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. 

M Classification: M0-M4 (M0、M1、M1、M2、M3、M4)

Other Standard:

NF P 92-501: Building materials- Reaction to fire tests, radiation test used for rigid material or flexible materials thickness more than 5mm.

NF P 92-503: Electrical burner test used for flexible materials thickness no more than 5mm

NF P 92-504: speed of spread of flame test used for the materials which are not intended to be glued on a rigid substrate

NF P 92-505: Dripping test with electrical radiator, used for melting materials