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The first ultrasonic thickness gauge was made in 1967 by Werner Sobek; [citation needed] a Polish engineer from Katowice. This first ultrasonic thickness gauge measured the velocity of the waves it emitted in particular test samples, it then calculated the thickness in micrometers from this speed measurement by an applied mathematical equation.
Dry film conformal coating thickness measurement. An alternative to wet film measurement is by using eddy currents. The system works by placing the test head on the surface of the conformal coating. When liquid water is present, a pinhole can form in the coating. This is considered a defect and can be eliminated with appropriate steps and training.
A standard procedure for testing substances that are applied in a liquid form, and then dry to a solid film, is to create a controlled, standardized test film of the substance, usually on a standardized substrate, such as a metal, plastic or paper panel.
ISO 3233-1:2019 Part 1: Method using a coated test panel to determine non-volatile matter and to determine dry-film density by the Archimedes' principle ISO 3233-2:2019 Part 2: Method using the determination of non-volatile-matter content in accordance with ISO 3251 and determination of dry film density on coated test panels by the Archimedes ...
For example, if the paint is applied in a wet film at a 100 μm thickness and the volume solid of paint is 50%, then the dry film thickness (DFT) will be 50 μm as 50% of the wet paint has evaporated. Suppose the volume solid is 100%, and the wet film thickness is also 100 μm.
The Calo tester, also known as a ball crater or coating thickness tester, is a simple and inexpensive piece of equipment used to measure the thickness of coatings.Coatings with thicknesses typically between 0.1 to 50 micrometres, such as Physical Vapor Deposition (PVD) coatings or Chemical Vapor Deposition (CVD) coatings, are used in many industries to improve the surface properties of tools ...