What type of fire extinguisher is suitable for Class B fires?

Class B fires involve flammable liquids such as gasoline, oil, grease, and solvents. The correct fire extinguisher for these types of fires is one that can effectively smother the flames and prevent re-ignition. Foam and dry chemical extinguishers are specifically designed for Class B fires because they can form a barrier over flammable liquids, cutting off the oxygen supply and extinguishing the fire.

Foam extinguishers create a blanket of foam that sits on the surface of the burning liquid, while dry chemical extinguishers release a powder that interrupts the chemical reaction of the fire. Both of these options are highly effective for addressing Class B fire hazards.

In contrast, water-based extinguishers are unsuitable for Class B fires as water can spread the burning liquid, potentially worsening the situation. Carbon dioxide extinguishers can be effective for Class B fires but are not as versatile as foam or dry chemical for all types of flammable liquids. Wet chemical extinguishers are specifically designed for Class K fires, which involve cooking oils and fats, making them less relevant for general Class B fire incidents.