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Frequently Asked Questions
Learn more about Melt Flow Index Testers, polymer testing methods, and industry standards.
A Melt Flow Index Tester is a laboratory instrument used to measure how easily molten plastic flows under heat and pressure. It helps manufacturers evaluate material quality, consistency, and processing behavior in industries like packaging and automotive.
The tester heats plastic material, applies a specific load, and measures how much material flows through a die in 10 minutes. This flow rate (g/10 min) indicates viscosity and processability.
MFI (Melt Flow Index), MFR (Mass Flow Rate), and MVR (Melt Volume Rate) all measure polymer flow. MFR is mass-based (g/10 min), while MVR measures volume flow, both indicating material viscosity.
MFI testing ensures batch consistency, helps detect material degradation, and allows manufacturers to select the right polymer for specific applications.
Industries such as plastic manufacturing, packaging, automotive, pipes, and polymer R&D widely use MFI testers for quality assurance and material comparison.
Calibration depends on usage, but generally it is recommended every 1–2 years, with regular checks using reference materials for accuracy.
Key factors include temperature, applied load, sample preparation, and material filling. Incorrect handling can lead to inaccurate or inconsistent results.
According to industry discussions, MFI provides only basic viscosity insights and may not fully represent real processing conditions like injection molding pressure.
You should consider accuracy, compliance with standards (ISO 1133 / ASTM D1238), automation level, budget, and after-sales support when selecting a tester.
The test follows global standards such as ASTM D1238 and ISO 1133, ensuring consistent measurement of polymer flow properties under controlled conditions.
ISO 9001: 2015 Certified Testing Equipments Manufacturer
Polyplast Equipment & Accessories, a ISO 9001: 2015 Certified manufacturer is in to quality testing equipment for more than 25 years and located in Mumbai. Our clients include Reliance Industries Ltd, Mobile Exxon,ITW, MRF, IOC, Supreme, NeelKamal, Varroce Engineering, Essel Propack etc. Our main product range are includes 3 segments.
