How does a melt flow index tester determine the flow properties of thermoplastic materials?
A melt flow index (MFI) tester determines the flow properties of thermoplastic materials by measuring the rate at which the material flows through a specified die under controlled temperature and pressure conditions. During the test, a pre-weighed sample of the thermoplastic is heated to a standard temperature, then extruded through the die by a piston under a defined load. The amount of material that flows out in a given time (typically 10 minutes) is measured, providing the MFI value. This value indicates the material's viscosity and flowability, which are crucial for processing and quality control in manufacturing.
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