As polymer processing and its applications are more and more demanding, the request for accurate numerical simulations is highly present. Accurate predictions using numerical simulation tools are inevitably linked to accurate material data. In the case of rigid PVC processing, one has to deal with two extra difficulties, namely the high sensitivity for slip at the wall during processing and the highly thermal sensitivity of the material. To cope with the high temperature sensitivity, the company ARTechnologies developed the so called Rheoart® using a rotating rod to lower the heating time for the polymer to be measured. Using this equipment using different settings correlating well to real processing conditions, allowed to define an appropriate measurement procedure for rigid PVC. Using this procedure allowed to generate relevant data necessary to extract shear viscosity as function of shear rate applicable for the extrusion process together with the slip at wall as function of the occurring shear stress at wall. Using the appropriate models for the shear viscosity and slip at wall, the results of three commercial software packages are compared which are able to cope with the slip at wall. The results are also compared with the experimental data obtained from the material characterization together with the theoretical result generated with an in house developed software tool for 2,5D modelling of extrusion profiles taking into account slip at wall.