The Benz Melt Flow Index measures the rate of extrusion of molten resins, through a die of specified length and diameter, under prescribed conditions of temperature, load, and piston position in the barrel, as the timed measurement is being made.
  • Melt Flow Index, per ASTM D-1238, measures flow rates of thermoplastics by extrusion plastometer.
  • P.I.D. temperature controller, RTD temperature probe and cast heater insure rapid heatup and stable constant temperature to the test sample.
  • Digital display of setpoint and actual temperature quickly provide correct temperature information.
  • Thermo isolators separate electronic components from heat, providing more consistent test results and less potential for system failure.
  • Metal surfaces are stainless steel or hardcoat aluminum, anodized for durability and ease of cleaning.
  • Built in timer to automatically time test for more accurate results.
  • The unit can be configured for manual operation, per procedure A, or for automatic operation, per procedure B.
  • Optional equipment includes weight application, automatic cutoff, computer system, and different piston cylinder material.
Unit of Measure


Frame Weight

N/A 40 lb18 kg

Frame Depth

N/A 12 in30 cm

Frame Width

N/A 10 in25 cm

Frame Height

N/A 18 in45 cm


Temperature Controllers

N/A P.I.D.

Temperature Probe


Temperature Range

N/A 100 to 350 ºC

Temperature Accuracy

N/A ± 0.2 ºC


Available Weight

N/A 0.325 kg1.0 kg1.05 kg1.2 kg2.16 kg3.8 kg5.0 kg10.0 kg12.5 kg21.6 kg


  • Orifice, piston and cylinder are available in materials other than 52100 steel
  • Automatic extrusion cutting device
  • Automatic weight lifting and application
  • Automatic piston travel transducer
  • Computer for monitoring and controlling the instrument, with MFI program, data storage and reports