1.1 该分类包括耐火砖和主要由锆石（ZrO）组成的形状 2. ·二氧化硅 2. )通过化学分析，含有不少于60 % 氧化锆（ZrO 2. )且不少于30 % 二氧化硅（SiO 2. ). 1.2 以英寸-磅单位表示的数值视为标准值。括号中给出的值是数学转换为SI单位，仅供参考，不被视为标准单位。 1.3 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 锆英石质耐火材料的锆英石含量和体积密度对其耐化学性及其在耐火材料中的满意应用有重要影响。这种分类被认为对采购规范和质量控制有用。

1.1 This classification covers fired refractory brick and shapes consisting predominantly of zircon (ZrO 2 ·SiO 2 ) and containing, by chemical analysis, not less than 60 % zirconium oxide (ZrO 2 ) and not less than 30 % silica (SiO 2 ). 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 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 The zircon content and bulk density of a zirconia-silica refractory material have important influences on chemical resistance and its satisfactory use in refractory applications. This classification is considered useful for purchase specifications and quality control.