1.1 本规范涵盖了五级天然生胶的最低物理和化学质量要求或规范。 1.2 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 人造橡胶产品的一般最终使用质量取决于橡胶的物理和化学特性。

1.1 This specification covers minimum physical and chemical quality requirements or specifications for five grades of raw natural rubber. 1.2 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 general end-use quality of manufactured rubber products depends on the physical and chemical properties of the rubber.