... PBT (polybutylene terephthalate) filaments chemically treated to produce the unique tapered ends. 1.Desc.PBT filament has excellent ... is used for processing toothbrush, food-industry brushes, paint brush and cosmetic brush, etc.PBT tapered filament is divided into single ... toothbrushes, tapered filaments, abrasive filaments, and industrial filaments.The main material is PBT,NYLON,PA6,PA66,PA610,PA612, ...