Mica sheets are the foundation for manufacturing various mica parts used in thermal, electrical, and mechanical insulation applications. The appropriate material of the mica sheet, either Muscovite or Phlogopite, depends on the specific requirements of your application. Muscovite mica offers excellent dielectric strength and is ideal for lower-temperature applications, while Phlogopite provides superior thermal resistance, making it suitable for high temperature environments up to 1000°C.
The level of heat resistance needed will also determine the thickness of mica sheet. Thicker mica sheets will provide better thermal insulation and structural integrity. Mica sheets are not uniform; they can be ordered in various sizes, thicknesses, and different degrees of smoothness to meet your specific needs. In addition to excellent thermal and electrical insulation properties, mica sheets are flame-resistant, chemically stable, and non-toxic, making them ideal for industries such as electronics, automotive, aerospace, and household appliances. At USAMica, we customize our sheets to meet your exact performance needs.
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Properties
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.
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| 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: | In Continuous Service: 500 °C In Intermittent Service: 800 °C |
In Continuous Service: 700 °C In Intermittent Service: 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) | at 20°C: 25 KV/mm at 400°C: 13 KV/mm at 600°C: 10 KV/mm |
at 20°C: 25 KV/mm at 400°C: 13 KV/mm at 600°C: 10 KV/mm |
| Volume Resistivity: (IEC 60093) | at 20°C: >1016 Ω/cm >1016 Ω/cm at 400°C: >1012 Ω/cm >1012 Ω/cm at 500°C: >109 Ω/cm >109 Ω/cm |
at 20°C: >1016 Ω/cm at 400°C: >1012 Ω/cm at 500°C: >109 Ω/cm |
| Weight Loss Continuous: (IEC 60371-2) | at 500°C: <1 % | at 500°C: <1 % at 700°C: <2 % |
| Thermal Conductivity: | Perpendicular to Plane of the Plate: 0,3 W/mK 0,3 W/mK Along the Plane of the Plate: 3,0 W/mK 3,0 W/mK |
Perpendicular to Plane of the Plate: 0,3 W/mK Along the Plane of the Plate: 3,0 W/mK |
| Thermal Expansion: | Perpendicular: 100 x 10-6 /°K Parallel: 10 x 10-6 /°K |
Perpendicular: 100 x 10-6 /°K Parallel: 10 x 10-6 /°K |
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