Reliable Test Results in Melt Flow Testing

Our customers have recurring requirements when it comes to melt flow testing. Topics such as the testing of high flow thermoplastics, increasing efficiency when testing with different weights, or saving space in the lab when multiple instruments are required all play an important role. ZwickRoell offers melt flow indexers that ensure repeatable and reproducible test results for all test methods.

Testing of high flow thermoplastics The Aflow's piston can be stopped completely in the preheating period, making it possible to test liquid polymers even without a die plug. If it is necessary to use the die plug, the Aflow and Mflow offers a die plug option. This prevents material loss in the preheat phase. The die plug is manually positioned and automatically opened by the extrudate cutter at the end of the preheat phase.

Increasing efficiency when testing with different weights Polyethylene manufacturers typically test with 2.16 kg and 21.6 kg. Two separate tests are often needed for this. ZwickRoell's Aflow can combine both tests in one. And testXpert III testing software helps define the multi-stage test. In this way, specimens can be successively tested in one test with different weights and without mechanical adaptation.


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

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