Five loading levels of the compatibilizer were studied. It was found that the content of 5 wt% of HDPE was the proper amount of the compatibilizer for use in this type of TPV. Lower amounts of HDPE gave lower interaction between the phases because the interface surfaces were not fully covered by the compatibilizer. Excessive amounts of the compatibilizer induced the formation of micelles, which could possibly act as weak points during the deformation process and as a lubricant during the flow.