Ignitability is defined as the propensity of a waste stream to flash.

Ignitability is defined as the propensity of a waste stream to flash.

• A. Propensity to explode
• B. Propensity of a waste stream to flash
• C. Propensity to corrode metal
• D. Propensity to dissolve in water

Answer: (B)

Ignitability is about whether a waste can catch fire under foreseeable conditions. The key idea is the vapor that can form from the waste and ignite, which is captured by the concept of a flash point—the temperature at which a liquid gives off enough vapors to ignite in air. So describing ignitability as the propensity to flash directly reflects this definition: if a waste has a low enough flash point, it is considered ignitable because it can flash and ignite. In practice, liquids with a flash point at or below 60°C are classified as ignitable, with some solids capable of ignition under ordinary conditions as well. The other ideas describe different hazards: an explosive tendency refers to explosive hazards, corrosivity relates to corrosive effects on materials, and dissolution concerns solubility or reactivity. None of those define ignitability, which is specifically about flashing and ignition potential.

Ignitability is about whether a waste can catch fire under foreseeable conditions. The key idea is the vapor that can form from the waste and ignite, which is captured by the concept of a flash point—the temperature at which a liquid gives off enough vapors to ignite in air. So describing ignitability as the propensity to flash directly reflects this definition: if a waste has a low enough flash point, it is considered ignitable because it can flash and ignite. In practice, liquids with a flash point at or below 60°C are classified as ignitable, with some solids capable of ignition under ordinary conditions as well.

The other ideas describe different hazards: an explosive tendency refers to explosive hazards, corrosivity relates to corrosive effects on materials, and dissolution concerns solubility or reactivity. None of those define ignitability, which is specifically about flashing and ignition potential.