TGGT - 250°C

TGGT Wire is a high-temperature electrical wire built with a unique Teflon (PTFE) / Glass / Glass / Teflon (PTFE) insulation structure, designed for extreme heat applications. It features stranded nickel-plated copper conductors, an inner PTFE layer for high-temperature and chemical resistance, followed by multiple fiberglass yarn layers for thermal insulation and mechanical strength, and an outer treated fiberglass braid for abrasion protection. Rated for 600 volts and a continuous temperature of 250°C (482°F), TGGT wire is highly resistant to heat, abrasion, chemicals, and moisture. It is widely used for internal wiring in industrial and household ovens, furnaces, kilns, and other high-temperature processing equipment. Read our TGGT High Temp Wire Buyers Guide.

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TGGT stands for Teflon - Glass - Glass - Teflon. It is a specialized 600V high-temperature electrical wire engineered for extreme heat environments up to 250°C (482°F). Constructed with nickel-plated copper conductors, PTFE (Teflon) tape, wrapped fiberglass yarn, and an outer treated fiberglass braid, it provides exceptional thermal protection, chemical resistance, and physical durability.

TGGT wire is rated for a continuous operating temperature of 250°C (482°F). It typically carries a 600-Volt rating for standard industrial control and power circuits, though specific UL styles (such as UL 5251 and UL 5256) may carry a 300-Volt rating for lighter applications.

TGGT wire is widely specified for internal wiring in commercial and industrial equipment operating under severe heat. Typical uses include industrial and commercial ovens, furnaces, kilns, commercial cooking and drying equipment, heater leads, and severe hot-spot wiring in steel, glass, and paper processing facilities.

TGGT wire uses a multi-layer insulation design over flexible stranded nickel-plated copper conductors (which resist high-temp oxidation):

  • Inner Layer: PTFE (Teflon) tape wrap for electrical insulation and fluid resistance.
  • Middle Layer: Multiple wrapped layers of fiberglass yarn for thermal insulation and flexibility.
  • Outer Jacket: Heavy-duty, treated fiberglass braid (often impregnated with PTFE) for mechanical abrasion resistance.

Yes! Wire America custom cuts your order by the foot so you buy only the exact footage your job requires. For custom cut lengths, engineering submittal sheets, or bulk spool pricing, order online or call our sales team directly at (833) 268-8644.

Choose TGGT (250°C) when your high-heat application involves moisture, oils, or chemical exposure, as its PTFE layers create a tight liquid-resistant barrier. Choose MGT (Mica Glass) wire when operating temperatures exceed 250°C (MGT is rated for dry heat up to 450°C or 550°C), though MGT is generally not suited for wet or oil-rich environments.

Yes. Unlike standard fiberglass-insulated wires that absorb liquids, TGGT features an inner PTFE (Teflon) seal and a PTFE-impregnated outer fiberglass braid. This combination prevents moisture, oils, aggressive cleaning solvents, and corrosive vapors from penetrating to the conductor.

TGGT wire meets stringent Underwriters Laboratories specifications for high-temperature Appliance Wiring Material (AWM). Common UL styles include UL 5196 (600V, 250°C), UL 5256 (600V, 250°C), UL 5214 (600V, 250°C), UL 5251 (600V, 250°C), and UL 5180 (300V, 200°C/250°C).

Selecting the correct gauge depends on your equipment's total amperage draw and ambient operating temperature. Because high-temperature insulations handle more thermal stress, TGGT wire can carry higher current loads than standard 90°C PVC wire of the same gauge. Always consult high-temperature ampacity derating tables or local electrical codes when sizing conductors.

Standard bare copper oxidizes rapidly when continuously exposed to temperatures above 150°C, causing conductor degradation and electrical resistance build-up. Nickel plating acts as a protective shield, preventing copper oxidation and maintaining stable electrical conductivity up to 250°C.

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Industrial TGGT High-Temp Wire Technical Overview

Looking for a reliable US supplier that sells TGGT high-temp lead wire by the foot? Wire America is the #1 supplier for industrial-grade Type TGGT 250°C High Temperature Wire.  We provide heavy duty, extreme-heat single conductor lead wires cut to your exact length with fast shipping to keep your projects moving on time.  No master reels required, no wasted scrap material—just the exact footage your job requires.

TGGT wire is the "workhorse" of the high-heat electrical industry, offering a perfect balance of flexibility, moisture resistance, and extreme thermal stability. Rated for 250°C (482°F), it is specifically designed to outperform standard silicone wires in environments where chemicals, steam, or mechanical abrasion are present.  This high-temp wire carries a UL listing of UL 5256 & UL 5251.



Key Features
  • Triple-Layer Thermal Barrier: The unique "Teflon-Glass-Glass-Teflon" construction provides multiple layers of defense against heat soak and electrical leakage.
  • Superior Chemical & Moisture Resistance: The internal PTFE (Teflon) tape wrap acts as a longitudinal moisture barrier, protecting the conductors from oils, acids, and humidity.
  • Flexible Nickel-Plated Copper: Features stranded nickel-plated copper conductors that remain highly conductive and resist becoming brittle at a constant 250°C.
  • High-Strength Fiberglass Jacket: The outer treated fiberglass braid is engineered to resist fraying during difficult pulls through industrial conduits.
  • 600V Power Rating: Suitable for both low-voltage control signals and high-voltage power leads in heavy machinery.
Common Applications
  • Commercial Kitchen Equipment: The standard choice for internal wiring in commercial fryers, ovens, and steam tables.
  • Plastic Extrusion & Injection Molding: Provides reliable power to heating bands and barrels in plastic manufacturing.
  • Industrial Drying & Curing: Used in specialized paint booths and curing ovens that require constant high-heat operation.
  • Heater Lead Wire: The preferred lead wire for cartridge heaters, strip heaters, and band heaters.
  • Aerospace & Heat Treating: Deployed in environments requiring lightweight yet ultra-durable high-heat cabling.
Installation Note
  • TGGT is optimized for environments up to 250°C. For extreme-heat applications exceeding this limit, such as blast furnaces or ceramic kilns, you must upgrade to Type MG (Mica Glass) wire, which is rated for 450°C. If your application requires high flexibility at lower temperatures (up to 200°C), SRML is a cost-effective alternative.