Which classes of liquids are considered combustible?

The correct answer identifies Classes II, III A, and III B as combustible liquids due to their flash points and characteristics.

Class II liquids have a flash point between 100°F and 140°F, while Class III A liquids have a flash point between 140°F and 200°F. Class III B liquids possess a flash point at or above 200°F. All these classes can ignite and burn under the right conditions, which classifies them as combustible.

Understanding the definitions and properties of these classes of liquids is crucial for fire safety and prevention practices. Combustible liquids can pose significant risks in terms of fire hazards, especially in settings where ignition sources are present. Recognizing these classes helps in implementing appropriate fire safety measures, such as proper storage and handling protocols.

Classes I A, I B, and I C are classified as flammable liquids, which have lower flash points and are considered more hazardous than combustible liquids. Class IV liquids are typically considered non-combustible, presenting even less risk compared to the other classes. Therefore, they do not meet the criteria for being labeled as combustible.