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1.1 This test method 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
Other DocumentASTM MNL32 Manual on Test Sieving Methods
ICS Number Code 81.040.30 (Glass products)
UNSPSC Code 30171700(Glass products)
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ASTM D1155-10, Standard Test Method for Roundness of Glass Spheres, ASTM International, West Conshohocken, PA, 2010, www.astm.orgBack to Top