The outer sheath of the optical fiber cable is divided into different material types. 1 provider of fiber optic solutions. From A to Z for Data Centers and FTTx 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. This article explains the differences between LSZH, HDPE, and LDPE cable sheaths, and how to select the right option based on real deployment conditions. Our state-of-the-art extrusion technology offers you the ability to utlize a large variety of plastic materials. 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). At the same time, it must have.