Instantaneous Blasting

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simultaneous initiation of a group of explosive charges by means of instantaneous-action electric detonators (the fire beam of the firing head initiates the primary explosive of the detonator instantaneously, without an intermediate retarder) or an instantaneous detonating fuse. The effectiveness of instantaneous blasting in shattering rock is lower than that of short-delay blasting. Instantaneous blasting is used in cases where a very long shock wave is required to provide the desired effect on the ambient, particularly in the case of preliminary formation of cracks (to produce accurately shaped workings) and in two-sided auger-hole blasting.

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