Black polyethylene sheath material for optical cables

Black polyethylene (PE), including HDPE and LLDPE, is widely used as a durable, UV-resistant, and protective outer sheath for optical cables.Types of Black PE Sheath Materials

High-Density Polyethylene (HDPE) is commonly used for optical cable sheaths due to its high mechanical strength, wear resistance, and smooth surface, making it suitable for direct burial, overhead, and outdoor installations . HDPE sheaths can maintain flexibility in temperatures ranging from -60℃ to 80℃ and have an outdoor service life exceeding 20 years when UV stabilizers are added . Virgin HDPE formulations provide stable testing performance and can replace imported or petrochemical products of similar grade . Linear Low-Density Polyethylene (LLDPE) is another option, offering good extrusion performance and low internal stress when processed correctly. LLDPE sheaths are suitable for optical cables and wires, and their extrusion parameters can be optimized using PE screw extruders with segmented cooling to reduce internal stress .

Performance Characteristics

• Mechanical Strength: HDPE sheaths have compressive strength above 25 MPa, ensuring protection against external forces .
• Surface Quality: Smooth surfaces (friction coefficient ≤ 0.15) facilitate conduit installation and reduce wear .
• Environmental Resistance: Both HDPE and LLDPE sheaths resist moisture, UV radiation, and chemical corrosion, ensuring long-term signal stability .
• Temperature Range: Flexible from -60℃ to 80℃, suitable for diverse climates .
• Flame Retardancy: LSZH (Low Smoke Zero Halogen) formulations can be customized to reduce smoke and toxic gas emission in case of fire .

Applications

Black PE sheaths are used in optical fiber cables for telecommunications, power, marine, automotive, and industrial applications . They are suitable for rodent- and termite-resistant cables, direct burial, and outdoor installations where mechanical and environmental protection is critical .

Standards and Compliance

• GB/T 15065-2009 and YD/T 1485-2006 for mechanical and physical properties .
• IEC 60754 and IEC 61034 for LSZH materials, ensuring low halogen emission and smoke density .
• RoHS compliance for environmental safety .

Storage and Handling

PE sheath materials should be stored in dry, ventilated warehouses, protected from sunlight, rain, and damp conditions. Packaging options include 25 kg paper-plastic composite bags or larger polyethylene bags for bulk storage . In summary, black PE sheaths, particularly HDPE and LLDPE, provide robust mechanical protection, environmental resistance, and optional LSZH safety features, making them ideal for high-performance optical cable applications.