**4. Conclusion**

Good rheological data are necessary for a proper optimization of the production using highly filled polymers and also for good simulations of the related production processes. Since simulation of a production process needs a good virtual model of this process, the correct understanding of the occurring physical effects is vital.

Rheology of highly filled polymers is the tool in place to gain such a deeper understanding. On the other hand, it is essential to have this understanding when measuring reliable rheological data of such materials, which show special and characteristic behavior like yield stress or dependency on the powder loading and shear rate.
