| NF F 16-101/NF P 92-503: M classification combustion test    
 1. Standard-- NF F 16-101/NF P 92-503 NF P 92-503: Electrical burner test used for flexible materials thickness no more than 5mm  2. Test method—NF F 16-101/NF P 92-503 A specimen in placed in a specimen holder at 30° above a radiator which gives out heat(30kW/m²). A small butane flame is applied directly to the fabric surface.  The following aspects are recorded:   - duration of the flame - production of burning droplets  - length/width of the damaged specimen If specific, unusual, specimen behaviour is observed additional supplementary tests NF P 92-504 & NF P 92-505) may be required.    3. M Classification: M0-M4(M0、M1、M2、M3、M4)   
 
| Method | Classes |  
| NF P 92 - 505 | - | No ignition of the wool | No ignition of the wool | Ignition of the wool | Ignition of the wool |  
| NF P 92 - 503 | No droplets | Not-burning droplets | Burning droplets | Not-burning droplets | Burning droplets |  
| Ignition time =< 5s | M1 | M1 | M2 | M4 | M4 |  
| Ignition time > 5s; damaged length < 350mm | M2 | M2 | M3 | M4 | M4 |  
| Ignition time > 5s; damaged length between 450mm and 600mm; damaged width < 90mm | M3 | M3 | M4 | M4 | M4 |  
| NF P 92 - 504 | - | - | M4 | M4 | M4 |  
 
   4.Other Standard of M classification   
 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.    5. NF P 92-503/ NF F 16-101requirement    NF P 92-503: Electrical burner test used for flexible materials thickness no more than 5mm. |