1.1 本规范涵盖了用作与土壤或混凝土板下颗粒填料接触的蒸汽缓凝剂的柔性预成型片状薄膜材料。 1.1.1 本规范不包括沥青蒸汽缓凝剂。参见规范 1993年/1993年 有关沥青蒸汽缓凝剂的信息。 1.2 对新材料和经过处理或暴露以模拟潜在使用条件的材料进行规定的试验。 1.3 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.4 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。

1.1 This specification covers flexible, preformed sheet membrane materials to be used as vapor retarders in contact with soil or granular fill under concrete slabs. 1.1.1 This specification does not cover bituminous vapor retarders. See Specification E1993/E1993M for information on bituminous vapor retarders. 1.2 The specified tests are conducted on new materials and materials that have been conditioned or exposed to simulate potential service conditions. 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 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.