Which division corresponds to spontaneously combustible materials?

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Multiple Choice

Which division corresponds to spontaneously combustible materials?

Explanation:
Spontaneously combustible materials are solids that heat up on their own and can ignite in air without an external ignition source. This behavior is classified as Flammable Solids Division 4.2. Division 4.1, by contrast, covers solids that ignite through friction, heat, or moisture rather than self-heating. Division 3 covers flammable liquids, which are liquids, not solids. Division 5.1 covers oxidizers, which are substances that can contribute to burning but aren’t themselves spontaneously combustible solids. So the division that matches spontaneously combustible materials is Flammable Solids Division 4.2.

Spontaneously combustible materials are solids that heat up on their own and can ignite in air without an external ignition source. This behavior is classified as Flammable Solids Division 4.2. Division 4.1, by contrast, covers solids that ignite through friction, heat, or moisture rather than self-heating. Division 3 covers flammable liquids, which are liquids, not solids. Division 5.1 covers oxidizers, which are substances that can contribute to burning but aren’t themselves spontaneously combustible solids. So the division that matches spontaneously combustible materials is Flammable Solids Division 4.2.

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