Polyolefin Elastomer for Wire and Cable Insulation: Flexible, Durable, and Safe

How POE enables high-performance cable compounds — flexibility, flame retardance, and long-term reliability for power and data transmission

Wire and cable insulation must balance competing demands: flexibility for installation, durability for service life, and safety in case of fire. Polyolefin elastomer has become a key material for achieving this balance — especially in halogen-free flame-retardant (HFFR) formulations where traditional PVC is no longer acceptable.

We supply POE grades specifically developed for wire and cable applications, with optimized properties for insulation, jacketing, and specialty cable compounds. Here's how POE fits into cable manufacturing.

Why POE for Wire and Cable

Traditional cable materials each have limitations that POE addresses:

• Flexibility at low temperatures: POE remains flexible down to −50°C or lower, making it ideal for outdoor and cold-climate installations where PVC becomes brittle.
• Halogen-free options: POE can be formulated into HFFR compounds using metal hydroxide fillers (ATH, MDH) — no halogens, low smoke, and reduced toxicity in fire.
• Better aging resistance: POE's saturated backbone resists oxidation better than unsaturated rubbers, providing longer service life in outdoor and high-temperature applications.
• Processing ease: POE compounds extrude smoothly on standard cable equipment without the curing requirements of crosslinked rubber.

Cable Applications for POE

POE finds use across multiple cable types, each with specific formulation approaches:

Halogen-Free Flame-Retardant (HFFR) Formulations

The most demanding cable application for POE is HFFR insulation and jacketing. These formulations replace halogenated materials with metal hydroxide flame retardants:

The challenge with HFFR formulations is achieving adequate flame retardance while maintaining mechanical properties and processability. High filler loadings make compounds stiff and heavy. POE's inherent flexibility helps compensate, but careful formulation is required.

Processing POE Cable Compounds

POE cable compounds process on standard extrusion equipment with some specific considerations:

• Extruder temperature: 170–210°C depending on compound. HFFR compounds with high ATH/MDH loadings need lower temperatures to prevent premature decomposition of the flame retardant (ATH decomposes at ~200°C).
• Screw design: Barrier screws with mixing sections work well for POE compounds. For HFFR formulations, distributive mixing is critical to achieve uniform filler dispersion.
• Die design: Standard extrusion dies for wire and cable. POE's good melt strength allows for good concentricity control in insulation extrusion.
• Cooling: Water trough cooling is standard. POE's slower crystallization vs. PE means slightly longer cooling may be needed for HFFR compounds to prevent deformation.

Testing and Standards Compliance

Cable materials must meet rigorous testing standards for safety and performance:

• Flame spread (IEC 60332-1, UL 1581): Measures how far flame travels along a vertical cable sample. HFFR POE compounds typically achieve low flame spread ratings.
• Smoke density (IEC 61034, ASTM E662): Measures light transmission through smoke generated by burning cable. POE-HFFR compounds achieve low smoke density vs. halogenated materials.
• Acid gas generation (IEC 60754): Measures HCl and other acid gases released during combustion. POE-HFFR produces minimal acid gas — critical for protecting electronic equipment and occupant safety.
• Volume resistivity (IEC 60227): Measures electrical insulation properties. POE compounds achieve >10¹² Ω·cm, suitable for low-voltage insulation.
• Aging tests (IEC 60216): Long-term heat aging to establish temperature ratings. POE compounds are typically rated for 90°C continuous service, with some formulations achieving 105°C.