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Melt flow index tester ASTM D1238

Melt flow index tester ASTM D1238

Model: MFI403, Plastometer ISO 1133, ASTM D1238

MFI403 Melt flow index tester is for melt mass-flow rate (MFR) and the melt volume-flow rate (MVR), determined by extruding molten material from the cylinder of a plastometer through a die of specified length and diameter under preset conditions of temperature and load. Used to measure the melt mass flow rate of thermoplastic plastics under specific temperatures and pressures, reflecting the flow performance of materials through standardized testing. 


Feature of MFI403:

Large LCD display;  both MFR/MVR test method; both manual and motorized cutting; with micro-printer. 

General introduction

MFI403 Plastic Melt Flow Index Meter is for melt mass-flow rate (MFR) and the melt volume-flow rate (MVR), determined by extruding molten material from the cylinder of a plastometer through a die of specified length and diameter under preset conditions of temperature and load. Used to measure the melt mass flow rate of thermoplastic plastics under specific temperatures and pressures, reflecting the flow performance of materials through standardized testing. 


Feature of MFI403:

Large LCD display;  both MFR/MVR test method; both manual and motorized cutting; with micro-printer. 


Melt flow index tester ASTM D1238
The die and half-size die


Main Features

  • Key feature
  • Test Procedure
  • Standard
  • Why Melt Flow Rate Is important to Polymer?

Mainframe is desk-top model, with beautiful appearance and stable performance, high accuracy, easy to use.

With high sampling, and high control rate.

With Micro-printer to print test result.

MFR and MVR method to meet most kinds materials.

Manual and motorized both way cutting sample. 

Approximately 7 grams of the material is loaded into the barrel of the melt flow apparatus, which has been heated to a temperature specified for the material. A weight specified for the material is applied to a plunger and the molten material is forced through the die. A timed extrudate is collected and weighed. Melt flow rate values are calculated in g/10 min. 


Specimen size:

At least 14 grams of material;


Test Data:

Flow rate = ( 600/t x weight of extrudate ) 

t = time of extrudate in seconds

melt flow rate = g/10 min.

ISO 1133  Plastics - Determination of the Melt Mass-Flow Rate (MFR) and Melt Volume-Flow Rate (MVR) of Thermoplastics

ASTM D1238  Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer


ASTM D3364 (for PVC), BS 2782, DIN 53735, JIS K7210

Melt flow rate plays an important role in plastic processing and product molding. 

It helps with quality control. Manufacturers use MFR to check the consistency of each batch of plastic. If the melt flow rate suddenly changes from one batch to another, it could indicate a problem, such as a material change or processing error. Detecting issues early can prevent bigger problems.


It also guides material selection. Different manufacturing methods require plastics with different flow properties. For example, injection molding is generally better suited to high MFR materials because they can flow quickly into complex molds. On the other hand, extrusion or blow molding may require plastics with low MFR to better control the flow.


MFR also affects the strength of the final product. In general, a low MFR means the plastic has a higher molecular weight, which can result in better mechanical strength and durability. High MFR makes plastics easier to process but may involve a trade-off in strength.

Main technical specification


ModelMFI403
(XNR-400B)
Temperature rangeAmbient temperature to 450℃ stepless adjustable, fixed point temperature control
Temperature fluctuation±0.5℃
Temperature resolution0.1℃
Weight8 levels, total 21.6kg mass
Measuring method & rangeMFR (0.1-350)g/10min
MVR(0.1-350) cm3/10min
Heating power450W
Extruding part spec. :
(1), Inner diameter of dieφ2.095±0.005mm
(2), Length of die8.000±0.025mm
(3), Inner diameter of filling canisterΦ9.550±0.025mm
WeightFrame: 30kg
Standard weights: 25kg
Power220V, 50HZ/110V, 60HZ
DisplayLCD display temperature, time, sampling number etc.
Micro-printerYES
Specimen cutting modeAutomatic & Manual both mode


Main Accessories

ItemQuantity
Frame1 set
Die (φ2.095) tungsten carbide material1 pc
No. 1 weight (piston rod + weight tray):  325g1 pc
No. 2 weight: 875g1 pc
No. 3 weight: 1835g1 pc
No. 4 weight: 3475g1 pc
No. 5 weight: 4675g1 pc
No. 6 weight: 5000g1 pc
No. 7 weight: 2500g1 pc
No. 8 weight: 2915g1 pc
Scraper1 pc
Sample loading hopper1 pc
Water level1 pc
Die cleaning rod1 pc
Cylinder cleaning rod1 pc
Sample loading rod1 pc
Sample plate1 pc
Electric wire1 pc
Cleaning gauze and gloves1 pc
Accessories containing case1 pc
Documents (Manual, packing list, certificate)


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