Which division name covers solids that are readily combustible and may include self-reactive substances and desensitized explosives?

• A. Readily Combustible Solids
• B. Flammable Liquids
• C. Explosive Substances
• D. Flammable Solids

Answer: (D)

Division 4.1, Flammable Solids, covers solids that ignite readily and may include self-reactive substances and desensitized explosives. In IATA/DGR terms, solids with this kind of burning tendency are categorized as flammable solids because their hazard is the potential to ignite quickly or release flammable gases when conditions arise. This is distinct from Flammable Liquids (class 3) and Explosive Substances (class 1), which refer to liquids and explosives, respectively. While you might see the phrase Readily Combustible Solids in some contexts, the official division name used for this hazard is Flammable Solids.