Heat Resistant Silicone Cable
Heat resistant silicone cable is a multi-core flexible cable engineered for power supply and control wiring in applications where sustained high ambient temperature, thermal cycling, or proximity to heat sources would cause standard PVC-sheathed cable to harden, crack, and fail prematurely. Built with individually silicone-insulated cores and an overall silicone rubber outer sheath, it maintains full flexibility and electrical integrity from –60°C through to a continuous operating temperature of 200°C — a performance range that no PVC, XLPE, or rubber alternative can match.
The silicone rubber insulation will not harden, embrittle, or crack with age regardless of the thermal environment — a fundamental material difference from PVC, which undergoes irreversible thermal degradation above 70°C and becomes brittle in cold environments below –15°C. A heat resistant silicone cable installed correctly in a high-temperature environment can be expected to outlast PVC-sheathed cable by a factor of five to ten in continuous high-ambient-temperature service.
Individual core insulation is produced under UL AWM Style 3135 (200°C, 600V AC) at our Yangzhou facility under UL Follow-Up Service File No. E333030, providing internationally verified performance for UL-specification projects.
Technical Specifications
| Parameter | Specification |
|---|---|
| Conductor material | Tinned copper, Class 5 flexible stranded |
| Core insulation | Extruded silicone rubber (VMQ), UL AWM Style 3135 |
| Outer sheath | Extruded silicone rubber (VMQ) |
| Temperature rating | –60°C to 200°C continuous |
| Voltage rating | 300V AC (multi-core) / 600V AC (single core ref.) |
| Available core counts | 2, 3, 4, 5, 6, 7, 8, 10, 12 cores |
| Available cross-sections | 0.5 mm² – 95 mm² per core |
| Core identification | IEC colour code or numbered black cores |
| Insulation thickness (small AWG) | 30 mils min avg / 27 mils min at any point (UL 3135) |
| Flame rating | UL VW-1, IEC 60332-1 horizontal flame |
| Standard | UL AWM 3135 (File E333030), IEC 60245, GB/T 12528, RoHS |
| Sheath colour | Red (standard), black, grey, custom |
| Packaging | 25 m / 50 m / 100 m coils, custom drum lengths |
Core Count & Cross-Section Reference
| Configuration | Cross-section per core | Approx. OD (mm) | Current capacity (A, free air) |
|---|---|---|---|
| 2 core | 1.5 mm² | 11.5 | 17 |
| 3 core | 2.5 mm² | 13.5 | 23 |
| 4 core | 1.5 mm² | 13.5 | 17 |
| 5 core | 1.5 mm² | 15.0 | 17 |
| 3 core | 10 mm² | 22.0 | 52 |
| 3 core | 25 mm² | 32.0 | 89 |
| 3 core | 50 mm² | 43.0 | 130 |
| 3 core | 95 mm² | 56.0 | 191 |
Key Features
Thermal & electrical
- –60°C to 200°C continuous operating range
- UL AWM 3135 recognised — 200°C, 600V (File E333030)
- Insulation does not harden or crack with age or heat
- Passes UL VW-1 and IEC 60332-1 flame test
- Low dielectric loss — suitable for power and signal circuits
Mechanical & chemical
- Class 5 tinned copper — flexible, corrosion resistant
- Silicone outer sheath — oil, ozone, and UV resistant
- Remains fully flexible at –60°C
- Suitable for repeated thermal cycling
- RoHS compliant — halogen-free silicone insulation
- Multi-core with silicone outer sheath — complete cable for external connection leads, unlike single-core wire
- 2 to 12 cores, 0.5–95 mm² — covers control, power, and combined circuit requirements in a single cable
- Short lengths from 5 m — suitable for equipment connection lead replacement and OEM assembly
Common Applications
Industrial oven and furnace connections
The primary use case for heat resistant silicone cable is as the external flexible power feed to industrial ovens, kilns, heat-sealing machines, and continuous process ovens. The cable enters through the oven enclosure gland, where the silicone sheath withstands contact temperatures that would cause PVC outer sheaths to soften and deform within weeks of installation.
Motor connection leads in hot environments
Used as the short connection lead between motor terminal boxes and variable speed drives or starter panels in boiler rooms, conveyor ovens, and locations adjacent to process heating equipment where PVC-sheathed cable would exceed its temperature limit rapidly.
Industrial machinery power and control
Specified for wiring runs on industrial machinery operating in high-ambient-temperature environments — food processing lines, foundry equipment, and glass manufacturing machinery — where both power supply and control signal cores are required in a single cable and the ambient temperature exceeds 70°C continuously.
Other applications
- Transformer and reactor connection leads in hot electrical rooms
- Welding equipment secondary supply and control leads
- Marine engine room power and control cabling
- Battery pack wiring in high-temperature environments
Heat Resistant Silicone Cable vs. Standard PVC Flexible Cable
| Property | Heat resistant silicone cable | Standard PVC flexible cable |
|---|---|---|
| Max continuous temperature | 200°C | 70°C (105°C special grade) |
| Min temperature (flexibility) | –60°C | –15°C |
| Insulation ageing | No hardening over service life | Hardens and cracks with heat and age |
| Chemical resistance | Excellent — oils, ozone, UV | Moderate |
| Halogen content | Halogen-free | Contains chlorine (PVC) |
| Cost | Higher | Lower |
Ordering Information
Select core count, cross-section per core, sheath colour, and length. Screened constructions and armoured variants available from 200 m MOQ. UL AWM Style 3135 documentation available on request.
Short lengths from 5 m available. Contact us for pricing and lead times within 24 hours.
Why Choose CableApex
CableApex supplies heat resistant silicone cable produced on dedicated silicone extrusion lines with 100% online spark testing at 4 kV and continuous outer diameter monitoring. Silicone core insulation is produced under UL Follow-Up Service (File No. E333030, Style 3135). We supply to oven and furnace manufacturers, industrial machinery OEMs, electrical contractors, and distributors across more than 40 countries.
