What effect does heat from a fire have on Class B foam?

Heat from a fire has a significant impact on Class B foam, particularly regarding its effectiveness in suppression efforts. Class B foam is designed to combat flammable liquid fires by creating a barrier that separates the fuel from the fire and helps to cool the area. When there is insufficient foam to cover the burning surface, the heat can break down the foam's structure, leading to a loss of its ability to suppress the fire effectively. In this context, if the foam is not applied in adequate amounts, the intense heat can indeed destroy its efficacy, rendering it less effective at firefighting.

In contrast, the properties of foam, such as its ability to spread and adhere to surfaces, rely heavily on the presence of a sufficient foam blanket. Without enough foam, the heat from the fire can compromise the foam's ability to form a protective layer, making it critical to apply an adequate amount to combat the fire effectively. This underscores the importance of proper application techniques when using foam in firefighting operations.