[member="Nyos Val"]
Rarity and its ability to absorb electromagnetic energy, because of this statement in the wookiepedia: It was theorized the atomic structure of the pyronium itself stored the energy; when the quantum shells were unable to accommodate more, the energy was theoretically shunted into a localized
hyperspatial matrix, making its absorptive potential extraordinarily high.
Items on the restricted materials list aren't up for discussion to be removed, the only place that a restricted material can move is to the banned list.