The test specimen is mounted on a vertical support frame. A small denatured alcohol flame is used as an ignition source. Either the highest reach point of the flame during the test, or the time for the flame to reach a marked point is determined. The speed factor, spread factor, heat factor and flammability index are calculated.
Based on the flammability index, the material passes or fails the requirements.
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A specimen of the fabric for maritime use to be tested is oriented vertically. A flame is applied to it to determine the burning behaviour.