Definition, Function and Instrument of MFI Test

 

What is a MFI test?

Melt flow index, is a value that indicates the fluidity of plastic materials during processing. The MFI test method is: first, let the plastic pellets melt into plastic fluid within a certain time (10 minutes), at a certain temperature and pressure (different standards for various materials), and then measure the grams (g) of plastic that flows out through a 2.1mm diameter tube. The larger the value, the better the processing fluidity of the plastic material, and vice versa.

Standards related to MFI test

ASTM D-1238: Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer
ISO 1133: Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics
GB 3682-83: Test method for melt flow rate of thermoplastics
JIS K7210: Plastics – Determination of The Melt Mass-flow Rate (MFR) And Melt Volume-flow Rate (MVR) Of Thermoplastics – Part 1: Standard Method
DIN 53735: Testing of Plastics: Determination of The Melt Flow Index of Thermoplastics
BS 2782: Methods of testing plastic – Introduction

Introduction to two measurement methods of melt index tester

Melt index tester is an essential testing instrument for plastic processing enterprises. Commonly used testing methods are melt mass flow rate (abbreviated as mass method or MFR) and melt volume flow rate (abbreviated as volume method or MVR). The following is an explanation of these two MFI test formulas:
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