Explosion

This critical event is only associated with solid substances classified as explosives. It corresponds to a change of physical state of the substance (LPI) by action of a energy/heat source or by action of a chemical source (incompatible reagent). This change of state implies combustion of a solid with overpressure generation (or an explosion) due to a violent and spontaneous reaction. In case of a substance stored in a closed vessel, an explosion (or an explosive decomposition of solid) is considered as an internal cause of overpressure leading to a loss of containment (for example, catastrophic rupture or breach on the shell).