Melt flow rate
A method-defined measure of thermoplastic flow through an extrusion plastometer under specified test conditions (also called melt mass-flow rate); it is condition-dependent and does not prove that two grades are equivalent.
Also called: MFR, melt mass-flow rate
Material family: Polymers, compounds and processing aids
Where it matters
Resin specification and incoming quality comparison.
Testing and verification
ASTM D1238; reconcile grade identity, moisture where applicable and flow-test conditions before comparing results.
Related guides
Related products and materials
- PFAS-Free Polymer Processing Aids for Polyolefin Film
- Flexible PVC Compounds & Plasticizers
- Engineering Plastic Compounds
- PCR Recycled Resins
Technical references
General information for preliminary evaluation; not independently reviewed or certified. Confirm grades, standards and suitability with the manufacturer for your application. Interpret within the exact material, grade and test method.