There are several methods for measurement of conformal coating thickness and they fall into two categories. These categoris are wet film & dry film conformal coating measurements.

Wet Film Conformal Coating Measurement

The wet film conformal coating thickness method ensures quality control while the coating is still wet.

Applying too much coating can be expensive. Also. wet film measurements are useful for conformal coatings where the dry film thickness can only be measured destructively or over application of conformal coating could be problematic.

The wet film gauges are applied to the wet conformal coating and the teeth indicate the thickness of the conformal coating. The dry film thickness can then be calculated from the measruement

The wet film gauges are sold in bags of 200. Contact SCH for further details.

Wet Film Conformal Coating

Thickness Measurement

Dry Film Conformal Coating Thickness Measurement

Positest Conformal Coating System

An alternative method to wet film measurement is using a non contact technique using eddy currents. A system like the Positest offered by SCH is extremely quick and accurate to ±1 um.

Placing the test head on the surface of the conformal coating, the measurement is almost instantneous and provides an immediate repeatable result for thickness measurement of conformal coating.

Test coupons are the ideal method for measuring the coating thickness, whether is it spraying or dipping, and can be kept as a physical record of the performance. Apply the coating to the test coupons at the same time as the circuit boards provides a permanent measurement and an accurate guide to the coating thickness.

Contact SCH for further details on the Positest Conformal Coating Thickness Measurement system

Positest Conformal Coating

Non Contact System