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       Material Testing Instruments
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Melt Flow Index

Model Number: SSI 523 MFI

Standard Number: IS: 2530, IS: 10810 (Pt 22), ASTM D 1238

Melt Flow Index (MFI) is a measure of how many grams of a polymer flow through the die in ten minutes. The test is performed at a given temperature depending on the plastic. The force used to push the plastic through the system is supplied by a weight which sits on top of a piston. 


Salient Features
Heating Chamber : Stainless Steel with a cylindrical Flow
Barrel Parameters : Inner Hole 9.55 +/- 0.025 mm
Piston Parameters : Piston Head: 9.475 +/- 0.015 mm
Jet : Length: 8 +/- 0.025 mm : Dia : 2.095 +/- 0.005 mm
Heater : Cylindrical Jacket Type around heater Cylinder for uniform Heating
Temperature Controller         . : Digital PID with RTD PT 100 class A temperature sensor.
Sample Outing : Manual / Motorized.
Weights : Set of weights as per specifications
Calibration : Temperature Controller to be calibrated by NABL Lab.
Packing : One Wooden Box
Delivery : 4 to 6 weeks from date of order.



Instrument Principle

The melt flow index test method is useful for quality control tests on polyethylene having low melt viscosity. The method covers the finding of melt flow index of polyethylene insulation and sheath of electric cables by measuring the rate of extension of polyethylene through an orifice of a specific length and diameter, under prescribed conditions of temperature and pressure. Melt flow index is the fluidity of molten polyethylene expressed as the weight in grams extruded in 10 min through a standard jet under a specific pressure and temperature. The MFI is expressed grams unit.


The instrument conforms to ASTM D 1238, IS: 10810 (Pt 22), IS: 2530,



The Instrument consist of the following

Bullet 1   One hardened steel cylinder.

Bullet 1   Specially designed heaters, for uniform heating throughout the cylinder,

Bullet 1   Temperature controlled by PID temperature indicating controller , within an control accuracy of 0.5 oC

Bullet 1   Mild steel piston, with head of length of 6.35 ± 0.10mm. A stud is attached to support the load.

Bullet 1   The piston is thermally insulated from the load.

Bullet 1   Two weights of 2.16g and 5 kg.

Bullet 1   Two Hardened steel jet: Jet A: 8.000 ± 0.025 mm and internal diameter of 2.095 ± 0.005 mm

Bullet 1   Jet B: Length 8.000 ± 0.025 mm and internal diameter of 1.160 ± 0.005 mm are provided.

Bullet 1   Barrel cleaning device

Bullet 1   Timer

The polymer sample is filled in the per heated barrel and a piston with specified load is applied on the same. As the sample starts to melt it flows through the jet fitted at the bottom of the barrel. The flowing sample is cut every 10 mins and weighed to deter MFI of the polymer. 

Note : Weighing machine is not part of this instrument.