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R. Meyer J. Köhler A. Homburg Explosives

R. Meyer J. Köhler A. Homburg Explosives

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Inhibited Propellant<br />

blasting cap or by a booster. The non-brisant ignition is termed inflammation.<br />

The sensitivity of explosives to inflammation varies widely. Black powder<br />

can be exploded by a spark from a spark-producing tool; smokeless<br />

powders are ignited by the brief flame jet produced by striking a<br />

percussion cap. On the other hand, the combustion of an ion-exchanged<br />

W Permitted Explosive, ignited by a gas flame, is extinguished<br />

as soon as the flame source is removed.<br />

W Initiating <strong>Explosives</strong> always detonate when inflamed.<br />

Inhibited Propellant<br />

Oberflächenbehandelter Treibsatz; propellant traité de surface<br />

A propellant grain in which a portion of the surface area has been<br />

treated to control the burning.<br />

Initiating <strong>Explosives</strong><br />

primary explosives; Initialsprengstoffe;<br />

explosifs d’amorçage; explosifs primaires<br />

Primary explosives can detonate by the action of a relatively weak<br />

mechanical shock or by a spark; if used in the form of blasting caps,<br />

they initiate the main explosive. They are also filled in percussion caps<br />

mixed with friction agents and other components.<br />

An initiating explosive must be highly brisant and must have a high<br />

triggering velocity. The most important primary explosives are mercury<br />

fulminate, lead azide, lead trinitroresorcinate, silver azide, diazodinitrophenol,<br />

tetrazene, and the heavy metal salts of 5-nitrotetrazole,<br />

which is used as an additive in primers. Initiating charges must be<br />

transported only if they are already pressed into capsules; the latter<br />

are usually made of aluminum, and sometimes of copper, while plastic<br />

capsules are used for special purposes (W Blasting Caps; W Bridgewire<br />

Detonators; W Bullet Hit Squib).<br />

Initiation<br />

190<br />

Zündung; mise à feu<br />

Initiation means to set off explosive charges. The decomposition of an<br />

explosive can undergo W Deflagration (subsonic propagation rate) or<br />

W Detonation (supersonic propagation rate), depending on the manner<br />

and intensity of the ignition and on amount of W Confinement.

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