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Fire hazard of linear hydrocarbons binary mixtures that sharply distinguish by boiling points has been studied. It is obtained that small additions of highly volatile component (in amount of 1-2% by volume) sharply decrease (30-50°C) temperature flammability limits in comparison with pure linear hydrocarbons. It is shown that effect of additions of highly volatile components in small amounts is expressed in the unusual fact that fire temperature of such mixture proves to be higher than upper temperature flammability limit and spreads on different classes of chemicals and it seems to be an universal phenomenon.