Which type of fire fire extinguishers use foam?

Foam fire extinguishers are specifically designed to combat fires that involve flammable liquids, such as petrol, oil, and other similar substances, which are categorized as liquid fires. The foam smothers the flames by forming a blanket over the surface of the liquid, preventing oxygen from fueling the fire and also cooling the burning material.

Additionally, foam extinguishers can also be effective for solid fires, especially when the solid materials are combustible and can produce flammable vapors, such as wood, paper, or textiles. By covering these solid materials with foam, the extinguisher not only cools the fire but also reduces the chances of reignition.

It's important to note that foam extinguishers are not suitable for electrical fires or certain types of hazardous materials, as they can conduct electricity or react dangerously. Thus, understanding the dual application of foam extinguishers in both liquid and solid fire situations emphasizes their versatility and effectiveness in fire safety.