Which type of foam is best used with a non-aerating nozzle for high penetration?

AFFF foam, or Aqueous Film-Forming Foam, is specifically designed to suppress flammable liquid fires effectively, making it particularly suitable for use with non-aerating nozzles that produce a solid stream. AFFF creates a thin film that floats on the surface of the burning liquid, which helps to exclude oxygen and cool the surface, leading to quicker fire knockdown and control.

The high penetration capability of AFFF when used with a non-aerating nozzle is attributed to its composition, which allows it to reach deeper into the burning fuel and spread over the surface efficiently. This quality is crucial in providing a barrier between the fuel surface and the atmosphere to extinguish the fire effectively.

Other foams, while useful in various scenarios, do not offer the same level of penetration or performance characteristics when using a non-aerating nozzle. Different foams have specific applications and performance traits, but AFFF's ability to create an effective aqueous film while achieving high penetration defines its superiority in this context.