本第二版ULC标准已于2016年4月生效。该标准没有任何技术变更。本试验方法通过使用所述试验装置、试样配置和程序测量暴露于辐射热下试样的热释放和烟雾产生，确定用于评估建筑材料燃烧程度的燃烧性参数。本试验方法确定可能导致火灾的热量和烟雾量，火灾涉及由与试样相同的材料制成的产品。 本试验方法规定了试样的辐射热暴露。外部点火源由电火花提供。本试验方法基于以下观察结果:一般而言，材料的净燃烧热与其燃烧所需的氧气量直接相关。这种关系是这样的，即每消耗1.0千克氧气释放大约13.1 x 10^3 kJ的热量。热释放从试样受到锥形加热器辐射热暴露的那一刻开始测量。主要测量值为氧气浓度、光线遮蔽和排气流量。 还规定了质量损失率和持续燃烧时间的测量。通过燃烧产物流中光线的遮挡来测量烟雾的发展。本试验方法用于在50 kW/m2的外部热流暴露下，评估水平方向上的试样。样品一旦点燃，也会被自己的火焰加热。

This Second Edition ULC Standard has been reaffirmed effective April 2016. There have been no technical changes made to the Standard.This test method determines combustibility parameters for the assessment of degree of combustibility of building materials by measuring the heat release and smoke production from specimens exposed to radiant heat using the test apparatus, specimen configurations and procedures described.This test method determines the amount of heat and smoke that may be contributed to a fire involving products made from the same material as that of the test specimen.This test method provides for radiant thermal exposure of a specimen. An external source of ignition is provided by an electric spark.This test method is based on the observation that generally, the net heat of combustion of a material is directly related to the quantity of oxygen required for its combustion. This relationship is such that approximately 13.1 x 10^3 kJ of heat are released per 1.0 kg of oxygen consumed.Heat release is measured from the moment the specimen is subjected to the radiant thermal exposure of a conical heater.The primary measurements are oxygen concentration, light obscuration and exhaust flow rate. Provision is also made for measurement of mass-loss rate and time to sustained flaming.Smoke development is measured by obscuration of light in the combustion product stream.This test method is used to evaluate specimens in a horizontal orientation under an external heating flux exposure of 50 kW/m2. The specimen, once ignited, is also heated by its own flame.