PHYSICAL PROPERTIES OF MICA

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/ft2/0f/ft
about 0.31
about 0.24
Parallel to cleavage planes
Gm.cal/sec/cm2/C/cm
 
about 0.012
BTU/hr/ft2/0f/ft
 
about 3.0
Water of 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 (60F)
0.01" to 0.05" KV/mm
40 - 80
30 -60
thick Volts per 0.001"
1000 - 2000
750 -1500
Permittivity at 15C(60oF)
 
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
     
           
           

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