The compound 2-oxy-4,6-dinitramine-s-triazine (DNAM) is a nitrated derivative of 2,4,6-triamine-s-triazine that, due to its energetic properties, is a candidate substance for energetic formulations. The thermal decomposition of DNAM and preliminary information on the exothermic reaction kinetics were studied by simultaneous thermal analysis in non-isothermal conditions. The Arrhenius parameters were estimated according to well-established methods but emphasis is given on statistical analysis of the correspondent regression procedures. DNAM presents good thermal stability in a wide temperature range below its exothermic decomposition that starts, according to the heating rates employed, above 473 K. The results of the kinetic analysis are critically discussed taking into account the complexity of the exothermic reaction, its relation with the heating rate, and some problems that are typical in the reaction kinetics of solids.