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What is melt flow index Tester?
Melt Flow Iindex Tester. The melt flow index (MFI) is a measure of the ease of flow of the melt of a thermoplastic polymer. It is defined as the weight of polymer in grams flowing in 10 min through a die of specific diameter and length by a pressure applied by a given weight at a given temperature.
Melt flow rate testing procedure:
Every test procedure uses a die with a specified orifice length and diameter, as well as a defined barrel temperature and piston load, which are determined by the ASTM D1238 or ISO 1133 standards.
For testing, the die with the specified size orifice is placed in a heated barrel.
Polymer granules are added and packed into the barrel with a piston.
A defined heating period melts or softens the polymer.
A weight is placed on the piston, and the molten polymer is forced through the die.
The extrusion plastometer calculates the extruded mass per unit of time (MFR) or the distance the piston travels per unit of time (MVR).
At the end of the test, the die and barrel are cleaned.
Our melt flow index testers are designed for simple and precise measuring of the Melt Flow Rate (MFR), also known as Melt Flow Index (MFI) and calculating the Melt Volume Rate (MVR) and pendulum impact.
