lamina

Natural Mica Base

SmithLamina Natural mica base insulating materials are made by using processed raw mica mineral. The electrical, mechanical and thermal properties of natural mica fulfill the need of insulation in high temperature area up to 1200 degree. The crystalline structure and splitting characteristic of mica is used to manufacture different products as per needs.

Raw Mica is processed to Mica Blocks. Mica blocks are splitted layer by layer to make Mica splittings of required thickness. This Mica splitting are bonded together with different bonding Agent like Shellac, Alkyd Vinyl, Epoxy, Silicon to make rigid and flexible sheets or plates.

Download Datasheet and properties

Four types of Natural Mica Base are :-

 
HRM Sheet Flexible Micanite Sheets Segment Plates Moulding Micanite Sheets
  • i) HRM Sheet :-

    About Manufactured from specially selected mica splitting, incorporating a low level synthetic binder and compressed in high pressure with heat. This gives a rigid material, which can be punched or cut to shape.
    Properties & Applications Manufactured from specially selected mica splitting, incorporating a low level synthetic binder and compressed in high pressure with heat. This gives a rigid material, which can be punched or cut to shape.
    Availability Size : 1000 mm x 1000 mm +/- 10mm
    Thickness : Min 1mm , Tolerance +/- 10%
    Storage Unlimited shelf life in a dry place at room temperature.

    Characteristics :-

    PROPERTIES UNIT VALUE
    Mica Content - Max % 95
    Binder content - Min % 5
    Density   2.2 gm/cm3
    Heat resistance : Continuous service
    Intermittent service
    C
    C
    120
    150
    Tensile strength N/mm2 >75 N/mm2
    Flexural strength N/mm2 >200 N/mm2
    Water Absorption % <0.5%
    Dielectric strength KV/mm >30 kV/mm
    Thermal classification Grade class - B
  • ii) Flexible Micanite Sheets :-

    Composition SmithLamina ST - AFP is a flexible mica plate made from mica splittings bonded with flexible Alkyd resin. The plate exhibits excellent flexibility and formability at room temperature. There are different grades available depending on the type of mica & binder content.
    Application For class "B" applications such as mechanical pads, D.C. coil separators, cone insulation, pads of field coils, under cross cover & lead terminals.

    Product Data :-
    Property Unit Value
    Thermal classification °C 130°C
    Thickness range mm 0.13 – 0.76
    Thickness tolerance mm As per NEMA FI-1-1996
    Grade 6.
    Binder content % 9 – 18
    Dielectric strength kV/mm 12 min
    Composition SmithLamina ST-EFP is a flexible mica plate made from mica splittings bonded with flexible Epoxy resin. The plate exhibits excellent flexibility and formability at room temperature. There are different grades available depending on the type of mica used & binder content.
    Application For class "F" applications such as mechanical pads, D.C. coil separators, cone insulation, pads of field coils etc.

    Product Data :-
    Property Unit Value
    Thermal classification °C 155
    Thickness range mm 0.125 - 0.76
    Thickness tolerance mm As per NEMA FI-1-1996
    Grade 6
    Binder content % 7 - 20
    Volatile content % 0.5 max.
    Dielectric strength kV/mm >12

    Different Grades :-
    Code No. Mica type Binder Content, %
    ST - EFP - 01 5 BF Ruby 13 - 27
    ST - EFP - 02 6 1st Ruby / 6 DL Ruby 07 - 12

    Available size of sheets 1020 mm X 1020 mm 10 mm 1020 mm X 510 mm 10 mm
    Composition SmithLamina ST - SFP is a flexible mica plate made from mica splittings bonded with flexible Silicone resin. The plate exhibits excellent flexibility and formability at room temperature.
    Application For class "H" applications such as mechanical pads, traction motor coil separators, cone insulation, pads of field coils etc.

    Product Data
    Property Unit Value
    Thermal classification °C 180
    Thickness range mm 0.30 – 0.76
    Thickness tolerance mm As per NEMA FI-1-1996
    Grade 86.
    Binder content % 10 ± 2
    Dielectric strength kV/mm >12

    Different Grades :-
    Code No. Mica type Binder Content, %
    ST - SFP - 01 6 1st / 6 DL Ruby 10 - 20
    ST - SFP - 02 6 DL Ruby 08 - 10

    Available size of sheets 1020 mm X 1020 mm 10 mm 1020 mm X 510 mm 10 mm
  • iii) Segment Plates :-

    Composition SmithLamina Epoxy Segment Plates is a built-up Epoxy bonded segment plate milled to IEC 371 thickness tolerances. It has excellent heat stability. There are different grades available depending on the type of mica used.
    Application This plate is specially suited to segment insulation in commutators of traction motors. 02-97 can be supplied in the form of sheets or punched segments, which can also be supplied stack gauged to ensure precise dimensional control on built-up commutators.

    Property Unit Value
    Thermal Classification °C 155
    Thickness range mm 0.40 - 1.85
    Thickness Tolerance mm Avg. ± 0.025
    Individual ± 0.050
    Binder Content % 03 – 05
    Dielectric Strength kV/mm 22 min.
    Heat stability as per IEC 371-2-11 ;
    300°C / 600 kg/cm2 / 30 minutes
      No exudation of binder & no mica displacement
    Compressibility as per IEC 371-2-12; at 600 kg /cm2 pr. %   At R.T. - 3 max.
    At 200°C - 2 max.

