Class A foam is used primarily for which type of fires?

Class A foam is specifically designed for firefighting operations involving ordinary combustibles such as wood, paper, textiles, and some plastics. When applied, the foam cools the fire and creates a barrier that helps to prevent reignition by smothering the flames and reducing the release of flammable vapors. One of the main advantages of Class A foam is its ability to enhance water’s effectiveness by reducing surface tension, allowing water to penetrate deeper into combustible materials and improve its extinguishing capabilities.

Using Class A foam for other types of fires, such as those involving flammable liquids or electrical fires, is not advisable because it may not effectively combat those specific scenarios. Flammable liquids, for instance, require Class B foams that are specifically formulated to form a blanket over the liquid, preventing vapor release and extinguishing the fire. Electrical fires necessitate methods that do not conduct electricity, making foam unsuitable in many cases.