What characteristic defines Class 5 oxidizing substances?

Class 5 oxidizing substances are defined by their ability to support combustion. This means that these materials can facilitate or enhance the burning of other substances by providing oxygen or other reactive elements that encourage combustion. In practical terms, when these substances are present, they can greatly increase the intensity of a fire or allow materials to ignite at lower temperatures than would normally be possible.

The combustion-supporting property of Class 5 oxidizers is critical in understanding their behavior in various environments, especially in industrial and safety contexts. This characteristic is essential for proper handling, storage, and transportation of these materials to prevent dangerous fire-related incidents.

In contrast, the other options present misunderstandings of the properties of oxidizing agents. For example, oxidizers are not inert and actively contribute to combustion rather than neutralizing flammable materials or being hazardous solely through ingestion. Recognizing the true nature of these substances is crucial for safety protocols regarding their use.