Mflow extrusion plastometer

The basic version of the Mflow extrusion plastometers can be used to determine the melt mass flow rate (MFR). The plastometer features modular design; using the piston transducer expands Mflow's capabilities to include determination of melt volume flow rate (MVR), plus automatic adaptive parameter configuration. Typical uses are in quality assurance and goods inwards checks.

Key advantages and features

Reliable test results

A precision piston transducer ensures accurate measurement of piston stroke when determining MVR. The contact point is very close to the piston, minimizing possible angle errors from the outset. The accuracy with which the flow rate is determined in Method B depends on the synchronization of the time-travel data pairs and on the accuracy of the time determination. As both measured quantities (time and travel) are available in digital form from the outset, there is no need for analog to digital conversion. This also eliminates synchronization errors. Quartz accurate time measurement also enables measurement of materials with high flow-rates.

Description of application

As the volume of testing increases, so does the need for a greater degree of automation (compared to Cflow). Mflow is capable of modular expansion and can be used to determine melt mass flow rate and melt volume flow rate.

  • The basic version of the Mflow extrusion plastometer is designed to perform MFR tests in accordance with Method A and can be upgraded for MVR tests as per Method B. Tests to the following standards are possible:
  • Methods A and B, ISO 1133
  • Methods A, B and C, ASTM D1238
  • ASTM D3364
  • JIS K 7210

You can optionally upgrade Mflow, for example by adding the pneumatic weight-lifting unit with or without cleaning function, or the weight selector.

Mflow can be operated in stand-alone mode via a modern touch display or on a PC with ZwickRoell testing software.


Simplified cleaning, with rapid expulsion of residual specimen material

The die plug is located on the underside of the extrusion barrel. Removing the die plug frees the die to move downwards, allowing it to be removed easily. Expelling the die plus residual material after the test is similarly quick and easy. Cleaning is simplified because the barrel is now accessible throughout. The Pneumatic Weight-lifting with Cleaning Function option also enables simple, convenient cleaning of the extrusion barrel at the touch of a button.

Operating philosophy

The new standardized operating philosophy allows the operator to move easily between instrument and PC and always feel at home.

All test-related settings are grouped logically and are separated from higher-level system settings. The operator is guided through test configuration step by step. The saved test configuration can easily be exported and transferred to other instruments.

Integrated user management allows the operator's input options to be reduced to a minimum. Users see only what is important to them, allowing them to focus on the task at hand right from the start.

The MVR is shown "live" in graphic form in stand-alone mode and in the ZwickRoell testing software. This allows both melting process and behavior to be followed precisely during measurement.

Saving space when testing with multiple instruments

In labs with multiple instruments, testXpert III makes it possible to configure and control up to six Aflow and/or Mflow extrusion plastometers with one PC. Central operation and saving of results at a single workplace increases efficiency and affords a quick overview of all tests currently in progress. For a clear overview of operations, we recommend using two monitors.

The benefits of operating an extrusion plastometer with testXpert III are:

  • Automatic bubble detection that prevents measurement errors caused by air inclusions by detecting them in the plastic melt
  • Live display of the melt volume rate that follows the progress of melting and the behavior during measurement and graphically or numerically displays the test piston speed when the test starts in cm³ per 10 min. or in g per 10 min. when the melt density is preselected

Mflow extrusion plastometer with weight selector

The Mflow weight-selector option combines the advantages of pneumatic weight-lifting with the convenience of simple, safe and reliable changing of test weights, ensuring secure weight-storage and an operator-friendly test sequence.


Mflow extrusion plastometer in all models

The modular Mflow extrusion plastometer is used to determine the melt flow rate (MFR) and volume flow rate (MVR).

Additional information on the weight selector

Pneumatic weight lifting unit

  • The Mflow extrusion plastometer can be fitted with test weights according to the plastic in use.
  • To ease the load on the operator, the weights can be raised and lowered by a pneumatic weight-lifting unit with no physical effort required.
  • The test weight can automatically be raised by the weight-lifting unit when the pre-heating position has been reached.
  • This minimizes any premature flow of the plastic granulate during the preheating period.
  • If test weights with test loads of, for example, 2.16 kg, 5 kg, 10 kg or 21.6 kg are used with Mflow, we recommend use of the pneumatic weight-lifting unit or the weight selector.

Weight selector

  • The weight selector contains the pneumatic weight-lifting unit plus the test weights listed below.
  • If test weights are changed frequently we recommend use of the weight selector.
  • The piston-holding device retains the piston in a freely definable position during the preheating phase.

Technical overview

The basic version of the Mflow extrusion plastometer is designed to perform MFR tests in accordance with Method A and can be expanded for MVR tests as per Method B. Tests to the following standards are possible: Methods A and B as per ISO 1133, ASTM D1238, ASTM D3364, JIS K 7210.

Technical data for Mflow extrusion plastometer

Suitable accessories

Test weights

Test weights

Cflow and Mflow can be fitted with the following weights according to the plastic in use. They cannot be used for the pneumatic weight-lifting unit with selector.

Test load

Required for this:

Item no.























weights with 5/10kg test loads (Item No. 001381)


(ASTM D3364) 20

weights with 5/10/15/21.6 kg test loads (Item No. 001443)


Extrusion barrels

Extrusion barrels (1 x required)

At least one extrusion barrel must be selected, in accordance with the materials to be tested. Various plastics (e.g. PTFE and PFA) which contain fluorine release hydrofluoric acid, which attacks the extrusion barrel material. For these plastics extrusion barrels made of a special steel alloy are used. These extrusion barrels have only limited suitability for filled plastics. For these the wear-resistant version is recommended.

Test material

Inner diameter

Drill hole


Item No.

Plastic, fluorine free


Finely honed

Wear resistant


Plastic, containing fluorine


Finely honed

Resistant to acid


Extrudate cutter

Extrudate cutter and die plug

The manual extrudate cutter is recommended for cutting intervals greater than one minute. For short cutting intervals use of the automatic extrudate cutter is recommended in order to obtain precisely timed cuts. The die plug prevents premature outflow of the material when plastics with high flow-rates (>  10 cm3/10 min at load 0.375 kg) are being tested. When the die plug is used an extrudate cutter is required in order to eject the die plug automatically when the test begins.