ASTM D7635/7635M-10 Measurement of Thickness of Coatings over Fabric Reinforcement

ASTM D7635/7635M-10 Measurement of Thickness of Coatings over Fabric Reinforcement

ASTM D7635/7635M-10 test method determines the thickness of 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.


    ASTM D7635/7635M-10 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 application, quality, reliability, performance, and durability of the coatings. Moreover, research can be conducted, and developmental standards can be devised to improve the performance of various coatings.  


    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 the 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 are further used to study the resolution, calibration, and magnification. 

    Specimen size:

    The specimen is taken as per the requirements. In this case, the sample with dimension 3.175 cm is taken. 


    The overall thickness of the sample is reported to the nearest 10µm, and reproducibility limits are devised denoted by R.


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