Flame-retardant armored single-mode four-core optical fiber

A flame-retardant armored single-mode four-core optical fiber is a robust, fire-resistant cable designed for high-speed, long-distance data transmission with mechanical protection and compliance with fire safety standards.

Construction and Materials

These cables typically feature four single-mode optical fibers housed in a central loose tube filled with water-blocking compounds for moisture protection. The fibers are surrounded by high-modulus plastic sleeves and reinforced with metal components, such as corrugated steel tape or stainless steel armor, providing mechanical strength and rodent protection. The outer sheath is usually made of LSZH (Low Smoke Zero Halogen) material, which is flame-retardant, environmentally friendly, and reduces toxic smoke in case of fire.

Some designs also include UV-resistant and weatherproof polyethylene sheaths for outdoor deployment.

Fire Resistance and Standards

These cables are engineered to maintain circuit integrity during fire events. They comply with international standards such as IEC 60331-25 for fire resistance and IEC 60332-2-3 for flame retardancy. The flame-retardant materials ensure that the cable continues to operate in critical applications like fire alarm systems, voice evacuation systems, tunnels, metro lines, and public buildings.

Performance FeaturesSingle-mode OS2 fiber ensures long-distance, low-loss transmission suitable for high-speed networks. Bend-insensitive fibers allow installation in tight spaces without signal degradation. Armored construction provides pressure resistance, wear resistance, and anti-interference capability.

LSZ

H jacket offers low friction, easy handling, and environmental safety.

Applications

These cables are ideal for outdoor and indoor installations where fire safety and mechanical protection are critical. Typical uses include: Data centers and enterprise networksTelecommunication backbonesFTTH (Fiber to the Home) deploymentsCritical infrastructure in tunnels, metro systems, and public buildingsSummaryA flame-retardant armored single-mode four-core optical fiber combines mechanical protection, fire resistance, and high-performance optical transmission.

Its LSZ

H sheath, steel armor, and compliance with fire safety standards make it suitable for demanding environments where both safety and reliability are essential.