PHYSICAL PROPERTIES
CHEMICAL PROPERTIES

Physical Properties:


Characteristic

Unit

Muscovite

Phlogopite

Colour   Ruby / Green Amber / Yellow
Density gm/cm3 2.6 - 3.2 2.6 - 3.2
lb/ln3 0.095-0.116 0.095-0.116
Specific Heat   0.21 0.21
Hardness Moh Scale 2.8 - 3.2 2.3 - 3.0
Shore Test 80 - 105 70 - 100
Optic Axial Angle   55 - 75 5 - 25
Tensile Strength kgf/cm2 about 1750 about 1000
lbf/in2 about 25000 about 15000
Shear Strength kgf/cm2 2200 - 2700 1000 - 1300
lbf/in2 31000 - 38000 14000 - 19000
Compression Strength kgf/cm2 1900 - 2850 ---
lbf/in2 27000 - 32000 ---
Modulus of Elasticity kgf/cm2 x 10-3 1400 - 2100 1400 - 2100
lbf/in2 X 10-6 20 - 30 20 -30
Coefficient of expansion per °C perpendicular to cleavage plane 9 X 10-6 - 36 X 10-6 30 X 10-6 - 60 X 10-6
Calcining Temperature ° C 700 - 800 900 - 1000
° F 1290 - 1470 1650 -1830
Maximum operating temperature ° C 500 - 600 800 - 900
° F 930 - 1110 1470 -1650

Thermal conductivity

     
Perpendicular to cleavage planes Gm.cal/sec/cm2/ °C/cm about 0.0013 about 0.0001
BTU/hr/ft2/°F/ft about 0.31 about 0.24
Parallel to cleavage planes Gm.cal/sec/cm2/ °C/cm   about 0.012
BTU/hr/ft2/°F/ft   about 3.0
Percentage of water constitution   4.5 3.0
Moisture absorption   Very low Very low
Apparent electric strength 0.001" to 0.003" KV/mm 120 - 200 ---
Thick Volts per 0.001" 3000 - 5000 ---
R.M.S. at 15° C (60° F) 0.01" to 0.05" KV/mm 40 - 80 30 -60
thick Volts per 0.001" 1000 - 2000 750 -1500
Permittivity at 15 °C (60 °F)   6-7 5-6
Power Factor (loss tangent) @ 15 °C (60 °F) 0.0001 - 0.0004 0.001 - 0.005
Volume Resistivity 25 °C (77 °F) ohm cm 40 x 1013 - 2 x 1017 1 x 1012 - 1 x 1012
Acid reaction   Affected by Hydrofluoric Acid Affected by Sulphuric Acid

Chemical Properties:


Silica (SiO2) 45.57%
Alumina (Al2O3) 33.10%
Potassium Oxide (K2O) 9.87%
Ferric Oxide (Fe2O3) 2.48%
Sodium Oxide (Na2O) 0.62%
Titanium Oxide (TiO2) Traces
Calcium Oxide (CaO) 0.21%
Magnesia (MgO) 0.38%
Moisture at 100°C 0.25%
Phosphorus (P) 0.03%
Sulphur (S) 0.01%
Graphite Carbon (C) 0.44%
Loss on Ignition (H2O) 2.74%
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