What type of foam allows for high penetration when using a non-aerating nozzle?

AFFF foam, or Aqueous Film Forming Foam, is designed for use on flammable liquid fires and is particularly effective in creating a thin film over the fuel surface, which helps to suppress vapors and prevent ignition. When using a non-aerating nozzle, AFFF foam can penetrate into burning liquid fuels, allowing it to form a barrier that can extinguish the fire more effectively.

This characteristic makes AFFF foam a preferred choice in various firefighting scenarios, especially involving hydrocarbons. Its ability to allow high penetration is essential when trying to combat fires involving fuels that may react poorly to other types of foam or extinguishing agents. The unique formulation of AFFF facilitates rapid spread and coverage over the burning material, contributing to its effectiveness in extinguishing fires and preventing re-ignition.