How is the thickness of the coating film measured? Let's learn more about the method of measuring the thickness of the coating film:
The thickness of the coating film can be measured according to the method in the national standard "Determination of Paint Film Thickness" (GB/T 1761-89). Measured with a lever micrometer or a magnetic Thickness Gauge, expressed in µn.
(1) Instruments and equipment
①Lever Micrometer Accuracy is 2µm.
②Magnetic Thickness Gauge with an accuracy of 2µm.
(2) Measurement method
①A method: lever micrometer method.
a, Calibration of the "o" position of the lever micrometer.
b. Measurement Take the upper, middle and lower positions not less than 1cm away from the edge for measurement. First measure the unpainted bottom plate. In order to reduce the measurement error, you can measure several times at the same position. Then paint the paint sample, dry it according to the specified time, and then measure it at the same position according to the above method. The difference between the two is the paint film thickness. It is also possible to measure the thickness of the painted sample first, then use a suitable method to remove the paint film at the measurement point, and then measure the thickness of the bottom plate, and the difference between the two is the paint film thickness. The arithmetic mean of the thickness of each point is the average thickness of the paint film.
② Method B Magnetic Thickness Gauge method.
First zero, then calibrate, and then measure.
Take the upper, middle and lower positions which are quite a few flcm away from the edge of the template for measurement. Put the probe on the sample board, press the button, and then press the magnetic core to make it completely attracted to the paint film to be tested. At this time, the pointer slowly descends. When the magnetic core jumps into the well and the pointer is stable, the paint film can be read. thickness value. Take the arithmetic mean of the thickness of each point as the average thickness of the paint film.
