What type of foam is created by chemical action with water?

Chemical foam is produced through a reaction that occurs when specific chemical agents interact with water. This type of foam is designed to suppress and extinguish flammable liquid fires by forming a blanket over the burning surface. The chemical reaction generates a foam that is effective in sealing in vapors, thus preventing re-ignition while also cooling the burning materials.

In firefighting, chemical foams often consist of agents that can create an expansive foam blanket quickly. These types of foams are particularly valuable for fighting certain classes of fires, such as those involving flammable liquids, due to their ability to extend coverage rapidly over these materials.

Other foams, like protein and surfactant foam, have different compositions and mechanisms of action. Protein foam is derived from animal products and uses proteins to form foam, while surfactant foam relies on surfactants to lower surface tension and create a foam structure, thus differing fundamentally in production and effectiveness from chemical foam.