Several common cable outer sheath materials are PVC, PE, LSZH, AT and rodent-proof sheath materials. Its primary functions include: While the optical fiber itself remains largely unchanged, the sheath material determines how the cable behaves in fire scenarios, outdoor environments. Sheathing has three core values for use in fiber optic design: Protect the fiber. Keep ambient or stray light from creating signal noise (for sensor applications). Glass fiber and plastic fiber is fragile. When individual fibers break, light transmission and uniformity. Get to know the various cable sheath types CST, LSF, PVC, SWA. Understanding the difference helps you make an informed decision when it comes to selecting the right cable for your requirements. It provides both beginner-friendly explanations and advanced engineering insights to help professionals choose the correct cable. The main function of the fiber cable outer sheath is to protect the optical fibers in the optical cable from external damage.