Fire Resistant Mica Tape Glass Fiber Braided Wire
Fire resistant mica tape glass fiber braided wire is an inorganic insulated high-temperature wire combining non-extruded mica tape insulation with a treated fiberglass braid outer covering. Unlike silicone rubber or PTFE-insulated wire, which use organic polymer insulation that degrades and eventually carbonises at extreme temperatures, mica tape insulation is a pure mineral construction with no organic components — it will not burn, will not carbonise, and will not lose its electrical insulating properties even when exposed to direct flame or temperatures approaching the melting point of glass.
This intrinsic fire resistance makes mica tape wire the specified choice for fire circuit integrity applications — wiring that must maintain electrical continuity and insulation integrity during a fire event, ensuring that safety-critical circuits (fire alarms, emergency lighting, emergency ventilation controls) remain operational when conventional wiring has failed. The treated fiberglass braid outer covering provides mechanical protection during installation and additional thermal mass, while the silicone varnish or PTFE treatment maintains flexibility and handling properties across the operating temperature range.
Produced at our Yangzhou facility under UL Follow-Up Service File No. E333030, this wire is recognised under UL AWM Styles 5107, 5128, and 5334 — covering temperature ratings from 200°C to 450°C and voltage ratings from 300V to 600V AC across the full AWG and kcmil range.
UL AWM Style Reference — Certified Specifications
| UL Style | Temp rating | Voltage | AWG range | Mica tape thickness (26–12 AWG) | Glass braid thickness |
|---|---|---|---|---|---|
| 5107 | 200°C or 450°C | 600V AC | 26 AWG – 550 kcmil | 25 mils min avg | 7 mils min avg (26–12 AWG) |
| 5128 | 450°C | 300V AC | 24 AWG – 4 AWG | 15 mils min avg | 7 mils min avg (24–12 AWG) |
| 5334 | 450°C | 300V AC | 24 AWG – 4 AWG | 17 mils min avg composite | 5 mils min avg (24–12 AWG) |
Reprinted from Product iQ with permission from UL Solutions. ©2026 UL LLC. File No. E333030, last updated 2025-12-01.
Technical Specifications
| Parameter | Specification |
|---|---|
| Temperature rating | 200°C (UL 5107 low temp grade) or 450°C (UL 5107 / 5128 / 5334) |
| Voltage rating | 300V AC (5128, 5334) or 600V AC (5107) |
| Conductor material | Solid or stranded copper (nickel-plated optional for highest temp grade) |
| AWG / kcmil range | 26 AWG – 550 kcmil (style dependent) |
| Insulation type | Non-extruded mica tape (multiple layers) |
| Outer covering | Treated fiberglass braid (silicone varnish or PTFE/TFE finish) |
| Optional shield | Stainless steel 304 braid (available on 5128 and 5334) |
| Flame rating | Horizontal flame |
| Fire resistance | Mica insulation maintains electrical integrity at direct flame exposure |
| UL file number | E333030 |
| Standard | UL AWM 5107 / 5128 / 5334, GB/T 13033, RoHS compliant |
| Packaging | 25 m / 50 m coils or cut to length |
Key Features
Fire resistance & thermal
- Mica tape insulation — no organic components, will not burn or carbonise
- Maintains electrical insulation integrity during direct flame exposure
- 200°C or 450°C continuous rated — full range from process equipment to extreme furnace wiring
- Dimensionally stable — no shrinkage or deformation at operating temperature
- No smoke or toxic fumes at operating temperature
Construction & compliance
- UL 5107, 5128, 5334 recognised — File No. E333030
- Treated fiberglass braid — silicone varnish or PTFE finish options
- Optional stainless steel braid for mechanical protection in extreme environments
- Assembly options — up to 1.5″ OD multi-conductor with mica glass binder
- RoHS compliant throughout
- Fire circuit integrity — maintains electrical continuity during fire where polymer-insulated cables fail, critical for emergency systems
- 26 AWG to 550 kcmil — covers signal-level control wiring through heavy power feeds in high-temperature equipment
- Multi-conductor assembly available — up to 1.5″ OD multi-conductor cables with mica glass binder and optional treated glass braid overall covering
- Not suitable for repeated flexing — mica tape insulation is designed for fixed static internal wiring; dynamic flex applications require silicone rubber wire
Common Applications
Fire circuit integrity wiring
Mica tape glass fiber wire is the specified construction for fire-rated electrical circuits that must maintain continuous operation during a building fire — including fire alarm system wiring, emergency lighting feeds, fire suppression system control wiring, and stairwell pressurisation fan power supplies. When a fire destroys conventional PVC or XLPE cabling, the mica insulation of this wire maintains electrical isolation and continuity, keeping safety systems operational during evacuation.
