Wet Chemical fire extinguishers are especially designed for fat and oil fires (Class F). The extinguishers use saponification agents to quickly kill the fire and stop re-ignition. They are able to do this by forming a thick layer on the fat or oil, turning it into a soap like substance. Wet chemical extinguishers are also suitable for Class A fires (wood and paper). Approved to AS/NZS 1841.3. BRT Fire and Rescue proudly stocks the highest quality of Wet Chemical Fire Extinguishers.