Which foam type is primarily used in aircraft hangars or storage areas?

High expansion foam is primarily used in aircraft hangars or storage areas due to its ability to quickly fill large spaces and provide a blanket of foam that can smother fires effectively. This type of foam is particularly beneficial in environments where there may be a significant fuel load, such as flammable liquids found in aircraft fuel. The high expansion foam can expand to a volume of up to 1,000 times its original liquid volume, allowing it to cover the area sufficiently and displace oxygen, thus extinguishing the fire.

In a hangar setting, where fires can be catastrophic due to the presence of various fuels and materials, high expansion foam provides a rapid response solution to controlling and extinguishing potential fire hazards. Its ability to create a thick blanket that flows into hard-to-reach spaces makes it ideal for the large, open areas typical of aircraft hangars.

While other foam types have their specific applications—like AFFF foam which is designed for suppressing flammable liquid fires, or alcohol-resistant foam suited for fires involving polar solvents—the versatility and expansive coverage provided by high expansion foam make it particularly suited for the unique challenges presented in aircraft hangar environments.