Dangerous Goods by Road
when substances not mentioned by name are assigned to one of the entries listed in 2.2.41.3 on the
basis of the test procedures in accordance with the manual of tests and criteria, part iii, sub-section
33.2.1, the following criteria apply:
(a) with the exception of metal powders or powders of metal alloys, powdery, granular or pasty
substances shall be classified as readily flammable substances of class 4.1 if they can be easily
ignited by brief contact with an ignition source (e.g. a burning match), or if, in the event of
ignition, the flame spreads rapidly, the burning time is less than 45 seconds for a measured
distance of 100 mm or the rate of burning is greater than 2.2 mm/s;
(b) metal powders or powders of metal alloys shall be assigned to class 4.1 if they can be ignited
by a flame and the reaction spreads over the whole length of the sample in 10 minutes or less.
solids which may cause fire through friction shall be classified in class 4.1 by analogy with existing
entries (e.g. matches) or in accordance with any appropriate special provision.