Plastic explosive used in military
bombs and
missiles. Consists of 75%
HMX (cyclotetramethylenetetranitramine) and 25%
TNT (trinitrotoluene). It has a
buff (yellowish) color and explodes with a
speed of about 8,500 metres per
second.
I've heard (but don't quote me on this) that Octol is outrageously expensive.