Outer sheath material of optical cable

The outer sheath of an optical cable is typically made from materials such as PVC, PE, LSZH, or specialized flame-retardant and rodent-resistant compounds, chosen based on environmental and safety requirements.Common Outer Sheath MaterialsPVC (Polyvinyl Chloride) is widely used for indoor optical cables due to its flexibility, durability, and chemical resistance. It provides good flame resistance but releases dense smoke and corrosive gases when burned, making it less suitable for enclosed public spaces or areas with strict fire safety requirements . PE (Polyethylene) is commonly used for outdoor cables. It is odorless, non-toxic, and highly resistant to low temperatures, UV radiation, and chemical corrosion. Variants include MDPE (medium density) and HDPE (high density), which offer enhanced mechanical strength and weather resistance . LSZH (Low Smoke Zero Halogen) materials are designed for environments where fire safety and air quality are critical. LSZH sheaths emit minimal smoke and no halogen gases during combustion, making them ideal for data centers, tunnels, and indoor installations where human safety is a priority . Specialized Sheaths include AT (anti-tracking) materials for high-voltage environments, rodent-resistant sheaths for underground or tunnel installations, and flame-retardant PE for areas requiring enhanced fire protection .Selection ConsiderationsThe choice of outer sheath material depends on:Installation environment: Indoor vs outdoor, exposure to UV, moisture, or chemicals.Fire safety requirements: LSZH or flame-retardant materials for high-risk areas.Mechanical protection: Rodent-proof or armored sheaths for underground or harsh environments.Temperature and flexibility: PE for extreme temperatures, LDPE for flexible applications . In summary, the outer sheath material is a critical component that protects optical fibers from mechanical, chemical, and environmental damage while meeting fire safety and regulatory standards. The most common materials are PVC for indoor use, PE for outdoor use, and LSZH for fire-sensitive environments, with specialized options available for high-risk or extreme conditions .