1.1 本试验方法描述了通过90μm（170目）或更大颗粒的Ro tap筛试验方法测定回收硫化颗粒橡胶平均粒径分布的程序。 1.2 以国际单位制表示的数值应视为标准。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 硫化颗粒橡胶的粒径分布用于指定产品网格或平均粒径。 4.2 反渗透丝锥法的网目尺寸产品名称基于尺寸名称屏幕，该屏幕允许保留最大5的上限范围 % 对于高达850μm（20目）的颗粒，最大10 % 850至150μm（20至100目），最大15 % 125至20μm（120至635目）。零筛上不得残留橡胶颗粒（见表2，分类 D5603 ). 4.3 记录保留在特定屏幕上的重量百分比。

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. ====== Significance And Use ====== 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.