Estimate apparent melt viscosity from melt flow index using melt density and an empirical mass-flow correlation.
Melt flow index (MFI)
MFI to melt viscosity
Estimate apparent melt viscosity from melt flow index using melt density and an empirical mass-flow correlation.
Inputs
Uses typical mass-flow MFI reporting; η uses the empirical form η ≈ (ρ·6.67×10⁻⁴)/MFI with ρ in g/cm³.
Results
Approx. melt viscosity η (Pa·s)
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Flow category
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Suggested processing (indicative)
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Relates mass-flow MFI to a rough viscosity order-of-magnitude for resin screening. Use capillary or rotational rheometry for process-critical viscosity data.
Applications support
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