1. NF P92-501 Fire test to Building materials M classification - Standard
NF P92-501: Building materials-Reaction to fire tests, radiation test used for rigid material or flexible materials thickness more than 5mm.

2. NF P92-501 Fire test to Building materials M classification - Test Method
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 （NF P92-507）
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 (NF P 92-504 or NF P 92-505) may be required. 

3. NF P92-501 Fire test to Building materials M classification - Similar Standard
NF P92-501: Building materials- Reaction to fire tests, radiation test used for rigid material or flexible materials thickness more than 5mm.
NF P92-503: Electrical burner test used for flexible materials thickness no more than 5mm
NF P92-504: speed of spread of flame test used for the materials which are not intended to be glued on a rigid substrate
NF P92-505: Dripping test with electrical radiator, used for melting materials
NF P92-506: Fire safety, Building materials, Reaction for fire tests, Radiant panel test for flooring
NF P92-507: Fire safety, Building materials, Construction and furnishing materials –Classification according to reaction to fire.

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