Polypropylene Fibrillated. Made from virgin polypropylene (homo-polymer) which is extruded with additives into a film, then fibrillated and packaged to your specification. Supplied in flame retardant (Oxygen Index 26%), which is yellow, or regular, which is white. This product is used in tray cable, communication and computer cable, and in plastic flexible cord. It is also used in any cable where a non-hygroscopic requirement exists. This filler is packaged in center pull boxes for tying twine.