1.1 这是火灾测试响应标准。本试验方法涵盖了一个小型实验室筛选程序，用于比较刚性热固性泡沫塑料的相对燃烧程度和时间以及质量损失。本试验方法仅用于确定相对燃烧特性。 1.1.1 本试验方法不适用于在试验条件下滴落或熔化的材料。 1.2 在燃烧过程中，会产生对人员有潜在危险的气体或蒸汽，或两者兼而有之。应采取足够的预防措施保护操作员。 1.3 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。 具体预防说明见 1.2 . 1.4 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。 1.5 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。 注1: 没有已知的ISO等效于本标准。 1.6 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 根据本试验方法描述的条件对硬质多孔材料进行的试验在比较其燃烧特性方面具有相当大的价值。 5.2 该试验方法已应用于柔性多孔材料和其他塑料，但尚未进行详细研究以确定其对这些材料的普遍适用性。 5.3 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，则通过本试验或从本试验中预测测得的耐火试验响应特性的变化并不总是可能的。因此，结果仅适用于本程序中描述的火灾试验暴露条件。

1.1 This is a fire-test-response standard. This test method covers a small-scale laboratory screening procedure for comparing relative extent and time of burning and loss of mass of rigid thermoset cellular plastics. This test method is to be used solely to establish relative burning characteristics. 1.1.1 This test method shall not be used for materials that drip or melt under the test conditions. 1.2 During the course of combustion, gases or vapors, or both, are evolved which are potentially hazardous to personnel. Adequate precautions shall be taken to protect the operator. 1.3 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. A specific precautionary statement is given in 1.2 . 1.4 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 materials, products, or assemblies under actual fire conditions. 1.5 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests. Note 1: There is no known ISO equivalent to this standard. 1.6 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 Tests made on rigid cellular materials in accordance with the conditions described by this test method can be of considerable value in comparing their burning characteristics. 5.2 This test method has been applied to flexible cellular materials and other plastics, but no detailed studies have been conducted to determine its general applicability to these materials. 5.3 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 to predict changes in the fire-test-response characteristics measured. The results are therefore valid only for the fire-test-exposure conditions described in this procedure.