In this research, we choose core material of paragliding cord barding, and this shows typical diffraction patterns for the PBO fiber and Kevlar fiber by synchrotron diffraction patterns. After exposure to the carbon arc lamp, the PBO fiber strength reduces. However, the paragliding cord made by the core materials are made of 4 ply PBO fibers and the cover material are made out of 8 ply HDPET fibers is the best strength. So, PBO fiber has high modulus under paragliding cord barding, it's the best choice.
