Discolouration

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.

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