When selecting litz wire for high-frequency applications, the choice of insulation wrapping plays a critical role in performance, durability, and cost-efficiency. Two of the most popular options on the market are PET (Polyethylene Terephthalate) wrapping litz wire and PI (Polyimide) wrapping litz wire. Understanding the differences can help engineers and procurement teams make smarter decisions.
What Is PET Wrapping Litz Wire?
PET wrapping litz wire uses a polyester film tape wound around the conductor bundle. It offers excellent electrical insulation, good mechanical protection, and cost-effective manufacturing. PET litz wire is widely used in transformers, inductors, wireless charging coils, and consumer electronics where operating temperatures remain moderate (typically up to 130°C). Its flexibility and affordability make it a go-to choice for mass-production applications.
What Is PI Wrapping Litz Wire?
PI wrapping litz wire utilizes polyimide film — the same material used in aerospace and military-grade electronics. It delivers superior thermal resistance, withstanding continuous operating temperatures up to 220°C or higher. PI litz wire excels in EV motors, aerospace power systems, high-frequency inverters, and industrial equipment where extreme heat and harsh environments are common. Though it comes at a higher cost, its long-term reliability justifies the investment.
Key Differences at a Glance
| Feature | PET Wrapping Litz Wire | PI Wrapping Litz Wire |
| Temperature Rating | Up to 130°C | Up to 180°C |
| Cost | Lower | Higher |
| Flexibility | High | Moderate |
| Application | Consumer electronics, chargers | EV, aerospace, industrial |
| Chemical Resistance | Moderate | Excellent |
Conclusion
Both PET and PI wrapping litz wires serve essential roles across industries. Choose PET for budget-conscious, moderate-temperature projects, and opt for PI when performance under extreme conditions is non-negotiable. Partnering with a reliable litz wire manufacturer ensures you get the right specification for your exact needs.
Looking for custom litz wire solutions? Contact our engineering team today for samples and technical support.
Post time: Aug-30-2026
