The metallic effects of the plastics came to revolutionize the automotive industry replacing the metal by plastic in components with certain aesthetic requirements. In order to optimize mechanical and fracture properties, the knowledge of the relationship between morphology and deformation behavior is essential. The behavior of PP based composites hardly depends on the extent of PP crystallinity and morphology. The present work aims to evaluate the influence of aluminium pigment on the performance of PP injected mouldings. These have the advantage of eliminating post-processing operations but the appearance of flow and weld lines affects the look of the injected part. These defects can be minimized by adjusting the processing conditions The present work reported a complete characterization, including aesthetical, morphological and mechanical characterization of double gated injection moulded PP parts with Al pigment X-ray diffraction and DSC revealed that Al particles sensibly affect PP microstructure inducing the formation of β polymorph, being its content dependent on processing conditions A distribution of fracture properties was found in the parts. In weld line zone, PP/Al parts behave in a brittle way with no formation of plastic zone (the deformation focuses along the weld line). On the contrary the α-PP parts behave in a more ductile way, a diamond shape plastic zone was developed. Away from weld lines, PP parts behave in a ductile manner, while PP/Al parts exhibited different amounts of plastic behavior depending on processing conditions. Both initiation and propagation fracture parameters of PP and PP/Al mouldings were similar despite substantial difference in the related plastic zones and failure micro-mechanisms involved were observed. In opposition with α-PP an elliptical shape plastic zone for β-PP/Al samples was observed. It appears that the beneficial β polymorph counterbalanced the detrimental load concentration effect of Al flake particles