Your chemical tanker was built to the IBC Code and has foam as the main firefighting medium. During one of your safety meetings you review the properties of foam as an extinguishing agent. Which of the following is a correct statement that would be appropriate to share during the meeting?

Correct Answer: Option A — Foam will blanket the fire and cut off the supply of oxygen but it does not provide the best cooling protection for the firefighters.

Foam extinguishes Class B fires by creating a vapor-tight blanket that suppresses oxygen and fuel vapors. Unlike water, foam lacks the high heat capacity required for significant structural cooling. Firefighters must remain aware that foam does not provide the same cooling protection as water fog when approaching a fire.