Selenis Kempt CR 840 is a polymer that has been designed for high performance monofilament extrusion and fiber extrusion. This product's extended life-span performance and durability makes it unique and the ideal choice to produce bristles for street sweepers. This product has a very high viscosity, delivering excellent melt strength when extruded. The hardness and rigidity of PET make it the perfect solution to sweep fragile road surfaces, such as cobblestone. The inert polyester characteristics deliver a high resistance against biological and chemical attack.