Rheology

Gemini research rheometer

The Gemini rheometer features Malvern's patent pending Rotonetic, an adaptive control technology which is optimised for both strain and stress controlled operation. The broad torque range extends to 200mNm making the Gemini suitable for a wide range of applications. A new high resolution torque mapping system and the inherently low bias air bearing technology allow low torques to be set extremely accurately.

The Gemini is available with a full range of temperature controllers which include peltier devices, a forced gas oven with optional liquid nitrogen cooling, electrical heating and a range of liquid circulators. This allows testing on a full range of materials including polymer melts, composites, fluids and semi-solids.

The Rotonetic drive enables testing in all conventional strain and stress controlled modes including stress relaxation, creep and viscometric modes. Oscillation testing is available in either direct strain or stress controlled modes. Direct strain operation of oscillation allows preset strain amplitudes to be imposed upon the test sample without iteratively adjusting the stress on a cycle-by-cycle basis. A new feature, partial wave sampling, also enables rheological data to be gathered using just part of a full oscillation cycle. When used in conjunction with direct strain control, partial wave sampling makes low frequency testing far less time consuming and more practical.

Gemini - accurate testing for a wide range of materials.

Visco 88 viscometer

The Bohlin Visco 88 Viscometer is easy to use and provides accurate viscosity measurements at single or multiple shear rates.

The design facilitates a wide measuring range from low viscosity fluids through to viscous pastes. It's ideal for routine QC testing , although the large measuring range also makes it suitable for basic development applications. The Visco 88 is supplied with a rechargeable battery unit so that it is completely portable for measurements in the field or in the production area.

The Visco 88 viscometer is supplied as a stand alone unit with three DIN concentric cylinder measuring systems. It can be easily interchanged as a cone and plate system, and using the Viscosoft software can be controlled from a computer.

Visco 88 - easy to use and portable

DSRII Asphalt rheometer

This world renowned Bohlin asphalt rheometer is the industry standard dynamic shear rheometer for SHRP and AASHTO asphalt testing.

Developed in close cooperation with SHRP researchers, this asphalt rheometer offers precise and accurate unattended operation. It has been designed to minimize the time required to make each measurement according to AASHTO TP5.

Temperature Control - Bohlin's pioneering design
Bituminous materials are extremely temperature sensitive. Small temperature gradients in the sample and errors between the sensor temperature and the mean sample temperature can render rheological data unreliable.

To overcome this problem, the Bohlin DSRII uses a patented system which completely immerses the sample in a temperature controlled fluid, complying fully with the SHRP testing protocol.

Gap Setting - Simple and thermally stable
The gap can easily be changed to any required value and does not require continual resetting, thus optimising sample throughput and eliminating operator error. There is a choice of mechanical or air bearing

Software - Routine and Research
The standard Windows software is easy to use for specification and grade determination testing. Optional research software is available for expansion into a full research grade unit.

The following tests are available:

• Oscillation as a function of time, temperature, frequency and shear stress.
• Viscosity as a function of shear rate, shear stress, temperature and time.
• Creep and Creep Recovery (for compliance measurement and analysis).
• Time Temperature Superposition and Viscoelastic Analysis.

Asphalt rheometer - the industry standard

RH2000 Capillary rheometer

The RH2000 bench top capillary rheometers are compact and provide most of the testing requirements of capillary rheometry. They are available in both single bore or twin bore configurations and incorporate many of the features of floor standing models. A new digital drive system gives excellent performance in terms of speed control, accuracy and dynamic operating range. This new hardware is supported by the latest generation of 32 bit Windows™ based software with many new experimental possibilities.

Capillary rheometer - a versatile compact bench top unit

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