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Element Formula Percentage (Approx.)
Silica SiO2 47-50%
Alumina Al2O3 29-33%
Oxide of Iron Fe2O3 2.5-4.5%
Titanium Oxide TiO2 0.10-0.20%
Lime CaO 0.08-2.0%
Magnesia MgO 0.3-0.4%
Potash K2O 9.0-12.0%
Soda Na2O 1.0-2.5%
Phosphorous P2O5 Negligible
Sulfur S Negligible
Loss on ignition   3.5%
Property Approximate
Color Transparent, white, ruby
Shape Thin flakes
Particle size 10-5000 microns depending on grade
Aspect ratio 20-70
Bulk Density 0.17-0.29 gms/cc
Apparent Density 10-14 lbs/ft3
Specific Gravity 2.8-3.0
Hardness (Moh's Scale) 2.5-3.0
pH (BS 3483) 7.5-9.5
Water Solubility Virtually insoluble
Oil Absorption (BS 3483) 60-75 gms oil/100 gms mica
Whiteness (MgO) 80-88%
Phericity Factor 0.01
Tensile Strength        :           125X103 psi
Modulus of Elasticity :           25 X 106 psi


Dielectric constant (100 Hz):           6-6.7
Dissipation Factor (100 Hz):           4.5-8.2 x 102
Volume resistivity (Ohm-cm:            7.5-8.8 x 1010

Refractive Index                :           1.58
UV Visible absorption         :           Very strong
IR absorption                      :              Very strong

Coefficient of thermal expansion:
            - Normal to cleavage            : 9 x 106K1

            - Parrel to cleavage              : 4 x 106K1

            - Maximum temperature       : 8000C



  1. Vacuum Tubes
  2. Capacitors
  3. Gauge Glass/Liquid Indicators for high pressure steam boilers
  4. Diaphragm in oxygen breathing apparatus
  5. Head phone & loud speakers
  6. Window cover for microwaves and stoves
  7. Radiation Pyrometers
  8. Geiger counters
  9. Insulation in DC Motors and Generators
  10. Electrical Heating appliances
  11. Lamps and Transformer Coils
  12. Retardation Plates in Helium-Neon Lasers
  13. Thermal Regulators etc.
Built Up Mica/Micanite - For use in segment plate, molding plate, flexible plate, heater plate and tape etc.


Ground mica is used as a filler and extender in gypsum wallboard joint compounds to fill the joints between panels of wallboards, as well as in the finished coating of ceilings. In this particular application, mica contributes to make a non-absorbing smooth surface that reduces shrinkage and eliminates cracks. Mica further provides a pervasive reinforcing matrix form of network of interlocking thin flakes on to which cement particles bond. Ground mica is also used in all types of sealers for porous surfaces, such as, wallboard masonry and concrete slabs to reduce penetration and improve holdout. It permits a thicker film to be applied and at the same time reduces sagging. Cracking is reduced by the reinforcing action of the mica flakes and gaps and holes in rough masonry are bridged by mica mixed compound applied.


Ground mica is used in lightweight fire-resistant prefabricated gypsum wallboard slabs and panels in replacement of asbestos where thermal insulation and acoustic qualities are of particular importance. These slabs manufactured from mixture of ground mica, gypsum and cement compounded in different proportion after suitable curing by means of a number of formulations are fitted to individual sections of steel work according to suitability in building constructions. They could be self finished and could be plastered or otherwise treated to provide a decorative finish. They possess excellent characteristics of high heat conductivity, super tensile strength, as well as, low bulk density. The compounds are non-combustible, free flowing, chemically inert, resilient and non-abrasive. They have good thermal insulation properties and an excellent characteristic for sound absorption. Low shrinkage and coefficient of expansion, good dimensional stability, extremely low water absorption are some of its additional outstanding features which make mica an ideal product for use in the above applications.


