Which standards are related?

Refer to the official standard documents and your laboratory’s accredited procedures for binding requirements.

How should I interpret the results?

Estimate apparent melt viscosity from melt flow index using melt density and an empirical mass-flow correlation. Treat outputs as auxiliary checks; validate against your methods, equipment calibration, and applicable standards.

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

MFI (g/10 min)

Test temperature (°C)

Piston load (kg)

Material (melt density)

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.

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