The RG auto is a semi-automated capillary rheometer which supports the operator with a high number of viscosity measurements in low and high shear rate range by automation of filling, measuring and cleaning. The tester is particularly used in the quality assurance of polymers.

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

The semi-automated capillary rheometer enables the user to carry out automated viscosity measurements. The main automation modules focus on barrel cleaning, capillary closing as well as capillary pre-cleaining.

Furthermore, we offer external cleaning modules for the rheological tester, such as plunger cleaning. Optionally, the capillary rheometer can be equipped with 25kN or 50kN test force and configured between the single-channel systems with a diameter of 9.5mm or 12mm.

Technical specifications
  • Maximum test force of 25, 50kN
  • Single barrel system with 9.5mm or 12mm
  • Dynamic speed range 0.00004 - 40 mm/s (1:1000000)
  • Adaptive signal resolution of only 0.005 % from the pressure transducer range
  • Temperature up to 400°C (500°C optional)
  • Alternative steel grades for barrel and piston with higher corrosion or abrasion resistance
  • Integrated Cleaning Modules: Sewer cleaning, nozzle sealing, nozzle pre-cleaning
  • External Module: Piston Cleaning Tool

Add-Ons for advanced material characterization

The basic instrument of GÖTTFERT capillary rheometers is designed to carry out viscosity measurements with plastics, rubbers and a variety of other materials. By using modular Add-Ons additional characterization possibilities can be used.

The measuring head is mounted below the die. The measurement can be carried out parallel to a viscosity measurement.

  • Determination of the dynamic and static die swell
  • Evaluation of a die swell profile (BASELL method)
  • Swivel arm with continuous height adjustment
  • Laser measuring head in 0.1 μm or 7 μm version
  • Optional with automatic melt cutting device
  • Optional: acquisition of two strings simultaneously
  • Application: Simulation of material swelling behaviour during extrusion



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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