1.1 本规程介绍了用于报告耐火材料特性的单位，如密度、压碎应力、断裂模量、拉伸应力、导热性和渗透性。 1.2 为方便起见，还包括英寸-磅单位和国际单位之间的换算系数表。 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 本规程旨在通过建立统一的数据表示，促进耐火材料物理和机械性能的比较。 3.2 在可能的情况下，已选择单位，以产生耐火材料行业中常见的数量级，即g/cm 3. 而不是SI首选单位kg/m 3. 。建议选择SI前缀与单位一起使用，以使生成的数值介于0.1和1000之间。对于大多数属性，首选前缀千（k）和兆（M）。下表给出了其他前缀: 乘法 因素 前缀 象征 10 9 千兆 G 10 6. 百万 M 10 3. 公斤 k 10 2. 公顷 A. 小时 10 1. 德卡牌手表 A. 数据助理 10 −1. 十进制 A. d 10 −2. 摄氏度 A. c 10 −3. 百万 米 10 −6. 微型的 μ 10 −9 纳米技术 n （A） 在可行的情况下应避免。 3.3 根据耐火材料行业的一般用途选择的换算系数取自实践 E380型 ，如果可能。为了统一起见，它们已精确到小数点后四位。在使用中，转换后的值应四舍五入为与原始值相同的有效数字。

1.1 This practice presents the units to be employed for reporting the properties of refractories, such as density, crushing stress, modulus of rupture, tensile stress, thermal conductivity, and permeability. 1.2 For convenience, a table of conversion factors between inch-pound units and SI units is included. 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 This practice is provided to facilitate comparison of physical and mechanical properties of refractory materials by establishing uniform presentation of data. 3.2 Units have been chosen, where possible, to result in numbers of magnitude familiar in the refractories industry, that is, g/cm 3 rather than the SI preferred unit kg/m 3 . It is recommended that SI prefixes be selected for use with the units such that the resulting numerical values lie between 0.1 and 1000. For most properties, the prefixes kilo (k) and mega (M) are preferred. Other prefixes are given in the following table: Multiplication Factor Prefix Symbol 10 9 giga G 10 6 mega M 10 3 kilo k 10 2 hecto A h 10 1 deka A da 10 −1 deci A d 10 −2 centi A c 10 −3 milli m 10 −6 micro μ 10 −9 nano n (A) To be avoided where practical. 3.3 The conversion factors, which have been selected for their general utility in the refractories industry, have been taken from Practice E380 , where possible. For uniformity, they have been presented to four decimal places. In use, the converted values should be rounded to the same number of significant figures as in the original value.