Method 1: Dry film thickness measurement method corresponding to dry film thickness by dry film mass
It is suitable for paint films that are too soft to be measured by instruments. For example, the air-dried paint is in the early stage of curing test panel
This method has poor measurement accuracy but can be used to verify the average paint film thickness between the specified limits; the paint film is not damaged in the side test
Method 2: Measure the dry film thickness with the micrometer method
Primarily applied to test panels or substantially flat painted
Using this method the paint film needs to be hard enough to withstand close contact with the micrometer tip without indentation; the accuracy is +2 kmP7; the paint film is bearded in the side test
Method 3: Dry film thickness on the side of the indicator table
This method is also mainly applied to test panels or substantially flat paints. And the paint needs to be hard enough to withstand no indentation when the presser foot of the instrument is put down; the accuracy is ± 2Wni The paint film is damaged in the side test
Method 4 Measuring dry film thickness by microscopy
Method A paint film thickness measurement accuracy is ± 2.5 microns or more accurate
B method paint film thickness measurement accuracy is ± 1 micron
Cut off a part of a test panel or painted object and bury it in the M purpose. This method is recommended as a referee method and for paint film side disks on variable shape substrates such as shot peened metal;
use a special microscope to observe and measure the thickness of a small part of the paint film longitudinal section removed from the substrate
Method 5 non-destructive instrumental measurement method, this method is suitable for magnetic metal substrates
P-ray backscattering method, which is suitable for non-magnetic metal substrates, mainly used for continuous measurement of moving paint films, such as coil coating paint films
The instrument operates according to:
1) Principle of magnetic flux
2) Eddy current principle port
3) The principle of magnetic attraction separation.
The instrument operates according to the eddy current principle. Use highly specialized instruments with radioactivity. In order to make the test mother accurate paint film needs to be uniform
Method 6: Measurement of wet film thickness
A. Wheel gauge
Suitable for wet film thickness measurement on laboratory test panels or freshly painted surfaces, measurement accuracy is poor, but can estimate the approximate thickness of the film when dry
B. Comb gauge
Suitable for wet film thickness measurement during on-site painting operations, the measured value gives a rough indication of wet film thickness.
Note: In both cases, the dry film thickness should be checked by method 5
The above is a complete collection of methods for measuring paint film thickness, which fully answers the question of how to measure paint film thickness. Do you understand?
