The S-3-AB fire extinguishing agent is a low multiple foam extinguishing agent. It is suitable for all low energy foam and water system fire-extinguishing facilities. It is suitable for fire prevention and rescue in large enterprises, crowded places and fire forces category A and class B (non water soluble liquids) in petroleum, chemical industry, civil aviation, Airport and storage area. Because of the convenience of carrying and operation, fire extinguishers are more suitable for the prevention and fighting of fires in residential, industrial and mining enterprises, ships, vehicles, public places and other production places.