Knowledge - Rheology
On this page we offer information on rheological topics in the field of polymers and elastomers.
Frequently asked questions and answers
The MFI melt flow index tester is a testing machine that allows the melt flow index to be determined in accordance with the ISO 1133 and ASTM D1238 standards. A capillary rheometer is used, for example, for tests in accordance with the ISO 17744 and ASTM D3835 standards. Depending on the equipment, it can also be used for testing according to other standards.
MFI devices tend to be used for incoming goods inspection and quality assurance, while capillary rheometers are also used in the scientific field.
In melt index testers, a polymer granulate is typically heated in a metal cylinder and pressed through a nozzle at the end of the channel using a plunger. The plunger is loaded by defined weights. The amount of material that flows through the nozzle in a certain time is a measure of the viscosity.
In capillary rheometers, the plunger is loaded by an electric drive. The force applied is measured using a load cell. This technology makes it possible to generate greater forces and therefore higher punch speeds, such as those that occur in the extrusion production process.
Polymers
Knowledge – Rheology – Corrections with the rheometer
Knowledge – Rheology – MFI – Moisture
Melt Flow Rate
Intrinsic viscosity
Elastomers
Knowledge – Rheology – Large amplitude oscillatory shear
Products
GÖTTFERT – Capillary rheometer
GÖTTFERT – Melt index testers
GÖTTFERT – Extensional rheometer
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Modernisation
We evaluate and realise modernisations with new components, controllers and software of the newest generation.
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