How do I measure conformal coating thickness on a circuit board when it is dry?

Positester conformal coating thickness measurement system roundedThere are several techniques that can be adopted including micro section, using a micrometer screw gauge or measuring using an eddy current system like a positector.

Sectioning is clearly a destructive test and can be difficult, time-consuming and costly. The reality is that if you want a quick indication of the coating thickness on a circuit board then using a micrometer or an eddy current system is easier.

The key to both been successful is having enough flat surface to make the measurement. This isn’t automatic but for both techniques you need enough space to allow the points of contact to sit correctly. Then, the measurement is fairly straightforward.

If this space is not available then standard practice is to use a test coupon and coat that at the same time as the PCB. This will then give an indication of the coating thickness relative to the circuit board.

Click conformal coating thickness testing for further information.

Or, contact us here at +44 1226 249019 or email


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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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