Wet Chemical is most commonly used to extinguish cooking oil fires. It   is the primary source of extinguish kitchen fire`s, most of the wet chemical potassium compounds are highly corrosive and have limited uses for fire protection.

Wet chemical suppresses fires by a process called saponification.

Saponification is the process of chemically converting the fatty acid contained in the cooking medium to   soap, or foam, and it accomplishes extinguishment by forming a surface coating.