1.1 本火灾试验响应标准描述了在试验室内分级辐射热能环境中，暴露在燃烧点火源下的阁楼地板隔热材料的临界辐射通量的测量程序。样本是阁楼地板的任何隔热材料。本试验方法不适用于暴露于辐射热能环境或引燃器时熔化或收缩的绝缘材料。 1.2 该火灾测试响应标准测量火焰前进最远点的临界辐射通量。它为估计暴露阁楼地板隔热的火灾暴露行为的一个方面提供了基础。所施加的辐射通量模拟了可能入射到阁楼地板上的热辐射水平，阁楼的上表面被穿过屋顶的太阳或阁楼中偶然发生的火灾产生的火焰加热。 本火灾测试响应标准旨在模拟阁楼火灾中的一个重要火灾暴露成分，但不用于估计阁楼地板以外安装的隔热材料的火焰传播行为。 1.3 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.4 本标准的文本引用了提供解释性信息的注释和脚注。除表和图中的注释和脚注外，这些注释和脚注不应被视为本标准的要求。 1.5 本标准用于测量和描述材料、产品或组件在受控条件下对热量和火焰的响应，但其本身并未包含在实际火灾条件下对材料、产品和组件进行火灾危险或火灾风险评估所需的所有因素。 1.6 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。 1.7 本标准的文本引用了提供解释性材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应被视为本标准的要求。 1.8 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====== 5.1 本火灾测试响应标准旨在为评估安装在建筑阁楼地板上的暴露绝缘材料的火灾暴露行为的一个方面提供依据。测试环境旨在模拟在全尺寸阁楼实验中观察和定义的条件。 5.2 该测试旨在适用于法规、规范验收、设计目的或开发和研究。 5.3 测试中固有的基本假设是，临界辐射通量是衡量地板或阁楼托梁之间暴露绝缘材料表面燃烧特性的一个指标。 5.4 该测试适用于遵循或模拟公认安装实践的阁楼地板绝缘试样。 5.5 在该程序中，试样应接受一组或多组特定的实验室火灾试验暴露条件。 如果替换了不同的试验条件或改变了预期的最终使用条件，则应谨慎预测通过本试验或通过本试验测量的性能特性的变化。因此，该结果仅对本程序中描述的火灾试验暴露条件严格有效。 5.5.1 如果在对建筑结构火灾危险性进行全面评估时要考虑通过该测试方法获得的测试结果，则必须将E-5委员会制定的所有相关火灾危险性评估既定标准纳入考虑范围。

1.1 This fire-test-response standard describes a procedure for measuring the critical radiant flux of exposed attic floor insulation subjected to a flaming ignition source in a graded radiant heat energy environment in a test chamber. The specimen is any attic floor insulation. This test method is not applicable to those insulations that melt or shrink away when exposed to the radiant heat energy environment or the pilot burner. 1.2 This fire-test-response standard measures the critical radiant flux at the point at which the flame advances the farthest. It provides a basis for estimating one aspect of fire exposure behavior for exposed attic floor insulation. The imposed radiant flux simulates the thermal radiation levels likely to impinge on the floors of attics whose upper surfaces are heated by the sun through the roof or by flames from an incidental fire in the attic. This fire-test-response standard was developed to simulate an important fire exposure component of fires that develop in attics, but is not intended for use in estimating flame spread behavior of insulation installed other than on the attic floor. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.4 The text of this standard references notes and footnotes that provide explanatory information. These notes and footnotes, excluding those in tables and figures, shall not be considered as requirements of this standard. 1.5 This standard is used to measure and describe the response of materials, products, or assemblies to heat and flame 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. 1.6 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. 1.7 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.8 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 fire-test-response standard is designed to provide a basis for estimating one aspect of the fire exposure behavior to exposed insulation installed on the floors of building attics. The test environment is intended to simulate conditions that have been observed and defined in full-scale attic experiments. 5.2 The test is intended to be suitable for regulatory statutes, specification acceptance, design purposes, or development and research. 5.3 The fundamental assumption inherent in the test is that critical radiant flux is one measure of the surface burning characteristics of exposed insulation on floors or between joists of attics. 5.4 The test is applicable to attic floor insulation specimens that follow or simulate accepted installation practice. 5.5 In this procedure, the specimens are subjected to one or more specific sets of laboratory fire test exposure conditions. If different test conditions are substituted or the anticipated end-use conditions are changed, caution should be used to predict changes in the performance characteristics measured by or from this test. Therefore, the results are strictly valid only for the fire test exposure conditions described in this procedure. 5.5.1 If the test results obtained by this test method are to be considered in the total assessment of fire hazard in a building structure, then all pertinent established criteria for fire hazard assessment developed by Committee E-5 must be included in the consideration.