标准摘要
[中文适用范围]： 本国际标准规定了用于评估橡胶工业中研磨成干粉的天然碳酸钙（白垩或石灰石）的方法。 注 1：根据细度和化学纯度以及橡胶工业中使用的典型物理和化学特性对天然碳酸钙进行分类，参见资料性附录 D。 注 2：本国际标准不包括通过溶液沉淀制备的碳酸钙。 2 本国际标准列出了两套分析方法。 在正文中（4.8.2至4.8.4），给出了传统的分光光度测定方法；这些都是过时的、耗时的并且使用氯化溶剂。 建议逐步淘汰这些方法，并用附录 A、B 和 C 中列出的原子吸收方法代替。 [外文原描述]： 1.1 This International Standard specifies the methods to be used for the evaluation of natural calcium carbonate (chalk or limestone) ground to a dry powder for use in the rubber industry. NOTE 1 Classification of natural calcium carbonate according to fineness and chemical purity and typical physical and chemical properties for use in the rubber industry are given in informative annex D. NOTE 2 This International Standard does not cover calcium carbonates prepared by precipitation from solution. 1.2 There are two sets of analytical methods listed in this International Standard. In the body of the text (4.8.2 to 4.8.4), the traditional spectrophotometric methods are given; these are obsolescent, time-consuming and use a chlorinated solvent. It is recommended that these methods be phased out and replaced by the atomic absorption methods listed in annexes A, B and C.
英文名称Rubber compounding ingredients — Natural calcium carbonate — Test methods