Determination of melt mass flow rate mfr and melt volume flow rate mvr iso 131, 2 and astm d1238 extrusion plastometers provide standard values for the melt index mfr and volume index. Pdf determining the melt flow index of polypropylene. Standard test method for melt flow rates of thermoplastics. Melt flow indexer manual and motorized mp1200 from tinius. Working procedure of mfi tester to measure the viscosity. Mp600 extrusion plastometer texas state university. Melt flow index is a measure of the resistance to flow viscosity of the polymer melt at a given temperature under a given force for a predetermined period of time. Melt flow rate testing part 2 to fully appreciate the strengths and weaknesses of the melt flow rate mfr test it is important to know something about the way the test is performed. The mfi is the melt flow index, an empirical measure of melt viscosity used by moulders, and inversely related to molecular weight. The tester conforms to all national and international melt flow. It is generally used as an alternative to procedure b on samples having melt. Injection molding fractional melt index, high density. Series 4000 melt indexer operation manual azurr tech.
Procedure b is generally used with materials having melt flow rates from 0. The basic melt flow indexer, often abbreviated as mfi, is an affordableprice tabletop instrument used to test the melt flow resistance mfr of a wide range of thermoplastic materials. Determination of the melt mass flow rate mfr and melt volume flow rate mvr of thermoplastics. This material was evaluated to determine if long molecular chains can overcome the impact resistance given when using a 67 g10 minutes melt index hdpe material with hexene copolymer. Astmd1238 standard test method for melt flow rates of. Determination of melt mass flow rate mfr and melt volume. More than just a quality control rheological parameter. Melt flow index testing associated polymer labs, inc. This new model, the mp1200, meets, and surpasses, all the requirements of procedure a and procedures b, c and d of astm d1238. It is designed to make melt flow rate testing faster, more accurate and flexible, and generate more rheological information. Measuring mass flow rate mfr and other polymer properties. Astm d1238 standard test method for melt flow rates. The mflow is ideally suited for mfr mvr tests according to iso 13 astm d 1238.
Qualifi 6000 melt flow indexer series can be used for testing mfr and mvr of polycarbonate, fluoroplastics, as well as polyethylene. Presto stantest understands the need for measuring mfi of polymer granules and offers a highquality melt flow index. Series 4000 melt indexer operation manual introduction 3 download to msdos compatible systems methods a, b, or ab conversion and flow rate ratio automated purge or weight lowering control. Melt flow rate measures the rate of extrusion of thermoplastics through an orifice at a prescribed temperature and load. Astm d1238 10 standard test method for melt flow rates. Melt flow indexer qualifi 6000 series astm d1238, iso 13. Part i article pdf available in advances in polymer technology 61. The mflow can be operated stand alone via a modern touch display as well as with the zwickroell test.
It provides a means of measuring flow of a melted material which can be used to differentiate grades as with polyethylene, or. The volume is converted to a mass measurement by multiplying the result by the melt density value for the material see note 2. Using standard test procedure and conditions to perform mfi test on plastic granules is the best way to determine the physical as well as chemical properties of the material. Because the viscosity of a polymer varies with flow. Us4766200a us06945,784 us94578486a us4766200a us 4766200 a us4766200 a us 4766200a us 94578486 a us94578486 a us 94578486a us 4766200 a us4766200 a us 4766200a authority us united states prior art keywords melt flow process mastication polymer flow index. It is generally used for materials having melt flow rates that fall between 0.
A useful measure of the shear stressshear rate relationship flow. Standard test method for melt flow rates of thermoplastics by extrusion plastometer 1. Melt flow index is an assessment of average molecular mass and is an inverse measure of the melt. Iso 13 melt massflow rate and melt volumeflow rate. Tinius olsen is proud to introduce our latest evolution of melt indexer to meet almost every need. Normally, the test conditions for measurement of melt flow rate are specified in the material standard with a reference to this part of iso 13. When asked to offer a solution for measuring the melt flow properties of a polyproylene in accordance to iso 13 procedure b, we recommended our ceast modular melt flow tester. The 4601 melt flow indexer is an affordable and easytouse tabletop instrument that tests the melt flow resistance mfr of a wide range of thermoplastics. Mfi 9 melt flow indexing machine mwd corresponds with a greater shear sensitivity, i. It is generally used as an alternative to procedure b on samples having melt flow rates greater than 75 g10 min.
Both offer a manual means procedure a or method a and automatic timed flow measurement procedure. The result is expressed in grams per 10 minutes g10 min. The heart of the system is a 32 bit microprocessor developed by dynisco polymer test systems. Friction welding of dissimilar plasticbased material by metal powder reinforcement. Standard test procedure and conditions to perform mfi. Melt flow rate testing part 4 reprinted with permission materials know how by michael sepe from michael p. Polyox watersoluble resins melt flow test procedure. Us4766200a process for improving the melt flow index of. Melt flow index tester is an advanced testing machine that is very helpful in the accurate analysis of the melt flow index. The shear rates encountered in the pipes of moulding machines is typically above 10 3 sec. Melt flow index, melt flow rate, astm d1238, iso 13. It is often used in the plastic industry for quality control of thermoplastics.
Of those that do, most dont understand why they are doing it or what they are measuring. Procedure c is an automatically timed measurement used to determine the melt flow. Both astm 1238 and iso 13 offer two variations of the standard melt flow test. Both measure the same property, but slight procedural and equipment differences can yield different results. Iso 131991 determination of the melt mass flow rate mfr and the melt volume flow rate mvr of thermoplastics3 3. This test method is widely used, especially in quality assurance and goods inwards testing. The melt flow index is a major property of the plastics that determines the physical as well as chemical properties of the materials. It is designed to make melt flow rate testing faster, more accurate and flexible.
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