Melt Viscosity and Apparent Melt Viscosity - ASTM D3835 Plastic Test Standard
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Property information for specific grades of resin are available in the Prospector Plastics Database. Property Search let's you search for plastics by more than 400 material properties. Melt Viscosity and Apparent Melt Viscosity - ASTM D3835Melt ViscosityThe ratio of shear stress to shear rate at a given shear stress or shear rate. Apparent ViscosityThe melt viscosity of a material exhibiting non-Newtonian behavior (ratio of shear stress to shear rate is not constant at a specified temperature and pressure). Apparent viscosity values can be corrected for comparison with melt viscosity values.
Capillary RheometerTesting is performed using a capillary rheometer. A plastic charge is heated in the rheometer barrel and is forced through a die with a plunger. The plunger is pushed either by a constant force or at constant rate depending on the equipment. Measurements are taken once the system has reached steady-state operation. Melt viscosity is sensitive to molecular weight, melt stability, fillers, and additives. Property information for specific grades of resin are available in the Prospector Plastics Database. |
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