How does Class A Foam increase the effectiveness of water?

Class A Foam increases the effectiveness of water primarily by reducing surface tension. When water is used to extinguish a fire, its high surface tension can limit its ability to penetrate combustible materials effectively, as water tends to bead up rather than soak in. Class A Foam is specifically designed to lower this surface tension, which allows water to spread more easily and penetrate deeper into fuels such as wood, paper, and other combustible materials.

This improved penetration helps to cool the burning materials more efficiently and enhances the foam's ability to suffocate the fire. Additionally, the foam creates a blanket that can cover burning materials, preventing the release of flammable vapors and inhibiting the rekindling of the fire. Therefore, reducing surface tension is critical in making water a more effective extinguishing agent when paired with Class A Foam.