... treated to produce the unique tapered ends. 1.Desc.PBT filament has excellent performance of toughness,resisting tiredness and shock. And ... .Comparing with Nylon 612, it’s more economical,generally PBT filament is used for processing toothbrush, food-industry brushes, paint brush ... filaments, and industrial filaments.The main material is PBT,NYLON,PA6,PA66,PA610,PA612,PP,PS etc.We adopt high quality ...