Why use the Plastometer / Melt flow index tester? 

The melt flow rate index (MFR) tester is primarily 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. 

The main application reasons:

1, Assessing Material Flowability

The MFR measures the melt mass that flows through a standard die (diameter 2.095mm, length 8.000mm) within 10 minutes, directly reflecting the material's flowability under specific shear conditions. A higher value (e.g., the MFR of LDPE typically ranges from 1-20g/10min) indicates better flowability; conversely, a lower value (e.g., the MFR of HDPE is mostly 0.1-10g/10min) indicates poorer flowability.

2, Quality Control and Production Optimization

In plastic processing, the MFR can serve as a basis for adjusting formulations and optimizing processes. For example, by adjusting temperature, load, or shear rate, material formulations can be quickly screened or processing parameters improved, thereby enhancing production efficiency.

UnitedTest Melt flow index tester conform with standard of: 

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“

Principle:  The melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) are 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.

Feature of MFI402:
LCD display, MFR method, motorized cutting, with micro-printer.
 
Test Procedure:
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;

Data:
Flow rate = ( 600/t x weight of extrudate ) 
t = time of extrudate in seconds
melt flow rate = g/10 min.

Main Specification: 

Other name:
Melt flow index testing equipment; melting flow indexer; melt indexer iso 1133; digital melt flow rate tester; quality melt flow index testing machine; melt flow index astm; plastic Melting Flow Index tester

^{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}