Specifies a test for examining the ignition characteristics of the exposed surfaces of specimens, composites or assemblies of building products, not exceeding 70 mm in thickness, when placed horizontally and subjected to specified levels of thermal irradiance.

 规定了一项测试，用于检查厚度不超过 70 毫米的建筑产品样本、复合材料或组件的暴露表面在水平放置并经受指定水平的热辐照度时的点燃特性。