Melt Flow Index Tester (MFR) is to use a high temperature heating furnace to make the measured object reach a molten state under the specified temperature conditions. The test object in this molten state is subjected to the extrusion test through a small hole of a certain diameter under the specified weight load. In the research of plastic production in industrial enterprises and scientific research units, “melt (mass) flow rate” is often used to represent the physical properties such as fluidity and viscosity of polymer materials in the molten state. The melt flow rate refers to the average mass of each section of the extrudate sample converted to the amount of extrusion in 10 minutes. Melt (mass) flow rate is expressed in MFR in units of: grams per 10 minutes (i.e. g/min)
Melt Flow Index Tester(MFR)
Formula: MFR(θ, mnom)=tref×m/t=600×m/t(g/10min)
In the formula: θ–test temperature
mnom–nominal load Kg
m–the average mass g of the cut
tref–reference time (10min): 600
t–cut off time interval unit: seconds.
Example: A set of plastic samples, cut out a section every 30 seconds, the results of the mass of each section are: 0.081 g, 0.086 g, 0.081 g, 0.089 g, 0.082 g.
Cut off average mass m=(0.081+0.086+0.081+0.089+0.082)÷5=0.0838≈0.084(g)
Substitute into the formula: MFR=600×0.084/30=1.680(g/10min)
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