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by Ron Joseph July, 2006 Measuring Dry Film Thickness (DFT) Over Abrasive Blasted Steel
Q: When measuring the DFT (50-75microns) of a primer applied over sand blasted steel with a surface profile of 50-75microns what effect does the profile have - would you expect the readings to be from 100 - 150mics? A: Depending on the diameter of the film thickness measuring probe, you are probably only measuring the DFT above the peaks of the profile. Therefore, 50-75 microns is probably the thickness of the primer over the peaks. You can confirm this by spraying out a sample of the same primer on a piece of flat steel and comparing the film thickness over both substrates.
Best wishes, Ron Joseph | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
