It is always stated that cakes formed under centrifugal fields have lower cake permeability than the cakes formed under gas pressure difference, but systematical investigations have not yet been published. Results are reported for two different suspensions from experiments carried out with both techniques under identical suspension conditions. A new standardized analysis method supported by cake flow-through experiments is explained and allows the plotting of all results in the same diagram. For both suspensions, and contrary to the common belief, significantly higher cake permeability values for the laboratory centrifuge tests were determined. Explanations for this behavior are given.