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The semiempirical Bueche‐Harding equation was successfully modified to allow the calculation of experimentally verified melt viscosities of molten poly(ethylene terephthalate) (PET) for shear stresses > 9.65 × 10 5  dynes/cm 2  by accounting for the definite Newtonian region in the flow behavior of PET for shear stresses lE; 9.65 × 10 5  dynes/cm 2 . Melt viscosity values calculated from the modified Bueche‐Harding equation agreed within ±12% of the values calculated from the equations based on experimental data.