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ASTM D1155-10

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Standard Test Method for Roundness of Glass Spheres

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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.

The roundness of glass spheres is one measurable aspect relating to their performance as a retroreflective media. The function of this test method is to measure the percent of true spheres as related to compliance with applicable specifications.

Note 1—This method has been used in other industrial areas outside the intended scope of this test method.

SDO ASTM: ASTM International
Document Number D1155
Publication Date July 1, 2010
Language en - English
Page Count 4
Revision Level 10
Supercedes
Committee D01.44
Publish Date Document Id Type View
July 1, 2010 D1155-10 Revision
May 10, 2003 D1155-03 Revision
Jan. 1, 1994 D1155-89R94E01 Revision
June 1, 2020 D1155-10R20 Reaffirmation
June 1, 2015 D1155-10R15 Reaffirmation