ABSTRACT
Both mine managers and fuel technologists know from experience that spontaneous fire risk potential of different coal seams differ widely. Coal was branded according to its local origin only. Regnault was the first to establish an order in the rank correlation of coal. Seylor classified coals based on the elementary analysis of coal substance. He grouped coals into a series of species according to their carbon content, and into a series of genera according to their hydrogen content. Coal categorisation from relative susceptibility to spontaneous heating have never been tried only from volatile matier content. The inflammability of combustibles is normally compared either by measuring the temperature necessary for immediate inflammation or, by noting the temperature at which exothermic reaction just ensues.
