Flame Spread ISO 56582 Lateral Flame Spread Apparatus
Flame spread of structural products including floorings and insullation materials is determined according to ISO 56582.
The requirements specified in EN 45545 2 depend on the end use of the product and the Hazard Level of the carriage.
The Lateral Flame Spread Apparatus measures the lateral spread of flame on vertically oriented specimens using a
rectangular radiant panel and an additional gas burner flame as the ignition source.
It provides data suitable for comparing the performance of essentially flat materials, composites or assemblies, which are primarily used as the exposed surfaces of walls.
Following ignition, any flame front which develops is noted, and the progression
of the flame front horizontally along the length of the specimen in terms of the time it takes to travel various distances is recorded.
The results are expressed in terms of the flame spread distance / time history, the flame front velocity versus heat flux, the critical heat flux at extinguishment and the average heat for sustained burning.
Table 3: Requirements concerning Flame Spread for ISO 56582 test Requirement set Test parameter and unit
R1, R7
R2, R3, R17 R4
R11 R12
Figure 6: FTT ISO 56582 Lateral Flame Spread Apparatus ISO 56582 / Critical Heat Flux at Extinguishment [kW/m2 ]
HL1 20* 13* 13* 30* 40*
Minimum threshold HL2 20* 13* 13* 30* 40*
HL3 20* 13* 13* 30* 40*
* If droplets/particles that exhibit sustained flaming are reported during the test ISO 56582, or for the special case of materials which do not ignite in ISO 56582 and are additionally reported as unclassifiable, the following requirements shall be added: Test to the requirements of EN ISO 119252 with 30 s flame application. The acceptance requirements are: – flame spread < 150 mm within 60 s; – no burning droplets/particles.
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EN 45545-2:2013 – NEW F I R E C LASSIFICATIONS AND FIRE TES T METHODS FOR THE EUROPEAN RAILWAY INDUSTRY
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