  Plastic scintillators are widely used in particle detectors when precise
timing information is required. As a basis for comparing different detectors we
use such a characteristic as the time resolution per 1MeV detected energy, i.e.
the expected time resolution assuming the deposited energy in the scintillator
equals to 1MeV and all the scintillation light is collected to the photosensor.
In this work we measure this parameter with BC422 plastic scintillator read out
by different SiPMs. The best obtained value is about 6ps, which is almost a
factor of 3 better compared to our earlier result from 2012. Such an
improvement represents the progress in the development of SiPMs made over these
years and, driven by this progress, an improved knowledge and know-how on such
detectors.
