Determination of Melt Mass Flow Rate (MFR) and Melt Volume Flow Rate (MVR)

Extrusion plastometers provide standard values for the melt index (MFR) and the volume index (MVR) of filled and unfilled thermoplastics to ISO 1133, ASTM D 1238 and similar Standards.

Zwick produces straightforward extrusion plastometers for Method A and instruments with automatic displacement measurement which can be used for measurements to Methods A and B.

Method A

The Cflow extrusion plastometer consists of an extrusion barrel which is heated exactly to a pre-set temperature, a die of standardized diameter and a piston with a weight applied to its upper end. The material to be tested is loaded into the extrusion barrel; after a specified pre-heating period it is extruded through the die by the force of the weight acting on the piston. The extrudate is cut off at constant time-intervals and weighed. The result is the melt mass flow rate (MFR), which is calculated from the extruded mass per 10 minutes.

This method is suitable for individual tests with lower specimen flow.

Typical Products for this Application:

Cflow Extrusion Plastometers

The easy-to-use Cflow extrusion plastometers have been designed as a stand-alone instrument. They are specifically intended for MFR determination and are suitable for goods inwards checks.

Mflow Extrusion Plastometers

The basic versions of the Mflow extrusion plastometers are used to determine the melt mass flow rate (MFR). Use of the displacement transucer expands their function to include determination of melt volume flow rate (MVR) and automatic adaptive parameter configuration. Typical uses are in quality control and goods inwards.

Zwick 4106 Extrusion Plastometers

Zwick 4106 Extrusion Plastometers are the ideal solution for raw-material manufacturers and for use in research and development. Typical applications include tests to DIN EN 1133, ASTM D 1238 and other comparable tests on filled and unfilled thermoplastic polymers.

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