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Mica Sheets

Rigid Mica Sheets: Thermal & Electrical Insulation

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 Axim Mica, we customize our sheets to meet your exact performance needs.

Mica sheets are the foundation from which mica parts are made.
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.
Mica sheets are used for high-performance thermal and electrical insulation.

Application

Axim’s mica sheets are renowned for their versatility and durability in applications that require electrical and thermal insulation. It offers exceptional electrical properties, high heat resistance, and notable chemical stability that makes it an indispensable material.

AX-THERM Muscovite & Phlogopite mica sheets are used in a broad range of industries such as:

  • Heating elements for electrical and thermos-mechanical equipment
  • Construction of induction, arc, or high frequency furnaces
  • High voltage applications
  • High thermal applications
  • Industrial sealing and gasket industries (e.g. oil and gas distribution)

 

AX-THERM M & P mica sheets are also the ideal alternative for asbestos insulation due to:

  • Good resistance to high temperature and chemicals
  • Low heat conductivity
  • High dielectric strength
  • High-voltage performance
  • Fire resistance classification: UL94 (94 V-0), BS 479 (CLASS 1), NBN 21-203 (A1)

Composition

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.

Supply Form

At Axim Mica, we offer a broad range of size and thickness to fit any application.

Thickness: 0.1mm – 101.6mm (tolerances: 2-5mm +/- 7% | 5-30mm +/- 5% | 30-80mm +/- 3%)

Sizes: 1000mm widths, max. 2400mm lengths

New Option: Ultra Smooth Surface or De-Smoked Mica Sheets

Customized strips or parts according to customers’ drawings and/or requirements

Comparing AX-THERM Muscovite & Phlogopite

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

Frequently Asked Questions

Mica is a mineral that belongs to a group of silicate minerals known as phyllosilicates. It is characterized by its highly perfect basal cleavage, which allows it to be split into thin sheets that are flexible, elastic, and transparent. Mica is valued for its resistance to heat, electricity, and acids.

Mica is best for applications requiring thermal insulation, electrical insulation, and resistance to chemical corrosion. It is extensively used in the electronics industry for components like capacitors and insulators, and in industries requiring high-temperature insulation materials, such as furnaces and microwave ovens.

In a microwave, a mica sheet is used as a waveguide cover. It covers the aperture through which microwaves are admitted into the main cavity of the oven. The mica sheet helps prevent food particles and moisture from entering the waveguide, which can cause damage and efficiency loss.

Mica sheets are valued for their clear visibility and effective protection from outdoor conditions, effectively blocking dust, dirt, and harsh weather. Their durability against scratches ensures they maintain quality over time, making them a reliable choice for see-through enclosures.

View our Mica Products

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Choose Axim Mica for top-quality regular mica sheets, delivering superior thermal resistance and electrical insulation.

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