Invisible cable sheaths can be made of PVC or nylon materials. PVC vs LSZH vs TPU: Which sheath material for fiber optic cables in 2026? The jacket material determines the reliability, fire resistance, and lifespan of a fiber optic cable. Three main choices are available: cost-effective PVC, LSZH (compliant with regulations), and TPU (for extreme. What Is a Cable Sheath and Why It Matters 🔍 The cable sheath is the outer protective layer of a fiber optic cable. 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. The sheath or outer sheath is the outermost protective layer in the optical cable structure, mainly made of PE sheath material and PVC sheath material, and halogen-free flame-retardant sheath material and electric tracking resistant sheath material are used in special occasions.
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