1.1 本耐火试验响应标准确定了与恒定均匀热流下垂直定向样品的引燃以及由于外部辐射热流在垂直表面上的横向火焰传播有关的材料特性。 1.2 该试验方法的结果提供了点火所需的最小表面通量和温度( q ˙ " o、 ig , T ig )横向扩展( q ˙ " o、 s , T s ，最小值 )，有效材料热惯性值( k ρ c )，以及与横向火焰传播相关的火焰加热参数（Φ）。 1.3 该试验方法的结果可能有助于预测点火时间， t ig ，和速度， 五、 ，在没有强制横向气流的情况下，在规定的外部通量下，火焰在垂直表面上横向传播。使用中的等式 附录X1 用于控制点火和火焰传播过程，并用于关联数据。 1.4 该试验方法可能有助于获得材料的点火和火焰传播结果。数据以单位报告，以便在当前的火灾增长模型中使用。 1.5 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.6 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。 1.7 防火测试本身就很危险。在进行这些测试时，应采取适当的人员和财产保护措施。 1.8 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。 有关具体的危险说明，请参阅第节 7. . 1.9 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 本试验方法涉及引燃和火焰传播的基本方面。该程序适用于推导相关材料易燃性参数，其中包括点火、热处理的最低暴露水平- 惯性值和火焰传播特性。 5.2 本试验方法用于测量一些科学恒定且相容的材料易燃性，并得出允许预测和解释材料火焰传播特性的特定特性。它们被视为有效特性，取决于所使用的相关性，当与理论结合时，可以在广泛的火灾条件下用于预测材料点火和火焰传播行为。 5.3 对于没有平面或接近平面外表面的产品以及物理性能（如接头分离和紧固方法）对实际火灾条件下的火焰传播有重大影响的产品和组件，请勿使用本试验方法。 5.4 在该程序中，样本经受一组或多组特定的实验室测试条件。如果替换了不同的试验条件或改变了最终使用条件，则通过本试验方法或从本试验方法中并不总是可能预测测得的耐火试验响应特性的变化。因此，结果仅对本程序中描述的火灾试验暴露条件有效（另请参见 1.6 ).

1.1 This fire test response standard determines material properties related to piloted ignition of a vertically oriented sample under a constant and uniform heat flux and to lateral flame spread on a vertical surface due to an externally applied radiant-heat flux. 1.2 The results of this test method provide a minimum surface flux and temperature necessary for ignition ( q ˙ " o,ig , T ig ) and for lateral spread ( q ˙ " o,s , T s ,min ), an effective material thermal inertia value ( k ρ c ), and a flame-heating parameter (Φ) pertinent to lateral flame spread. 1.3 The results of this test method are potentially useful to predict the time to ignition, t ig , and the velocity, V , of lateral flame spread on a vertical surface under a specified external flux without forced lateral airflow. Use the equations in Appendix X1 that govern the ignition and flame-spread processes and which have been used to correlate the data. 1.4 This test method is potentially useful to obtain results of ignition and flame spread for materials. Data are reported in units for convenient use in current fire growth models. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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. 1.7 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests. 1.8 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. For specific hazard statements, see Section 7 . 1.9 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 addresses the fundamental aspects of piloted ignition and flame spread. The procedure is suitable for the derivation of relevant material flammability parameters that include minimum exposure levels for ignition, thermal-inertia values, and flame-spread properties. 5.2 This test method is used to measure some material-flammability properties that are scientifically constant and compatible and to derive specific properties that allow the prediction and explanation of the flame-spread characteristics of materials. They are considered effective properties that are dependent on the correlations used and when combined with theory can be used over a wide range of fire conditions for predicting material ignition and flame-spread behavior. 5.3 Do not use this test method for products that do not have planar, or nearly planar, external surfaces and those products and assemblies in which physical performance such as joint separation and fastening methods has a significant influence on flame propagation in actual fire conditions. 5.4 In this procedure, the specimens are subjected to one or more specific sets of laboratory test conditions. If different test conditions are substituted or the end-use conditions are changed, it is not always possible by or from this test method to predict changes in the fire-test-response characteristics measured. Therefore, the results are valid only for the fire test exposure conditions described in this procedure (see also 1.6 ).