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About MICA

What is MICA?

Types of MICA

Physical Properties

Chemical Composition

Technical Data Sheets

MICA Comparison Chart

PropertiesUnitsMuscovite Phlogopite
Color Ruby/ Green/ WhiteAmber/ Silver/Green
Densitygm/cm32.6 – 3.22.6 – 3.2
Specific heat 0.210.20
HardnessMoh scale2.8 – 3.22.3 – 3.0
 Shore Test80-10570-100
Breakdown voltageKV/mm120 – 200
Coefficient of expansion per  °C perpendicular to cleavage plane 9 x 10-6 – 36 x 10-630 x 10-6 – 60 x 10-6
Thermal conductivity perpendicular to cleavage planeGm.cal/sec/cm2/°C/cmabout 0.0013about 0.0010
 BTU/hr/ft2/0f/ftabout 0.31about 0.24
Thermal conductivity parallel to cleavage planeGm.cal/sec/cm2/°C/cm about 0.012
 BTU/hr/ft2/0f/ft about 3.0
Water of Constitution % 4.53.0
Moisture Absorption Very lowVery low
Volume Resistivity25°C (77°F) ohm cm40 x 1013 -2 x 10171 x 1012 -1 x 1012
Acid Reaction affected by hydrofluoric acidaffected by sulphuric acid
Insulation resistencex1013ohm/cm4-200000.1 – 10
Calcining temp°C700-800900-1000
Max. operating temp°C500-600800-1000
Optic axial angledegrees55 – 755 -25
Tensile strengthMN/m21751000
Shear strengthMN/m2220 – 2701000-1300
Compression strengthMN/m2190 – 285
Modulus of ElasticityKgfcm2 x 10-3
lbf/in2 x 10-6
1400 – 2100
20 – 30
1400 – 2100
20 – 30
Loss tangentx10-41-410-50
Permittivity at 15°C (60°F) 6 – 75 -6

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