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Thermal Flow Stability

Test ID  

This test determines the change in viscosity of a plastic as a function of time.  The sample, dried if needed, is loaded into a preheated test barrel of a capillary rheometer.  The viscosity is measured at regular time intervals at a constant shear rate, and the resulting data are presented as a curve.  Where possible, data are extrapolated back to zero time to provide an estimate of an “intrinsic viscosity”.    
ASTM D3835  
Viscosity v. time data are reported. This data appears in Matereality as Capillary Viscosity.  
Replicates (# of times this test is repeated)  
0.5 - kg of pellets [details]


This test yields important information about the thermal stability of plastics. It provides an outer limit on barrel residence times in extrusion and molding applications.