Melt Flow Rate Tester

The Melt Flow Rate Tester is designed to assess the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastic materials under controlled temperature and load conditions.

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Application

The Melt Flow Rate Tester is designed to assess the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastic materials under controlled temperature and load conditions. It employs two methods: the mass-measurement method and the displacement-measurement method. This tester is suitable for high-temperature engineering plastics such as polyethylene, polyarylsulfone, fluoroplastics, and nylon. It can also be utilized for lower melting point plastics, including polyethylene, polystyrene, polypropylene, ABS resin, and polyoxymethylene resin.

Test Principle

The determination of MFR and MVR involves extruding molten material through a specified die length and diameter from the cylinder of a plastometer at set temperature and load conditions. In the MFR measurement (Procedure A), segments of the extrudate are timed and weighed to calculate the extrusion rate in grams per 10 minutes. For MVR measurement (Procedure B), the movement of the piston over a set time or the time taken for the piston to travel a defined distance is recorded, enabling the calculation of the extrusion rate in cubic centimeters per 10 minutes. If the melt density at the testing temperature is known, MVR can be converted to MFR, or vice versa.

Standards

The Melt Flow Rate Tester complies with several standards, including ISO 1133-2, ISO 1133-1, ASTM D1238, GBT 3682.1, GBT 3682.2, GB/T18742, and JB/T 5456.

Definition

Melt Mass-Flow Rate (MFR)
MFR refers to the rate at which molten resin is extruded through a die of specific dimensions under defined temperature, load, and piston positioning conditions within the extrusion plastometer. It is measured as the mass extruded over a specified time frame and is expressed in grams per 10 minutes. In SI units, it can also be represented as decigrams per minute, where 1 g/10 min equals 1 dg/min.

Melt Volume-Flow Rate (MVR)
MVR denotes the rate at which molten resin flows through a die of particular length and diameter under specific temperature, load, and piston positioning conditions. This rate is calculated based on the volume extruded over a given time and is expressed in cubic centimeters per 10 minutes.

Understanding "Load" in MFR and MVR Testing
In the context of MFR and MVR testing, "load" refers to the total force applied, which includes the weight of the piston and any additional weights specified for the test conditions.

Common Nominal Loads

Typical nominal loads used during testing are 0.325 kg, 1.200 kg, 2.160 kg, 3.800 kg, 5.000 kg, 10.000 kg, and 21.600 kg.