Phlogopite Flexible Sheet
Phlogopite Flexible Sheet is a flexible mica sheet (grade 132-1P) made from Phlogopite Cogemica mica paper impregnated with a heat-resistant binder and polymerized by heat treatment, and is entirely free of asbestos. The material retains its intrinsic properties to 700°C in continuous service and 1000°C in intermittent service, with dielectric strength greater than 20 kV/mm. It is formable at room temperature and cuts cleanly by shearing or die-stamping.
Key Properties
- Thickness: 0.1 to 2 mm — Informative value
- Cogemica Content: 93-96% — IEC 371-2
- Heat Resistance, Continuous Service: 700°C
- Heat Resistance, Intermittent Service: 1000°C
- Dielectric Strength: >20 KV/mm — IEC 243-1 (23°C)
- Flame Resistance: V-0 — UL 94
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Physical Properties
| Property | Value | Test Method |
| Thickness | 0.1 to 2 mm | Informative value |
| Cogemica Content | 93-96% | IEC 371-2 |
| Binder Content | 4-7% | IEC 371-2 |
| Flame Resistance | V-0 | UL 94 |
| Oxygen Index | 90 | ASTM-02683 |
Thermal Properties
| Property | Value | Test Method |
| Thermal Conductivity | 0.20 W·K⁻¹·m⁻¹ | Informative value |
| Specific Heat | 0.25 J·g⁻¹·K⁻¹ | Informative value |
| Thermal Expansion Factor | 60 x 10⁻⁶ °C⁻¹ | Perpendicular to layers |
| Thermal Expansion Factor | 10 x 10⁻⁶ °C⁻¹ | Parallel to layers |
| Heat Resistance | 700°C | In continuous service |
| Heat Resistance | 1000°C | In intermittent service |
Electrical Properties
| Property | Value | Test Method |
| Dielectric Strength | >20 KV/mm | IEC 243-1 (23°C) |
| Dielectric Constant | 4.5 | VDE 0303 |
| Tracking Resistance | KA 3c | VDE 0303 |
Compliance
- UL 94 V-0 — Compliant
- IEC 371-3 — Compliant
- VDE 0332 / DIN 40612 — Compliant (FLM 3358)
- UNEL 02412 — Compliant (VMHK)
- NF C 26-120 — Compliant
- Hairdryer and fan-heater space heater insulation
- Circuit breaker insulation components
- Transformer insulation
- Electrical sheathing and covering
- Separator and insulating foil applications utilizing spring power
Common industries: Household appliance manufacturing, electrical switchgear manufacturing, transformer manufacturing, electrical component manufacturing.
Phlogopite Flexible Sheet is built from Phlogopite Cogemica mica paper (grade 132-1P) impregnated with a heat-resistant binder and polymerized by heat treatment. It is entirely free of asbestos and is formable at room temperature, allowing it to be shaped into flexible insulating components without cracking, then cut cleanly by shearing or die-stamping into finished parts.
The material carries a V-0 flame resistance rating with an oxygen index of 90, delivers dielectric strength greater than 20 kV/mm and a dielectric constant of 4.5, and holds a tracking resistance of KA 3c. It has a 6-year storage life at 20°C and is admitted for use in contact with food for human consumption per the CERIA Institute. Compliant with IEC 371-3, VDE 0332 / DIN 40612 – FLM 3358, UNEL 02412 – VMHK, NF C 26 – 120, and UL 94 V-0.
What differentiates Phlogopite Flexible Sheet from the Muscovite grade of the same product family?
Phlogopite Flexible Sheet (grade 132-1P) is rated for continuous service at 700°C and intermittent service to 1000°C — higher than the Muscovite grade (132-2), which is rated to 500°C continuous / 800°C intermittent. Phlogopite Flexible Sheet trades some mechanical strength for this greater heat resistance.
Why does flexibility matter for Phlogopite Flexible Sheet in insulation applications?
Because the material is formable at room temperature and cuts cleanly by shearing or die-stamping, it can be shaped into wraps, sheathing, and separator components for transformers, circuit breakers, and space heaters without cracking — something a rigid mica laminate cannot do.
What is the service temperature range for Phlogopite Flexible Sheet?
The material is rated for 700°C continuous service and 1000°C intermittent service.
Is Phlogopite Flexible Sheet suitable for flame-rated electrical insulation environments?
Yes. It carries a UL 94 V-0 flame resistance rating and is compliant with IEC 371-3, VDE 0332 / DIN 40612 – FLM 3358, UNEL 02412 – VMHK, and NF C 26-120.
How should Phlogopite Flexible Sheet be specified?
Specify grade (132-1P), thickness, compliance requirements, dimensional tolerances, and finished format.
