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February 27 - March 3, 2017

Where are errors most likely to occur when measuring dry film thickness on steel, and how can they be avoided?

Selected Answers

From Craig Gordon of Helmut Fischer AG on March 3, 2017:
1. Calibrating on a flat surface and then measuring on surfaces with significant curvature. 2. Measuring close to an edge with a probe not suitable for this.

From amar jit singh of NIC T Pune on March 3, 2017:
When checking the dry film thickness, the measurement must be set on same metal surface and of similar shape or profile. Otherwise, there are chances of obtaining the wrong results.

From Steve Brunner of WPC Technologies on February 27, 2017:
Simon has touched on the two most critical aspects of assuring accuracy. I will add two more. The first is when calibrating the instrument, one needs to choose thickness shims in the range of the anticipated DFT. The other is when checking a structure with a slight curvature, the blasted material with which you zero the instrument should have the same curvature.

From Simon Wadsworth of COWI on February 27, 2017:
1. Not allowing for the cured film still being relatively soft albeit that it is ready for over-coating. This causes the 'dimple' of the thickness measuring device to indent the paint film, causing an under reading. Can be solved by using a thin plastic shim of known thickness between the device and the paint film. 2. Not calibrating the measurement against a blast profile (and material) matching that used in production. Can be solved using test plates blasted from the same material and method as in production.

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Tagged categories: Coating / Film thickness; Dry Film Thickness (DFT); Quality Control; Quality control

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