The Madison Group Info@madisongroup.com madisoongroup.com What Went Wrong? An injection molded polypropylene part used in a conveyor application was experiencing cracking near the knitline of parts produced from a gray masterbatch resin. No cracking was observed in similar parts produced from a pre-compounded gray resin. All parts were manufactured in the same press/tool and similar process parameters were used for each resin type. The Madison Group 2615 Research Park Drive Madison WI, 53711 USA Ph: (608) 231-1907 madisongroup.com Evaluation A microscopic examination of the fracture site in the failed component revealed that the crack was parallel to, but

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