MFI & MVI

Melt Flow Index

Using the MF30, the Melt Flow Index (MFI) of a material can be determined. The MFI, also known as melt flow rate (MFR), indicates the degree of viscosity of the material. The MFI is an important characteristic for the processing of plastics. In certain processing techniques, a high MFI is preferred, whereas in other processing techniques, materials with a low MFI are preferred.

The MFI is determined by allowing the material to flow through a channel-like space (capillary) at a specific temperature and pressure. The MFI depends on the rate at which the material flows out of the capillary, and it is calculated in grams per 10 minutes. A less viscous material will flow quickly out of the capillary and therefore has a high MFI. The opposite is true for a very viscous material, which flows more slowly out of the capillary and consequently has a low MFI.

Melt Volume Rate

The melt volume rate (MVR) is determined based on the melt density of a material. Subsequently, the volume per unit of time that is extruded through the capillary is measured. The results are presented in cm³ per 10 minutes. The MFI is typically conducted according to ISO 1133.

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