Definition
Author
- Dr Lee Hitchens, Nexus
A change in the colour or loss of transparency of the conformal coating that adversely affects the performance or the identification of the components below the coating.
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Causes of discolouration in conformal coating
Factors that can influence discolouration include:
- UV light exposure: Damage from UV radiation, like sunlight, from prolonged exposure can change the colour of a coating.
- Contamination: Prolonged exposure to particulates and dust that stick to a tacky surface.
How to prevent discolouration in conformal coating
It is possible to minimise conformal coating discolouration effects:
- Eliminate the UV light: Don’t expose the conformal coating to prolonged UV light radiation.
- Correct Coating: Use a UV stable conformal coating.
- Clean Environment: Prevent the circuit from getting covered in contamination.
Download our PDF guide Solving conformal coating problems in the application process now.
Links
Blistering | Blushing | Bubble | Contamination |
Capillary Flow | Corrosion | Cracking | Delamination |
De-wetting | Discolouration | Fish Eyes | Layering |
Mealing | Orange Peel | Shadowing | Uneven coating |