The “Melt Flow Index” (MFI) of plastic refers to the weight (in grams) of molten plastic that flows through a standardized tube with a specific diameter under a defined load (in kilograms) and temperature (in °C) within a set period of time (typically 10 minutes). A higher MI value indicates better plastic flowability, while a lower MI value suggests poorer flowability. This concept is similar to comparing clear broth and thick soup in the same type of container: when you open the valve, the amount of liquid flowing out within the same period will differ, as clear broth flows more easily than thick soup. Essentially, the thicker the liquid, the less it will flow out.
MFI: Melt Flow Index
MI: Melt Index
MFR: Melt Flow Rate