ASTM D7635/7635M Measurement of Thickness of Coatings Over Fabric Reinforcement
ASTM D7635/7635M test method determines the thickness of a coating over fiber or fabric. The thickness is measured using a micrometer, and the material is closely observed for its specifications under a microscope. The final results of this test method are expressed in SI units or inch-pound units.
Scope:
ASTM D7635/7635M test method determines the thickness of various coatings. This is done by measuring their magnification, calibration, and resolution with the help of a microscope. The results help specify the coatings’ application, quality, reliability, performance, and durability. Moreover, research can be conducted, and developmental standards can be devised to improve the performance of various coatings.
Procedure:
In the ASTM D7635/7635M test, the specimen is prepared by cutting it from the plane of the available sheet. The specimen is weighed, placed in the sample cup, and observed closely by placing it under a microscope. A micrometer is used to measure the thickness of the sample up to 10µm. The digital images of the sample are taken by placing the calibrated scale marker on the microscope. These pictures further study the resolution, calibration, and magnification.
Also read: What is a Coating Thickness Gauge?
Specimen Size:
The specimen used in ASTM D7635/7635M testing is taken per the requirements.
Data:
The overall thickness of the sample is reported to the nearest 10µm, and reproducibility limits are devised (denoted by R).
Conclusion:
ASTM D7635/7635M test method determines the thickness of various coatings.
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