It is a hazardous waste characteristic which applies to waste liquids with a flash point less than 140°F or solids capable of spontaneous combustion under normal temperature and pressure.

• A. Toxicity
• B. Ignitability
• C. Reactivity
• D. Corrosivity

Answer: (B)

Ignitability is being tested here. A hazardous waste is considered ignitable if a liquid has a flash point below 140°F, meaning its vapors can form ignitable mixtures at typical room temperatures and readily catch fire. For solids, the rule covers substances that can spontaneously combust under normal temperature and pressure, meaning they can heat up and ignite without an external flame or spark. This combination of conditions marks the waste as ignitable and requires special handling and storage to prevent fires.

Toxicity, by contrast, concerns whether a waste leaches harmful substances into the environment. Reactivity covers wastes that can detonate, violently react with water, or release toxic gases. Corrosivity involves extreme pH that can corrode metals.