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Detonating cord is a thin, flexible plastic tube usually filled with pentaerythritol tetranitrate. With the PETN exploding at a rate of approximately 6,400 m/s , any common length of detonation cord appears to explode instantaneously. It is a high-speed fuse which explodes, rather than burns, and is suitable for detonating high explosives. The velocity of detonation is sufficient to use it for synchronizing multiple charges to detonate almost simultaneously even if the charges are placed at different distances from the point of initiation. It is used to reliably and inexpensively chain together multiple explosive charges. Typical uses include mining, drilling, demolitions, and warfare.
"Cordtex" and "Primacord" are two of many trademarks which have slipped into use as a generic term for this material.