AbstractThe mechanism of the thermal decomposition of hydrazinium diperchlorate (HP‐2) has been investigated in the temperature range 100–200°C. l he decomposition can be represented by the chemical equations:\documentclass{article}\pagestyle{empty}\begin{document}$$\begin{array}{l}{\rm Below 140}^{\rm \circ} {\rm C}\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm N}_{\rm 2} {\rm H}_{\rm 6} {\rm (ClO}_{\rm 4} {\rm)}_{\rm 2} \to {\rm N}_{\rm 2} {\rm H}_{\rm 5} {\rm ClO}_{\rm 4} {\rm + HClO}_{\rm 4}\\{\rm Above 140}^{\rm \circ} {\rm C}\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm 24 N}_{\rm 2} {\rm H}_{\rm 6} {\rm (ClO}_{\rm 4} {\rm)}_{\rm 2} \to 8{\rm NH}_{\rm 4} {\rm ClO}_{\rm 4} {\rm + 42 H}_{\rm 2} {\rm O + 26 HClO}_{\rm 4} {\rm + 14 N}_{\rm 2} {\rm O + 7 Cl}_{\rm 2} {\rm + 6\,N}_{\rm 2} {\rm + H}_{\rm 2} \\\end{array}$$\end{document}The solid state decomposition up to 180°C ensues with an activation energy of 23 kcal/mole whereas above 180°C in the molten state the activation energy is 35 kca