1.1 本试验方法包括测定规范中分类的用于隔热的柔性低渗透蒸汽缓凝剂的电阻 C1136 温度和湿度升高。在高温和高湿度下暴露后，使用水蒸汽渗透测量和目视检查来评估蒸汽缓凝剂的响应。 1.2 本试验方法中评估的典型蒸汽缓凝剂适用于室内使用，包括箔纸牛皮纸层压板、金属化聚酯牛皮纸层压板、处理过的织物、处理过的纸、薄膜、箔或这些材料的组合，这些材料包括蒸汽缓凝剂材料。本试验方法不适用于评估常用于绝缘产品的液体涂层、密封剂或胶粘剂。 1.3 以英寸表示的值- 磅单位应视为标准单位。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在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（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====== 5.1 在亚环境温度下运行的系统上，潮湿的环境条件会导致蒸汽驱动力流向绝缘层。如果不延迟，驱动的水汽对绝缘层的热阻有害。蒸汽缓凝剂必须能够抵抗降解，以保持其对蒸汽通道的阻力。本试验方法中的劣化是由高温和湿度条件引起的。

1.1 This test method covers the determination of the resistance of flexible low permeance vapor retarders for thermal insulation as classified in Specification C1136 to elevated temperature and humidity. Water vapor permeance measurement and visual inspection after exposure at elevated temperature and humidity are used to assess vapor retarder response. 1.2 Typical vapor retarders evaluated in this test method are intended for indoor use and include foil-scrim-kraft laminates, metallized polyester-scrim-kraft laminates, treated fabrics, treated papers, films, foils, or combinations of these materials that comprise a vapor retarder material. This test method is not intended for assessment of the liquid-applied coatings, sealants, or mastics commonly used with insulation products. 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 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 ====== 5.1 On systems operating at sub-ambient temperature, humid ambient conditions cause a vapor driving force toward the insulation. If not retarded, the driven moisture vapor is detrimental to the insulation's thermal resistance. A vapor retarder must resist degradation in order maintain its resistance to vapor passage. Degradation in this test method is induced by elevated temperature and humidity conditions.