Technical Guide
Fiberglass vs Silicone Cable for High-Heat Applications
Both are 'high temperature' wires, but they solve different problems. Fiberglass handles the hottest zones; silicone gives flexibility and moisture resistance at moderate heat.
| Property | Fiberglass insulated | Silicone rubber |
|---|---|---|
| Continuous temperature | Approx. 350°C – 450°C (grade dependent) | Approx. -60°C to 180°C (200°C select grades) |
| Flexibility | Moderate; stiffer with SS braid | Excellent, very soft and flexible |
| Moisture / oil resistance | Low — braided fiber absorbs moisture | Good — sealed rubber insulation |
| Abrasion resistance | Good with SS braiding | Moderate; add fiberglass braid if needed |
| Typical conductors | Copper, NPC, SS+Copper, Pure Nickel | Bare or tinned copper |
| Best for | Furnaces, kilns, heating elements, foundries | Heaters, motors, lighting, appliances, wet areas |
Choose fiberglass when…
- The cable sits directly in or next to a heat source above 200°C.
- You need NPC or pure nickel conductors to resist oxidation at high heat.
- Mechanical protection matters — SS braiding is available.
Choose silicone when…
- Temperatures stay below about 180°C but the wire must bend often.
- Moisture, steam, or washdown is present.
- You need neat routing inside panels, appliances or motors.
Common mistake
Using silicone wire in a furnace zone because it is "high temp". It will harden and crack above its rating. Measure the actual surface temperature where the cable runs, then add a safety margin before selecting.
Figures above are typical. Your generated TDS and the batch MTC confirm the exact rating for your order.
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