Melt viscosity

This test method is used to investigate the flow properties of polymers in a capillary rheometer.

The shear viscosity [Pas] and shear speed [1/s] are calculated from the test pressure or volume flow rate (depending on type of equipment) determined during the extrusion of a plastic melt through a capillary with defined dimensions and presented as a shear viscosity function. The shear viscosity function serves as a basis for assessing the processability of a molding compound. The flow properties of a molding compound depend in turn on its molecular structure.

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