Because of their high auto-ignition temperatures, cooking oil fires are difficult to extinguish. In order to extinguish these fires they need to be cooled sufficiently therefore conventional extinguishers are not as effective due to risk of flash back and re-ignition.
Foam is an aerated solution which is used for fire prevention and firefighting. Foam concentrate is the full strength liquid which is diluted and processed to produce foam. The foam solution is the mixture produced by diluting foam concentrate with water before processing to make foam.