ETFE (ethylene tetrafluoroethylene) is a fluoropolymer widely used as insulation for extruded litz wire due to its excellent thermal, chemical, and electrical properties. When evaluating whether ETFE is hard or soft in this application, its mechanical behavior must be considered.
ETFE is inherently a tough and abrasion-resistant material, but its flexibility depends on processing conditions. As an extruded coating for litz wire, ETFE is typically semi-rigid—firm enough to maintain structural integrity yet flexible enough to allow bending and twisting without cracking. Unlike softer materials like PVC or silicone, ETFE does not feel “soft” to the touch but offers a balanced combination of stiffness and pliability.
The hardness of ETFE insulation is influenced by factors such as thickness and extrusion parameters. Thin ETFE coatings retain flexibility, making them suitable for high-frequency litz wire applications where minimal signal loss is crucial. However, thicker extrusions may feel harder, providing enhanced mechanical protection.
Compared to PTFE (polytetrafluoroethylene), ETFE is slightly softer and more flexible, making it preferable for dynamic applications. Its Shore D hardness typically ranges between 50 and 60, indicating moderate rigidity.
In conclusion, ETFE used in extruded litz wire is neither extremely hard nor very soft. It strikes a balance between durability and flexibility, ensuring reliable insulation without compromising performance in demanding electrical environments.
Except for ETFE, Ruiyuan can also supply more options of extruded insulations for litz wire, such as PFA, PTFE, FEP, etc. Made with conductors of copper, tin plated copper strand, silver plated copper wire strand etc.
Post time: Aug-11-2025