FEP Wire

Overview
FEP wire is insulated with Fluorinated Ethylene Propylene (FEP), a melt-processable fluoropolymer known for its excellent thermal, chemical, and electrical properties. It is widely used in chemical, medical, electronics, and aerospace applications where reliability under harsh conditions is essential. According to UL standards, UL 1332 is a typical FEP-insulated hook-up wire, rated for 200 °C and 300 V, while UL 1330 provides a 200 °C, 600 V option—both serving as industry benchmarks.

Properties
FEP offers a low dielectric constant, non-stick surface, and low friction, making it well-suited for compact assemblies and stable signal transmission. It is chemically inert to most solvents, oils, and acids, and provides good UV and weather resistance. Voltage ratings depend on the UL style, AWG size, and insulation thickness—for example, UL 1332 is 300 V, while UL 1330 supports 600 V. Many FEP wire types are also designed to meet the UL VW-1 vertical flame test, depending on construction and manufacturer.

Applications
Typical constructions use tinned copper or silver-plated copper stranded conductors, balancing conductivity with routing flexibility. Commercial FEP wire offerings, such as UL 1332, are available in a wide range of AWG sizes. Thanks to its heat resistance, chemical durability, and electrical stability, FEP wire is widely used in medical devices, aerospace and aviation systems, industrial automation, and semiconductor equipment, where long-term reliability and insulation integrity are critical.