A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. The values given in parentheses are for information only. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulatory limitations prior to use.
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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. The values given in parentheses are for information only.
It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulatory limitations prior to use. Referenced Documents 2. Summary of Test Method 3. The instrument must be placed directly on the coating surface to take a reading. Current edition approved Nov. Published January Originally published as D — Last previous edition D — The extent of such changes is dependent upon the distance between the probe and the metal, and the distance being shown on the instrument meter as thickness mils or microns of the intervening coating.
Apparatus 5. Test Specimens 6. NOTE 2—Coatings should be applied in accordance with Practices D , or as agreed upon between the purchaser and the seller. To guard against measuring with an inaccurate gage, recheck the gage at regular intervals. That interval should be set and maintained throughout the control process. Procedure 8. Otherwise erroneous readings can result.
Verify calibration periodically to ensure that the instru- ment continues to read properly. If the instrument is found to be out of adjustment, remeasure the thicknesses taken since the last satisfactory calibration check was made. Report 9. Precision and Bias Data are being analyzed statistically. When com- pleted, the required repeatability and reproducibility sections of this test method will be written and the round-robin study documented in an ASTM research report.
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More D Another effect can be veiling glare, as occurs in an automobile windshield when driving into the sun. The use of a spectrophotometer for haze measurement of plastics can provide valuable diagnostic data on the origin of the haze,4 and Procedure B is devoted to the use of a spectrophotometer. However, when the specimen is hazy, the total hemispherical luminous transmittance must be measured by placing the specimen at the entrance port of the sphere. The measured total hemispherical luminous transmittance will be greater than the regular luminous transmittance, depending on the optical properties of the sample. With this test method, the specimen is necessarily placed at the entrance port of the sphere in order to measure haze and total hemispherical luminous transmittance.