Two methods for measuring the wet film thickness of the coating In the paint engineering, it is often necessary to measure the wet film thickness of the coating. The measurement of the wet film thickness has a precondition. It is necessary to carry out the wet film measurement immediately after the preparation of the paint film, otherwise it will Due to the volatility of the solvent and evaporation of the water, the film shrinks and shrinks. At that time, it is not the thickness of the wet film. If it is accidentally turned into a dry film thickness, it is possible to measure the vibrometer. Therefore, how to measure the wet film thickness of the coating is especially important!
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Method for measuring wet film thickness GB/T 13452.2-92 states that one method is to use a wet film thickness gauge (comb gauge) or a wet film wheel (wheel gauge), while the old American ASTM D1212-79 specifies the use of wet The film thickness gauge (comb gauge) and the Pfund wet film meter were used to measure the wet film thickness. Specifically:
First, measure the wet film thickness with a wheel gauge The wheel gauge is basically composed of three discs, one whole, the outer two discs are also large and flat, the middle disc is eccentric, and the semi-vibrometer is short, so that the three discs Tangent at a certain radius (ie on the same plane), so that the gap there is zero. In the opposite radial direction, the interval is the largest. The leveler has a scale on the outside of the disc to indicate readings for different gaps. During the test, the instrument must be perpendicular to the surface to be tested, and it should not be shaken left or right. Otherwise, incorrect results will be obtained. In addition, the instrument will roll on the surface. If it starts from zero, the paint will be pushed due to the extrusion of the wet film. Previously, the resulting thickness reading will be greater than the actual wet film thickness, resulting in some error in the results.
Second, the use of comb gauge to measure the wet film thickness comb a portable metal or plastic sheet, the shape of a square or rectangular, as shown in Figure 3. The teeth with different readings are cut on the four sides, the two ends of each side are on the same horizontal plane, and the middle teeth are different from each other in the gap. When in use, it is in vertical contact with the test surface so that a part of the teeth are wetted by the paint film. The wet film thickness is the reading between the last tooth and the next unwetted tooth. The comb gauge is a simple and inexpensive measuring instrument, especially suitable for use on the construction site.
The above information comes from the mixer North and South Chaos Mall, more information about the wet film measuring instrument, you can browse: http://
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