What is typically used to extinguish a Class B fire?

Class B fires involve flammable liquids such as gasoline, oil, or grease, which can spread quickly and are often more dangerous than other types of fires. The use of foam or dry chemical agents is preferred because these materials can effectively suppress the flames and prevent re-ignition of the burning liquid.

Foam works by creating a barrier between the fuel and the oxygen in the air, smothering the fire. Dry chemical agents, such as those based on ammonium phosphate or sodium bicarbonate, interrupt the chemical reaction happening in the fire, effectively extinguishing it. Unlike water, which can spread flammable liquids and potentially make the fire worse, foam and dry chemical agents are specifically designed to tackle Class B fires safely and effectively.

Understanding the properties and behaviors of different extinguishing agents is crucial for effective fire management, especially concerning safety and preventing fire escalation.