  The lifetime of trapped ion ensembles corresponds to a crucial parameter
determining the potential scalability of their prospective applications and is
often limited by the achievable vacuum level in the apparatus. We report on the
realization of a room-temperature $^{40}{\rm Ca}^{+}$ ion trapping vacuum
apparatus with unprecedentedly low reaction rates of ions with a dominant
vacuum contaminant: hydrogen. We present our trap assembly procedures and
hydrogen pressure characterization by analysis of the CaH$^+$ molecule
formation rate.
