RHEOGRAPH 25 / 50 / 75 / 120

The RHEOGRAPHES 25, 50, 75 and 120 are newly developed, user-friendly high-pressure capillary rheometers with a further extended shear rate range, higher test load (25, 50, 75 and 120 kN) and a wide range of add-ons and options.

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

The newly developed series of GÖTTFERT high pressure capillary rheometers is available with different test loads of 25, 50, 75 or 120 kN. The stronger versions such as RG75 or RG120 can achieve extremely high shear rates even with very high viscosity test material. Due to a unique and large variety of modular add-ons not otherwise available on the market, other material properties can be tested in addition to viscosity. It is possible to characterize all process-relevant material behaviors.

All high-pressure capillary rheometers of this series are available as single-, twin- or triple-barrel versions with different test barrel diameters. We also offer a large number of capillaries and other options that make it possible to adapt the machine 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 these improvements in the low and high shear rate range, GÖTTFERT is able to distinguish itself considerably from the market standard.

  • Maximum test force of 25, 50, 75 or 120 kN
  • Single-, twin- or triple-barrel system
  • Barrel diameter 9.55, 12, 15, 20, 25 or 30 mm, others on request
  • Dynamic speed range 0.00004 - 40 mm/s (1:1000000)
  • High dynamic acceleration of the test pistion (from 0 to 40 in 0.6 seconds)
  • Piston position measurement with high-resolution encoder
  • 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...



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