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Melt Flow Index (MFI)


Quality control of a thermoplastic batch or determination of the melt flow index (MFI) of the material.

Can be applied to:

plastics, composites


Test method standard:

ISO 1133


Test procedure:

We measure the melt flow index by extrusion of a molten material. The thermoplastic is melted and we use a calibrated dye and a weight determined by the test method standard. The material is extruded and gives an MFI-enabling comparison with a batch or a reference. 

Lead time:

One business day

All tests – composites – metals – plastics – coatings – adhesives – 3D prints

About Sirris Testlabs

Since 1949, Sirris has been helping companies in Belgium to innovate. With our high-tech testing labs and our skilled material experts we want to support the Belgian manufacturing industry in testing and improving its products.

A division of

Accreditation acc to EN ISO 17025






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