Melt flow rate (MFR)
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I would like to ask everyone: Under normal circumstances, what are the measurement tolerances for MFR of PC materials and TPC materials? (Excluding instrument tolerances) PS.: In accordance with ISO 1133. Last edited in this post by QXZ-1966 on 2009-3-10 09:06]
It might be a bit confusing; what I mean is: what is the tolerance for the MFR measurement values of PCs, in +/- terms? What is the tolerance for the MFR measurement results of TPC, +/– how much?
It should be repeatability or reproducibility. In chemical analysis, error is generally not referred to as a “tolerance”. This post was last edited by dm88440 on 2009-3-12 09:45]
Many of these measurement values for chemical raw materials are fake. Only after using them can the truth be known: lol
Melt index testing: It only measures the apparent viscosity, that is, the viscosity under low shear conditions, which is usually only a few hundred. In actual applications, such as in injection molding or extrusion machines, the shear rate is much higher, sometimes reaching tens of thousands. Therefore, there is a difference between MFR test results and those observed in practical use. As for the repeatability of MFR testing, it’s difficult to determine; it depends on the material’s inherent flow properties as well as the testing conditions used