ISO 1133 Melt Flow Rate (MFR) Testing for Thermoplastics
ISO 1133 is a standard that specifies a method for measuring the melt flow rate (MFR) and melt volume rate (MVR) of thermoplastics. These values are important indicators of a material's viscosity, which is a measure of its ability to flow under certain conditions.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
ISO 1133 Melt Flow Index (MFI) Overview
ISO 1133 is a standardized procedure for testing the melting and flow behavior of thermoplastics under specific temperature and loading conditions. The test can be used to determine either the Melt Flow Rate (MFR), which is the mass of the polymer melted and flowed per unit time, or the Melt Volume-Flow Rate (MVR), which is the volume flowed per unit time.
This is an important test because it can determine how easily thermoplastics can be processed, predict their future performance, and ensure they behave consistently during processing.
Scope, Applications, and Benefits
Scope
ISO 1133 testing evaluates:
- Melt mass-flow rate (MFR, g/10 min)
- Melt volume-flow rate (MVR, cm³/10 min)
- Flow behavior and viscosity of polymers
- Molecular weight indication (inverse relationship with MFR)
- Processability of thermoplastic materials
Applications
- Quality control of polymer production
- Monitoring batch-to-batch consistency
- Evaluation of extrusion and injection molding behavior
- Design and optimization of polymer processing conditions
- Comparison of polymer grades and material selection
- Research and development of thermoplastic formulations
- Identification of material degradation during processing
Benefits
- Ensures consistent processability of polymers
- Provides standardized flow property data
- Supports material selection for specific applications
- Detects changes in molecular weight or degradation
- Facilitates comparison across polymer grades and suppliers
- Enhances quality control and product reliability
- Provides a reproducible and repeatable testing method
ISO 1133 Test Process
Sample Preparation
Polymer pellets, granules, or powder are dried if required and preheated in the melt plastometer barrel.
1Loading & Heating
The sample is loaded into the barrel and heated to the specified temperature until equilibrium is reached.
2Extrusion Under Load
A standard load is applied to force the molten polymer through a die.
3Measurement & Calculation
The mass or volume of extruded polymer is measured to determine MFR (g/10 min) or MVR (cm³/10 min).
4ISO 1133 Technical Specifications
| Parameter | Details |
|---|---|
| Applicable Materials | Thermoplastics (granules, pellets, powders) |
| Temperature Range | Defined by polymer type (typically 190–300°C for common thermoplastics) |
| Load Range | Defined by polymer type (e.g., 2.16 kg, 5 kg, 10 kg standard weights) |
| Output Units | MFR: g/10 min; MVR: cm³/10 min |
| Die Diameter | Typically 2.095 mm, with specified length |
| Piston Diameter | Standardized for flow consistency |
Instrumentation Used for Testing
- Melt flow indexer/melt plastometer
- Precision die and piston assembly
- Analytical balance for weighing extrudate
- Timer
- Thermostatically controlled heating barrel
- Calibration weights and verification standards
- Data recording and analysis software
Results and Deliverables
- Melt Flow Rate (MFR) values (g/10 min)
- Melt Volume-Flow Rate (MVR) values (cm³/10 min)
- Assessment of polymer processability
- Comparison with material specifications or prior batches
- Reports
- Process optimization recommendations
Frequently Asked Questions
Melt Flow Rate (MFR) is defined as the amount of molten plastic that can be extruded through a standard die in 10 minutes, under specified temperature and pressure conditions. MFR is measured in grams per 10 minutes and is a measure of the flowability of a plastic material.
Melt Volume Flow Rate (MVR) is a measure of the volume of molten plastic extruded through the die in 10 minutes, under the same temperature and pressure conditions. MVR is measured in cubic centimetres per 10 minutes.
ISO 1133 provides plastic material producers with a method for determining the processability of a thermoplastic material. ISO 1133 is commonly used in plastic material quality control, plastic material comparison, and plastic process optimisation for extrusion, injection molding, and other plastic process applications.
Typically a few grams of polymer pellets or powder are sufficient for the test, depending on the instrument and the specific test conditions.
A typical ISO 1133 test generally takes 10–20 minutes, including sample preheating, extrusion, and measurement time.
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