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Knowledge – Rheology

Knowledge - Rheology

On this page we offer information on rheological topics in the field of polymers and elastomers.

Polymers

Rg

Knowledge – Rheology – Corrections with the rheometer

Corrections to get true Shear Rate and Shear Stress.
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Moisture

Knowledge – Rheology – MFI – Moisture

Influence of Moisture content for PET in Melt Index Testing
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MFR / MVR
Principle of melt flow index measurement.

Melt Flow Rate

The melt index (melt flow rate) is an important measure of how easily the melt of a thermoplastic polymer flows through a capillary. It is used for quality control and as a simple estimate of the flow behaviour in production.
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IV
GÖTTFERT - IV Tester für die Bestimmung der Grenzviskosität, respektive der intrinsischen Viskosität.

Intrinsic viscosity

With the method described, the intrinsic viscosity (IV) is determined via correlation, without chemical solvents.
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Elastomers

LAOS

Knowledge – Rheology – Large amplitude oscillatory shear

Large Amplitude Oscillatory Shear. Expanded ability to characterize polymers and polymer mixtures with FFT delivers high selectivity.
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Products

Elastomer
The image shows three elastomer testing instruments from GÖTTFERT. The first one is the elastograph (MDR moving die rheometer), the second is a mooney viscosimeter (MV) and the third is a visco-elastograph (VE, or RPA rubber process analyser)

GÖTTFERT – Elastomer testing devices

High quality elastomer testing instruments from GÖTTFERT including mooney viscosimeters, MDR moving die rheometers, RPA rubber process analysers and RCR rubber capillary rheometers.
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Extension

GÖTTFERT – Extensional rheometer

When characterising polymer materials in blow moulding, thermoforming, calendering, coating and spin processes, an extensional rheometer such as the RHEOTENS or HAUL-OFF from GÖTTFERT provides important information.
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Rheograph

GÖTTFERT – Capillary rheometer

Capillary rheometers from GÖTTFERT meeting the highest customer expectations.
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Our Products and Services

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We support our customers in the development of test methods and search for suitable instrumentation.

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Our after-sale service starts with commissioning and continues throughout the entire life cycle.

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We provide on-site instructions, software briefings, telephone support and remote maintenance. For specific topics we and our manufacturers offer seminars and customer-specific on-site training courses.

Modernisation

We evaluate and deliver modernisations with new components, controllers and latest generation software.

Demonstration

We demonstrate Instruments either in our own laboratory, at exhibitions, at other customer's labs or at the supplier's lab.

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