The Extrusion That Proves Your Resin Moulds the Way You Expect

A resin that mechanically tests perfectly can still jam a moulding line, short-fill a cavity, or produce parts that vary batch to batch if its melt behaviour has quietly drifted.

Melt Flow Rate Testing answers the question a finished-part mechanical test never can: how easily a thermoplastic actually flows once it’s heated and pushed through a die, which is exactly the behaviour that decides whether a moulding or extrusion run goes smoothly or jams the line. Our melt flow programme at the Oragadam laboratory heats a resin sample to a specified temperature inside a calibrated extrusion plastometer and pushes it through a standard die under a fixed weight, recording how much material extrudes in a set time, referenced to ASTM D1238 and ISO 1133 — the two governing standards for melt flow rate of thermoplastics used across resin qualification, incoming material inspection, and moulding compound release testing.

Melt flow rate testing for plastics reports two related but distinct numbers depending on which output is measured. Melt Flow Rate, expressed in grams per 10 minutes, weighs the actual extruded material, while Melt Volume Rate measures the extruded volume instead, a figure that stays independent of any density variation between resin lots and is often the more meaningful number when comparing materials with different fillers or additive packages. Flow rate ratio takes that measurement a step further, running the test at two different loads to characterize how sensitive the resin’s viscosity is to shear rate — information that matters enormously once a material moves from a lab-scale test into a high-shear injection moulding process.

ASTM D1238 testing defines the temperature, load, die geometry, and timing procedure used across the US medical device and plastics industry, while ISO 1133 testing sets the equivalent internationally recognized method, and running both on the same resin batch lets a single test report satisfy FDA submissions and CE-marked device files together. Melt density, calculated from the ratio between MFR and MVR results, gives a design team an additional cross-check on resin consistency without a separate test. Manufacturers rely on our melt flow index testing for medical device resin qualification because a single missed reading doesn’t surface as a data-sheet footnote — it surfaces as a short-shot part, a jammed extruder, or an incoming resin lot that behaves nothing like the one it’s meant to replace. Running the full melt flow panel under one accredited scope at Oragadam, with reports formatted for direct regulatory submission, is what turns a raw plastometer reading into evidence your quality team can actually stand behind.

Kiyo R&D Lab – Oragadam

Our melt flow index testing for medical device resin qualification suite is based at No.13, Srinivasa Perumal Street, Panapakkam, Serapanacheri, Greater Chennai, Tamil Nadu 601301.

Book Your Melt Flow Test Today

Talk to our Oragadam team about your resin, pellet, or moulding compound — melt flow index testing for medical device resin qualification, run on the same sample as your tensile, flexural, or impact programme.

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