Dry Film Coating Thickness Instruments

All coating thickness gages are influenced to some degree by substrate roughness, as shown in the below image. It is generally accepted that paint thickness should be measured from the highest &#;peaks&#; in the rough surface thus ensuring they are covered by the protective coating. However, coating thickness gages will instead measure the coating thickness from the &#;effective magnetic plane&#;, which is located somewhere between the highest peaks and deepest valleys of the profile.

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ASTM D, ISO , and SSPC-PA 2 propose several similar solutions depending upon the instrument type and the particular situation. One option is to verify the paint meter reads zero on the uncoated steel substrate, and adjust to zero if necessary. This is a popular solution when the metal surface is smooth.

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Since it is difficult to ensure that the probe tip is sitting on the highest peaks of the surface profile, the preferred option is to place a plastic shim of a known thickness that is close to the expected thickness of the applied coating between the probe and substrate and adjust to the stated thickness of the shim- referred to as a 1-point adjustment. The plastic shim sits on the peaks of the surface profile over a greater area than the probe tip, ensuring that the adjustment is being taken &#;over the peaks&#;. This best simulates a coating covering the peaks of the surface profile.

If access to the bare substrate is not possible, another option is to use the PosiTector Zero Offset feature in accordance with ISO . The Zero Offset adjustment is useful when measuring paint and coating thickness over rough or blasted substrates without access to the uncoated representative substrate. Predefined Zero Offset values can be selected according to the blast profile height. Alternatively, a custom Zero Offset can be entered.

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