Process Control Rheometer

The Thermo Scientific HAAKE PCR 620 is a twin-pump bypass rheometer that provides online rheological measurements of melt index and viscosity in polymer processing. With more than 200 installations around the world, the HAAKE PCR helps to improve our customers’ product quality.


The Thermo Scientific HAAKE PCR 620 (Process Control Rheometer) measures the melt index at standard ASTM loads or at higher loads (with back-calculation to standard load) in order to reduce lag time. The patented, slit die pressure-control feature allows the HAAKE PCR 620 to operate at pressures above the process pressure, thereby ensuring operation in the linear region of the transducers and preventing out-gassing. This also allows the HAAKE PCR 620 to cover a wide melt index range and follow transitions with a single die eliminating costly and troublesome die changes common to other systems. The HAAKE PCR 620 can operate in a variety of modes: melt index mode, transition melt index mode, purge mode, viscosity mode (stress or rate control) and combinations of those.

The Thermo Scientific HAAKE PCR 620 can also report a synthesized Mooney or Intrinsic Viscosity (IV) value – a mathematical calculation from measured shear viscosity data. For ease of operation, recipes consisting of operating parameters and control values can be stored for various product grades. The HAAKE PCR 620 logs all data and events in a database for trend analysis, SPC reporting and data storage.


  • Online melt index measurement
  • Online viscosity measurement


  • Polypropylene (PP)
  • Polyethylene (LDPE/HDPE/LLDPE)
  • Polyester (PET)
  • Ethylene Vinyl Acetate (EVA)
  • Polymethyl-methacrylate (PMMA)
  • Polystyrene (PS)
  • Polyamide / Nylon (PA)
  • Polycarbonate (PC)


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