What type of materials is Class A foam primarily used to combat?

Class A foam is primarily used to combat ordinary combustibles and solids, such as wood, paper, cloth, and some plastics. This type of foam alters the surface tension of water, making it much more effective at soaking into these types of materials, thus helping to extinguish fires by providing cooling and creating a barrier to prevent re-ignition.

In firefighting, understanding the types of materials involved in a fire is crucial for selecting the appropriate extinguishing agent. Since Class A foam is formulated specifically to deal with the unique challenges presented by ordinary combustibles, it is an essential tool in firefighting operations. It enhances water's effectiveness and can help in achieving better overall firefighting results.