Mica tape for fire resistant cables is the critical inorganic fire-survival barrier that enables modern fire-rated cables to maintain electrical continuity under direct flame exposure. Unlike organic insulation materials that carbonize and fail, mica tape forms a stable, non-combustible ceramic-like layer around the conductor, preserving dielectric strength at temperatures of 750°C to 1050°C for periods of 90 to 180 minutes.
The tape is manufactured by bonding high-quality mica paper (phlogopite, calcined muscovite or synthetic) to an electrical-grade alkali-free glass cloth (single or double sided) or polyethylene film using a specially formulated high-temperature silicone resin. After impregnation, curing and precision slitting, the resulting flexible composite delivers excellent tensile strength, uniform thickness and high-speed wrapping performance on modern cable production lines.
Key Construction
- Core: Phlogopite, synthetic or calcined muscovite mica paper (mica content typically 60–85% or 80–160 g/m² depending on grade)
- Reinforcement: Alkali-free glass fiber cloth (single-side or double-side) or PE film
- Binder: High-temperature silicone resin (halogen-free)
- Orientation: Mica side faces the conductor for maximum insulation performance during fire
Types of Mica Tape and Temperature Performance
| يكتب | Typical Flame Temperature | المزايا الرئيسية | Common Applications |
|---|
| Phlogopite Mica Tape | 750–900°C | Excellent thermal stability, cost-effective, industry standard | Power cables, control cables, general fire-resistant constructions |
| Synthetic Mica Tape | 950–1050°C | Superior high-temperature endurance, higher dielectric strength | Critical safety systems, nuclear, high-rise emergency circuits |
| Calcined Muscovite Mica Tape | 900–1000°C | Enhanced structure after calcination, balanced performance | Marine, offshore, and high-voltage fire-rated cables |
Typical Technical Specifications
| المعلمة | Typical Range | Test Reference |
|---|
| Thickness | 0.08–0.16 mm (±0.015 mm) | ISO 9073-2 / IEC 60371 |
| Total Weight | 125–225 g/m² | — |
| Mica Content | 80–160 g/m² or >60–85% | — |
| Glass Cloth Content | 24–42 g/m² | — |
| قوة الشد | >100–200 N/cm or ≥125 N/15 mm | ISO 9073-3 |
| Breakdown Voltage | >1.0–3.0 kV/layer | IEC 371-2 / DIN 53482 |
| Fire Performance | 90–180 min at 750–1050°C, 0.6/1 kV | IEC 60331, BS 6387 C/W/Z |
| Insulation Resistance | >500 MΩ | — |
| Halogen Content | Zero | IEC 60754 |
| Continuous Length | Up to 2000–30 000 m (pad or spool) | — |
Custom widths (typically 5–1000 mm), lengths, single/double-sided glass, and film-backed constructions are available to match specific conductor diameters and production line speeds (high-speed wrapping up to 70 m/min possible with optimized grades).
المزايا التقنية الرئيسية وفوائد الأداء
- Unmatched Fire Resistance & Circuit Integrity — Maintains dielectric strength and prevents conductor exposure even at 750–1000°C, enabling cables to pass IEC 60331 and BS 6387 CWZ tests for 90–180 minutes.
- High Dielectric Strength & Electrical Insulation — Excellent isolation properties (verified >1.0–1.8 kV per layer depending on grade and thickness) ensure reliable performance under both normal and emergency conditions.
- Superior Flexibility & Processability — High tensile strength combined with excellent elongation supports smooth longitudinal or helical wrapping (recommended 25–50% overlap) on high-speed cable production lines without cracking or delamination.
- Low Smoke & Halogen-Free Performance — Particularly in calcined grades, the tape produces minimal smoke and no corrosive halogen gases, supporting safe evacuation and reducing secondary damage.
- Thermal & Environmental Stability — Short-term resistance up to 1000°C+; long-term operating temperature 90–180°C (grade dependent). Outstanding resistance to moisture, chemicals, corona, and radiation.
- Lightweight & Cost-Effective — Thin, consistent profile (0.08–0.14 mm) adds minimal weight while delivering maximum protection for both standard and specialty fire-resistant cable designs.
Thermal & Environmental Stability
- Short-term resistance: Up to 1000°C+
- Long-term operating temperature: 90–180°C (depending on grade)
- Outstanding resistance to moisture, chemicals, corona, and radiation
Lightweight & Cost-Effective Thin profile (0.08–0.15 mm) adds minimal weight while delivering maximum protection, making it ideal for both standard and specialty fire-resistant cable designs.
Primary Applications in Fire-Resistant Cable Systems
Mica Cable Tape is applied as the primary fire-resistant insulation layer directly over conductors or between insulation and sheath in:
- Fire-resistant power cables (emergency power supply)
- Control and instrumentation cables
- Emergency lighting and evacuation systems
- Shipboard, offshore, and marine cables
- Nuclear power plant cables
- High-rise buildings, subways, tunnels, and data centers
It is typically used in combination with XLPE or silicone rubber insulation and low-smoke zero-halogen (LSZH) sheaths to achieve full compliance with fire safety regulations.
