Potassium Aluminosilicate (Muscovite Mica)



Mica has an estimable electrical, physical, mechanical and thermal pertinacity properties. It has high transparency, optical clarity, flatness, non-breakability and heat resistance. As such, it is suitably used as windows in Kerosene stove, Wood stoves, Furnace peep-holes and microwave ovens.

Mica eliminates risk of cracks, breakage, jerks and can easily withstand shocks, strains and vibration during operations at higher temperatures and prevent grassing. Mica also provide complete safety, versatility, durability and reliability and retain its basic strength.

Mica sheet can be expose to high temperature up to ~ 540 °C (~1000F)



Density ρ

2.6 - 3.2 g/cm³ at 20 °C


Hardness, Mohs HM

2 - 3.2 [-] at 20 °C

Tensile strength Rm

255 - 296 MPa at 20 °C


Coefficient of thermal expansion α

8E-6 - 9E-6 1/K at 200 °C

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Coefficient of thermal expansion, transverse αtrans

1.5E-5 - 2.5E-5 1/K at 100 °C

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Max service temperature Tmax

400 - 500 °C

no decomposition

Specific heat capacity cp

0.21 J/(kg·K) at 25 °C

Thermal conductivity λ

8 W/(m·K) at 20 °C


Dielectric constant εr

6.5 - 9 [-] at 20 °C

Electrical resistivity ρel

1.00E+1 - 1.00E+13 Ω·m at 20 °C

Power factor PF

0.08 - 0.09 [-] at 25 °C

60 cycles


Optical axial angle α

38 - 47 °

Optical plane orientation

Perpendicular to plane of symmetry

Refractive index, α nd,α

1.55 - 1.57 [-]

Refractive index, β nd,β

1.58 - 1.61 [-]

Refractive index, γ nd,γ

1.59 - 1.61 [-]

Technological properties

Application areas

Rigid or flexible mica sheets can be used for electrical insulating, high temperature mica washers, mica gaskets, heaters manufacturing and many other applications

This material data has been provided by Goodfellow.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.