ASTM D7971-15
- Standard Guide for Measuring Roundness of Glass Spheres Using a Flowing Stream Digital Image Analyzer
- standard by ASTM International, 04/01/2015
- Category: ASTM
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1.1 This guide covers the determination of the roundness of glass spheres used in pavement marking systems using a flowing stream digital analyzer. Typical gradations for pavement marking systems are defined in ranges from Type 0 through 5 in AASHTO M247.
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