1.1 本规程涵盖了根据粘弹性差异预测的加工性能，在工厂对TSR10或TSR20天然橡胶包进行分类。 1.2 本规程确定了哪些捆应用于工厂化合物中，哪些捆有益于使用“软”天然橡胶，而哪些捆更适用于“硬”天然橡胶。 1.3 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====== 3.1 符合规范要求 D2227 ，TSR10和TSR20的装运必须满足30的最低初始华莱士塑性（Po）才能被接受。 然而，即使有这个最小限制，未固化的粘弹性或“加工性”特性也允许有很大的变化。这种特性的变化会显著影响工厂操作的质量和效率。 3.2 TSR10或TSR20包的未固化弹性质量较低（“软”橡胶），在某些情况下可能会使轮胎内衬、缓冲胶和侧壁具有更好的加工性能。“软”捆有时具有更好的成型粘性、更好的模具流动性和更低的挤出胀大以及更好的尺寸稳定性。此外，这些“软”橡胶包在溶剂中的溶解速度可能更快，以便进行粘附浸渍。 3.3 在某些情况下，未固化弹性质量较高的TSR10或TSR20包（“硬”橡胶）在工厂混合的初始阶段会产生更大的剪切，从而导致更快的分解和更短的混合周期。 3.4 因此，在工厂运营中，有时将TSR10或TSR20货物分为“软”和“硬”类别可以提高工厂运营的效率和质量。

1.1 This practice covers the sorting of natural rubber bales of TSR10 or TSR20 in the factory according to their predicted processing performance based on differences in viscoelastic properties. 1.2 This practice determines which bales should be used in factory compounds which benefit from using “soft” natural rubber versus which work better with “hard” natural rubber. 1.3 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 ====== 3.1 In accordance with Specification D2227 , shipments of TSR10 and TSR20 must meet a minimum initial Wallace plasticity (Po) of 30 to be accepted. However, even with this minimum restriction, the uncured viscoelastic or “processability” properties are allowed to vary greatly. This variation in properties can significantly affect the quality and efficiency of a factory operation. 3.2 Bales of TSR10 or TSR20 which are lower in their uncured elastic quality (“soft” rubber) in some cases may impart better processing properties to tire innerliners, cushion gums, and sidewalls. “Soft” bales sometimes impart better building tack, better mold flow, and lower extrusion die swell with better dimensional stability. Also, these “soft” rubber bales may dissolve faster in solvents for adhesion dipping. 3.3 Bales of TSR10 or TSR20 that are higher in their uncured elastic quality (“hard” rubber) in some cases generate greater shearing during the initial stages of a factory mix, which result in a faster breakdown and a shorter mix cycle. 3.4 Therefore, in a factory operation, sometimes segregating TSR10 or TSR20 shipments into “soft” and “hard” categories can improve the efficiency and quality of a factory operation.