Which item is NOT a component of Division 4.1 flammable solids?

Which item is NOT a component of Division 4.1 flammable solids?

• A. Phosphorus
• B. Wetted explosives
• C. Self-reactive materials
• D. Readily combustible solids

Answer: (A)

Division 4.1 covers flammable solids—solids that can ignite and burn readily or under certain conditions. This includes solids that are readily combustible, as well as materials that can ignite through friction or heat, and even some self-reactive substances that decompose and ignite. Phosphorus is a classic example of a Division 4.1 flammable solid, and self-reactive materials are treated within the same broad group because of their tendency to ignite or violently decompose. Readily combustible solids are explicitly a core part of Division 4.1. Wetted explosives do not belong to Division 4.1. Explosives are classified under Class 1, not as flammable solids, so they’re not considered a component of Division 4.1.

Division 4.1 covers flammable solids—solids that can ignite and burn readily or under certain conditions. This includes solids that are readily combustible, as well as materials that can ignite through friction or heat, and even some self-reactive substances that decompose and ignite. Phosphorus is a classic example of a Division 4.1 flammable solid, and self-reactive materials are treated within the same broad group because of their tendency to ignite or violently decompose. Readily combustible solids are explicitly a core part of Division 4.1.

Wetted explosives do not belong to Division 4.1. Explosives are classified under Class 1, not as flammable solids, so they’re not considered a component of Division 4.1.