المواصفات الفنية
Single-Side Glass Fiber Cloth Backed Mica Tape
| يكتب | Thickness (mm) | Quantitative (g/m²) | Mica Content (g/m²) | Glass Fiber Content (g/m²) | Bond Content (g/m²) | Dielectric Strength (kV/layer) | Tensile Strength (N/cm) |
|---|
| Calcined Mica Tape | 0.12 ± 0.015 | 158 ± 12 | 100 ± 5 | 32 ± 3 | 26 ± 4 | >1.5 | >120 |
| Calcined Mica Tape | 0.14 ± 0.015 | 181 ± 12 | 120 ± 5 | 32 ± 3 | 29 ± 4 | >1.8 | >120 |
| Phlogopite Mica Tape | 0.08 ± 0.015 | 117 ± 11 | 80 ± 5 | 24 ± 3 | 13 ± 3 | >1.0 | >80 |
| Phlogopite Mica Tape | 0.12 ± 0.015 | 172 ± 11 | 120 ± 5 | 32 ± 3 | 20 ± 3 | >1.2 | >120 |
| Phlogopite Mica Tape | 0.14 ± 0.015 | 216 ± 14 | 160 ± 8 | 32 ± 3 | 24 ± 3 | >1.4 | >120 |
Notes:
- Quantitative = total mass per unit area (ensures batch-to-batch consistency).
- Mica Content = primary inorganic fire-resistant component.
- All values are typical production data. Custom thicknesses, widths (6–1000 mm), mica content, single/double-side configurations, and glass/PE backing options are available to match exact fire-resistance class (e.g., BS 6387 CWZ) and cable design requirements.
| المعلمة | Phlogopite Mica Tape | Calcined Mica Tape | شروط الاختبار / المعيار |
|---|
| Mica Content | ≥55% | ≥60% | High fire resistance |
| Substrate | Glass fabric / PE film | Alkali-free glass fiber cloth | High mechanical strength |
| Impregnation | Silicone resin | Silicone resin | Thermal stability |
| Thickness | 0.08–0.15 mm | 0.08–0.15 mm | التقطيع الدقيق |
| Width | 6–1000 mm | 6–1000 mm | Custom available |
| Fire Resistance | IEC 60331, BS 6387 | IEC 60331, BS 6387 | Circuit integrity |
| Temperature Resistance | ممتاز | متفوق | Long-term stability |
(Custom thicknesses, widths, and mica content available to match exact fire-resistance class and cable design.)
Custom thicknesses, widths, mica content, single/double-side, and glass/PE backing options are available to match exact fire-resistance class (e.g., BS 6387 CWZ) and cable design.
Which International Standards and Recent Updates Govern Mica-Taped Fire-Resistant Cables?
Key standards in force 2025–2026:
- IEC 60331-1 / -2 / -21: flame + mechanical shock at 750–830 °C, 90–120 min circuit integrity.
- BS 6387: Categories C (950 °C / 3 h), W (fire + water) and Z (fire + shock).
- EN 50200 / BS EN 50200: PH30 / PH60 / PH120 ratings for small cables, including Annex E water-spray option.
- AS/NZS 3013: WS52W classification (120 min circuit integrity + water).
- GB/T 5019.4-2025 (China, implemented February 2026): updated mica-paper requirements aligned with IEC 60371.
- EU CPR (EU) 2024/3110 and related delegated acts: reaction-to-fire classes for cables used in construction works.
Recent industry data (2024–2026) show increasing adoption of ultra-thin synthetic mica tapes (<0.10 mm) to support higher packing density and high-speed manufacturing while still meeting the elevated temperature requirements of the latest revisions.
How Should Mica Tape Be Selected and Applied According to Cable Design?
Selection logic follows the target fire-test standard and conductor size:
- IEC 60331-1 / -2 (830 °C, 90–120 min + shock): 0.12–0.14 mm phlogopite or synthetic, 50 % overlap (minimum two layers effective).
- BS 6387 Category C (950 °C, 180 min): 0.14–0.16 mm synthetic preferred; double wrapping recommended.
- BS 6387 CWZ or EN 50200 + water spray: synthetic mica or high-mica-content phlogopite with ≥50 % overlap and mica face toward the conductor.
- Small conductors (≤2.5 mm²): thinner, more flexible grades with higher tensile strength to avoid breakage during wrapping.
Wrapping direction (same or opposite) and overlap ratio directly affect pass rate. Independent studies show that 50 % overlap (four effective layers) combined with phlogopite or synthetic mica consistently achieves the highest WS5XW / CWZ ratings, while butt-wrap or muscovite constructions frequently fail.
Round compacted conductors are preferred over flexible bunched conductors because the smoother surface reduces local stress and delamination risk during extrusion.
التعبئة والتغليف والخدمات اللوجستية
Available in coil or roll form for efficient global supply:
- Coil/Pad: Width 6–1000 mm, length 500–2000 m, inner diameter 52/76 mm, outer diameter up to 560 mm
- Spool: Narrow widths (5–20 mm) with lengths up to 30,000 m for high-speed continuous production
- Secure wooden case or pallet packaging ensures safe worldwide transportation and storage
Why Choose a Reliable Technical Partner
As an experienced supplier focused on cable materials, we emphasize consistent mica content, uniform resin distribution, precise thickness control and batch-to-batch stability. We support customers with technical data sheets, wrapping recommendations, sample evaluation and custom development to optimize both fire performance and production efficiency.
استفسر الآن for detailed technical data sheets, current stock grades, custom width/thickness quotations, or free samples for your fire-resistant cable projects. Our engineering team is ready to discuss your specific conductor size, voltage rating and target fire test requirements to deliver the most suitable mica tape solution.
Long-term cooperation based on reliable quality, responsive technical support and consistent supply is our commitment to cable manufacturers worldwide.
Fire Resistant Cable Mica Tape – Doing Cable Material
High-performance mica tape for fire resistant cables. Phlogopite & synthetic options withstand 750–1050°C, pass IEC 60331 & BS 6387. Flexible, high-tensile, zero-halogen insulation for fire-survival power & control cables. Custom specs available. Inquiry Now for technical data and samples.
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