The RHEOGRAPH 20 is the perfect entry-level model for viscosity measurements. Add-ons, which can be attached to the testing device in a modular way, enable the measurement of additional material properties.

  • ASTM D3835 (Viscosity)
  • ISO 17744 (PVT)
  • ASTM D5930 (TCM)
  • ASTM D5099 (Rubber)
  • ISO 11443 (Viscosity)

The entry model of the newly developed high-pressure capillary-rheometer series from GÖTTFERT is a rheometer with a test load of 20 kN. In addition to viscosity measurements according to ISO 11443, the RHEOGRAPH 20, or RG20 for short, can also be used to determine other material properties by means of various add-ons. The RG20 is available as one or two-barrel version with different barrel diameters. We also offer a wide range of capillaries and additional options that make it possible to adapt the device perfectly to your application.

An essential improvement of this series compared to the previous generation is the much more accurate pressure measurement. This makes it possible to significantly increase the reproducibility and precision of the test results. Especially the extremely low pressures at very low shear rates can be measured perfectly now.

Due to this improvements GÖTTFERT lifted the market standard to a higher level. 

  • Maximum test force of 20 kN and up to 2500 bar pressure
  • One- or two-barrel system with diameter 9.55, 12, 15 or 20 mm
  • Dynamic speed from 0.0001 mm/s (0.006 mm/min) – 30 mm/s (1800 mm/min)
  • Piston position measurement with high-resolution encoder (0.000053 mm)
  • Adaptive signal resolution of only 0.005 % from the pressure transducer range
  • Integrated tempering jacket
  • Temperature up to 400°C (500°C optional) 
  • Alternative steel grades for barrel and piston with higher corrosion or abrasion resistance
  • Optional: Isothermal or isobaric PVT-measurements
  • Optional: Innovative air-cooling system, cooling rate max. 30 K/min
  • PVT Measurement (Pressure, Volume, Temperature) according to ISO 17744
  • Elongation (Haul-Off, Rheotens)
  • Contifeed
  • Shark-Skin
  • Thermal Conductivity Measurement according to ASTM D5930
  • Counter-Pressure-Chamber
  • Die-Swell Measurement

PVT isobaric

This procedure is standardized in ISO 17744 for piston operated instruments. Isobaric PVT measurements are performed at constant pressure...


PVT isothermal

In isothermal PVT measurement, the measurement process starts at room temperature after the material is filled at melt temperature and...


Bagley Correction

The Bagley correction is needed to calculate the inlet pressure drop when round hole capillaries...



Weißenberg-Rabinowitsch Correction

Due to shear thinning of polymer melts with pseudoplastic flow behaviour a strong flection of the...



Thermo Stability

Plastics have the property of aging through thermal or mechanical stress...



Melt Elasticity/Strength

The melt strength (elasticity) is determined by withdrawing an extruded strand of capillary rheometer...



Counterpressure chamber

The counter pressure chamber, which offered by GÖTTFERT as an optional Add-on ...



Flow Instabilities (Shark-Skin)

The Shark-Skin effect occurs during the extrusion of plastics, elastomers or food and manifests...



Thermal Conductivity

The measurement of the thermal conductivity is carried out by means of a probe...



Extensional viscosity (Cogswell Modell)

The extensional viscosity can be calculated with measured data of a capillary rheometer...



Die Swell Measurement

The Die Swell measurement is one of many available add-ons for the series of GOETTFERT capillary rheometers...



More Products an Service

Enquiry Service