Final answer:
To fight a large spill fire involving a product represented by the red fire placard #2398, AFFF fire fighting foam should be used.
Step-by-step explanation:
In this case, the red fire placard #2398 indicates a flammable liquid on a highway cargo tanker. To fight a large spill fire involving this type of product, a fire fighting foam called Aqueous Film-Forming Foam (AFFF) should be used. AFFF is a type of foam concentrate that is specially designed to suppress fires involving flammable and combustible liquids.
The foam works by forming a thin film on the surface of the liquid, which helps to separate the fuel from the oxygen in the air. This prevents the fire from spreading and re-igniting. AFFF has excellent fire extinguishing capabilities and is commonly used in situations like this.
In summary, to fight a large spill fire involving a product represented by the red fire placard #2398, AFFF fire fighting foam should be used.