When a problem occurs on the coating line and a circuit board is defective there is generally a good reason for the occurence. This week Nexus takes a look at Capillary Flow.
Capillary flow (or scavenging) in conformal coating processing is where the coating pulls or runs away from certain areas of a PCB to more favourable areas.
This is due to a combination of effects which leave a patchy finish on the surface of the board around the defective area.
There are several options to resolve this issue and prevent this occurring in production.
Find out more
In conformal coating there are many common failure mechanisms in conformal coating including capillary flow (scavenging), delamination (loss of adhesion), cracking, de-wetting, orange peel, pin holes, bubbles and foam. This article briefly looks at reasons each of the defects occur in processing with potential solutions to avoid them in the future.
Click FEATURE “Conformal coating Defects – Why Do They Occur?” to read the article.