Indoor Optical Cable Sheathing Material

Indoor optical cables commonly use PVC, LSZH, or plenum-rated fluoropolymer materials for their outer sheaths, chosen for mechanical protection, fire safety, and environmental resistance. Common Sheath Materials1.

PV

C (Polyvinyl Chloride) PVC is widely used for indoor optical cables due to its low cost, flexibility, and good mechanical protection. It provides resistance to abrasion, moisture, and general environmental hazards. However, PVC has limited flame-retardant properties and releases toxic gases like hydrogen chloride when burned, making it less suitable for high fire-risk areas.

2.

LSZ

H (Low Smoke Zero Halogen) LSZH is increasingly popular for indoor applications where fire safety is critical. It is a thermoplastic compound that emits minimal smoke and no halogen gases during combustion.

LSZ

H provides good mechanical protection and environmental resistance, making it ideal for data centers, hospitals, and public buildings where personnel safety and air quality are important. 3.

Plenum-

Rated Jackets (OFNP, FEP, PTFE) Plenum-rated sheaths are designed for use in air-handling spaces such as ducts and ceilings. These jackets are typically made from fluoropolymer materials like FEP (fluorinated ethylene propylene) or PTFE (polytetrafluoroethylene). They offer excellent flame-retardant properties, resist ignition, and prevent flame propagation, complying with building codes for plenum spaces.

Selection Considerations

When choosing a sheath material for indoor optical cables, the following factors are important: Fire safety requirements: LSZH or plenum-rated jackets are preferred in high-risk or public areas. Mechanical protection: All materials provide basic protection, but PVC and LSZH are more flexible for general indoor installations. Environmental resistance: LSZH and plenum materials offer better performance in areas with strict safety or air quality standards.

Regulatory compliance: Local building codes may mandate plenum-rated cables in air-handling spaces. In summary, PVC is suitable for general indoor wiring, LSZH is preferred for fire-sensitive environments, and plenum-rated fluoropolymers are required in air-handling spaces, ensuring both safety and compliance with regulations.