Heavy Duty Melt Flow Index Apparatus, Melt Flow Index Machine High Speed Mfi452

Melt Flow Index Tester ASTM D1238 Melt Flow Rates of Thermoplastics MFI452
 
Function
The melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) are determined by extruding molten
material from the barrel of a plastometer under preset conditions of temperature and load. For melt mass-flow rate, timed segments of the extrudate are weighed and the extrudate rate is calculated in g/10 min and
recorded. For melt volume-flow rate, the distance that the piston moves in a specified time or the time required for the piston to move a specified distance is measured to generate data in cm3/10 min. Melt volume-flow rate may be converted to melt mass-flow rate, or vice-versa, if the density of the material is known under the conditions of the test.
 
Standards
ISO1133, ASTM D1238, ASTM D3364, BS2782, DIN53735, JIS K7210
 

ASTM D1238 - Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer

1.1 This test method covers measurement of the rate of extrusion of molten resins through a die of a specified length and diameter under prescribed conditions of temperature, load, and piston position in the barrel as the timed measurement is being made.
1.2 Procedure A is a manual cutoff operation based on time used for materials having flow rates that fall generally between 0.15 and 50 g/10 min. Procedure B is an automatically timed flow rate measurement used for materials having flows from 0.50 to 900 g/10 min. By both procedures, the piston travel is generally the same during the timed measurement; the piston foot is about 46 and 20.6 mm above the die. Comparable flow rates have been obtained by these procedures in interlaboratory round-robin measurements of several materials.
13.1. Provision is made for calculation of melt volume-flow rate as well as melt mass-flow rate.

4. Significance and Use
4.1 This test method is particularly useful for quality control tests on thermoplastics.
NOTE 3-Polymers having flow rates less than 0.15 or greater than 900 g/10 min may be tested by the procedures in this test method; however,precision data have not been developed.
4.2 This test method serves to indicate the uniformity of the flow rate of the polymer as made by an individual process and, in this case, may be indicative of uniformity of other properties.
However, uniformity of flow rate among various polymers as made by various processes does not, in the absence of other tests, indicate uniformity of other properties.
4.3 The flow rate obtained with the extrusion plastometer is not a fundamental polymer property. It is an empirically defined parameter critically influenced by the physical properties and molecular structure of the polymer and the conditions of measurement. The rheological characteristics of polymer melts depend on a number of variables. Since the values of these variables occurring in this test may differ substantially
from those in large-scale processes, test results may not correlate directly with processing behavior.
4.4 The flow rate of a material may be measured under any of the conditions listed for it in 8.2. Additional characterization of a material can be obtained if more than one condition is used. In case two conditions are employed, a Flow Rate Ratio (FRR) may be obtained by dividing the flow rate at one condition by the flow rate at the other condition.