1.1 本试验方法测量了在连续、组合对流和辐射热暴露下，通过阻燃材料的非稳态传热。 1.1.1 本试验方法不适用于不耐火的材料。 注1: 应在测试之前确定材料的阻燃性，并根据材料最终用途的适用性能或规范标准或两者进行测定。 1.1.2 本试验方法不能从规定的热能暴露中预测材料的皮肤烧伤性能。它不考虑暴露停止后试样中包含的热能。 注2: 看见 附录X4 有关本试验方法和预测皮肤烧伤的更多信息。 1.2 本试验方法用于测量和描述材料、产品或组件在受控条件下对热的响应，但其本身并不包括在实际火灾条件下对材料、产品或组件进行火灾危险或火灾风险评估所需的所有因素。 1.3 以国际单位制表示的数值应视为标准值。括号中给出的数值是英寸-磅或其他常用于热测试的单位的数学转换。 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 本试验方法旨在测定材料、材料组合的传热性能值，或比较火焰中使用的不同材料- 接触对流和辐射热危害的工人的防护服。 5.2 本试验方法评估了材料暴露于连续恒定热源时的非稳态传热性能。由于强制对流热损失，样品表面和热量计周围的空气运动可能会影响测量的传热。尽量减少样本和测试仪器周围的空气流动将有助于结果的重复性。 5.3 本试验方法将试样保持在静态水平位置，不涉及移动，但暴露引起的移动除外。 5.4 本试验方法规定了84±2 kW/m的标准功率 2. （2±0.05卡/厘米 2. s） 暴露条件。不同的暴露条件有可能产生不同的结果。允许使用代表预期危险的其他暴露条件，但应报告结果以及暴露能级稳定性的确定。 5.5 本试验方法不能预测热暴露引起的皮肤烧伤。 注4: 看见 附录X4 有关本试验方法和预测皮肤烧伤的更多信息。

1.1 This test method measures the non-steady state heat transfer through flame-resistant materials for clothing subjected to a continuous, combined convective and radiant heat exposure. 1.1.1 This test method is not applicable to materials that are not flame resistant. Note 1: The determination of a material’s flame resistance shall be made prior to testing and done according to the applicable performance or specification standard, or both, for the material’s end-use. 1.1.2 This test method does not predict a material’s skin burn injury performance from the specified thermal energy exposure. It does not account for the thermal energy contained in the test specimen after the exposure has ceased. Note 2: See Appendix X4 for additional information regarding this test method and predicted skin burn injury. 1.2 This test method is used to measure and describe the response of materials, products, or assemblies to heat under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound or other units that are commonly used for thermal testing. 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 This test method is intended for the determination of the heat transfer performance value of a material, a combination of materials, or a comparison of different materials used in flame-resistant clothing for workers exposed to combined convective and radiant thermal hazards. 5.2 This test method evaluates a material’s unsteady-state heat transfer properties when exposed to a continuous and constant heat source. Air movement at the face of the specimen and around the calorimeter can affect the measured heat transferred due to forced convective heat losses. Minimizing air movement around the specimen and test apparatus will aid in the repeatability of the results. 5.3 This test method maintains the specimen in a static, horizontal position and does not involve movement except that resulting from the exposure. 5.4 This test method specifies a standardized 84 ± 2 kW/m 2 (2 ± 0.05 cal/cm 2 s) exposure condition. Different exposure conditions have the potential to produce different results. Use of other exposure conditions that are representative of the expected hazard are allowed but shall be reported with the results along with a determination of the exposure energy level stability. 5.5 This test method does not predict skin burn injury from the heat exposure. Note 4: See Appendix X4 for additional information regarding this test method and predicted skin burn injury.