What are the five classes of fire extinguishers based on?

Fire extinguishers are classified into five distinct classes based on the type of fuel that is burning. This classification system is essential for ensuring that the appropriate extinguisher is used for specific types of fires, as different materials require different extinguishing agents to effectively put out the flames.

The five classes are as follows: Class A for ordinary combustibles like wood and paper, Class B for flammable liquids such as gasoline and oil, Class C for electrical fires, Class D for combustible metals, and Class K for kitchen fires involving cooking oils and fats. Each class corresponds to the nature of the combustible material, which dictates the most effective extinguishing agent.

Understanding this classification is crucial for safety in emergency situations, as using the wrong type of extinguisher can exacerbate a fire, rather than extinguishing it. This knowledge allows individuals to make informed decisions when responding to a fire, which can significantly impact safety and effectiveness during such emergencies.