Mass of a polymer in grams that flows through a calibrated orifice at constant temperature under a specified load over a
\(\pu{10\!{-}min}\) period.
Notes: - There is no suitable SI unit for MFI.
- Specified loads are mandated for specific polymers.
- The values of MFI as a function of load can give information on the molar mass distribution.
- Standard procedures for determining MFI are available from ISO and ASTM.
Source: PAC, 2013,
85, 1017. (
Glossary of terms relating to thermal and thermomechanical properties of polymers (IUPAC Recommendations 2013)) on page 1033 [
Terms] [
Paper]