Division 2.7.2.3 A flammable solid shall be classified in one of the two categories for this class using Method N.1 as described in 33.2.1 of the UN RTDG, Manual of Tests and Criteria in accordance with Table 2.7.1:F1

Burning rate test

Substances and mixtures other than metal powders:

1. (a)

   wetted zone does not stop fire and

2. (b)

   burning time < 45 seconds or burning rate > 2,2 mm/s

Metal powders

burning time ≤ 5 minutes

Burning rate test

Substances and mixtures other than metal powders:

1. (a)

   wetted zone stops the fire for at least 4 minutes and

2. (b)

   burning time < 45 seconds or burning rate > 2,2 mm/s

Metal powders

burning time > 5 minutes and ≤ 10 minutes