Trade.Information

Company Name: Mica Manufacturing Co. Pvt. Ltd

Company Type: MANUFACTURING

Company Profile

Established : In 1885 Incorporated as a Private Limited Co. on 24.11.1948
Capital : Authorised : Rs.50,000,00.00
Paid-up : Rs.20,000,00.00
Directors : (1) Mr.M.L.Rajgarhia, Chairman & Mg.Director
(2) Mr.A.V.Rajgarhia, Director
(3) Mrs. K.D. Rajgarhia, Director
(4) Mrs. M.D. Rajgarhia, Director

Branches : Main Factory P.O. Box 63, I.C.R.Road, GIRIDIH-815301 (Bihar) Phone : (06532) 22955 & 24155 Micanite, Mica Powder/Flakes Factory SIRSIA GIRIDIH-815301 (Bihar) Phone : (06532) 22954 Mining Office P.O. Jhumri-Telaiya - 825409 Station : Kodarma, (Bihar)

About Company

The dictionary defines mica as "A class of silicates having a prismatic angle 120o, eminently perfect basal cleavage, affording thin tough laminae or scales, colorless to jet black, transparent to translucent, of widely varying chemical composition, and crystallising in the monoclinic system". In brief, mica is a generic term applied to a group of a complex aluminosilicate minerals having a sheet or plate like structure with different chemcial compositions and physical properties. All micas from from flat six-sided monoclinical crystals with a remarkable cleavage in the direction of the large surfaces,which permits them to split easily into optically flat films, as thin as one micron in thickness. When split into thin films, they remain tough and elastic even at high temperature. What makes micas so important to command such a unique position ? Because it had been gifted with exceptional values. It possesses some of the most outstanding combination of chemcial, physical, electrical, thermal and mechanical properties which are not found in any other product. Physically: Mica is transparent, optically flat, easily splittable into thin films along its cleavage, colourless in thin sheets, resilient and incompressible. Chemically: 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. Electrically: 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 noted for its resistances to arc and corona discharge with no permanent injury, and has little or no effect when exposed to electronic radiation dosages up to 1018 nvt. Thus maintaining its a-c dielectric material when exposed to the oxidising action of electrical discharges either on the surface or within internal gas spaces in built-up mica insulation. Thermally: Mica 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. Mechanically: Mica is relatively soft and can be hand cut, machined or die-punched. It is flexible, elastic and tough, having high tensile strength. It can withstand great mechanical pressure perpendicular to plane but the lamination have cleavage and can be easily split into very thin leaves. Mica minerals are an essential constituents of various igneous rocks, such as granite, metamorphic rocks and igneous rocks. Mica content of most of these rocks is low and the crystal size is small, not economical for commercial explorations. Economic deposits of muscovite mica containing large crystals of these minerals are only found in granitic or acidic pegmatites intruding mica schists. The best quality sound muscovite sheet mica occurs in regions of earth relatively free from earthquake and volcanic disturbances. It crystallizes in monoclinic system in a rock formation called acid pegmatites having mineral composition as ordinary granite, felspar and quartz, etc. The occurrence of economic deposits of phlogopites confined to areas under lain by large batholithic masses of basic phrozenic rocks in asociation with calcite, apatite, limestone, dolomite, talc, marble or serpentina and phospate rocks but rarely in granite pegmatites. The mode of formation of mica, which is found in the shape of slabs (books), cleavage into the fine laminae, is still the subject of active research. However, it has been proved by practical experience that the degree of absence of orthoclase felspar in the pegmatites to a great extent is indicative of the presence of economic deposits of mica in a vein. This establishes that mica forms at the expense of orthoclase felspar. The presence of tourmaline crystals and decomposed felspar in the pegmatite also indicates the possibilities of finding good deposit of mica as has been found true in the case of mica fields of Bihar (India). Natural mica is not like other commercial materials which could be produced by a machine and purchased by the square yard. It is a mineral of natural occurrence which has to be dug out from below the earth's womb, some time as deep as 1000 feet vertically below the surface, at immense costs and ardous labour. The mineral has to be spotted by means of prospecting, surveying and assaying the rock. The earth nursed and the material produced with great skill by drilling and blasting mineral rocks.