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NF P 92-501: M classification combustion test
1. Standard –NF P 92-501
NF P 92-501: Building materials- Reaction to fire tests, radiation test used for rigid material or flexible materials thickness more than 5mm.
2. Test method—NF P 92-501
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 (NF P 92-504 or NF P 92-505) may be required.
3. MClassification: M0-M4 (M0、M1、M1、M2、M3、M4)
All rigid materials or flexible materials thickness more than 5mm.
|
Radiation heat test |
Flame spread rate |
The highest heat value (the total combustion heat value) |
|||
|
class |
＜2mm/s |
＞2 mm/s |
＜2.5MJ/KG |
＞2.5MJ/KG |
|
|
No combustion |
M0 |
|
|
M0 |
M1 |
|
q＜2.5 |
M1 |
|
|
|
|
|
q＜15 |
M2 |
|
|
|
|
|
q＜50 |
M3 |
|
|
|
|
|
q≥50 |
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|
|
|
|
|
|
|
M4 |
NC |
|
|
4. 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
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