LSZH (low-smoke zero-halogen) is optical cables' most common flame-retardant material. Types and characteristics of flame-retardant optical cables Halogen-free low-smoke flame-retardant optical cable Halogen-free low-smoke flame-retardant optical cable not only has excellent flame retardancy and the materials used do not contain halogen components, so it is less corrosive and toxic. Flame-retardant optical cables are an essential component in the telecommunications industry, ensuring the safety and reliability of data transmission. These cables are designed to resist fire and prevent the spread of flames, making them crucial for installations in high-risk environments. In this. When you specify or buy fiber cables, the jacket material and fire rating are as important as fiber type and connector. This short guide explains the commonly used materials — LSZH and PVC — how industry fire-rating systems (plenum, riser, vertical flame tests) work, and practical tradeoffs so you. fireflix cables are offered in either single core, multicore or multi-pair constructions. The insulation material can be elastomeric (EPR, SR), thermosetting (XLPE, LSZH) or thermoplastic (EVA, LSZH) to meet different stringent environment requirement. These cables are engineered.