Discolouration of a conformal coating can be a natural phenomenon due to the nature of the resin used. For example, a polyurethane conformal coating will naturally darken and go brown with time due to its inherent properties.
However, 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 can be classed as a defect.
Causes of discolouration in conformal coating include UV light exposure and prolonged exposure to contaminants. But, this problem can be prevented with the right measures.
Click to find out more about discolouration of a conformal coating as a defect and how to prevent it.
Need help with your process?
Contact us at Nexus and we can help solve your issues.