or extinguishing substances such as oils, alcohols, chemicals, petrol, varnishes, etc., foam systems are used. Foam systems are used which are characterised by high extinguishing efficiency as they cover a pre-programmed area with a layer of foam. The foam is produced by mixing AFFF or AR-AFFF foaming agent and water. The appropriate thickness of the foam layer cuts off the air supply and lowers the temperature of the substance being extinguished.