Standard PVC or XLPE insulation breaks down above 90–105 °C. For steel mills, glass factories, power plants, and semiconductor fabs, you need cable built for sustained heat. Here are the five most widely used types, ranked from general-purpose to extreme-heat specialist.
Silicone Rubber Insulated Cable
Temperature range: −60 °C to +200 °C
The most popular high-temperature option — excellent balance of heat resistance, flexibility, and cost. Stays supple across its full range and resists UV, ozone, and moisture.
Typical Applications
- Kitchen and food-processing ovens
- Commercial lighting fixtures
- Medical sterilization equipment
- Motor leads in HVAC systems
Why it stands out: Best combination of thermal range, flexibility, and price below 200 °C.
Fiberglass Braided Cable
Temperature range: +200 °C to +400 °C
Woven glass-fiber insulation over the conductor, sometimes with an inner silicone or mica layer. Handles temperatures well above silicone and adds mechanical toughness.
Typical Applications
- Furnace and kiln wiring
- Industrial heater connections
- Foundry sensor leads
- High-temperature motor windings
Why it stands out: Most cost-effective way to push above 200 °C with good abrasion resistance.
PTFE (Teflon®) Insulated Cable
Temperature range: −200 °C to +260 °C
Chemically inert, thin-walled, and lightweight. Handles extreme heat and cold simultaneously and will not absorb moisture. Widely used in aerospace and semiconductor fabs.
Typical Applications
- Aerospace wiring harnesses
- Semiconductor fabrication tools
- Chemical processing plants
- Oil and gas downhole sensors
Why it stands out: Go-to choice when aggressive chemicals and extreme temperatures combine.
Mica Tape Wrapped Cable
Temperature range: +450 °C to +800 °C
Multiple overlapping layers of natural mica flakes around the conductor. Excellent electrical insulator at temperatures far beyond organic materials. Standard for fire-survival circuits.
Typical Applications
- Steel mill instrumentation
- Fire-survival circuits (IEC 60331)
- Thermocouple extension wiring
- Tunnel fire alarm circuits
Why it stands out: Only viable option between 400–800 °C; also provides fire circuit integrity.
Ceramic Fiber Insulated Cable
Temperature range: +800 °C to +1200 °C
The extreme end of high-temperature wiring. Nickel or nickel-chromium conductors insulated with woven ceramic fiber that maintains structure where most metals weaken.
Typical Applications
- Glass furnace heating elements
- Rocket engine test stands
- Heat treatment above 800 °C
- Platinum-resistance thermometer leads
Why it stands out: No alternative exists for continuous service above 800 °C.
How to Choose the Right High-Temperature Cable
Selecting the right cable requires answering four questions:
- What is the maximum continuous temperature? Match the cable’s rated temperature to the worst-case operating condition, with a safety margin of at least 10–20%.
- What chemicals will it contact? Silicone resists moisture and ozone but not hydrocarbon solvents. PTFE handles nearly everything. Choose accordingly.
- Does it need to flex repeatedly? Silicone and PTFE remain flexible. Fiberglass and mica-tape cables are semi-rigid and better suited for fixed installations.
- Is fire survival required? If the cable must maintain circuit integrity during a fire (IEC 60331), mica-tape construction is typically mandatory.
Quick Temperature Reference
| Temperature Zone | Recommended Cable Type |
|---|---|
| Up to 105 °C | Standard PVC or XLPE (no special cable needed) |
| 105–200 °C | Silicone rubber insulated cable |
| 200–260 °C | PTFE insulated cable |
| 200–400 °C | Fiberglass braided cable |
| 400–800 °C | Mica tape wrapped cable |
| 800–1,200 °C | Ceramic fiber insulated cable |
Summary
Silicone rubber handles most needs up to 200 °C. Beyond that, fiberglass, PTFE, mica tape, and ceramic fiber cover progressively hotter environments. Match the cable to your worst-case operating temperature with a 10–20% safety margin, then factor in flexibility, chemical exposure, and budget. Contact our team if you need help selecting the right type.