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Solid THHN/THWN-2 WireFrom $0.20/ft -
Solid THHN/THWN-2 WireFrom $0.20/ft - Solid THHN/THWN-2 WireFrom $0.20/ft
- Solid THHN/THWN-2 WireFrom $0.20/ft
Parent SKU : MG450-18
SKU : MG450-18-250
"A premier thermal solution for extreme environments, engineered with mica-glass composite insulation for maximum reliability in temperatures up to 450°C."
The 18 AWG MG (Mica-Glass) wire is engineered for the most extreme thermal environments on earth, where even PTFE-based wires (like TGGT) reach their limits. MG wire is the gold standard for internal wiring in industrial kilns, glass plants, cement manufacturing, and heavy-duty smelting equipment. By using a Mica-Glass composite insulation and a 27 % Nickel-Coated Copper conductor, it offers structural integrity and electrical safety at temperatures up to 450°C.
450°C Thermal Performance: Rated for continuous operation in environments reaching 842°F, providing unmatched safety for extreme-heat industrial zones.
Mica-Glass Insulation: The mica tapes provide superior dielectric strength and thermal resistance compared to standard plastic or silicone insulators.
Nickel-Coated Copper Conductor: Features high-quality nickel plating to prevent conductor oxidation and embrittlement, ensuring a long service life under constant extreme thermal stress.
Fiberglass Braid Protection: The outer jacket is treated with a high-temperature saturant, providing rugged resistance against abrasion and flame.
ENGINEERING OVERVIEW: 18 AWG MG 600V
APPLICATION: Industrial kilns, furnaces, glass plants, cement manufacturing, and extreme-heat processing equipment.
VOLTAGE: 600 Volts.
UL LISTING: UL 5107 / UL 5359.
CONDUCTORS: Flexible (16 strands) stranded soft drawn 27% nickel coated copper conductors per ASTM B355, B8, B173 and B174
INSULATION: Two layers of fiberglass-reinforced mica tape.
JACKET: Braided fiberglass treated with high-temperature saturant.
TEMPERATURE: 450°C (842°F).
NOMINAL OD: 0.115 inches (2.92 mm)
Industrial Kiln Wiring: Power leads for extreme-heat ceramic and glass kilns.
Smelting & Foundry: Wiring for equipment operating near molten metal and blast furnace heat.
Cement Manufacturing: Reliable circuits for heavy-duty rotary kilns and heat-intensive processing.
Heat-Treating Furnaces: Providing internal power for high-temperature atmosphere furnaces.
Extreme-Heat Appliances: Used in specialized commercial appliances where heat exceeds the limitations of standard Teflon/Glass wires.
Technical Note: All values are nominal and subject to industry tolerances and manufacturer corrections. Specifications are subject to change without notice. It is the buyer’s responsibility to verify that all materials meet the specific requirements of the project and comply with local electrical codes.
| Wire Size (AWG/MCM) | 18 AWG |
| Conductor Material | Nickel Plated Copper |
| Conductor Type | Stranded |
| Strand Count | 16 |
| Outer Diameter (OD) (in/mm) | 0.115 in. / 2.92 mm |
| Jacket Type | Fiberglass braid with a high temperature finish |
| Conductor Count | 1 |
| Shield | Unshielded |
| Insulation Type | Glass Reinforced Mica Tape |
| UL Listing Numbers | UL 5017, UL 5359 |
| Voltage Rating | 600V |
| Submersible | No |
| Temperature Rating | 450ºC |
| Standards | UL Style 5107, 5359 CSA AWM A/B FT-1 |
| Miscellaneous Information | The data shown are approximate and subject to standard industry and manufacturer tolerances |
| Primary Applications | Industrial Ovens, Furnaces, Kilns, Commercial Cooking Equipment, Heating Elements, Electric Heaters, Hot Spot Wiring, and Lighting and Appliances. |
| Weight per Foot | 0.012 lb |
In-stock orders placed before 3pm EST typically ship within 1-2 business days. Our business days are Monday through Friday; we do not process orders on Saturday, Sunday, or major US Holidays.
