Viscous flow curves of the lubricating greases studied were
obtained at 25 and 125 °C. Fig. 2 shows the comparison at 25 °C,
which reveals very similar viscosity values, excepting for sample
CH which is more viscous in all the shear rate range studied. Shear
rate range is limited due to the appearance of fracture at high or
moderate shear rates [43–45], which is favoured with grooved
measuring surfaces [46]. Resulting flow curves can be satisfactorily
described by the well-known power-law model: