| What's MICA |
The most distinct property of mica is its flat layer split or delaminated
into thin sheets like a flexible film.
Other features include excellent resistance of heat, acid, allkali and
electrical insulation, high dielectric constant,
low thermal expansion coefficient. Its transparency for moscovite.
The following table shows physical properties of Muscovite. |
| Physical property |
Unit |
Value referring to literature etc. |
| True specific gravity |
kg/m3 |
(2.6～3.2)×103 |
| Mohs hardness |
- |
2.0～3.2 |
| Specific heat |
J/kg・K |
860～870 |
Thermal conductivity
(in direction perpendicular to a cleavage surface) |
J/m・s・K |
0.67 |
| Dehydrating temperature of OH in crystal |
℃ |
550 |
| Melting point |
℃ |
1,250 |
| Ignition loss (900℃-3hr) |
wt% |
4～5 |
| Tensile strength |
Pa |
(25～30)×107 |
| Dielectric breakdown voltage |
kV/0.1mm |
18～25 |
| Relative permittivity (50Hz) |
- |
6.5～9 |
| Dielectric loss tangent (50Hz, 25℃) |
% |
0.01～0.02 |
| Volume resistivity |
Ω・m |
1010～1013 |
| Coefficient of liner expansion |
m/m・K |
3.6×10-5 |
| Refractive index |
- |
nα=1.552～1.576
nβ=1.582～1.615
nγ=1.587～1.618 |
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