In this work, we have prepared blacked PE-100 compounds containing 2.5 wt. % of carbon black (CB), originated from different commercially available CB masterbatches, using a laboratory co-rotating twin screw extruder. A control sample with the same CB content was produced using a p-type CB powder in the same condition. Rheological properties of the samples were measured at melt state, 200 °C, and different flow fields including oscillatory shear, rotational shear and capillary shear modes. It was found that, capillary shear flow measurements are not sensitive enough to different microstructures of samples due to observing almost the same flow curve for different blacked samples. This behavior can be explained by the large deformation and hence sever structural changes and orientation encountered during capillary shear flow. On the other hand, distinctive differences between storage modulus, complex viscosity and rotational shear viscosity of blacked samples were observed, helping us to rank different CB masterbatches by comparison of their rheological properties with the control sample, in line with dispersion test results. In other words, oscillatory and rotational shear measurements are clearly sensitive to the microstructure and rheological behavior of blacked samples containing low amount of CB filler, and these rheological measurements can be successfully used to select the proper CB Masterbatch for production of blacked PE-100 compounds.