NFX10-702/NF X 10-702: Smoke density

1. Standard -- NFX10-702/NF X 10-702
NF X 10-702: Fire test methods-Smoke emission-Test of measurement of specific optical density of smoke by the combustion or the pyrolysis of solid materials. 

The smoke density measurement taken from a material under fire conditions gives an indication of the visibility through the smoke, this is important as reduced visibility makes it more difficult to escape from a fire hence increasing the threat to human life from the toxic gases, flames and heat.

one specimen is tested in the flaming mode (25kW/m2 radiant heat with a pilot flame) and one specimen is tested in the non-flaming mode (25kW/m2 radiant heat without a pilot flame). 

Two values are determined from the test results: 
    ‘Ds max’ –Maximum smoke density measured during the test  
    ‘VOS4’ – A measure of the rate at which the smoke developed during the tested

2. NFX10-702/NF X 10-702 for assessing F classification (smoke density and toxicity)

According to NF X 70-100 and NF X 10-702 results of two tests to assess the toxicity of F-class level of F0-F5 smoke six levels (F0, F1, F2, F3, F4, F5)

F0 Class, Value of S.I.≤5; F1 Class, Value of S.I.≤20; F2 Class, Value of S.I.≤40; F3 Class, Value of S.I.≤80; F4 Class, Value of S.I.≤120; F5 Class, Value of S.I.＞120.

3．NFX10-702/NF X 10-702 test methods

NF X 10-702: Fire test methods-Smoke emission-Test of measurement of specific optical density of smoke by the combustion or the pyrolysis of solid materials. 

NF X 70-100: Fire behaviour tests –Analysis of pyrolysis and combustion gases-Pipe still method. 
NF F 16-101: Railway rolling stock fire behaviour choice of materials
NF F 16-102: Railway rolling stock fire behaviour choice of materials-Electrical Equipment 

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