Which type of foam achieves high penetration when used with a non-aerating nozzle?

AFFF foam, or Aqueous Film-Forming Foam, is specifically designed to create a thin film that enhances its ability to penetrate burning fuels, particularly in flammable liquid fires. When used with a non-aerating nozzle, AFFF foam can effectively spread across surfaces, significantly improving its ability to penetrate through the fuel.

This capability is crucial in extinguishing fires involving hydrocarbons because AFFF forms an aqueous film that not only suppresses the flames but also cools the surfaces to prevent re-ignition. The chemical properties of AFFF foam allow it to achieve rapid penetration into the burning material, making it an exceptional choice for firefighting in situations with flammable liquids.

The other types of foam mentioned may have specific uses but do not demonstrate the high penetration capabilities that AFFF provides, particularly when paired with a non-aerating nozzle designed to deliver a consistent flow of foam without introducing air into the mixture.