Polyester & Polypropylene Insulated Wires

Polyester insulation, commonly using PET film rated to ~125°C continuous (sometimes up to 130°C), delivers high dielectric strength (~580 V/μm), excellent UV resistance, mechanical toughness, creep resistance, moisture tolerance, and superior flexibility—making it ideal for demanding winding and outdoor applications. Polypropylene (PP) insulation operates around –40°C to ~105°C steady (melting point ~160–170°C), exhibits a lower dielectric constant (~2.2), very low dielectric loss, and high breakdown strength (~650 V/μm); it is moisture‑resistant, recyclable, lightweight, and chemically inert, but suffers from brittleness at low temperatures, poor UV resistance, and reduced flexibilit. In summary, choose polyester‑film insulated wire when mechanical resilience, UV endurance, thermal cycling durability, and flexibility are critical; choose polypropylene‑film insulated wire when minimal dielectric loss, signal integrity, light weight, moisture resistance, and recyclability are priorities in thin-wall or high-frequency applications.