NF P 92-501: Building materials- Reaction to fire tests, radiation test used for rigid material or flexible materials thickness more than 5mm.
Specimens of the product are mounted in an enclosed chamber at an angle of 45° to the horizontal and exposed to thermal radiation (30kW/m²) on their lowest surface, the test duration 20 minutes.
The materials is classified M1 to M4 according to the q index
M1 - Non flammable q < 2.5
M2 - Low flammability q < 15
M3 - Moderately flammable q < 50
M4–flammable q≥50
If specific, unusual, specimen behaviour is observed additional supplementary tests may be required.
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