KPR - ABOUT MICA

PHYSICAL PROPERTIES OF MICA

Characteristic	Unit	Muscovite	Phlogopite
Colour		Ruby / Green	Amber / Yellow
Density	gm/cm³	2.6 - 3.2	2.6 - 3.2
Density	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
Hardness	Shore Test	80 - 105	70 - 100
Optic Axial Angle		55 - 75	5 - 25
Tensile Strength	kgf/cm²	about 1750	about 1000
Tensile Strength	lbf/in²	about 25000	about 15000
Shear Strength	kgf/cm²	2200 - 2700	1000 - 1300
Shear Strength	lbf/in²	31000 - 38000	14000 - 19000
Compression Strength	kgf/cm²	1900 - 2850	---
Compression Strength	lbf/in²	27000 - 32000	---
Modulus of Elasticity	kgf/cm² x 10^-3	1400 - 2100	1400 - 2100
Modulus of Elasticity	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
Calcining Temperature	F	1290 - 1470	1650 -1830
Maximum operating temperature	C	500 - 600	800 - 900
Maximum operating temperature	F	930 - 1110	1470 -1650
Thermal conductivity
Perpendicular to cleavage planes	Gm.cal/sec/cm²/C/cm	about 0.0013	about 0.0001
Perpendicular to cleavage planes	BTU/hr/ft²/0f/ft	about 0.31	about 0.24
Parallel to cleavage planes	Gm.cal/sec/cm²/C/cm		about 0.012
Parallel to cleavage planes	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	---
Apparent electric strength	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
R.M.S. at 15� C (60�F)	thick Volts per 0.001"	1000 - 2000	750 -1500
Permittivity at 15�C(60^oF)		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 - 1x 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^oC	0.25%
Phosphorus (P)	0.03%
Sulphur (S)	0.01%
Graphite Carbon (C)	0.44%
Loss on Ignition (H₂O)	2.74%

Physical & Chemical Properties

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