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The difficulty is that any two labs can easily come up with different results, making it difficult to determine whether a material meets a desired MFI spec. An extrusion plastometer, more commonly referred to as a melt indexer, is used to determine the MFI of virgin, compounded, and post-processed thermoplastics.The MFI test is used widely among the various segments of the plastics industry. Machines are designed for use in Research and Quality Control to measure material’s strength and performance. We focus exclusively on test measurements, materials testing, and metrology markets, offering a variety of standard products, special transducer designs. As part of their materials-inspection procedures, some processors use the test to determine the amounts of recycled material that can be used in their product while still maintaining end-product specifications. Our standard force products are used for research and development, material testing, creep and fatigue testing, component testing, sub-assembly testing and final assembly testing. A range of product measurement uncertainties are available for everyday requirements to high performance applications.Load CellsTovey custom transducers are incorporated into some of the world's most advanced test systems, constituting the heart of the measurement portion of those systems. Special transducers conforming to specific customer configuration requirements have met stringent creep, non-linearity, hysteresis, moment sensitivity, and temperature sensitivity. Both offer a manual means (Procedure A or Method A) and automatic timed-flow measurement (Procedure B or Method B). High performance special products can be rapidly prototyped (with integrated design, finite element analysis, and manufacturing software), then tested and verified at a high level.
High performance special products can be rapidly prototyped then tested and verified.Tovey Engineering advanced test and calibration expertise is key to the consistently high performance level of our products.
Others may find that the alternative Melt Volume Flow Rate (MVR) procedure, offered by both standards, is more useful.No matter what the procedure selected, it is common for two organizations to test the same material and come up with two different test results, setting off a search to determine the reason for the difference.
Tovey CS metrology grade load cells achieve ASTM E74 lower load limits of less than 10% of range. Tovey automated transfer standard force calibration systems achieve the lowest uncertainties of any competitive systems, closely approximating results from deadweight calibrators.
Tovey has improved load cell and system performance over the years by following a program of continuous engineering innovation for each element of the manufacturing and testing processes. Has the machine been calibrated by a certified metrologist—checking temperature, physical dimensions, and distance- and time-measurement accuracy?

Are the operators properly trained and using the same testing technique?The chances of obtaining precise and accurate test results can be greatly increased by closely following proper testing procedures and requirements, by machine verification, and by periodic testing of control materials or a standard reference material (SRM).
ManufacturerGeneral Purpose Load CellsTovey Engineering manufactures high performance transducers designed for the most demanding applications in test and metrology.
ASTM D1238 offers a Troubleshooting Guide in the Appendix of the document and the following thoughts are based upon it. Some labs maintain their own supply of reference material, which they use to maintain in-house quality programs. Participation is voluntary and the programs charge a fee, but they provide a benchmark to compare how your testing practices stand up against other participants. The range of factors that can contribute to questionable MFI test results is wide and deep. The verification procedure will check the dimensions of the machine, as well as the temperature-control and distance-measuring devices installed on the machine, for conformance to the relevant test standard. These should be replaced as necessary.Prior to running any tests, visually inspect all components of the testing machine.
The furnace of the instrument, which contains a heated metal cylinder with a defined bore, should be leveled using equipment typically supplied by the equipment manufacturer.
Dimensional checks are to be made when the machine is cold.Cleaning the components of the test machine must be done after every test. No residue from prior tests should remain on the surfaces of the metal parts directly involved in the test.
Solvents are usually not necessary nor recommended.The barrel finish should be mirror-like and free of rust, scratches, and imperfections.
Clean the barrel by repeated swabbing with a cotton cleaning patch using tools normally provided by the equipment manufacturer.
Some materials are a little more difficult to remove and may require the use of a brass brush. The die should be visually inspected to make sure that the entrance of the bore is not chipped or rounded. Periodically verify that the piston is straight and that the leading edge of the piston foot is sharp and free of burrs or damage that would cause it to rub against the wall of the barrel.

Resin suppliers generally post their test conditions along with reported test values.Moisture content can be a large variable for some materials (ABS, PMMA, PET, and nylon, for instance).
Using a tool to pack material into the bore during the charging process is common practice, but it can result in variable test results for some materials if multiple machine operators are involved, because they commonly use different amounts of force to pack the material.
The piston foot is required to reach that point within 420 ± 30 sec after the material charging has been completed. It is common to weigh the material prior to charging or to use a volume reference when charging the bore.Keeping enough material in the bore can be just as challenging for materials with higher flow rates. To meet the preheat and test start-time requirements, it may be necessary to unload the test load from the piston or stop its travel during the preheat period. In some cases, the orifice needs to be plugged to stop the material from running out completely before the start of the test.
Extra care must be used when dealing with high-flow materials to avoid burns.Extrudate cutting technique can be a factor in Procedure A tests.
A spatula or similar tool is used to cut material as it extrudes from the die at precise intervals. However, it should be noted that the chances for error due to manual cutting increase with higher melt flow values.
It is also important to note that the first cut (starting at 46 ± 2 mm) is considered to be the reportable test result.
This practice is acceptable as long as the specified distances are used.Procedure B requires the use of a melt-density value, which is the density of the material when it is in its molten state.
These factors will change with additives and processing, so it is more accurate to measure the actual melt density of the specific resin being tested.
You can combine a Procedure A and Procedure B test to give both weight and volume data, which allow calculation of melt density.If you are suspicious of the melt-flow data you are obtaining, you have plenty of options for checking and updating equipment, examining procedures, and comparing results with those obtained by others.

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