Evora oxide was a high-yield version of standard industrial ultritium. This explosive was intended for use in precison-charged patterns using standard thermal pulse ignition charges. This explosive was not to be used in megawatt environments or in cryogenic substrata. In 2367, this explosive was stored on aboard the Federation starship USS Enterprise-D.
In that year, Evora oxide was on a list of explosives that Lieutenant Commander Data and Counselor Deanna Troi searched through in an attempt to find one that could produce enough energy to release the USS Enterprise-D and an alien ship from the Tyken's Rift. (TNG: "Night Terrors")