electric blasting cap

A blasting cap designed for and capable of detonation by means of an electric current.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Electric Blasting Cap

a device for detonating an explosive charge by means of an electric current. It consists of a detonator and an electric fuze in a single cartridge.

Current sources used to trigger electric blasting caps include shot exploders and, less often, power or lighting mains. Various designs use a bridge wire (widely used in the USSR), a current-conducting ignition charge, and spark discharges. Industrial types are classified according to operating time as instantaneous, short delay, and long-delay types. The detonator in instantaneous types is triggered directly by the electric fuze; in both delay types it is triggered through a delay composition. Depending on the purpose and the conditions of use, electric blasting caps may be classified as waterproof and nonwaterproof, permissible (for mines that are dangerous because of gas and dust) and nonpermissible, normal and low-sensitivity, antistatic, thermally stable (for use in the petroleum industry, where ambient temperatures reach 270°C), and seismic (for seismic prospecting) types. They are widely used for industrial blasting.

REFERENCE

Rossi, B. D., and Z. G. Pozdniakov. Promyshlennye vzryvchatye veshchestva i sredstva vzryvaniia. Moscow, 1971.

V. M. KOMIR

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References in periodicals archive

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A brief history of initiating systems development (not exclusively Orica's) Decade Key Developments 1740s Electric Ignition of Gunpowder [*] 1830s Safety Fuse [**] 1860s Fuse Blasting Detonator [**] 1870s Electric Blasting Dynamo [**] 1870s Electric Blasting Machine [*] 1880s Electric Blasting Cap [*] 1900s Lead Sheathed Detonating Cord [*] 1900s Regular Delay Blasting Cap [*] 1930s Textile Sheathed Detonating Cord [***] 1940s Millisecond Delay Blasting Cap [*] 1970s Signal Tube Detonator [***] 970s 1st Generation Electronic Detonator [***] 1980s Indirectly Coupled, Induced Current Detonator [***] 1990s 2nd Generation Electronic Detonator [***] 2000 i-kon Source: (*.)Encyclopaedia Britannica on-line (www.britannica.com) (**.)Morhard, Robert C.

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