Designing for Selective Robotic Conformal Coating Processing: Rule 1

When you are considering the board design for applying the conformal coating using a robot system then consider how you want the board to be coated? Must all of the PCB be coated? What areas are critical and what must not be coated? Are there areas where it doesn’t matter if coating is there or not?

Rule 1


Designate three areas on a conformal coating diagram. These are:

  •         Areas that MUST be coated
  •         Areas that MUST NOT be coated
  •         Areas where it doesn’t matter (coating is optional).

Breaking the PCB into these three areas allows application engineers to understand the priorities of the protection required for the coating, especially where coating doesn’t. Removing the ambiguity from the process creates focus on what really matters.

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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