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

ISO 1133, ASTM D1238

Extrusion plastometers provide standard values for the melt index (MFR) and volume index (MVR) of filled and unfilled thermoplastics to ISO 1133, ASTM D1238, and other similar standards.

Name Type Size Download

Method A, MFR

The Cflow extrusion plastometer consists of an extrusion barrel which is heated exactly to a preset temperature, a die of standardized diameter, and a piston with a weight applied to its upper end.

  • The extrusion barrel is filled with the material to be tested.
  • After a defined preheat time, the material is extruded through the die by the force of the applied weight.
  • 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 quantities.

Video of Mflow Extrusion Plastometer

  • The modularly designed Mflow extrusion plastometer for determination of melt mass flow rate (MFR) and melt volume flow rate (MVR) .
  • The Mflow can be operated as a stand-alone instrument via a modern touch display, or with ZwickRoell’s testXpert III testing software.
  • Tests can be performed to the following standards:
    • Methods A and B to ISO 1133
    • Methods A, B and C to ASTM D1238
    • ASTM D 3364
    • JIS K 7210
  • Optionally, you can expand the Mflow with, for example, the pneumatic weight lifting unit, with or without cleaning function, or the weight pegging unit.

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Related Products

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