1.1本规范涵盖从主要和次要含锡材料中回收和铸造的清管器形式的精炼锡。规定了锡金属的一个等级，并由表1所示的等级字母指定。 1.2所含锡的百分比值应视为标准。 1.3以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任熟悉所有危险，包括制造商提供的本产品/材料的适当材料安全数据表（MSDS）中确定的危险，建立适当的安全和健康实践，并在使用前确定监管限制的适用性。 ====意义和用途====== 为了确定是否符合表1所列特性要求的规定限值，应按照实践中的舍入方法对观察值或计算值进行舍入 E29年 .

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 and health practices, and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 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 .