1.1 本试验方法涵盖了服装系统中使用的织物、薄膜、涂层、泡沫和皮革（包括多层组件）在稳态条件下的热阻、耐蒸发性和总热损失的测量。 1.2 该固有热阻测量技术的范围为0.002至0.5 K·m 2. /W，固有蒸发阻力为0.0至1.0 kPa·m 2. /W。总热损失范围为0.0至1300 W/m 2. 。 1.3 以国际单位制表示的数值应视为标准。本标准中提供了其他计量单位，但不视为标准。 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）。本标准的使用者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====== 4.1 织物、薄膜、涂层、泡沫和皮革（包括多层组件）提供的耐热性、耐蒸发性和总热损失对于确定其在制造防护服系统中的适用性具有相当重要的意义。 4.1.1 热阻、蒸发阻力和总热损失会受到环境条件的显著影响。当使用在标准测试条件下测量的结果来确定材料是否适合在测试条件之外的条件下使用时，必须格外小心。 4.2 人与环境之间的热交换是一个极其复杂的主题，除了织物、薄膜、涂层、泡沫和皮革（包括多层组件）的稳态电阻值外，还涉及许多因素。因此，在热板上测量的热阻值、蒸发阻力值和总热损失可以指示也可以不指示特定材料或系统对于给定服装应用的相对优点。虽然织物测试产生的测量结果可能是服装性能的指标，但尚未证明与人们所穿服装系统的性能相关。服装重量、悬垂性、贴合度等可以最大限度地减少甚至抵消通过该测试方法测量的织物或织物组件之间的明显差异。 4.3 衣物系统和物品的热阻和耐蒸发性可根据试验方法在环境室内用加热的出汗人体模型进行测量 F1291美元 ， F2370 和 第3426页 。

1.1 This test method covers the measurement of the thermal resistance, evaporative resistance, and total heat loss under steady-state conditions of fabrics, films, coatings, foams, and leathers, including multi-layer assemblies, for use in clothing systems. 1.2 The range of this measurement technique for intrinsic thermal resistance is from 0.002 to 0.5 K·m 2 /W and for intrinsic evaporative resistance is from 0.0 to 1.0 kPa·m 2 /W. The total heat loss range is from 0.0 to 1300 W/m 2 . 1.3 The values in SI units shall be regarded as standard. Other units of measurement are provided in this standard but are not regarded as 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 ====== 4.1 The thermal resistance, evaporative resistance, and total heat loss provided by fabrics, films, coatings, foams, and leathers, including multi-layer assemblies, is of considerable importance in determining their suitability for use in fabricating protective clothing systems. 4.1.1 The thermal resistance, evaporative resistance, and total heat loss can be significantly affected by environmental conditions. Extreme care must be taken when using results measured under standard testing conditions to determine a material’s suitability for use in conditions outside the testing conditions. 4.2 The thermal interchange between people and their environment is an extremely complicated subject that involves many factors in addition to the steady-state resistance values of fabrics, films, coatings, foams, and leathers, including multi-layer assemblies. Therefore, thermal resistance values, evaporative resistance values, and total heat loss measured on a hot plate may or may not indicate relative merit of a particular material or system for a given clothing application. While a possible indicator of clothing performance, measurements produced by the testing of fabrics have no proven correlation to the performance of clothing systems worn by people. Clothing weight, drape, tightness of fit, and so forth, can minimize or even neutralize the apparent differences between fabrics or fabric assemblies measured by this test method. 4.3 The thermal resistance and evaporative resistance of clothing systems and items can be measured with a heated sweating manikin in an environmental chamber in accordance with Test Methods F1291 , F2370 , and F3426 .