For metal powders, if the reaction spreads across the entire length of the sample in 8 minutes, which packing group applies?

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For metal powders, the packing group used for transport is tied to how quickly a reactive spreading occurs in a standard test. The faster the spread, the more hazardous the material and the lower the packing group number (I being the most hazardous, III the least). If the reaction takes eight minutes to propagate along the sample, that timing is relatively slow, placing the material in Packing Group 3—the least hazardous option among the three. In other words, eight minutes indicates slower propagation and thus the least restrictive packaging. The other terms aren’t the right fit here: Class 4.1 is the broad category of flammable solids, and a self-reactive substance is a different hazard designation. Packing Group 2 would correspond to a higher hazard with quicker propagation, not eight minutes.