Properties of Mica
Mechanical |
|
| Density: | Gr./Cu. Cm. · 2.6-3.2 Lb./Cu. Ft. · 160-200 |
| Hardness, Mohs | 2.0-3.2 |
| Cleavage | Basal, Eminent |
| Crystal Structure | Monoclinic |
| Max. Temperature with no decomposition | 400-500°C |
| Specific heat (25°C) | .206-.209 |
| Thermal Conductivity perpendicular to cleavage: | Cal./Sq. Cm./Sec./Cm./°C · 16x10-4 B.T.U./Sq. Ft./Hr./I.°F · 4.6 |
| Coefficient of expansion per °C perpendicular to cleavage: | 20° - 100° C · 15x10-6 - 25x10-6 100° - 300° C · 15x10-6 - 25x10-6 300° - 600° C · 16x10-6 - 36x10-6 |
| Coefficient of expansion per °C parallel to cleavage: | 0° - 200° C · 8x10-6 - 9x10-6 200° - 500° C · 10x10-6 - 12x10-6 |
| Tensile strength, P.S.I. | 37,000 - 43,000 |
| Modulus of elasticity | 25x106 |
Electrical |
|
| Dielectric Constant | 6.5 - 9 |
| Dielectric Strength (highest qualities 1-3 mils thick), olts/Mil. | 6,000 - 3,000 |
| Power Factor at 25°C (77°F) (highest qualities), percent: | 60 cycles · 0.08 - 0.09 1 megacycle · 0.01 - 0.02 |
| Resistivity, Ohm-Cm. | 1012 - 1015 |
Optical |
|
| Optic axial angle (2V) degrees | 38 - 47 |
| Orientation of optic plane to plane of symmetry | Perpendicular |
| Indexes of refraction | Alfa · 1.552 - 1.570 ß · 1.582 - 1.607 Char · 1.588 - 1.611 |