Rubber compounds are known to be very shear-thinning and possess a strong degree of viscoelasticity. A series of rheological measurements for rubber are carried out using a cone-and-plate rheometer and a high-pressure capillary rheometer in order to study the effect of different die characteristics and temperature. The flow simulations are performed for axisymmetric (capillary dies) extrusion. The flow simulations are performed using integral (K-BKZ) rheological model. The effect of rheological properties is investigated and some conclusions are drawn regarding the ability of the integral K-BKZ model to capture the viscoelastic behavior of rubber.