You will receive an e-mail with a tracking number within 1-2 business days from the time its shipped. You will also be able to view your order status and tracking numbers in your account order history.
Expedited shipments are delivered Monday-Friday except on US Holidays. The order must be placed before 12pm CST to ship same day ( Mon-Fri Only).
You have 30 days from the day you receive the item to contact us for a return. Returns are subject to a 30% Restocking Fee.
Please contact us at help@wireamerica.com to request a return authorization. Have your order number or name the order was placed with ready and we will email you an RMA (return) number and instructions for return. Currently, we do not offer exchanges. A new order must be placed if you need a different item. If you provide the new order number at the time of your return request, the restocking fee may be lowered.
Orders on any items with a material value of $50 or less are non-returnable.
Parent SKU : MG450-18
SKU : MG450-18-250
Parent SKU : MG450-18
SKU : MG450-18-250
"A premier thermal solution for extreme environments, engineered with mica-glass composite insulation for maximum reliability in temperatures up to 450°C."
The 18 AWG MG (Mica-Glass) wire is engineered for the most extreme thermal environments on earth, where even PTFE-based wires (like TGGT) reach their limits. MG wire is the gold standard for internal wiring in industrial kilns, glass plants, cement manufacturing, and heavy-duty smelting equipment. By using a Mica-Glass composite insulation and a 27 % Nickel-Coated Copper conductor, it offers structural integrity and electrical safety at temperatures up to 450°C.
450°C Thermal Performance: Rated for continuous operation in environments reaching 842°F, providing unmatched safety for extreme-heat industrial zones.
Mica-Glass Insulation: The mica tapes provide superior dielectric strength and thermal resistance compared to standard plastic or silicone insulators.
Nickel-Coated Copper Conductor: Features high-quality nickel plating to prevent conductor oxidation and embrittlement, ensuring a long service life under constant extreme thermal stress.
Fiberglass Braid Protection: The outer jacket is treated with a high-temperature saturant, providing rugged resistance against abrasion and flame.
ENGINEERING OVERVIEW: 18 AWG MG 600V
APPLICATION: Industrial kilns, furnaces, glass plants, cement manufacturing, and extreme-heat processing equipment.
VOLTAGE: 600 Volts.
UL LISTING: UL 5107 / UL 5359.
CONDUCTORS: Flexible (16 strands) stranded soft drawn 27% nickel coated copper conductors per ASTM B355, B8, B173 and B174
INSULATION: Two layers of fiberglass-reinforced mica tape.
JACKET: Braided fiberglass treated with high-temperature saturant.
TEMPERATURE: 450°C (842°F).
NOMINAL OD: 0.115 inches (2.92 mm)
Industrial Kiln Wiring: Power leads for extreme-heat ceramic and glass kilns.
Smelting & Foundry: Wiring for equipment operating near molten metal and blast furnace heat.
Cement Manufacturing: Reliable circuits for heavy-duty rotary kilns and heat-intensive processing.
Heat-Treating Furnaces: Providing internal power for high-temperature atmosphere furnaces.
Extreme-Heat Appliances: Used in specialized commercial appliances where heat exceeds the limitations of standard Teflon/Glass wires.
