Hear Irradiance Resistance Tester, to determine the reaction to thermal irradiance or fire, used for building rigid material or flexible materials thicker than 5mm.
The sample is 45 degree inclined to the horizontal plane in a closed chamber, and the thermal radiation of 30 kW / m2 is exposed with the lowest surface of sample. The samples are placed above and below the pilot flame, so can any release of volatile gas ignited. After ignition, the ignition flame is removed, samples of the flame can be extinguished.
NF P 92-501, TB/T 2639.1