In this work we discuss one of the principal parameters to control for prod
ucing pieces of(Hg,Re)-1223 for device applications. The first prerequisite
is the mixing of the cations which should be as good as possible and the d
egree of oxygen in the phase. The influence of the precursor oxygenation is
discussed. It is shown that overdoped samples of (Hg,Re)-1223 have an incr
eased irreversibility line. Finally the possibility of reprocessing sintere
d superconducting samples is shown, a very important aspect for the prepara
tion of several ceramic electronic pieces.