the present invention relates to polypropylene compositions for forming articles through extrusion . these parts are particularly useful in automotive body side moldings applications . in one embodiment , the invention is directed to an extruded resin material comprising a skin layer of polypropylene polymer and a core layer composition comprising a polypropylene polymer with an impact modifier and an inorganic filler . the core composition preferably comprises about 25 - 30 percent by weight of the impact modifiers . the impact modifier is preferably a copolymer of ethylene and a higher alpha olefin . the inorganic filler is present in an amount of about ten percent by weight .