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A mica sheet is a flat insulation material made from mica and used where electrical and thermal performance are required. Manufacturers use mica sheets to produce precision insulation components for electronics, automotive, aerospace, and industrial equipment.
Selecting the correct mica sheet depends on performance requirements. Muscovite mica sheets provide high dielectric strength and stable electrical insulation for low- to medium-temperature applications, while Phlogopite mica sheets are used for higher-temperature insulation, providing continuous service at 700°C and intermittent service up to 1000°C.
Axim Mica manufactures AX-THERM mica sheets to application-specific requirements, with custom cutting and sizing available to match your application. Contact our engineering team to discuss your mica sheet requirements.
With over 20 years of experience in mica manufacturing, Axim Mica supplies AX-THERM mica sheets for industrial, automotive, aerospace, EV, and electrical insulation applications.
Axim Mica is ISO 9001:2015-certified, with quality controls that support consistent manufacturing and product specifications.
Axim Mica offers custom cutting and sizing to match application requirements, from full sheets to precision-fabricated components.
Axim Mica provides technical support to help customers evaluate muscovite or phlogopite based on temperature, dielectric, and dimensional requirements.
Mica's combination of thermal resistance, dielectric performance, mechanical strength, and dimensional stability supports use across many industries.
Muscovite mica sheets provide high dielectric strength and are commonly specified for electrical insulation in low- to medium-temperature applications. AX-THERM Muscovite has a tensile strength of 150 N/mm² and bending strength of 230 N/mm², with continuous service at 500°C and intermittent service up to 800°C.
Phlogopite mica sheets are typically specified for higher-temperature insulation, with AX-THERM Phlogopite providing continuous service at 700°C and intermittent service up to 1000°C.
“As a long-time customer of Axim Mica they consistently deliver on what matters most: reliable lead times and favorable pricing. Over the years, they’ve proven to be a stable and trustworthy supplier, even when market conditions fluctuate.”
AX-THERM M & P mica sheets are also the ideal alternative for asbestos insulation due to:
Mica sheets can be used as an asbestos replacement in high-temperature and electrical insulation applications where thermal resistance, dielectric performance, and fire resistance are required. AX-THERM Muscovite and Phlogopite mica sheets combine high-temperature capability with electrical insulation and chemical resistance, supporting use in industrial, electrical, and automotive applications where asbestos-based insulation materials may need to be replaced.
AX-THERM M & P mica sheets are also an alternative for asbestos insulation due to:
| PROPERTY | MUSCOVITE MICA | PHLOGOPITE MICA |
|---|---|---|
| Material Type | Potassium aluminum silicate | Potassium magnesium aluminum silicate |
| Max Continuous Temp | ~500–600 °C | ~800–1000 °C |
| Max Peak Temp | ~700 °C | ~1000 °C |
| Dielectric Strength | Higher relative | Very good |
| Primary Advantage | Electrical insulation performance | Thermal resistance at elevated temperatures |
| Best-Fit Uses | Electrical components & moderate heat insulation | Extreme heat insulation & thermal barriers |
Mica sheets are composed primarily of the mineral mica, which consists of aluminum silicate along with other elements such as potassium, iron, magnesium, and water.
Our AX-THERM Muscovite & Phlogopite mica sheets consist of 85-90% high-grade Muscovite or Phlogopite that is impregnated with a high temperature resistant silicone resin.
| TECHNICAL DATA | MUSCOVITE | PHLOGOPITE |
|---|---|---|
| Mica Content (IEC 60371-2) | 85–90% | 85–90% |
| Silicone Binder Content (IEC 60371-2) | 10–15% | 10–15% |
| Density (IEC 60371-2) | 2.2–2.3 g/cm³ | 2.2–2.3 g/cm³ |
| Heat Resistance | Continuous: 500°C / Intermittent: 800°C | Continuous: 700°C / Intermittent: 1,000°C |
| Tensile Strength (ISO 527) | 150 N/mm² | 110 N/mm² |
| Bending Strength (ISO 178) | 230 N/mm² | 170 N/mm² |
| Water Absorption | <1% (24h/23°C) | <1% (24h/23°C) |
| Dielectric Strength (IEC 60243) | 20°C: 25 KV/mm / 400°C: 13 KV/mm / 600°C: 10 KV/mm | 20°C: 25 KV/mm / 400°C: 13 KV/mm / 600°C: 10 KV/mm |
| Volume Resistivity (IEC 60093) | 20°C: >10¹&sup6; Ω/cm | 20°C: >10¹&sup6; Ω/cm |
| Weight Loss Continuous (IEC 60371-2) | 500°C: <1% | 500°C: <1% / 700°C: <2% |
| Thermal Conductivity | Perpendicular: 0.3 W/mK / Along plane: 3.0 W/mK | Perpendicular: 0.3 W/mK / Along plane: 3.0 W/mK |
| Thermal Expansion | Perpendicular: 100 × 10⁻⁶/°K | Perpendicular: 100 × 10⁻⁶/°K |
Our AX-THERM Muscovite & Phlogopite mica sheets consist of 85-90% high-grade Muscovite or Phlogopite that is impregnated with a high temperature resistant silicone resin.
