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Properties and chemical composition of Mica Grade V1
Grade Classification of Muscovite Mica

PHYSICAL PROPERTIES OF MICA GRADE V1

Characteristic Unit Muscovite
Colour   Ruby / Green
Density gm/cm3 2.6 - 3.2
lb/ln3 0.095-0.116
Specific Heat   0.21
Hardness Moh Scale 2.8 - 3.2
Shore Test 80 - 105
Optic Axial Angle   55 - 75
Tensile Strength kgf/cm2 about 1750
lbf/in2 about 25000
Shear Strength kgf/cm2 2200 - 2700
lbf/in2 31000 - 38000
Compression Strength kgf/cm2 1900 - 2850
lbf/in2 27000 - 32000
Modulus of Elasticity kgf/cm2 x 10-3 1400 - 2100
lbf/in2 X 10-6 20 - 30
Coefficient of expansion per °C perpendicular to cleavage plane   9 X 10-6 - 36 X 10-6
Calcining Temperature C 700 - 800
F 1290 - 1470
Maximum operating temperature C 500 - 600
F 930 - 1110
Thermal conductivity    
Perpendicular to cleavage planes Gm.cal/sec/cm2/C/cm about 0.0013
BTU/hr/ft2/0f/ft about 0.31
Parallel to cleavage planes Gm.cal/sec/cm2/C/cm  
BTU/hr/ft2/0f/ft  
Water of constitution %   4.5
Moisture absorption   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
thick Volts per 0.001" 1000 - 2000
Permittivity at 15°C(60oF)   7-Jun
Power Factor (loss tangent) @ 15° C (60° F) 0.0001 - 0.0004
Volume Resistivity 25° C (77° F) ohm cm 40 x 1013-2 x 1017
Acid reaction   Affected by Hydrofluoric Acid



CHEMICAL COMPOSITION OF MICA V1

 
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 100oC 0.25%
Phosphorus (P) 0.03%
Sulphur (S) 0.01%
Graphite Carbon (C) 0.44%
Loss on Ignition (H2O) 2.74%

 

QUALITY CLASSIFICATION OF MUSCOVITE MICA BASED ON VISUAL PROPERTIES

  V-1
Clear
Highest Quality
V-2
Clear and
Slightly Stained
V-3
Fair Stained
V-4
Good Stained
V-5
Stained A Quality
V-6
Stained B Quality
V-7
Heavy Stained
V-7A
Densely Stained
V-8
Black Dotted
V-9
Black spotted
V-10
Black Stained
V-10A
Densely Black
& Red Stained
Crystallographic Discoloration X *d *d *d * * * * * * * *
Very Slight X * * * * * * * * * * *
Slight X X * * * * * * * * * *
Medium X X X *e *f * * * * * * *
Heavy X X X X X * * * * * * *
Cloudy Stains X X X X X X *g *h * * * *
Light Black and
Red Dots (Mineral)
X X X X X *d *d *h * * * *
Black Stains
(Mineral)
X X X X X X X *g X *d *g *h
Red Stains
(Mineral)
X X X X X X X *g X X *d *
Black and Red
Stains (Mineral)
X X X X X X X X X X X *
Green Stains
(Vegetable Type)
X X X X *d *g *g * * * * *
Clay Stains X X X X X *d *g * X X *d *d
Nearly Flat * * * * * * * * * * * *
Slight X X * * * * * * * * * *
Medium X X X * * * * * * * * *
Heavy X X X X X * * * X X X *
Hard * * * * * * * * * * * *
Soft X X X X X X S * X X X S
Stones and Holes X X X X X X X X X X X X
Buckles X X X X X X S *g X X X X
Reeves X X X X X X X X X X X X
Ridges X X X X X X S *g X X X X
Tears X X X X X X X X X X X X
Cracks X X X X X X X X X X X X
Hairline Cracks X X X X X X X X X X X X
Wedge X X X X X X X X X X X X
Tangle Sheet X X X X X X X X X X X X
Herringbones X X X X X X X * X X X X
Sand Blast X X X X X X S * X * * *

Symbols

Permissable *
Not Permissable X
Permissable Only If Specified S
Few And Tiny In 1/4 Of Usable Area a
In 1/2 Of Usable Area b
Very Dense c
Slight d
In 2/3 Of Usable Area e
Uniformly Distributed f
Medium g
Heavy h