1.1本分类涵盖了机制耐火粘土和高铝耐火砖，其目的是根据其正常和特性，列出这些材料的各种类别和类型，这在其使用中很重要。

1.1 This classification covers machine-made fireclay and high-alumina refractory brick, and its purpose is to set forth the various classes and types of these materials in accordance with their normal and characteristic properties, which are important in their use.