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French NF P 92 503-507 (M1)

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Principle

NF P 92 – 503 (Electrical burner test) The flame of an electric burner is applied to a test sample. This results to a classification of M1 to M4.

NF P 92 – 504 (Rate of flame spread test, complementary to the electric burner) This method is applied to fabrics that show an unusual behavior during the electrical burner test.  After flame, non-propagation of the flame and burning or not-burning droplets are observed.

NFP 92-505 (Dripping test, also complementary to the electrical burner) The behavior of possible droplets produced by applying a radiator to a specimen of the fabric to be tested is recorded.  

Test Method

NF P 92 – 503 (Electrical burner test) 

A specimen is placed in a specimen holder at 30° above a radiator which gives out heat. 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

NF P 92 – 504 (Rate of flame spread test, complementary to the electric burner) 

A flame is held against a vertically positioned sample. The after flame time is recorded. The flame spread is calculated by determining the time for the flame to spread between two reference marks. The production of burning droplets is also noted.

NFP 92-505 (Dripping test, also complementary to the electrical burner) 

A sample is placed on a grid under the radiator. A cotton wool pad is placed below it to collect possible droplets. Heat is applied from the radiator. Ignition of the wool pad is recorded. 

Result

The test material is classified M1 to 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
 

Testing Lab

I.F.T.H. - Institut Français Textiles Habillement
Laboratoire Feu
Avenue Guy de Collongue
F-69134 Ecully Cedex
France

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