Technical Note: All values are nominal and subject to industry tolerances and manufacturer corrections. Specifications are subject to change without notice. It is the buyer’s responsibility to verify that all materials meet the specific requirements of the project and comply with local electrical codes.
| Wire Size (AWG/MCM) | 18 AWG |
| Conductor Material | Nickel Plated Copper |
| Conductor Type | Stranded |
| Strand Count | 16 |
| Outer Diameter (OD) (in/mm) | 0.115 in. / 2.92 mm |
| Jacket Type | Fiberglass braid with a high temperature finish |
| Conductor Count | 1 |
| Shield | Unshielded |
| Insulation Type | Glass Reinforced Mica Tape |
| UL Listing Numbers | UL 5017, UL 5359 |
| Voltage Rating | 600V |
| Submersible | No |
| Temperature Rating | 450ºC |
| Standards | UL Style 5107, 5359 CSA AWM A/B FT-1 |
| Miscellaneous Information | The data shown are approximate and subject to standard industry and manufacturer tolerances |
| Primary Applications | Industrial Ovens, Furnaces, Kilns, Commercial Cooking Equipment, Heating Elements, Electric Heaters, Hot Spot Wiring, and Lighting and Appliances. |
| Weight per Foot | 0.012 lb |
In-stock orders placed before 3pm EST typically ship within 1-2 business days. Our business days are Monday through Friday; we do not process orders on Saturday, Sunday, or major US Holidays.
You will receive an e-mail with a tracking number within 1-2 business days from the time its shipped. You will also be able to view your order status and tracking numbers in your account order history.
Expedited shipments are delivered Monday-Friday except on US Holidays. The order must be placed before 12pm CST to ship same day ( Mon-Fri Only).
You have 30 days from the day you receive the item to contact us for a return. Returns are subject to a 30% Restocking Fee.
Please contact us at help@wireamerica.com to request a return authorization. Have your order number or name the order was placed with ready and we will email you an RMA (return) number and instructions for return. Currently, we do not offer exchanges. A new order must be placed if you need a different item. If you provide the new order number at the time of your return request, the restocking fee may be lowered.
Orders on any items with a material value of $50 or less are non-returnable.
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Physical Specifications
Technical Specifications
Usage & Installation:
Packaging & Dimensions:
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MG wire stands for Mica-Glass. It is an extreme-temperature lead wire engineered to withstand continuous operating temperatures up to 450°C (842°F) and short-term thermal spikes up to 550°C (1022°F). The name describes its rugged construction: a flexible 27% nickel-coated copper conductor wrapped in high-dielectric Mica composite tapes, protected by a heavy-duty fiberglass braid jacket treated with a high-temperature finish.
Yes, our MG (Mica-Glass) wire is fully UL Style 5359 rated. UL 5359 is the official Underwriters Laboratories standard for single-conductor appliance wiring material (AWM) certified for use up to 450°C (842°F) and 600 volts. This classification ensures the wire has passed strict thermal, electrical, and flame-propagation testing required for heavy-duty industrial heating equipment, commercial ovens, and furnace control systems.
At temperatures approaching 450°C, standard copper—or even lower-grade plated copper—will oxidize and fail. The 27% nickel coating acts as a permanent shield, maintaining the conductor’s flexibility and conductivity in the most intense heat found in modern industrial applications.
MG wire is rated for continuous operation at temperatures up to 450°C (842°F), with a non-UL maximum rating of up to 538°C in specific applications.
"Better" depends on your application. TGGT (250°C) is the standard for commercial appliances and heaters. MG (450°C) is specifically for "extreme" industrial zones. Using MG for a standard 200°C application is often unnecessary, but it is the required choice for kilns, furnaces, and smelters.
Because MG uses mica tapes and multiple layers of glass, it is less flexible than SRML or TGGT. It is intended for fixed wiring inside heavy equipment where extreme heat is the primary concern, rather than frequent movement.
Yes. The outer fiberglass braid is impregnated with a high-temperature saturant that provides moisture resistance. However, like all high-heat mica-based wires, it is designed primarily for dry, extreme-heat environments.
Yes. We carry a comprehensive range of high-temperature wire, including SIS (125°C) SRML (200°C), TGGT (250°C), and MG (450°C). Each product page includes detailed engineering specs, such as strand counts and UL listings. To view our complete inventory or download full spec sheets for every size we carry, please visit our Full High-Temperature Wire Collection here.
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