Hexanite was a castable German military explosive developed early in the 20th century before the First World War for the Kaiserliche Marine, intended to augment supplies of trinitrotoluene (TNT), which were then in short supply. Hexanite is significantly more powerful than TNT on its own. The most common hexanite formula (by weight) was 60% TNT and 40% hexanitrodiphenylamine.
Typically, hexanite was used in underwater naval weapons e.g. warheads for the G7a and G7e series torpedoes  and the 300 kilogram main explosive charge in aluminium-cased  buoyant, moored "EMF" magnetic mines capable of being laid by U-boats in 200, 300 or 500 metres of water. 
The Japanese used this in World War II as explosive compound type 97 & 98. 
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