The purpose of that demonstration is to show that melt ETN has critical diameter of at least in my opinion 5mm unconfined(the Tetryl I think decreases
it). It's plain luck if it works melted in small diameters for you, if you heat it till it explodes, then the initial temperature is aiding the
explosive decomposition. With confinement(thicker case or buried in mud and wet sand) the diameter decreases. |