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A contact explosive is a chemical substance that explodes violently when it is exposed to a relatively small amount of energy (e.g. friction, pressure, sound, light). Though different contact explosives have varying amounts of energy sensitivity, they are all much more sensitive relative to other kinds of explosives.
Impact – Sensitivity is expressed in terms of the distance through which a standard weight must be dropped onto the material to cause it to explode. Friction – Sensitivity is expressed in terms of the amount of pressure applied to the material in order to create enough friction to cause a reaction.
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Explosive chemicals (6 C, 141 P) D. Explosive detection (1 C, 20 P) Detonators (19 P) E. Explosives engineering (3 C, 32 P) Explosive polymers (4 P)
Additionally, targets with onboard electronics or computers can be damaged by metal fragments when they explode on the surface. Ignition is often delayed by varying means until after impact. [9] Some explosive projectiles, such as high-explosive incendiary bullets, contain an incendiary charge intended to ignite explosives within the shell. [9]
The burning of some chemicals in the aftermath of the disaster — a decision made by authorities to avoid an explosion — is also complicating an already fraught situation that has sparked fears ...
Stabo. Fuzes for air-dropped bombs have generally used an internally mounted inertia fuze, triggered by the sudden deceleration on impact. Owing to the risk of an aircraft crash, or even the need to land with an undropped bomb still on board, these are protected by sophisticated safety systems so that the fuze can only be triggered after it has been dropped intentionally.
Chemical shells contain just a small explosive charge to burst the shell, and a larger quantity of a chemical agent or riot control agent of some kind, in either liquid, gas or powdered form. In some cases such as the M687 Sarin gas shell, the payload is stored as two precursor chemicals which are mixed after the shell is fired.