MG - 450°C | 550°C

MG Wire, or Mica Glass Wire, is a specialized high-temperature electrical wire designed for extreme heat environments, typically featuring stranded nickel-plated copper conductors. Its core insulation is made from mica tape or a mica composite, renowned for its exceptional thermal stability and electrical insulating properties at high temperatures. An outer fiberglass braid, often treated for added protection, provides mechanical strength and enhanced flame resistance. With impressive temperature ratings, commonly 450°C (842°F) and sometimes higher, and generally rated for 300V or 600V, MG wire is widely used for internal wiring in commercial and industrial ovens, furnaces, kilns, and other "hot spot" applications where standard wires cannot perform.  Read our MG Wire Buyers Guide.

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Industrial Type MG Wire Technical Overview

Type MG (Mica Glass) wire is the ultimate solution for extreme-heat industrial environments where standard high-temp insulations like Silicone or TGGT fail. Engineered for continuous operation at 450°C (842°F) and capable of withstanding short-term "peak" exposure up to 550°C (1022°F), MG wire is designed for the most demanding thermal applications in heavy industry. Its unique construction of mica tape and fiberglass allows it to maintain electrical integrity in environments where other wires would melt or soften.

Key Features
  • Extreme Dielectric Strength: The mica tape insulation maintains a high dielectric constant even under intense thermal stress, preventing short circuits in kilns and furnaces.
  • Rugged Fiberglass Jacket: Protected by a heavy-duty fiberglass braid treated with a high-temperature saturant to resist fraying, chemicals, and abrasion.
  • Dual-Layer Insulation: Utilizes high-grade phlogopite mica paper tape backed by glass, providing a robust dielectric barrier that survives extreme thermal stress.
  • Nickel-Plated Conductor: Features stranded 27% nickel-plated copper to ensure long-term conductivity and prevent terminal failure in "hot spot" applications.
  • Flame & Chemical Resistance: The combination of mica and treated glass braid offers superior resistance to flames, moisture, and common industrial chemicals.
Common Applications
  • Industrial Furnaces & Smelters: The primary lead wire for foundries and steel mills where radiant heat is constant.
  • Commercial Cooking Equipment: Essential for internal wiring in industrial ovens, fryers, and high-heat commercial ranges.
  • Kilns & Ceramic Manufacturing: Reliable performance in ceramic kilns and glass-forming equipment.
  • Heating Element Leads: The preferred choice for connecting power to strip heaters, band heaters, and immersion heaters.
  • Laboratory & Scientific Equipment: Used in high-temperature testing chambers and specialized thermal analysis tools.
  • Sub-Panel Distribution: Ideal for feeding power to detached outbuildings or sheds that require a dedicated ground and neutral.
  • Agricultural Service Runs: Used in farming environments for powering remote utility poles or well-pump control centers.
Installation Note
  • Type MG wire is optimized for stagnant high-heat stability. If your project involves high-vibration environments or requires the cable to flex frequently at temperatures up to 250°C, TGGT wire may be a more suitable alternative. For fixed installations exceeding 250°C, MG remains the industry standard.

Resources & Guides

Category_Buying Guide
What is MG High Temp Wire?
December 02, 2025
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Category_Buying Guide
TGGT vs. MG: Which High-Temperature Wire Do You Need?
January 03, 2026
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Which High-Temp Wire Is Best? 125°C to 550°C Selection Guide
March 09, 2026
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