Mica sheets are flat insulation materials made from mica and used for their thermal and electrical insulation properties. AX-THERM mica sheets consist of 85–90% high-grade Muscovite or Phlogopite mica impregnated with 10–15% high-temperature-resistant silicone binder.
AX-THERM mica sheets are manufactured from 85–90% high-grade Muscovite or Phlogopite mica impregnated with 10–15% high-temperature-resistant silicone binder. The resulting material is formed into sheets that can be cut, shaped, or fabricated into application-specific insulation components.
Mica is a good insulator because it combines strong dielectric performance with thermal resistance and dimensional stability. AX-THERM mica sheets provide dielectric strength of 25 kV/mm at 20°C and through-thickness thermal conductivity of 0.3 W/m·K, helping electrically isolate components while limiting heat transfer in demanding applications.
Finished mica sheets are generally stable during normal handling and use. The primary health concern arises when cutting, sanding, or machining mica creates fine airborne dust that can be inhaled. Appropriate dust control, ventilation, and personal protective equipment should be used during fabrication and machining in accordance with applicable workplace procedures.
The main difference between muscovite and phlogopite mica is their temperature performance and typical application. AX-THERM Muscovite is commonly specified where strong dielectric performance is required, with continuous service at 500°C and intermittent service up to 800°C. AX-THERM Phlogopite is typically selected for higher-temperature applications, with continuous service at 700°C and intermittent service up to 1000°C. Both have the same specified dielectric strength: 25 kV/mm at 20°C, 13 kV/mm at 400°C, and 10 kV/mm at 600°C.
Phlogopite mica is better suited for higher-temperature applications. AX-THERM Phlogopite provides continuous service at 700°C and intermittent service up to 1000°C, compared with AX-THERM Muscovite at 500°C continuous service and up to 800°C intermittent service. This makes phlogopite the preferred option when higher temperature capability is the primary material requirement.
Dielectric strength measures how much electrical voltage an insulating material can withstand before electrical breakdown occurs. For AX-THERM mica sheets, dielectric strength is specified in kV/mm: 25 kV/mm at 20°C, 13 kV/mm at 400°C, and 10 kV/mm at 600°C. Higher dielectric strength supports electrical insulation in applications where components must remain electrically isolated under high voltage.
Flexibility depends on the sheet thickness and construction. Thinner mica sheets can provide some flexibility for curved or non-uniform assemblies, while thicker sheets become more rigid and dimensionally stable. AX-THERM mica sheets are available in different thicknesses, so the appropriate format should be selected based on the application’s insulation, dimensional, and installation requirements.
AX-THERM mica sheets are available in thicknesses from 0.1mm to 101.6mm. The appropriate thickness depends on the application’s thermal, electrical, mechanical, and dimensional requirements, with custom fabrication available for application-specific components.
Choose the right mica sheet based on your application’s temperature, dielectric, mechanical, and dimensional requirements. AX-THERM Phlogopite is typically selected for higher-temperature applications, with continuous service at 700°C and intermittent service up to 1000°C. AX-THERM Muscovite provides continuous service at 500°C and intermittent service up to 800°C. Both have the same specified dielectric strength, so material selection should also consider the required thickness, mechanical properties, dimensions, and fabrication needs.
The best way to cut mica sheets depends on the material thickness, part geometry, and fabrication requirements. AX-THERM mica sheets can be custom-fabricated into strips or parts according to customer drawings and specifications. When cutting, sanding, or machining mica, use appropriate dust control, ventilation, and personal protective equipment to reduce exposure to fine airborne dust.
Store unused mica sheets in a clean, dry area where they are protected from moisture, contamination, and physical damage. Keep the sheets supported and protected from chipping, cracking, or other damage before fabrication or installation.
Yes, mica sheets can be bonded, but the adhesive or bonding system should be selected based on the operating temperature, substrate materials, and application requirements. Surface preparation and bonding procedures should follow the adhesive manufacturer’s specifications to support proper adhesion and performance.
Signs of a failing mica insulator can include visible cracking, chipping, surface damage, or evidence of electrical breakdown. These conditions may indicate that the material’s insulating or mechanical performance has been compromised. Damaged mica insulation should be inspected against the application’s performance requirements and replaced when it no longer meets those requirements.
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