What is TGGT High Temp Wire?

The 250°C Continuous Workhorse

When temperatures exceed the capacity of SRML (150ºC | 200ºC) or standard mica-insulated wires, an excellent option is TGGT High-Temperature Wire.  TGGT stands for Teflon (PTFE) / Glass / Glass / Teflon (PTFE). This specialized, single-conductor wire is engineered for sustained operation in the most severe industrial heat environments, particularly where moisture or oil is a factor

TGGT is commonly used for high-temperature wiring in ovens, kilns, foundries, and industrial heating processes. Its construction delivers maximum thermal stability and resistance to breakdown up to 250°C (482°F).

Below is general information engineers, installers, OEM manufacturers, and industrial maintenance teams should know about when selecting this premium high-temp wire.

1. The Construction: Layers of Thermal Defense

TGGT's ability to withstand 250°C continuous service comes from its layered construction, combining high-performance materials.

• Conductor: The conductor is finely stranded, nickel-plated or tin-coated Copper. Nickel plating is crucial as it prevents the copper from oxidizing and degrading at the extreme temperatures this wire is rated for.

• Fiberglass Braid Jacket: A woven Fiberglass Braid provides mechanical protection against abrasion, cuts, and installation stress.

• Teflon (PTFE) Insulation: The outer layer is finished with a Teflon (PTFE) or glass braid impregnation . This final step seals the cable, making it resistant to moisture, oil, and chemicals.

2. Rating & Compliance: Exceeding Standard Limits

TGGT belongs to the family of high-temperature appliance and fixture wires and meets stringent UL standards for extreme heat.

• Continuous Temperature Rating: The primary benefit is its rating for continuous operation at 250°C. This is 50°C higher than the standard maximum of SRML wire, filling a crucial gap in industrial applications.

• Voltage Rating: TGGT is typically rated for 600 Volts, making it suitable for standard industrial control and power circuits.

• UL Listings: TGGT carries UL listings of UL5256 (18 AWG to 2 AWG) & UL5251 (1/0 to 4/0) which certifies the wire meets performance and safety standards for high-temperature fixture and appliance applications.

• Flexibility: While designed for static installation, the stranded conductor and layered design offer good handling for installation inside tight equipment enclosures.

3. Sizing and Selection Notes

• Sizing (AWG): TGGT is typically available in gauges 18 AWG to 4/0 for internal equipment wiring, control circuits, and power connections.

• Nickel-Plated Copper: For sustained operation at or above 200°C, the nickel-plated copper conductor is mandatory. Nickel provides a robust barrier against copper oxidation (known as "red rust"), which would otherwise lead to increased resistance and connection failure.

• Termination: Proper high-temperature lugs and terminal blocks must be used. Ensure all terminating hardware is rated for the maximum temperature of the application to prevent heat-related failures at the connection point.

4. Primary Applications: Where TGGT Is Essential

If your equipment generates or operates in extreme heat up to 250°C, TGGT is an excellent option:

• Industrial Ovens & Kilns: Wiring power and control circuits near heating elements and inside oven walls.

• Chemical Processing: Control and power wiring exposed to aggressive cleaning agents or corrosive vapors.

• Testing Equipment: Internal wiring for high-performance laboratory equipment and analyzers.

• Aerospace/Military: Wiring for sensitive controls and equipment where lightweight, high-temperature, and chemically inert wire is mandated.

5. Why Buy TGGT High-Temp Wire?

TGGT High-Temperature Wire is the premier solution for sustained 250°C service. Its unique combination of nickel-plated copper, fiberglass, and a Teflon seal provides unmatched thermal stability, chemical resistance, and protection against moisture and oil, guaranteeing reliable circuit operation under maximum heat.

Wire America is proud to offer this product by the foot or by the spool with fast shipping to your location. 

Click Here to Shop Our TGGT High Temp Wire Selection

At Wire America, we believe in genuine conversation. You'll always talk with real people who understand that every project requires careful product selection. We're here to ensure you feel educated, confident, and great about your final purchase. Feel free to give us a call to discuss your project! You can reach us at: 833-268-8644

⚠️ Important Disclaimer: Safety and Compliance

Wire America provides this information as a guide only. Electrical installations must strictly adhere to the National Electrical Code (NEC) and all state, local, and jurisdictional requirements, which vary widely. Always consult a licensed electrician, electrical engineer, or the local inspecting authority before purchasing material or starting any electrical project. Wire America assumes no liability for the installation, use, or interpretation of these guides.

For information on other high-temp wire we offer check out these options below:

SRML (Silicone Rubber Motor Lead Wire) - 150ºC | 200ºC

MG Wire (Mica Glass) - 450°C | 550°C