The Melt Flow Index (MFI) is a measure of the ease of flow of the melt of a thermoplastic polymer. A higher MFI value indicates a lower material viscosity, and when comparing polymer materials of the same class and grades, a lower melt flow MFI rate indicates a higher molecular weight that maybe with or without less branching links. Melt flow rate is a measure of the ability of the polymer material to flow under pressure and temperature. Molecular weight provides performance in polymeric materials, the higher the molecular weight, the better the performance. MFI can be used as an important parameter for quality certification and batch to batch quality comparison.
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