Melt mass-flow rate (MFR)

Calculates an MFR, which is an ISO standard measure that describes how easily a given melt flows. The higher the value the more readily it flows.

MFR is identical to the ASTM standard, melt flow index (MFI).

To measure the MFR, the material is first heated in a barrel at a known temperature. Then a known weight is applied to the top of the piston to drive the melt through a capillary die at the end of the barrel. MFR is the mass of the material that passes through the die in a given time interval under the specific conditions of temperature and pressure.

• Temperature The temperature that was used to melt the material for the MFR measurement.
• Load The mass that was applied to push the material through the barrel for the MFR measurement.
• Measured MFR The mass-flow rate of the specific melt. It is measured in grams per 10 minutes (g/10 min), and represents the mass of the melt that passes through the die in 10 minutes.