Dipropyl peroxydicarbonate
Dipropyl peroxydicarbonate (trade name Luperox 221) is an organic peroxide with a variety of industrial uses, particularly as an initiator of polymerization. Dipropyl peroxydicarbonate decomposes explosively at 0–10 °C (32–50 °F) due to a self-accelerating exothermic decomposition.
Source: Wikipedia — Dipropyl peroxydicarbonate (CC BY-SA 4.0)