US Patent 10518120 Fire extinguishing compositions

A fire extinguishing concentrate contains water, a first surfactant which is an anionic surfactant, a second surfactant which is an amphoteric surfactant, a third surfactant which is selected from an anionic surfactant and an amphoteric surfactant, the third surfactant being different from the first and second surfactants, and water, along with optional ingredients. The concentrate may be combined with water to provide a fire extinguishing composition that may be applied to a fire for a time and in an amount effective to extinguish the fire.