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Blasting Cap No. 8-M

Blasting Cap No. 8-M is a Soviet flame-initiated blasting cap, consisting of a cylindrical copper shell open at one end, in the lower part of which a high explosive (tetryl, PETN, or RDX) is pressed, with a primary explosive (mercury fulminate) above it. The charge of the blasting cap is covered on top by a cup with a hole in the center.

It is used for manufacturing igniter tubes when conducting blasting operations by the fuse ignition method, as well as in the design of certain engineer munitions.

Blasting Cap No. 8-M must be handled with extreme care; it is sensitive to impact, compression, and heating. It must be transported exclusively in a protective tube or case. If it detonates in the hands, it may sever several fingers.

Blasting cap made of copper (not KD-8M)
Blasting cap made of copper (not KD-8M)
Blasting cap made of copper (not KD-8M)

Technical and Tactical Characteristics of KD 8-A

Initiation method
Flame-initiated
Shell material
Copper
Filling composition
Mercury fulminate, tetryl, PETN, or RDX
Mass of mercury fulminate
0.5 g
Mass of explosive (tetryl, PETN, or RDX)
1.02 g
Shell diameter (external)
6.8-7.05 mm
Shell diameter (internal)
6.3-6.5 mm
Shell length
47-51 mm
Blasting caps: a — No. 8-A; b — No. 8-M; c — training; 1 — shell; 2 — cup; 3 — TNRS; 4 — lead azide; 5 — tetryl (PETN or RDX); 6 — mesh; 7 — mercury fulminate; 8 — inert substance; 9 — cardboard disk; 10 — white stripe (band).
Blasting caps: a — No. 8-A; b — No. 8-M; c — training; 1 — shell; 2 — cup; 3 — TNRS; 4 — lead azide; 5 — tetryl (PETN or RDX); 6 — mesh; 7 — mercury fulminate; 8 — inert substance; 9 — cardboard disk; 10 — white stripe (band).
Blasting caps: a — No. 8-A; b — No. 8-M; c — training; 1 — shell; 2 — cup; 3 — TNRS; 4 — lead azide; 5 — tetryl (PETN or RDX); 6 — mesh; 7 — mercury fulminate; 8 — inert substance; 9 — cardboard disk; 10 — white stripe (band).
Explosion of KD 8-A (the explosion of KD 8-M is identical), still frame from the video below
Explosion of KD 8-A (the explosion of KD 8-M is identical), still frame from the video below
Explosion of KD 8-A (the explosion of KD 8-M is identical), still frame from the video below
The author of the video demonstrates how dangerous KD 8-A is (the hazard from KD 8-M is identical)
Video by Lisnyk on the rules for handling and storing detonators