What is capillary flow in conformal coating and why does it occur?
Capillary flow (also known as scavenging) in conformal coating is where the conformal coating pulls or runs away from certain areas of a PCB to more favourable sectors due to a combination of effects. This can leave a patchy finish on the surface of the board.
Factors that influence the capillary effect during processing include:
- low viscosity of the conformal coating
- an abnormally high amount of coating applied
- a low surface energy of substrate
- the high surface tension of the conformal coating.
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