For each material or set of materials, a minimum of 3 samples (140 mm x 140 mm) will be tested.
Test: a fabric sample will be subjected to an incident heat flow of 80 kW/m² ± 5%. The heat that passes through the sample is measured using a calorimeter located above, and in contact with, the fabric sample.
The time in seconds needed for the calorimeter’s temperature to increase 24 ºC ± 0.2 ºC is measured.
When multilayered sets are tested, the fabrics should follow the order in which they will be made.
2 Calorimeter block