ISO 5660-4:20 08规定了一种评估材料和产品的方法，这些材料和产品在暴露于完全发展的火灾中典型的高热通量（即辐照度水平）时产生低水平的热释放。它与ISO 5660-1的不同之处在于规定了特定样品尺寸、样品支架、样品方向、O2分析的体积流速和进行测试的辐照度水平等项目。 ISO 5660-4:20 08旨在用于仅含有少量可燃元素的产品和材料，例如总放热量<15 MJ·m-2的试样。 从ISO 5660-4:20 08中的测试方法获得的信息也可用于消防安全工程目的。

ISO 5660-4:2008 specifies a method for evaluating materials and products that produce low levels of heat release when exposed to high heat flux (i.e. irradiance levels) typical of fully developed fires. It differs from ISO 5660-1 by prescribing items such as specific specimen size, specimen holder, specimen orientation, volumetric flow rate for O₂ analyses and irradiance levels at which testing is conducted. ISO 5660-4:2008 is intended for use on products and materials that contain only small amounts of combustible elements, e.g. test specimens that yield a total heat release of < 15 MJ m^-2. The information obtained from the test method in ISO 5660-4:2008 can also be used for fire safety engineering purposes.