Designing for Selective Robotic Conformal Coating Processing: Rule 2

Conformal Coating materials are liquids that flow in unpredictable ways on a circuit board due to surface tension affects.  These problems with flow can create defects like capillary (scavenging) and unwanted flow into connectors. Therefore, consider the following rule.

Rule 2

Maintain a minimum 2.5mm distance between MUST coat areas and MUST NOT coat areas.  If you do, be prepared for production people to attack you with a pitch fork as it may not be possible to prevent the liquid flowing into restricted areas.

The Rules

The Rules for Selective Conformal Coating are straightforward. Follow them and you can save money and time in your application process. However, if the Rules are not followed, the resultant circuit board design can challenge even the most sophisticated conformal coating system and its operator to achieve the finish desired.

Click Designing Circuit Boards for Selective Robotic Conformal Coating for further Rules.

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About Dr Lee Hitchens

Dr Hitchens has been working in the electronics industry and the area of conformal coatings for over 25 years in various areas including sales and technical support. He has also been training people for almost the same amount of time in all areas of conformal coating whether that is materials & equipment selection, process development or troubleshooting to help them solve their particular problem. Recently, he decided that the industry needed a specific place where all of the useful knowledge on conformal coatings could be collated for users to find easily and use in their own production process. So, Nexus was born and he began the Nexus eBook project.

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