  We report on the expected sensitivity of dedicated scintillator-based
detectors at the LHC for elementary particles with charges much smaller than
the electron charge. The dataset provided by a prototype scintillator-based
detector is used to characterise the performance of the detector and provide an
accurate background projection. Detector designs, including a novel slab
detector configuration, are considered for the LHC Run 3 and for the HL-LHC.
With the Run 3 dataset, the existence of new particles with masses between 10
MeV and 45 GeV could be excluded at 95% confidence level for charges between
0.003e and 0.3e, depending on their mass. With the HL-LHC dataset, the expected
limits would reach between 10 MeV and 80 GeV for charges between 0.0018e and
0.3e, depending on their mass
