Coating Defects: Definitions and images of common conformal coating failure mechanisms to access the article.

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