PBO, which is called 21st century super fiber. PBO is a kind of metal fiber. As a super fiber in the 21st century, it has excellent physical, mechanical and chemical properties. The felt made with PBO as the raw material is usually brown or tawny in shape such as roller, belt and pad. The physical and chemical properties of PBO fibers completely exceed those of Kevlar, which has been a leader in the field of high-performance fibers. PBO roller with temperature resistance up to 600â?? can be used for aluminum extruder outlet and slide. When the aluminum profile is extruded through the mold, the temperature is as high as 550â??. With ordinary materials, the world simply cannot withstand such a high temperature, but PBO can.