Potassium Aluminosilicate - Muscovite Mica - Supplier Data by Goodfellow


Mica is a naturally occurring mineral and as such its exact composition varies between grades, as will its properties. Ruby Mica or Pottassium Aluminosilicate is the highest grade of Muscovite Mica. The name comes from the latin ‘micare’, to shine or glitter. It can be split into thin uniform layers, down to 0.05 mm.

The high skill involved in such splitting results in a high cost. Mica is transparent, and resistant to heat, as well as being one of the best electrical insulators known. Potassium Aluminosilicate is resistant to high temperatures and chemically inert to most substances.

Key Properties

The key properties of Potassium Aluminosilicate are tabulated below.

Table 1. Key properties

Chemical Resistance
Acids - concentrated Fair
Acids - dilute Good
Alkalis Good
Electrical Properties
Dielectric constant 6.0-6.6
Dielectric strength ( kV.mm-1 ) 40-200
Volume resistivity ( Ohm.cm ) 1012 @ 25 °C
Mechanical Properties
Compressive strength ( MPa ) 190-280
Hardness - Vickers ( kgf.mm-2 ) 2-3 Mohs
Shear strength ( MPa ) 215-265
Tensile strength ( MPa ) 170-300
Physical Properties
Density ( g.cm-3 ) 2.6-3.2
Refractive index 1.5-1.6
Useful optical transmission range 450-700 nm
Water absorption - saturation ( % ) Very Low
Thermal Properties
Coefficient of thermal expansion ( x10-6 K-1 ) 9-36 @ 20-1000 °C
Specific heat ( J.K-1.kg-1 ) 50 @ 25 °C
Thermal conductivity ( W.m-1.K-1 ) 0.5-7 @ 20 °C
Upper continuous use temperature ( °C ) 500-600

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