Mica Powder / Sheet / Lumps / Raw


The mica mineral group includes 34 phyllosilicate minerals, all with a layered, platy texture. The mineral has been known for millennia: Mica was first mined in India about 4,000 years ago, where it was used primarily in medicines. The Mayans used it for decorative effect in stucco to make their temples sparkle in the sun. Today it is used in everything from electrical products to makeup.

Mica is highly reflective, and its excellent cleavage allows it to split into thin sheets; these tough, flexible sheets are the distinguishing characteristic of the mineral group. Thin sheets are transparent or, if deeply colored, translucent. Micas are stable when exposed to electricity, light, moisture and extreme temperatures.

PreRish Tri Exim Pvt. Ltd. (PEPL) is the reckoned name worldwide for its quality Mica products. PEPL is the biggest supplier and exporter of Mica of any form accordance to the required grade.

Chemical Names: MICA; Muscovite
Molecular Formula: KAl2[AlSi3O10](OH)2 or Al2K2O6Si
Molecular Weight: 256.239 g/mol


Types and Uses of Mica:

  1. Commercial Mica
  2. Principal Mica

Commercial forms of mica can be grouped as either unmanufactured or manufactured. Unmanufactured mica can be divided into two classes: 1. sheet mica and 2. Scrap mica, which includes flake mica. The majority of manufactured mica, which has been shaped or punched, is used in electrical products.

Principal forms of mica minerals used in commercial applications are biotite, muscovite and phlogopite. Biotite is generally used in its ground (particulate) form as a soil additive; muscovite and phlogopite have applications in sheet and ground forms. Muscovite sheet mica is recovered only from pegmatite deposits; phlogopite sheet mica is recovered from pyroxenites.

Muscovite is the principal mica used by the electrical industry to manufacture mica-based capacitors capable of operating at temperatures or frequencies that are destructive to polypropylene capacitors. Phlogopite mica is used in plastic composites for automotive applications because of its dimensional stability, increased stiffness and improved heat distortion temperature.

Mica also used as Welding Electrodes Cables and Wires Foundry Works Texture Paints Acoustical Plaster Ceiling tiles Plastics Oil Drilling Wells and in Beauty Products.




Characteristic Unit Muscovite
Colour Silver / Ruby / Green
Density gm/cm3 2.6 – 3.2
lb/ln3 0.095-0.116
Specific Heat 0.21
Hardness Moh Scale 2.8 – 3.2
Shore Test 80 – 105
Optic Axial Angle 55 – 75
Tensile Strength kgf/cm2 about 1750
lbf/in2 about 25000
Shear Strength kgf/cm2 2200 – 2700
lbf/in2 31000 – 38000
Compression Strength kgf/cm2 1900 – 2850
lbf/in2 27000 – 32000
Modulus of Elasticity kgf/cm2 x 10-3 1400 – 2100
lbf/in2 X 10-6 20 – 30
Coefficient of expansion per °C perpendicular to cleavage plane 9 X 10-6 – 36 X 10-6
Calcining Temperature C 700 – 800
F 1290 – 1470
Maximum operating temperature C 500 – 600
F 930 – 1110
Thermal conductivity
Perpendicular to cleavage planes Gm.cal/sec/cm2/C/cm about 0.0013
BTU/hr/ft2/0f/ft about 0.31
Parallel to cleavage planes Gm.cal/sec/cm2/C/cm
Water of constitution % 4.5
Moisture absorption Very low
Apparent electric strength 0.001″ to 0.003″ KV/mm 120 – 200
thick Volts per 0.001″ 3000 – 5000
R.M.S. at 15° C (60°F) 0.01″ to 0.05″ KV/mm 40 – 80
thick Volts per 0.001″ 1000 – 2000
Permittivity at 15°C(60oF) 7-Jun
Power Factor (loss tangent) @ 15° C (60° F) 0.0001 – 0.0004
Volume Resistivity 25° C (77° F) ohm cm 40 x 1013-2 x 1017
Acid reaction Affected by Hydrofluoric Acid


Silica (SiO2) 45.57%
Alumina (Al2O3) 33.10%
Potassium Oxide (K2O) 9.87%
Ferric Oxide (Fe2O3) 2.48%
Sodium Oxide (Na2O) 0.62%
Titanium Oxide (TiO2) Traces
Calcium Oxide (CaO) 0.21%
Magnesia (MgO) 0.38%
Moisture at 100oC 0.25%
Phosphorus (P) 0.03%
Sulphur (S) 0.01%
Graphite Carbon (C) 0.44%
Loss on Ignition (H2O) 2.74%