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APPLICATIONS
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About Mica Natural mica Natural mica has exceptional physical characteristics. It can be found throughout the world, most notably in the presence of Paleozoic rocks. Accessible deposits are located primarily in India, on the American continent, in southern Africa and in Russia. As a mineral, mica has a special characteristic - it can be cleft to obtain very thin flakes of constant thickness. Mica's chemical composition places this mineral in the aluminum silicate group. Two types are extracted - Muscovite, in which there is a predominance of potassium and Phlogopite, in which the presence of magnesium can be detected. Muscovite K Al2 (Al Si3 O10) (OH)2 This is the most widespread mineral, and the name comes from the city of Moscow - in the Middle Ages, large deposits were used nearby to make windows. It contains potassium and is light in appearance. The mechanical properties are better than those of Phlogopite. Phlogopite K Mg3 (Al Si3 O10) (OH)2 Phlogopite contains magnesium and is dark in appearance. It can withstand higher temperatures than Muscovite. PROPERTIES OF MICA Thermal Mica can withstand temperature in excess of 1000°C / 1830°F (Phlogopite), it is flame-retardant, non-flammable, does not give off fumes, and conducts very little heat, especially perpendicular to its strata. Electrical Natural mica has a dielectric strength greater than 25 kV/mm (625 V/mil), has good resistance to arcing and electrical erosion, and is permeable to microwaves. Chemical Mica is tolerant of water and most chemical agents, such as solvents, acids, bases and mineral oils. Mechanical Mica has good compressive strength. It behaves well in the presence of tensile and bending stresses. It has a high modulus of elasticity. Commercial Mica and Occurrence Mica is widely distributed and occurs in igneous, metamorphic and sedimentary regimes. Large crystals of mica used for various applications are typically mined from granitic pegmatites ... 
Usage It is mainly used in electro-thermal insulation. Mica has a high dielectric strength and excellent chemical stability, making it a favoured material for manufacturing capacitors for radio frequency applications. It has also been used as an insulator in high voltage electrical equipment, and between the bars of commutators in Direct Current motors and generators. |
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