Melt Flow Index of various polymer materials

Melt Flow Index (MFI) is an important parameter for measuring the processability of thermoplastics and is often used to characterize the melt viscosity or fluidity of a polymer. The higher the MFI, the better the material flows and the better it fills the mold.MFI is the mass of polymer melt flowing out per unit of time at a specific load and temperature, usually expressed in grams per 10 minutes (g/10 min).

The MFI range of different polymer materials varies greatly depending on their molecular structure and molecular weight distribution. The following are MFI ranges for some common polymer materials. It should be noted that these values may vary depending on the manufacturer, grade, additives and other factors:

1. Polyethylene (PE)
– Low density polyethylene (LDPE): 0.1 – 30 g/10 min
– High density polyethylene (HDPE): 0.1 – 3 g/10 min

2. polypropylene (PP)
– 1 – 50 g/10 min

3. polystyrene (PS)
– 1 – 25 g/10 min

4. Polyetheretherketone (PEEK)
– 0.1 – 1 g/10 min

5. Polyethylene terephthalate (PET)
– 10 – 80 g/10 min

6. Polycarbonate (PC)
– 5 – 30 g/10 min

7. polymethylmethacrylate (PMMA)
– 1 – 20 g/10 min

8. Polyamide (Nylon, PA)
– PA 6: 10 – 50 g/10 min
– PA 66: 10 – 90 g/10 min

9. ABS plastic
– 1 – 40 g/10 min

10. Polyethylene oxide (POM)
– 1 – 20 g/10 min

MFI measurements are usually performed under standardized conditions such as ISO 1133 and ASTM D1238. The specific test conditions (e.g. temperature and load) depend on the type of material, so it is important to ensure that the test conditions are consistent when comparing MFI values for different materials. For some engineering plastics, different loads may be used to obtain more accurate flow data.

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