The final work of the title " Flammable and Pyrophoric Substances" addresses the types of flammable and pyrophoric substances and describes how their inflammation and self- ignition occurs , and also, what conditions must be met in order to cause a fire. The text is accompanied by numerous chemical reactions and tables that summarize important data. Through the work, one learns what to look for so that they do not cause a fire indirectly without being even aware that you have done so by your negligence. Sometimes due to carelessness but also recklessness, one can create the ideal conditions for a fire to occur, which can lead to great damage and, unfortunately, a great number of human casualties. In some situations reaction may be timely, if some fire indicators are visible (eg. smoke, odor of ignition, etc.) and sometimes it is not possible to react. The research section describes the fire intervention of the INA Oil Industry, where a fire broke out on domestic gas cylinders.