1.1 这一分类包括耐火粘土和高铝塑性耐火材料以及可捣实或捣实到位以形成整体结构的捣实混合物。术语“塑料”和“捣实混合物”通常用于描述材料的和易性。在这方面，塑料被认为是工作性指数超过15的材料 % 按照试验方法 181元 ，而夯实混合料通常少于15 % 同一程序的可加工性。 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====== 3.1 该分类定义了一组类别，供生产或采购耐火粘土和高铝塑料耐火材料及捣打混合料的人员使用。每种类别都受到PCE或氧化铝含量的限制，或两者兼而有之。当 表1 是唯一指定的项。 （A） NR=不需要。

1.1 This classification covers fireclay and high-alumina plastic refractories and ramming mixes that can be pounded or rammed into place to form a monolithic structure. The terms “plastic” and “ramming mix” are generally intended to describe the workability of the material. In this regard, plastics are considered to be materials having a workability index of more than 15 % in accordance with Test Method C181 , while ramming mixes generally have less than 15 % workability by the same procedure. 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 ====== 3.1 This classification defines a group of classes for use by those producing or purchasing fireclay and high-alumina plastic refractories and ramming mixes. Each class is limited by PCE or alumina content, or both. This classification is frequently used as a specification when the properties shown in Table 1 are the only items specified. (A) NR = not required.