Wet chemical extin-guishing agent was developed for the suppression of commercial kitchen and food-processing fires involving cooking oils, fats, lards, and greases (Class K combustibles). It is a specially formulated, premixed aqueous (40- to 60-percent -water by weight, depending on the manufacturer) solution of inorganic salts (potassium acetate, carbonate, or citrate). The agent provides rapid flame extinguishment by cooling combustibles below their ignition temperature, displacing oxygen and suppressing vapor by forming a soapy foam blanket (saponification) over the burning material. This blanket forms a crust over the hazard, inhibiting oxygen from reacting with the flaming materials. Fire damage is contained within the general area of origin.
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