| Clay content (%) | Duration of flammability (seconds) | Average length destroyed (mm) | Formation of tastes | Classification |
Non thermoformed | 0 | total combustion of the samples with flame | ≥350 | No | M3 |
5 | 65.93 | 25 | No | M2 | |
10 | 27.2 | 21.33 | No | ||
15 | 15.4 | 14 | No | ||
Thermoformed | 0 | total combustion of the samples with flame | 33 | No | M3 |
5 | 65.12 | 33 | No | M2 | |
10 | 21.57 | 19.66 | No | ||
15 | 11.03 | 18 | No |