backing mica these are small cut pieces of mica to be used on both sides of silver mica, to give mechanical strength to mica stacks for building mica capacitors.
transistor parts power transistors and diodes need an insulation to prevent excessive heat reducing their performance, precision punched mica washers help the transistor to be insulated from the chassis and to dissipate the heat away from the transistor and other semi-conductors.
trimmer mica made of stacked mica dielectric capacitance units, between two spring nonferrous metal conducting plates ; mounted within a ceramic container, or on a ceramic base. Adjusting screw provides variable compression on the formed metal plate separation.
heat resisting micanite heat resisting micanite is made from high quality mica splittings with the shellac bond being kept low. The material is made available from both muscovite and phlogopite mica where the maximum working temperature are approximately 600° c and 900° c respectively. Heating resisting micanite is used in the manufacture of a wide variety of both domestic and industrial heating applications such as electric iron elements, wound heater elements, cylindrical resistance heaterse etc.
tubes and bushes icr has perfected the ability to make tubes of the very highest quality from micanite. Specially selected grades of splittings are used for this purpose in order to ensure the possibility of being able to roll even the smallest diameter tuebes. Micanite tubes and bushes are used extensively in a wide variety of electrical switchgear and control gear as well as in large variable resistances, brush holder assemblies and commutator.
pieces of mica block having a thickness range between 2 mils to 7 mils are classified as mica thins. These are used to manufacture fabricated mica, description of which has been given elsewhere in this book.
crimped / corrugated mica this is made from muscovite mica of bihar origin which withstands high temperatures of above 700c. Corrugated mica is supplied as per customer’s specification. The main use of this type of mica is in soldering irons.
mica for liquid level indicators mica being unaffected by high temperature and high pressure, is an ideal optical medium for checking the measurements in boilers for liquid level and pressure of steam.
mica washers these are mica discs of inferior quality with round opening in the centre, which can be bonded by shellac or epoxy into considerable lengths. Maximum use is in railways.
strainer core sheet mica having 22 to 93 holes are used as strainers in brass, bronze, aluminium sand castings. Mica strainer, acting as both choked and strainer during pour, helps to eliminate getting casts, dross, contaminated, reduces polishing belt costs, and produces a better and brighter casting. Being inorganic, strainer is easy to place over the sprue holec
Mica Capacitor High Voltage High Current Cylindrical
withstandvoltage
:
when ac voltage is applied graduall between the terminals from zero to the spcified value, which is "rms value equal to the rated peak voltage" and full potential is applied for 5 second minimum at a frequency 100 hzs less, there will be no damage, arcing or break down.
dissipation factor
:
df limit 1000pf - 0. 004 measured at 1mhz & 1000pf -0. 0015 measured at 1khz
insulation resistance
:
better then 7500 m - ohms after 1 minute application100vdc
operating temperature
:
-55°c to +125°c
case insulation
:
the encasing of the capeciters will with stand an volage after the terminals are connected together and the case is touched by metel electrode at 60 hz peak ac potential eqal to two times rated pwv with out acing, breakdown or damaging for a duration of 1 to 5seconds
sintered chips in this type, multiple layers of over-the-edge printed mica are stacked together. These units do not have any foil but use the silver itself for the purpose of termination. The units are edge bonded using high content silver paste on which the terminals are directly soldered
silvered mica plates cut condensor films are thoroughly cleaned with the help of de-greasing agents and are then silvered on both sides by screen printing process. There is perfect adhesion between mica and silver which results in optimum performance of the plates. Variations on thickness of the silver deposited affect the dissipation factor of the plate, while the overlapping print area of the silver (electrode) and the thickness of the mica (dielectric) control the capacitance of the plate. Individual plates are used in the manufacturing of single film mica capacitors, whereas multiple pieces are used for all other types. These plates are printed for multiple patterns to reduce the manufacturing cost involved therein and in the onward
mica stacked units multiple layers of parallel printed silvered mica plates interleaved with foil, usually of tin/lead, are used for the manufacture of the stacked units. The capacitance per plate is calculated and a pre-determined number of plates are stacked together to arrive at the required capacitances for the finished capacitors. Thick pieces of plain mica is used as backing on either side to reinforce the units. The finished units are then dipped in varnish and subjected to pressure with heat to make the units compact.
