A test rig is constructed, and exposed to a burning cigarette covered with sheeting material. The cigarette has to burn its entire length.
The test material is categorised Class I or Class II. If an obvious ignition occurs, the material is Class II. If not, the char on the vertical panel is measured to determine the classification.
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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.