Physical properties of Muscovite Mica | Properties | Units | | BS 3483 | 100g Mica | | Effect by common acids | Slight | | Hardness (moh's scale) | 2.5 | | Index of refraction | 1.58 | | Softening Point | 2800oF | | Oil absorbtion | 60-90 g/oil | | Specific gravity | 2.82 | | Water soluble | Not more | | BS 1765 | Then 0.5% | | pH value (BS 3483) | 7.7 | | Phericity factor | 0.01 | | pH for distilled water | 5.2 | | Character | White, often sheds tiny flakes | | Lustre | Pearly to vitreous | | Appearance | Transparent to translucent | Technical Properties of Muscovite Mica | Properties | Units | Muscovite | | Thermal conductivity perpendicular to cleavage plane | Gm.cal/sec/cm2/oC/cm BTU.hr/ft2/0f/ft | About 0.0013, About 0.13 | | Thermal conductivity parallel to cleavage plane | Gm.cal/sec/cm2/oC/cm BTU.hr/ft2/0f/ft | --- | | Water of Constitution % | --- | 4.5 | | Moisture Absorption | --- | Very low | | Volume Resistivity | 25o(77oF) ohm cm | 40 x 1013-2 x 1017 | | Acid Reaction | --- | Affected by hydrofluoric acid | | Insulation Resistance | x1013ohm/cm | 4-20000 | | Calcining temp | oC | 700-800 | | Max. operating temp | oC | 500-600 | | Tensile strength | MN/m2 | 175 | | Shear strength | MN/m2 | 175 | | Compression Strength | MN/m2 | 220-270 | | Modulus of Elasticity | Kgfcm2 x 10-3 Ibf/in2 x 10-3 | 1400 - 2100, 20-30 | | Loss tangent | x10-4 | 1-4 | | Permittivity at 15oC(60oF) | --- | 6-7 |
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