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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 ...
Modern automobile paint is applied in several layers, with a total thickness of around 100 μm (0.1mm). Paint application requires preparation and primer steps to ensure proper application. A basecoat is applied after the primer paint is applied. Following this, a clearcoat of paint may be applied that forms a glossy and transparent coating.
The ability to gauge thickness measurement without requiring access to both sides of the test piece, offers this technology a multitude of possible applications. Paint thickness gauges, ultrasonic coating thickness gauges, digital thickness gauges and many more options are available to test plastics, glass, ceramics, metal and other materials.
The notches are spaced 1/16 inch (1.6 mm) apart. The applicator bar is 5 inches (127 mm) wide and leaves 3 3/8 inches (86 mm) of applied coating behind after use. After the bar is drawn down the card with the coating, a series of parallel stripes with varying film thickness will be formed.
A model surface is painted with the PSP coating with an airbrush or automotive type paint gun. The PSP consists of an oxygen sensitive probe suspended in an oxygen permeable binder. The model is then placed in an oven so the PSP layer can cure. Once cured, the model is placed in a wind tunnel or appropriate test environment.
The first efforts to use ultrasonic testing to detect flaws in solid material occurred in the 1930s. [1] On May 27, 1940, U.S. researcher Dr. Floyd Firestone of the University of Michigan applies for a U.S. invention patent for the first practical ultrasonic testing method.
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