Which of these is NOT a true statement about dry chemical agents?

Dry chemical agents are primarily designed to combat flammable liquid fires, such as those involving gasoline or oil, making them effective on running fuel fires. They work by interrupting the chemical reaction in the fire and preventing further combustion.

In contrast, when it comes to Class A fires, which involve materials like wood, paper, or textiles that produce embers or ash, dry chemical agents may not be as effective. These agents can smother flames but do not cool the material sufficiently to prevent re-ignition. Therefore, while dry chemical agents can be used on Class A fires, they are not ideal or primarily useful for this fire class compared to other extinguishing agents specifically made for them, such as water or foam.

Additionally, dry chemical agents are known not to prevent flashback, which refers to the re-ignition of fuels that are in contact with the agent after the initial extinguishment. Flashback prevention requires a thorough dousing and soaking of the material, which is not achieved through dry chemicals effectively.

Finally, dry chemical agents are typically applied through hand lines, allowing firefighters to direct the chemical toward the flames accurately. This application method is essential for effectively controlling the fire.

Thus, identifying that dry chemical agents are not particularly useful for