Industrial furnace and kiln internal wiring
Used for heating element lead connections, thermocouple wiring, and control signal leads inside industrial furnaces, ceramic kilns, and sintering furnaces operating at 300°C to 450°C, where no polymer-insulated alternative survives the continuous ambient temperature. The 450°C rating of UL 5107, 5128, and 5334 covers the most common industrial heat treatment and ceramic firing temperature ranges.
High-temperature equipment internal wiring
Specified for internal wiring of industrial ovens, infrared heating panels, heat-sealing machines, and any enclosed equipment where the internal ambient temperature during operation exceeds the 200°C practical limit of silicone rubber wire. The wire is installed in static positions — element terminal connections, temperature sensor leads, and control wiring — where it will not be flexed after installation.
Specialty power generation
Used in steam turbine generator excitation wiring, nuclear plant auxiliary systems, and high-temperature industrial generator sets where both high ambient temperature and fire resistance requirements must be met simultaneously — a combination that eliminates all non-mineral insulation options.
Other applications
- Oven and grill heating element wiring in commercial catering equipment
- Induction heating system internal wiring
- Pharmaceutical sterilisation equipment wiring
- Mine shaft and tunnel emergency circuit wiring
- Petrochemical plant fire-rated instrumentation wiring
Mica Tape Wire vs Silicone Rubber Wire — Choosing Correctly
| Criteria | Mica tape glass fiber wire (this product) | Silicone rubber wire (UL 3135) |
|---|---|---|
| Max temperature | 450°C (UL 5107 / 5128 / 5334) | 200°C (UL 3135) |
| Fire resistance | Maintains insulation integrity in direct flame | Burns and loses integrity in fire |
| Flexibility | Limited — static installation only | Excellent — suitable for dynamic flex |
| Insulation type | Inorganic mineral (mica) | Organic polymer (silicone rubber) |
| Smoke output in fire | None — mineral insulation | Low smoke but produces some combustion products |
| Best for | Fire circuits, extreme temp furnace wiring | High-temp flexible leads, motor connections |
Ordering Information
Specify UL style (5107, 5128, or 5334), temperature grade (200°C or 450°C), voltage rating (300V or 600V), AWG/kcmil size, and required length. Multi-conductor assemblies and optional stainless steel braid available from 200 m MOQ. Standard single-conductor sizes available from 10 m for sample and replacement orders.
UL 5107 / 5128 / 5334 compliance documentation available on request. Construction test reports, material conformance certificates, and UL recognition letters supplied with orders. Contact us for pricing within 24 hours.
Why Choose CableApex
CableApex manufactures fire resistant mica tape glass fiber wire under UL Follow-Up Service (File No. E333030) for Styles 5107, 5128, and 5334. Our mica tape is sourced from certified phlogopite mica suppliers and applied on dedicated winding lines with controlled tape overlap and tension. All production is tested for insulation resistance and dielectric withstand voltage. We supply to fire system integrators, furnace builders, industrial equipment OEMs, and specialist electrical contractors across more than 40 countries.
