Detailed Description
Heat — The Accelerator of All Cable Failure Modes
Every cable failure mechanism is temperature-dependent. Heat accelerates chemical reactions, physical deformation, and electrical degradation:
| Failure Mode | Rate at +25 °C | Rate at +120 °C | Rate at +180 °C |
|---|---|---|---|
| PVC plasticizer loss | Baseline | 50× faster | 200× faster — fails in hours |
| EPR oxidation hardening | Baseline | 10× faster | 50× faster |
| CR jacket embrittlement | Baseline | 8× faster | 30× faster |
| Copper oxidation (bare) | Decades | 2–5 years | 6–12 months |
| Conductor resistance increase | Negligible | Noticeable | Significant — hot spots form |
At temperatures above +120 °C, standard industrial cable materials degrade at rates that make them unsuitable for continuous service. High-temperature reeling cables use fundamentally different materials — silicone rubber instead of PVC/EPR, CSPE/FEP instead of standard PUR/CR, and ceramic fiber instead of organic fillers.
The Three-Grade Insulation System
Rather than attempt one material for all high-temperature applications, we offer three insulation grades matched to the actual temperature:
Grade A — EPR (+120°C)
For applications at the upper limit of standard industrial requirements: steel mill crane bays at 10–15 m from the ladle, aluminum smelter pot rooms, heat treatment furnace peripheries. EPR with enhanced heat stabilizer formulation provides reliable performance without the cost of silicone.
Grade B — Silicone Rubber (+180°C)
For direct high-temperature exposure: foundry casting bay cranes within 5 m of molten metal, glass plant furnace charging machines, ceramic kiln cars. Silicone maintains its flexibility and dielectric properties at temperatures where EPR would oxidize and harden. The material is inherently halogen-free.
Grade C — FEP / PTFE (+250°C)
For extreme heat: close-proximity furnace applications, direct exposure to radiant heat sources, intermittent contact with hot surfaces. FEP (fluorinated ethylene propylene) is chemically inert, non-flammable, and maintains its properties to +250°C. Its melting point of +260°C provides a safety margin for intermittent excursions.
Mica Glass Tape — Fire Survival Circuit Integrity
For safety-critical applications (emergency crane operation, personnel evacuation, fire pump power), mica glass tape provides circuit integrity — the ability to maintain electrical function during a fire:
- Mica is a naturally occurring mineral that does not burn and has a melting point >1 300 °C
- Wrapped around individual conductors in a glass-fiber-reinforced tape
- When the organic insulation burns away, the mica tape remains as a continuous insulating barrier
- Tested per IEC 60331: maintains circuit integrity for 90+ minutes at +750 °C
Why Choose Yichi High-Temperature Reeling?
- Three-grade system: We match the insulation to your actual temperature — not under-specified (cable fails) or over-specified (unnecessary cost)
- Ceramic fiber thermal barrier: Reduces core temperature by 40–80 °C vs exposed construction — extends cable life 2–3×
- Conductor plating guidance: We specify bare, nickel, or silver based on your temperature and environment — not a catalog assumption
- Fire survival option: Mica glass tape for 90+ minute circuit integrity at +750 °C — for safety-critical applications
- Single-source responsibility: Conductor, insulation, thermal barrier, jacket, testing — all in-house. No subcontracting to unknown quality