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MICA

MICA

Mica is a group of a complex aluminosilicate minerals having a sheet or plate like structure with different chemcial compositions and physical properties. It is mined in the form of "blocks" or rocks, which are then rifted to arrive at thin flexible natural mica splittings. Mica is a complex hydrous silicate of aluminium, containing potassium, magnesium, iron, sodium fluorine and/or lithium and also traces of several other elements. It is stable and completely inert to the action of water, acids (except hydro-fluoric and concentrated sulphuric) alkalies, conventional solvents, oils and is virtually unaffected by atmospheric action. It is transparent, optically flat, easily splittable into thin films along its cleavage, colourless in thin sheets, resilient and incompressible.Mica has a high dielectric strength to prevent current from flowing across it at moderate voltages.

Properties

Mica has the unique combination of great dielectric strength, uniform dielectric constant and capacitance stability, low power loss (high Q factor), high electrical resistivity and low temperature coefficient and capacitance. It is fire proof, infusable, incombustible and non-flammable and can resist temperatures of 600oC to 900oC (1112oF to 1652oF) depending on the type of mica. It has low heat conductivity, excellent thermal stability and may be exposed to high temperatures without noticeable effect. Mica is relatively soft and can be hand cut, machined or die-punched. It is flexible, elastic and tough, having high tensile strength.

Uses

Mica is invaluable in the electrical industry because of its unique combination of physical, chemical and thermal properties.
Cut Mica Plates for Mica Capacitors
Radiation Insulation
Transistor and Semi-Conductors
Silvered Mica Plates
Radiation Pyrometers and Thermal Regulators
Communication Devices
Mica Capacitors
Resistance and Potentiometers Cards
Accoustics Aparatus, Detonators, Radiophone, Gramophone, Sound Boxes, Head Phones, LoudSpeakers
Radio & Television Tubes
Primary and Secondary Insulation
Steam Boilers
Guided Missiles
Bushing and Tubes
Quarter Wave Plates for Optical Instruments
Microwave Tube Windows
Televisions
Marker Dials for Navigation compasses
Target and Mosaic Mica for Telecasting Industry
Geiger Counter for Radio
Goggles
Missiles and High Speed Aircraft Randoms and Canopies
High Tension Coil of Radars
Diaphragms for Oxygen Breathing Equipment
Jet Engines
Telephone
Windows for Anthracite Gas or Petromax Lamps and Kerosene Stoves, Isinglass, Furnace, Peepholes, Heat Screens, Metalurgical Furnaces and Kilns, Canopies, Shields, smoke Helmets, Diver Helmets, Gas Masks, etc.
Interlayer Insulation for Transformer Coils
High Voltage Lamps

Pressed mica sheets are often used in place of glass in greenhouses. Mica is often found in mineral cosmetics.

Some brands of toothpaste include powdered white mica. This acts as a mild abrasive to aid polishing of the tooth surface, and also adds a cosmetically-pleasing glittery shimmer to the paste. The shimmer from mica is also used in makeup, as it gives a translucent "glow" to the skin or helps to mask imperfections. Mica is used in the production of pearlescent pigments. Many metallic looking pigments are composed of a substrate of mica coated with another mineral, usually TiO2. The resultant pigment produces a reflective color depending on the thickness of the coating. These products are used to produce automobile paint, shimmery plastic containers, high quality inks used in advertising and security applications. Another use of mica is in the production of ultraflat thin film surfaces (e.g. gold surfaces) using mica as substrate. Muscovite mica is the most common substrate for sample preparation for the atomic force microscope.

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