To effectively suppress vapors from a fuel spill, a foam blanket must be:

A foam blanket must be thick and stable to effectively suppress vapors from a fuel spill. A dense foam layer provides a barrier between the fuel vapors and the atmosphere, preventing the vapors from escaping and potentially igniting. The thickness of the foam is important because it ensures that the blanket can adequately cover the surface of the spilled fuel, thereby enhancing its ability to suppress flammable vapors.

Stability is equally crucial; a stable foam blanket will maintain its integrity and remain in place, even in challenging conditions such as wind or movement on the surface of the liquid. If the foam is unstable, it may break apart or dissipate, leading to a failure to contain the vapors effectively. This makes a thick and stable foam blanket the ideal choice for vapor suppression in fire fighting scenarios involving fuel spills.