Mica is extensively used as a pigment extender in various paints, namely, emulsion or synthetic water paints, exterior paints, anti-corrosive paints, aluminum paints, marine paints, oil based metal primers etc. Mica acts as a reinforcing pigment to reduce checking and cracking while at the same time controls chalking in outside latex, oleo resinous, alkyd, and alkyd-modified latex exterior paints. It also reduces penetration into porous surfaces while providing excellent adhesion. In addition, mica reduces running, sagging, improves weather ability and brush ability. It easily disperses in liquid/solid coating systems. It mechanically reinforces paint film and imparts greater resistance to electricity, heat, light, moisture and chemicals. The overlapping layers of mica platelets form a tough shield that improves paint integrity and durability. It increases resistance to water penetration, at the same time brightens the tone of the colored pigments. Mica is also used as an extender and filter in certain texture and traffic paints. Not only does its inclusion mean a greater saving in cost by replacing more expensive pigments, but it also enhances certain essential paint properties. Mica particles are stronger than iron and are not brittle like other inert materials. Finely ground mica particles reinforce a protective coating in almost the same way that steel rods reinforce concrete or glass is reinforced by wire. It is an anti-friction, anti-fouling, anti-settling, anti corrosive, anti-tarnish and anti-siege agent It is a superior reinforcing pigment that acts as a sealer over porous surfaces and reduces penetration and flushing. Moreover, it improves the moisture resistance of protective coatings and their adhesion to all types of surfaces.

Mica is also one of the most inert substances. Thus it helps protect the paint coating against acid and alkali attacks from deterioration due to heat or sunrays from atmospheric gases and moisture. It also decreases blistering and staining from the substrates.


Mica, due to its highly delaminated flake structure, is suitably used in large proportion as non-asbestos fillers that provide reinforcement and improve physical properties of the mica-plastic composites. Mica improves material properties of plastic composites significantly. Addition of mica results in higher heat distortion temperature, increased flexural modulus, increased flexural strength, reduced shrinkage, better chemical resistance, reduced permeability, better dielectric properties and better surface properties to plastic composites. As a rigid flake, mica provides mechanical reinforcement along a plane rather than a single axis as in the case of a glass fiber. It is particularly used in thermoplastic polymers, e.g. PP, PST, PET, HDPE, ABS and Nylon 6/6, thermosets and elastomers plastic compounds.


Some of the latest research and testing have resulted in extensive use of mica in place of asbestos in acoustic compounds in automotive plastics that change vibrations and control noise. It is used in air condition fan blades, dashboard panels, head lamp assemblies, fan shrouds and floor flake to strengthen lightweight plastic seat backs, load floors, grill panels, ignition system parts, and air condition and heater valve housings. Automakers throughout are now encouraged to apply increasing quantities of mica in acoustic compounds that changes vibrations and eliminate road and engine noise which are fine examples of mica filled polypropylene products found in automobiles.


Mica is used in rubber tyres and other products as anti-sticking and anti-friction compounds between the inner rubber and castings of rubber tyres used in airplanes, automobiles and motor bikes. It is used as a dusting and releasing agent, as well as, inner filler to reduce gas penetration and shrinkage during molding. The use of mica permits adhesion of rubber compounds to the cores and other sheathes during vulcanization. It permits air and moisture to escape during curing and helps create a uniform pore structure that leads to improved resiliency.


Mica is used as a flux coating on mild steel rutile (titandioxide) based welding electrodes as a lagging compound. The mica coating provides two distinct types of protection to the welding electrodes: 1) it serves in forming a fusible slag and a good seal at the fusion zone on the arc, 2) it resists the action of heat, gaseous and other surrounding atmospheric oxidation. Nothing can substitute mica for the above application. In fact it is the nature of mica coating that largely determines the quality of a welding electrode.


Mica is used as an effective mud additive in water based oil well drilling operations to prevent loss of circulation and seepage in loose formations. The coarsely ground mica flakes act as a sealant and bridge the openings by sealing porous sections of the drilling hole. It helps to keep the solids in suspension.


Mica is used as a surface coating to prevent sticking in asphalt roofing felts and shingles; as an ingredient in special axle greases for railway wagons; as a boiler and steam pipe lagging compound to provide heat insulating properties; as a coating for foundry cores and mould release compounds in metal castings; as an absorbent in explosives and disinfectant automotive components; as a thermal insulation to refractory bricks, slabs and tiles; in cosmetic products to provide a pearly luster and glittering effects; as a filler in magazine papers to provide higher stiffens, lower density and higher permeability; as a 'flux' in porcelain and ceramic wares to add plasticity analogues in the clay; as an additive in special printing inks to obtain consistency; as a decorative coating in wallpapers to provide luster effects and glittering etc.

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