Properties of Mica


What is Mica


Types of Mica

Properties of Mica

 

Properties

Units

Muscovite

Phlogopite

Color

 

Ruby/ Green/ White

Amber/ Silver/Green

Density

gm/cm3

2.6 - 3.2

2.6 - 3.2

Specific heat

 

0.21

0.20

Hardness

Moh scale

2.8 - 3.2

2.3 - 3.0

 

Shore Test

80-105

70-100

Breakdown voltage

KV/mm

120 - 200

-

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

Thermal conductivity perpendicular to cleavage plane

Gm.cal/sec/cm2/°C/cm

about 0.0013

about 0.0010

 

BTU/hr/ft2/0f/ft

about 0.31

about 0.24

Thermal conductivity parallel to cleavage plane

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

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

Insulation resistence

x1013ohm/cm

4-20000

0.1 - 10

Calcining temp

°C

700-800

900-1000

Max. operating temp

°C

500-600

800-1000

Optic axial angle

degrees

55 - 75

5 -25

Tensile strength

MN/m2

175

1000

Shear strength

MN/m2

220 - 270

1000-1300

Compression strength

MN/m2

190 - 285

-

Modulus of Elasticity

Kgfcm2 x 10-3

lbf/in2 x 10-6

1400 – 2100

20 - 30

1400 – 2100

20 – 30

Loss tangent

x10-4

1-4

10-50

Permittivity at 15°C (60°F)

 

6 - 7

5 -6

 

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