Such a cutter stock could typically have a viscosity at 100 C of 1.3 centistokes.

It is sometimes expressed in terms of centistokes (cSt).

One can convert efflux time to kinematic viscosity by using an equation for each cup specification number, where t is the efflux time and ν is the kinematic viscosity in centistokes.

The differences between the two are mainly the density and viscosity, with RMG generally being delivered at 380 centistokes or less, and RMK at 700 centistokes or less.

A marketable fuel oil, such as for fueling a power station, might be required to have a viscosity of 40 centistokes at 100 C. It might be prepared using either the virgin or visbroken residue described above combined with a distillate diluent ("cutter stock").