Lead styphnate decomposition temperature

A number of authors have investigated the thermal decomposition of lead styphnate Hailes [48] examined the decomposition of this substance within the temperature range 200 to 228°C, and Gamer, Gomm and Hailes [49] derived the following equation for the decomposition curve ... 

According to T. Urbanski and Kruszynska [41] thallium styphnate has similar properties to those of lead styphnate. The former, however, is much more sensitive to impact than the latter. Their sensitiveness to temperature is similar contact with a metal surface heated to 351°C causes explosion after 1 sec. The activation -energy of thermal decomposition is nearly 80 kcal/mole. 

However, when lead azide, lead styphnate, mercury fulminate, RDX, TNT, and PETN were subjected to bombardment with a negative pion beam, no explosions or decompositions were observed for any of the explosives. The analysis had predicted initiation only for RDX. Also it had indicated that nuclear fission events would produce higher energy densities and greater temperature increases than were actually observed. 

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