Melt Flow Index, often referred to as MFI or MFR (Melt Flow Rate), is a measure of the ease with which a molten thermoplastic material flows under prescribed conditions of temperature and pressure. It quantifies the flowability of a polymer by determining the mass of polymer extruded in a specified time interval through a standardized orifice at a constant temperature and pressure. This parameter serves as a crucial indicator of a material’s processability, viscosity, and molecular weight distribution.
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