Standard Test Method for. A number in parentheses indicates the year of last reapproval. A thickness range of 0. No other units of measurement are included in this standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Referenced Documents.
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Standard Test Method for. A number in parentheses indicates the year of last reapproval. A thickness range of 0. No other units of measurement are included in this standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Referenced Documents. Current edition approved July 1, Published July Originally approved in Last previously edition approved in as D — DOI: Summary of Test Method.
The travel time is converted into a thickness reading. The instrument must be placed directly on the coating surface to take a reading. United States. A rough surface has a tendency to scatter the ultra- sonic pulse and odd readings may occur occasionally. Some instruments have the ability to detect and measure the individual layer thick- nesses in a multi-layer system. Test Specimen.
N OTE 1—Coatings should be applied in accordance with Practices D , or as agreed upon between the purchaser and the seller. While this is a destructive test method, it will provide an alternative test method to ensure measurements made in accordance with this test method are in the correct range. Water is ideal for smooth, thin coatings. For rough coatings, a glycol gel is best, provided it is not a contaminant for the coating to be measured.
Other liquids such as liquid soap may be used. Hold the probe steady during the measurement. Select the method most appropriate for the material being tested. For rough substrates or. Therefore the. Precision and Bias 4. Each of eight laboratories tested seven different coated panels using two types of instrumentation.
All laboratories reported two replicate test results for every panel with each instrument. Practice E was followed for the. Panel Average A Repeatability Standard. Repeatability Reproducibility. Panel Average A.
These seven coated panels were described as the following:. For best accuracy, each instrument should be checked against a known thickness of the particular coating being measured and adjusted if necessary. Approved July 1, ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
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