Compared to wet foam, dry foam provides:

Dry foam is characterized by its ability to create a thicker, more stable blanket over burning materials, which helps in preventing re-ignition and prolonging the duration of its effectiveness. This is particularly advantageous in fire suppression, as it adheres better to surfaces and maintains its integrity longer than wet foam. Therefore, dry foam tends to provide longer-lasting coverage due to its lower water content and reduced drain time compared to wet foam.

In addition to this, dry foam can create a barrier that not only suffocates the fire but also offers insulation to hot surfaces, helping to protect them from damage and slow down the combustion process. These attributes make dry foam suitable for certain firefighting scenarios, especially in dealing with class B fires involving flammable liquids, where prolonged effectiveness is critical for extinguishing the fire and preventing flare-ups.

While the other options mention aspects like drain time, penetration, and knockdown speed, dry foam is specifically valued for its lasting power, making it the ideal choice in situations where long-term suppression is crucial.