What is a Melt Flow Index Tester? The Melt Flow Index Tester is a device used to measure the flow rate of melted plastic material. This measurement, known as the Melt Flow Index (MFI), indicates the ease of flow of the polymer melt. The MFI is a critical parameter that helps in assessing the quality, viscosity, and processing behavior of thermoplastic materials. Importance of Melt Flow Index in...