1.1 本规范涵盖了一级浓缩天然橡胶胶乳的要求（见 表1 )属于以下类别: 类别1 -离心式 海维雅 仅用氨稳定的天然胶乳。 类别2 -奶油状 海维雅 仅用氨稳定的天然胶乳。 类别3 -离心式 海维雅 用低氨稳定的天然胶乳。 类别4 -离心或离心和奶油化的番石榴胶乳或其他天然橡胶胶乳，每克胶乳干重含有少于200µg总蛋白质，含氨或其他氢氧化物。 类别5 -用氢氧化铝或其他方法处理的离心橡胶天然胶乳，用氨稳定，非橡胶含量仅低于0.5%。 1.2 本规范不一定适用于通过其他方法制备、稳定或保存的胶乳，也不应被解释为限制其他类别胶乳的可取性或有用性。 它确实适用于除 巴西橡胶树 但不适用于复合胶乳浓缩物。 1.3 适用于规范的分析程序包括在内，并按以下顺序出现: 部分 取样 6和 7. 固体总量 8– 17 干橡胶含量 18 蛋白质含量 19 总碱度 20 粘度 21 污泥含量 22 凝结物含量 23 KOH编号 24 pH值 25 机械稳定性 26 铜和锰 27 密集 28– 40 挥发性脂肪酸 41– 45 硼酸 46 干膜 47 所有测试方法的精度 48 1.4 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 4.1 本规范规定了范围中定义的5类乳胶的限制，并规定了用于指定性能的试验方法。这些测试方法可用于生产控制或裁判目的。

1.1 This specification covers requirements for first grade concentrated natural rubber latex (see Table 1 ) of the following categories: Category 1 —Centrifuged Hevea natural latex stabilized with ammonia only. Category 2 —Creamed Hevea natural latex stabilized with ammonia only. Category 3 —Centrifuged Hevea natural latex stabilized with low ammonia. Category 4 —Centrifuged, or centrifuged and creamed, guayule latex, or other natural rubber latex, containing less than 200 µg total protein per gram dry weight of latex, with ammonia or other hydroxide. Category 5 —Centrifuged Hevea natural latex treated with aluminum hydroxide or by other means, stabilized with ammonia only containing less than 0.5 % non-rubber content. 1.2 This specification is not necessarily applicable to latices prepared, stabilized, or preserved by other methods, and shall not be construed as limiting the desirability or usefulness of other categories of latices. It does apply to natural latex sources other than Hevea brasiliensis but does not apply to compounded latex concentrates. 1.3 The analytical procedures applicable to the specifications are included and appear in the following order: Section Sampling 6 and 7 Total Solids 8 – 17 Dry Rubber Content 18 Protein Content 19 Total Alkalinity 20 Viscosity 21 Sludge Content 22 Coagulum Content 23 KOH Number 24 pH 25 Mechanical Stability 26 Copper and Manganese 27 Density 28 – 40 Volatile Fatty Acids 41 – 45 Boric Acid 46 Dry Films 47 Precision for All Test Methods 48 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 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 This specification denotes limits on the 5 categories of latex as defined in the scope and defines the test methods to use for the specified properties. These test methods may be used for production control or for referee purposes.