The Melt Flow Index (MFI) is a measure of the flow characteristics of a thermoplastic polymer when it is melted. It quantifies the ease of flow of the molten polymer through a standard die under a specific temperature and load. The MFI is typically expressed in grams per 10 minutes (g/10 min) and is determined using a standardized test method, often specified by organizations such as ASTM (American Society for Testing and Materials) or ISO (International Organization for Standardization).
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