... processing toothbrush, paint brush and cosmetic brush, etc.PBT resin are melt-extruded into filaments, cooled in water, ... valuable productsand services to you.What is PBT filament?PBT (PolybutyleneTerephthalate) PBT filament has excellent performance of toughness, ... always being perfectly substituted in toothbrushes or cosmetic brushes.PBT Monofilament Properties: • Excellent stiffness in wet or dry ...