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ASTM International, 06/01/2020
Publisher: ASTM
File Format: PDF
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Published:01/06/2020
Pages:5
File Size:1 file , 170 KB
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1.1 This test method2 covers the determination of the percent of true spheres in glass spheres used for retroreflective marking purposes and industrial uses.
1.2 This test method includes two procedures as follows:
1.2.1 Procedure A, in which the selected specimen is split into two size ranges or groups prior to separation into true spheres and irregular particles, and
1.2.2 Procedure B, in which the selected specimen is split into five size ranges or groups prior to separation.
1.2.3 In determining compliance with specification requirements, either Procedure A or Procedure B may be used. Where tests indicate failure to meet the specified percent of true spheres and irregular particles, the referee test shall be made in accordance with Procedure B.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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