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The "reaction to fire" tests classify the material in 5 categories from M0 to M4. The specific standard that is applicable depends on the intended use (see table below). Class M0 is assigned if the requirements for class M1 are met and the heat of combustion (upper calorific potential test by NF P 92-510) does not exceed 2500 kJ/kg (typical M0 material are concrete, blaster, mineral based product). To determine the classifications M1 to M4 and NC, series of test is conducted. 

Table 1: building material fire classification and test methods for all materials excepted lining material

ClassTest
MO
Non-flammable (Calorific value < or = to 2508 kJ/kg)
NF P 92 510 Determination of upper calorific potential
NF P 92 501 Radiation test used for rigid materials, or for material on rigid substrates (finishes) of all thicknesses, and for flexible materials thicker than 5 mm
NF P 92 503 Electrical burner test used for flexible materials 5 mm thick or less
M1
Non-flammable (Calorific value > or = to 2508 kJ/kg)
NF P 92 510 Determination of upper calorific potential
NF P 92 501 Radiation test used for rigid materials, or for material on rigid substrates (finishes) of all thicknesses, and for flexible materials thicker than 5 mm
NF P 92 503 Electrical burner test used for flexible materials 5 mm thick or less

Complementary tests
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 material
M2
Low flammability
NF P 92 501 Radiation test used for rigid materials, or for material on rigid substrates (finishes) of all thicknesses, and for flexible materials thicker than 5 mm
NF P 92 503 Electrical burner test used for flexible materials 5 mm thick or less

Complementary tests
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 material
M3
Moderately flammable
M4
High flammability


Notes: The NF P 92 504 and 505 tests are used when some unusual phenomenon's (fall of burning droplets for example) are observed. 


Table 2: building material fire classification and test methods for lining materials

ClassTest
MO
Non-flammable (Calorific value < or = to 2508 kJ/kg)
NF P 92 510 Determination of upper calorific potential
NF P 92 501 Radiation test used for rigid materials, or for material on rigid substrates (finishes) of all thicknesses, and for flexible materials thicker than 5 mm
M1
Non-flammable (Calorific value > or = to 2508 kJ/kg)
NF P 92 510 Determination of upper calorific potential
NF P 92 501 Radiation test used for rigid materials, or for material on rigid substrates (finishes) of all thicknesses, and for flexible materials thicker than 5 mm
Complementary tests
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 material
M2
Low flammability
M3
Moderately flammable
NF P 92 506 Radiant panel test for flooring
M4
High flammability


The current requirements are M0/M1 for ceiling, M2 for Wall cladding and M3/M4 for flooring. 

Subpages (1): NF 92501