1.1 本规范涵盖了从初级和次级含锡材料中回收和铸造的生铁形式的精炼锡。规定了锡金属的一个等级，并由中所示的等级字母指定 表1 . 1.2 将所含锡的百分比值视为标准。 1.3 以英寸-磅单位表示的值应被视为标准值。括号中给出的值是对SI单位的数学转换，仅供参考，不被视为标准。 1.4 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任熟悉所有危害，包括制造商提供的本产品/材料的适当材料安全数据表（MSDS）中确定的危害，建立适当的安全、健康和环境实践，并在使用前确定法规限制的适用性。1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 11.1 为确定是否符合所列物业的规定限度 表1 、观测值或计算值应按照四舍五入实践方法指示四舍五入 E29 .

1.1 This specification covers refined tin in pig form recovered and cast from primary and secondary tin-bearing materials. One grade of tin metal is specified and is designated by the grade letter shown in Table 1 . 1.2 The percent values of tin contained are to be regarded as the standard. 1.3 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. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use. 1.5 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 ====== 11.1 For the purpose of determining compliance with the specified limits for requirements of the properties listed in Table 1 , an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29 .