This part of ISO 5660 specifies a method for assessing the heat release rate and dynamic smoke
production rate of specimens exposed in the horizontal orientation to controlled levels of irradiance
with an external igniter. The heat release rate is determined by measurement of the oxygen consumption
derived from the oxygen concentration and the flow rate in the combustion product stream. The time to
ignition (sustained flaming) is also measured in this test.
The dynamic smoke production rate is calculated from measurement of the attenuation of a laser light
beam by the combustion product stream. Smoke obscuration is recorded for the entire test, regardless
of whether the specimen is flaming or not.