Which statement best describes a Peroxide Forming material?

• A. Oxidizer
• B. Pyrophoric
• C. Disproportionation
• D. Peroxide Forming

Answer: (D)

A substance described as peroxide-forming is one that can generate peroxides when stored, especially if exposed to air over time. Peroxides are reactive oxygen-containing compounds that can accumulate in some solvents and chemicals and become highly sensitive to heat, shock, or friction, posing explosion risks. This category specifically communicates the storage-related hazard of forming dangerous peroxides, which is why the descriptor “peroxide forming” is the accurate label.

The other terms don’t fit as well. An oxidizer is a substance that supplies oxygen to promote combustion, which is a broader hazard and doesn’t specifically capture the stored-formation of peroxides. A pyrophoric material ignites spontaneously in air, which is a different, more immediate hazard. Disproportionation refers to a type of chemical reaction where a species is simultaneously oxidized and reduced to two different species, not a hazard descriptor.