意义和目的
4.1 The roundness of a glass sphere is a measurable aspect related to its performance as a retroreflective medium. The function of this test method is to measure the percentage of true spheres associated with compliance with the applicable specification.

笔记 1: This method has been used in other industrial areas beyond the intended scope of this test method.

美国材料试验协会D 1155-2020 “玻璃珠角度”

范围
1.1 本测试方法 2 covers the determination of the percentage of true spheres in glass spheroids used for reflective marking purposes and for industrial use.

1.2 The test method includes the following two processes:

1.2.1 程序A, where the selected specimens are divided into two size ranges or groups and then separated into true spheres and irregular particles, 和

1.2.2 程序B, where the selected specimens were divided into five size ranges or groups prior to separation.

1.2.3 In determining compliance with the requirements of the code, procedure A or Procedure B may be used. If the test indicates failure to reach the specified percentage of true spheres and irregular particles, a referee test shall be performed according to procedure B.

美国材料试验协会D 1155-2020 “玻璃珠角度”

1.3 以 SI 单位表示的值应被视为标准. 括号内的数值仅供参考.

1.4 本标准并非旨在解决所有安全问题, 如果有的话, 与其使用相关. 本标准的使用者有责任建立适当的安全机制, 健康和环境实践，并在使用前确定监管限制的适用性.

1.5 本国际标准是根据《关于制定国际标准的原则的决定》中确立的国际公认的标准化原则制定的, 世界贸易组织贸易技术壁垒委员会发布的指南和建议.