Designing for Selective Robotic Conformal Coating Processing: Rule 11 “Why do you want to coat the edge of a circuit board”
Conformal coating works by protecting the components and stopping conduction through leakage between leads and devices. Most of the time the edge of the circuit board does not need to be coated. So, why specify that it should be?
Make coating the edge of a PCB optional – it is tricky and messy, especially if there is no frame or breakout around the board, and is of questionable efficacy in improving coating or reliability performance.
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.