Mica

Mica a type of phyllosilicate is the name given to a group of rock-forming minerals characterised by highly perfect basal cleavage. This means that Mica has a tendency to split along planes determined by crystal structure, yeilding a great number of thin, tough, plastic laminae. Among the principal rock-forming minerals, micas are common in all three major rock varieties--igneous, sedimentary, and metamorphic.

Mica has an extremely high dielectric strength, low electric loss, high surface and volume resistivities, excellent thermal stability and high shear and tensile strengths. It is completely inert to the action of water, acids, alkalies, oils and solvents. It is fireproof and noninflammable, unaffected by temperatures up to 1200 to 1600 degrees F., and is resistant to the oxidizing action of electrical discharges.

Micas are used in the production of a wide range of products including; stove windows, boiler gauge packings, as fillers, as lubricant, absorbant materials, dusting powder, packing material, wallpaper, roofing paper, paints, in the analysis of polarised light and are an important source of lithium and rubidum salts.

Mica's excellent electrical, thermal and mechanical stability leads to its most common use in thermal and electrical applications. These products are often combined with a range of backing materials or composites to improve the mechanical strength or to produce a form that is more easily handled.

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