What is discolouration of a conformal coating and why does it occur?

Discolouration is when there is a change in the color or loss of transparency of the conformal coating.

This defect adversely affects the performance or the identification of the components covered by the coating.

Factors that cause discolouration can include:

• UV light exposure
• Contamination
• Time on the circuit

Some ways to prevent discolouration from occurring are:

• Eliminating the UV light
• Applying the correct coating
• Ensuring a clean environment

Read more on Conformal Coating Defects: Discolouration