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Flame-retardant and fire-resistant armored optical cable

Fiber and communications infrastructure knowledge brief Published 11 Mar 2024

Prepared for preliminary research by the METRA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Flame-retardant armored optical cables typically use LSZH or PVC outer jackets, steel or aluminum armor, ceramic or mica-based inner sheaths, and gel-filled or loose tube cores to ensure fire resistance and mechanical protection.

Core Materials

The optical fibers are usually housed in gel-filled loose tubes or tight-buffered cores, which protect the fibers from mechanical stress and moisture while maintaining signal integrity during fire exposure ( ). The core may include a central strength member made of steel or fiberglass to provide tensile strength.

Inner Sheath and Flame-

Retardant Layers

To achieve flame retardancy and fire resistance, cables often incorporate ceramic sheathing materials or synthetic mica tape around the cable core ( ). These materials provide high limiting oxygen index (LOI) and can withstand temperatures up to 370–950°C depending on the standard tested, such as IEC60331 or BS6387 ( ). The inner sheath may also include HDPE, PA (nylon), or aluminum layers for chemical and UV resistance ( ).

Armor Materials

Armored optical cables use steel wire, corrugated steel tape, or aluminum interlocking armor to provide mechanical protection against crushing, rodents, and heavy traffic ( ). Corrugated steel tape armor is common in industrial and outdoor applications, offering superior crush resistance and durability.

Outer Jacket Materials

The outer jacket is typically made from Low Smoke Zero Halogen (LSZH) or flame-retardant PVC, which ensures minimal smoke and toxic gas emission during fire ( ). UV-stabilized and weather-resistant formulations are used for outdoor exposure, and colored jackets may be applied for easy identification ( ). Standards ComplianceFlame-retardant armored optical cables are designed to meet international standards such as IEC 60332-1/2/3, IEC 60331, and BS6387, ensuring circuit integrity and minimal signal attenuation during fire events ( ).

High-performance cables can maintain optical transmission with minimal attenuation even under prolonged fire exposure.

Applications

These cables are widely used in subway systems, tunnels, public buildings, industrial plants, and emergency communication systems, where maintaining optical signal integrity during fire is critical ( ). In summary, flame-retardant armored optical cables combine advanced inner sheaths (ceramic or mica), robust armor (steel or aluminum), and LSZH or PVC outer jackets to provide both fire resistance and mechanical protection, ensuring reliable performance in harsh and high-risk environments.

Flame-retardant and fire-resistant armored optical cable - METRA FIBER MARKET [PDF]

Flame-retardant and fire-resistant armored optical cable
What is a Flame Retardant cable and Fire Resistant cable

Pvc & FireTratos Testing FacilityTratos Firesafe-Opti®Tratos Firesafe-Tw950e® 300/500 V – Low Smoke Zero Halogen (LSZH) CablesTratos Firesafe-Tw950s®*CPRFIresafe Fibre Optic cableshave an important role to play. LOW SMOKE ZERO HALOGEN (LSZH) CABLES offer enhanced circuit integrity when exposed to fire. Tratos Firesafe OPTI has been designed for areas where optical fibre cables are required to operate in the event of a fire, for example, railway and highways tunnels, mass transit underground systems...See more on tratosgroup Apar

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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