ASTM D5644-18

4.1 The particulate size distribution of vulcanizate particulate rubber is used for the purpose of assigning a product mesh or average particle size designation.

4.2 The product designation for mesh size for the Ro-tap method is based on the size designation screen which allows a range for the upper limit retained of maximum 5 % for up to 850 μm (20 mesh) particles, maximum 10 % for 850 to 150 μm (20 to 100 mesh), and maximum 15 % for 125 to 20 μm (120 to 635 mesh). No rubber particles shall be retained on the zero screen (see Table 2, Classification D5603).

4.3 The weight percent retained on a specific screen is noted.

1.1 This test method describes the procedures for determining average particle size distribution of recycled vulcanizate particulate rubber by the Ro-tap sieve test method for 90 μm (170 mesh) or larger particles.

1.2 The values stated in SI units are to be regarded as the standard.

1.3 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.

1.4 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.