labeled as SEMTEX 1A, since 1967 as SEMTEX H, and since 1987 as SEMTEX 10.

Originally developed for Czechoslovak military use and export, Semtex eventually became popular with armed groups and insurgents because, prior to the 2000s, it was extremely difficult to detect, as in the case of Pan Am Flight 103.

Composition

The composition of the two most common variants differ according to their use. The 1A (or 10) variant is used for mining,

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