近年来,国外生产的即发、秒延期和毫秒延期电雷管,品种繁多,如抗杂散电流、抗静电、抗雷电及耐热电雷管等,其相邻延期段之间的间隔时间均有缩短。通常非安全电雷管采用铝管壳;安全电雷管采用铜管壳。捷克斯洛伐克采用钢管壳,波兰采用锌管壳。起爆药内管压入底药内。非安全电雷管使用铝内管,安全电雷管使用铜内管。在起爆药内管上面放置延期药套管。许多电雷管 In recent years, foreign produced instantaneous, second extension and millisecond delay detonators, a wide variety, such as anti-stray current, anti-static, anti-thunder and heat-resistant detonators, the delay time between adjacent extensions have shorten. Usually non-safety electric detonator aluminum shell; safety electric detonator brass shell. Steel tubes are used in Czechoslovakia and zinc tubes are used in Poland. Detonate the drug inside the tube into the drug. Non-safety electric detonator uses aluminum inner tube, safety electric detonator uses copper inner tube. Place the deferred medicine tube on the detonator inner tube. Many electric detonators