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Potassium Aluminosilicate ( Muscovite Mica )

Material Information

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General Description:  

Mica is a naturally occurring mineral and as such its exact composition varies between grades, as will its properties. Ruby Mica 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 0.05mm. 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. It is resistant to high temperatures and chemically inert to most substances.
   

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 @25C ( Ohmcm ) 1012

Mechanical Properties

Compressive strength ( MPa ) 190-280
Hardness - Vickers ( kgf mm-2 ) 2-3 Mohs
Shear strength ( MPa ) 215-265

Physical Properties

Density ( g cm-3 ) 2.6-3.2
Refractive index 1.5-1.6
Useful optical transmission range 450-700nm
Water absorption - saturation ( % ) Very Low

Thermal Properties

Coefficient of thermal expansion @20-1000C ( x10-6 K-1 ) 9-36
Specific heat @25C ( J K-1 kg-1 ) 50
Thermal conductivity @20C ( W m-1 K-1 ) 0.5-7
Upper continuous use temperature ( C ) 500-600

Buy Potassium Aluminosilicate on-line

Standard products are available in these forms
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Sheet

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