Which of the following are examples of Division 4.2 materials?

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Multiple Choice

Which of the following are examples of Division 4.2 materials?

Division 4.2 covers materials that are liable to self-heat, meaning they can heat up and potentially ignite without an external flame. Oily rags are a classic example because oils trapped in cloth can oxidize slowly and generate heat. Oil-containing residues like seed cake can do the same, storing oils that slowly oxidize and raise temperature. Activated carbon, particularly when finely divided or in contact with oils or moisture, can generate heat through adsorption and exothermic processes and may reach ignition temperatures if confined. Water doesn’t have this self-heating risk, and plain paper or wood aren’t typical Division 4.2 self-heating materials; they’re more generally combustible substances and are handled under different hazard classifications.

Division 4.2 covers materials that are liable to self-heat, meaning they can heat up and potentially ignite without an external flame. Oily rags are a classic example because oils trapped in cloth can oxidize slowly and generate heat. Oil-containing residues like seed cake can do the same, storing oils that slowly oxidize and raise temperature. Activated carbon, particularly when finely divided or in contact with oils or moisture, can generate heat through adsorption and exothermic processes and may reach ignition temperatures if confined.

Water doesn’t have this self-heating risk, and plain paper or wood aren’t typical Division 4.2 self-heating materials; they’re more generally combustible substances and are handled under different hazard classifications.

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