[en] An Advanced Hadron Facility (AHF) requires a beam pipe with low eddy-current losses and a low beam-coupling impedance. The requirements cannot be met with a solid, conducting beam pipe but may be met by a ceramic pipe with conducting layers, which may have a higher coupling impedance. They have measured and compared the transmission-line impedances for several candidate pipe segments. The results are correlated with the beam-coupling impedance and are compared with calculated values and with AHF requirements