Mica Sheets

Mica Sheets are the foundation from which mica parts are made. Depending on your application, the correct mica sheet for an application depends on the material: Muscovite, or Phlogopite. Depending on the level of heat resistance needed, the thickness of mica sheet will also vary. Mica sheets are not uniform, and they can be ordered in various sizes and different degrees of smoothness based on the needs of the customer.


Ax-THERM M & P mica sheets are used for high-performance thermal and electrical insulation in a broad range of industries such as

  • heating elements for electrical & thermo mechanical equipment
  • construction of induction, arc or high frequency furnaces
  • high voltage applications
  • high thermal applications
  • industrial sealing & gasket industries (e.g. oil & gas distribution)

Ax-THERM M & P mica sheets are the ideal alternative for asbestos insulations.

Good resistance to high temperatures & chemicals, low heat conductivity, high dielectric strength, good high-voltage proof performance. Fire resistance classification UL94 (94 V-0), BS 479 (class 1), NBN 21-203 (A1).


Ax-THERM M & P mica sheets consist of 85 – 90% high-grade Muscovite alternatively Phlogopite mica paper impregnated with an outstanding high temperature resistant silicone resin.

Supply Form

Thickness: 0.1mm – 101.6 mm
(tolerances 2-5mm +/- 7%, 5-30mm +/- 5%, 30-80mm +/- 3%)
Sizes: 1000 mm widths, max. 2400 mm lengths

New Option: Ultra Smooth Surface and or De-smoked Mica sheets
Customized strips or parts according to customers’ drawings and/or requirements.


AX-THERM M & P mica sheets are very suitable for precise/ accurate sawing, drilling & grinding with high-performance tools.

AX-THERM M & P (Rigid Mica Sheets)

Technical DataMuscovitePhlogopite
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/cm³2,2 – 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/mm²110 N/mm²
Bending Strength: (ISO 178)230 N/mm²170 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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