Wet Chemical Fire Extinguisher are suitable for use on Class A & F Fires. These ranges of extinguishers are specialists in regards to cooking fires caused by fat and oils.
Wet Chemical Fire Extinguishers contains a solution of potassium which effectively attacks the flame in two methods:
Firstly the mist cools the fire and lowers the temperature to stop the fire spreading, also prevents splashing of the hot oils/fat.
Secondly, the potassium salts react with the hot oil and cause the process of saponification, coating the surface of the cooking oil or fat in soapy foam that is non-combustible and acts as a barrier between the fat and oil.