It is carried out at flow rates far removed from the flow rates experienced in the cavities and feed systems in injection moulding. The test involves measuring the mass of melt extruded from a simple piston extruder, through a standard orifice and at standard temperatures. This is easy and inexpensive to carry out and was originally intended as a method of crudely ranking materials. MFR values in data sheets are derived from a relatively simple test. This is to establish if the new grade has the same melt viscosity performance.Įven if the new grade has an identical MFR, this is no guarantee it will perform the same in injection moulding. One of the first properties to be consulted on the new data sheet is usually the MFR. Often a moulder has to change material grades.
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