How do ammonium phosphate-based agents compare to potassium bicarbonate for Class A protection?

Ammonium phosphate-based agents are more suitable for Class A protection due to their ability to effectively extinguish fires involving ordinary combustibles such as wood, paper, and textiles. These agents work by creating a barrier between the fuel and the fire. They also have the ability to cool the burning material and prevent re-ignition, which is critical in managing Class A fires.

In comparison, potassium bicarbonate is primarily formulated for Class B and C fires involving flammable liquids and energized electrical equipment. It is less effective in dealing with the characteristics of Class A fires because it does not have the same cooling properties or the ability to create a thick smothering layer that can inhibit combustion.

Therefore, ammonium phosphate-based agents are recognized as more suitable because they provide a comprehensive approach to suppressing Class A fires effectively, making them a better choice in scenarios specifically targeting those types of fires.