Most things will burn if the temperature is high enough. Always use the safest materials that you can and try not to store too much at any one time. Good housekeeping should ensure that loose paper, cardboard, plastics and other flammables do not lie about. Any containers that have stored flammable products but are now empty are STILL flammable. Any highly flammable products should be stored away from the main building and should be kept in a metal storage container if possible; there should be a notice warning others of the presence of these liquids.