Characteristics for processability and flow behavior

Rheological tests

Plastics exhibit viscoelastic behavior. This means that they exhibit neither properties of an ideal-elastic solid nor of an ideal-viscous liquid. The KUZ test laboratory has available various rheological testing and investigation methods. They are applied to characterize the flow behavior in the shear rate range relevant to processing and also to investigate the quiescent structure of the polymer at very small deformations or deformation rates.

Our services for rheological testing in detail

Test methods

  • Melt Mass Flow Rate / Melt Volume Flow Rate (MFR / MVR)
  • Melt rheology with the plate-plate / cone-plate rheometer ► in rotation or oscillation
  • Dynamic mechanical analysis (DMA) under various loads ► torsional, tensile or flexural loading
  • Solution viscosity (viscosity number - VZ) of various polymers ► PA, PET, PBT, PC, PMMA, PVC (K-value), PLA
  • Online rheology at the injection molding machine

Statements on material behavior

  • Flow behavior of plastics
  • Stiffness and damping behavior
  • Softening, melting, crystallization behavior
  • Temperature positions of relaxation regions (e.g. glass transition temperature)
  • Crosslinking behavior (curing) of elastomeric or duromeric systems
  • Macromolecular degradation and build-up (e.g. post-condensation of PA)
  • Flow behavior of the polymer melt in the injection molding process

Our equipment at a glance

Melt flow rate tester



Solution viscosity

Viscosity measuring system PVS 1


Melt, rotation, oscillation rheometer

MCR 502

Anton Paar

Melt online rheometer

Injection molding rheometer


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Janine Dubiel

Head of Accredited Testing Laboratory