stacked mica sections the individual pieces of stacked units are cut into sections with the means of a saw cutting machine or a gang cutting machine. The cut units we get after the cutting are literally the capacitors themselves, apart from having the terminals and the coatings. All the processes for testing of the various electrical properties are carried out at this stage on the unit.
moulded mica capacitors the units with terminals are moulded with electronic grade epoxy. The process used is that the units are placed in specifically designed mould boxes and liquid epoxy is poured into these boxes. These are then cured in air circulating ovens. The resultant product is a hard epoxy coated capacitor. This is specially needed where the terminals are of axial version, which cannot be dip coated, and also for very high voltage transmitting type capacitors.
mica flakes is mica scrap ground into sizes ranging from 2 mesh to 30 mesh. This material is prepared mainly by the means of rotary hammer crushing machine in which the mica is literally beaten till such time that the required size is not achieved and the material passes out from graded sieves attached therein.
the house of icr has recently commissioned a customized sieving plant to uphold the tradition of customer satisfaction that it so profoundly propagates. This new plant, built at a substantial cost, has all the features that may be required for production of any type of graded mica powder.
Washers washers made from our own heat resisting and moulding micanites are used in electro-magnets, micro-sensitive control gear and for many other purposes. They are either cut or die stamped from the sheet material according to the customers' drawings.
Commutator / Punched SegmentMica This product is prepared by pasting Muscovite splittings with an alkyd varnish as a binder in a little amount and processing at a very temperature and high pressure and then grinded .
Mica condensor films Pieces of high quality mica having thickness generally less than 2 mils are classified as condensor films. These films are used in the manufacture of silver mica plates used in mica capacitors.
glass sheet and tape material mica tape material has always been an essential part of the insulation of large rotating machines. This situation still applies today though, for many applications, tapes made from mica splittings have been superseded by tapes made from mica paper. Dplittings based tapes are still essential where a certain amount of flexibility is required as in end windings of turbine generators, high voltage cables, etc. . A large variety of combinations of backing material, bonding agent and thickness of mica is available according to the specification of the particular customer.
mica after extraction from the mines is sorted out and the pieces having area larger than 1" sq. And up and a having a thickness of 7 mils and up are classified separately as mica blocks. This mica is the basic raw material for all the various types available for export apart from mica scrap, flakes and powder. These pieces after undergoing size and quality classification as defined in other pages are exported. Mica blocks are irregular in shape.
mica scrap is the nomenclature given to the irregular lumps of mica as received from the mines having a area between 1/2" and 1 1/2" sq. This type of mica is mainly exported to plants all over the world to be made into a pulp used for the manufacturing of mica paper and reconstituted mica plates. Domestically, it is used as a raw material for the manufacture of mica flakes and powder.
mica splitting pieces of medium quality mica having a thickness of less than 1 mil are classified as mica splitting. These splitting are supplied either "bookform" type or "loose" type. These splitting are used in the manufacture of micanite related products
heating elements due to electrical insulation, it is used in irons, toasters, kettle, rice cooker, hair drier, etc. In all these applications, the electrical wire is wound around the mica.
Micafolium Paper Micafolium is a traditional insulating material having many applications for general purpose work and in particular for the insulation of bus bars. It is made by bonding clear Mica Splittings onto Electrical Kraft Paper by means of a Shellac bond. It is supplied in the form of rolls and are mainly used for the manufacture of cones for assembley for commutators, sleeves for insulation of bearings, slot cell, clamps and tubes.
Commutator vee rings vee rings are made from the high quality moulding micanite which is made at our works. The hand moulded process gives excellent results but is a very labour intensive and slow method of production. It therefore tends to be used mostly for very large rings where quantities are relatively small
vaccum tubes in the form of bridges or spacers, sheet mica is used in thermionic vacuum tubes, and these serve to hold the tube elements in position, insulated from each other and at uniform distances.
Dev Tech India Private Limited Manufacturer and supplier of mica powder which includes dev mica, formulated dev mica, flexible dev mica, transparent dev mica, water proofing dev mica and pigment extender dev mica.
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