... treated to produce the unique tapered ends. 1.Desc.PBT filament has excellent performance of toughness,resisting tiredness and ... .Comparing with Nylon 612, it’s more economical,generally PBT filament is used for processing toothbrush, food-industry brushes, ... filament is divided into single tapered PBT filament and double tapered PBT filament. Single tapered PBT filament is used for processing paint ...