    Different Grades :-
    Code No. Mica Type Binder Content %
    ST-ESP-01 6 1st Amber (Phlogopyte) 3 – 5
    ST-ESP-02 6 1st Ruby / 6 DL 3 – 5

    Available size of sheets 1020 mm X 1020 mm 10 mm 1020 mm X 510 mm 10 mm
    Composition SmithLamina Shellac segment plate is built-up Shellac bonded mica splitting milled to NEMA grade 3 thickness tolerances. There are different grades available depending on binder content & thermal stability.
    Application This plate is specially suited to segment insulation in commutators of traction motors, automobiles, hand tools and other industrial motors. Shellac Segment plates can be supplied in the form of sheets or punched segments, stack gauged to ensure precise dimensional control on built-up commutators.

    Properties Units Value
    Thermal Classification °C 130
    Thickness Tolerance mm Avg. ± 0.025, individual ± 0.050
    Binder Content % 03 – 08
    Flexural Strength N/mm2 125 min
    Dielectric Strength kV/mm 22 min
    Heat stability as per IEC 371-2-11; 185°C— 250°C / 600 kg/cm2 / 30
    minutes
      No exudation of binder &
    no mica displacement
    Compressibility as per IEC 371-2-12; at 600 kg /cm 2 pr. %   At R.T. - 4 max.
    At 160°C - 3 max.

    Different Grades
    Code No. Mica Type Binder Content % Heat Stability °C
    ST-SSP-01 6 1st Ruby 6 – 8 185
    ST-SSP-02 6 1st Ruby / 6 DL 3 – 5 200
    ST-SSP-03 6 1st Ruby / 6 DL 3 – 5 250

    Available size of sheets 1020 mm X 1020 mm 10 mm 1020 mm X 510 mm 10 mm

    ST-AV2 Alkyd Vinyl resin bonded splitting mica based rigid sheet,milled to IEC 371 thickness tolerances.This plate is used in segment insulation / separator in Commutator of Traction Motor.The sheets are milled, uniform bond, smooth, trimmed edge, free from any hard patches and holes.

    Shelf Life 6 months from the date of manufacture @ below 20°C.
    Packing The sheets stacked to required quantity as per customer requirement. Stacked sheets are wrapped with moisture proof plastics and securely packed to strong cartons or wooden box.

    Properties Units Value
    Mica Content % Min 93
    Binder Content % Max 7
    Colour - Brown
    Thermal Class - F (155C)
    Dielectric Strength kV/mm >22
    Volatile Content % <1
    Compressibility 600kg/cm2 <3%


    Availablility :-
    Sheet Size : 1000 x 525mm +/- 10mm
    Punched part : as per drawings and specification
    Thickness : 0.40 - 1.6mm
    Tolerance : +/- 0.025mm
  • iv) Moulding Micanite Sheets :-

    ST-AV1 Alkyd Vinyl based splitting mica sheet is a moldable sheet, meet to NEMA Grade 2.

    This is hot formable material widely used in Commutator V Rings, Traction Motor end bells, slot cells, coil forms, cones and tubes.

    Alkyd Vinyl Mould plates are mold under pressure 200-490 PSI and heat to 160C- 200C till softening the bond and cooled down under pressures to retain its shape as per mold. The heat and pressure timedepends on final properties and size of Molded parts.

    The sheets are uniform bond, smooth, trimmed edge, free from any hard patches and holes.

    Shelf Life 6 months from the date of manufacture @ below 20°C.
    Packing The sheets are interleaved with plastic Sheet and stacked to such quantity. Stacked sheets are wrapped with moisture proof plastics and securely packed to strong cartons or wooden box.

    Properties Units Value
    Mica Content % Min 93
    Binder Content % Max 7
    Colour - Brown
    Thermal Class - F (155C)
    Dielectric Strength kV/mm >20
    Volatile Content % <1

    Availablility :-
    Sheet Size : 1000 x 525mm +/- 10mm
    Thickness : 0.25 - 1.5mm
    Tolerance : +/- 0.050mm
    Composition SmithLamina mica moulding plate is a hot forming plate conforming to NEMA grade 2. Epoxy resin binder in Epoxy Mould Plate is partially cured, so that it will soften under heat and facilitate good moulding.
    Application For hot moulding of intricate parts, such as mica commutator cones, end bell insulation, slot cells, coil forms, tubes etc.
    Processing The layout comprising of the required number of layers of thin mica moulding plates (cut to definite shape), is set in a pre determined pattern. It is then heated uniformly to a temperature of 130C- 150C, till it becomes soft. It takes the required form when moulded under pressure. It retains its form when cooled under pressure. The duration, temperature and pressure will have to be determined by application. These moulded parts, if required, can be fully cured under heat and pressure for several more hours to develop their full properties.
    Shelf Life Six months at 20°C from the date of manufacturing.

    Property Unit Value :-
    Thermal Classification °C 155
    Thickness mm 0.25 - 1.5
    Thickness Tolerance mm Avg. - Upto 24 mil (0.6 mm) 0.025, over 24 mil 0.050 Individual 0.075
    Binder Content % 12 - 15
    Mouldability - When 2 inch wide strip is heated (135C - 150C) & moulded over a mandrel of specified diameter: no deflaking to be observed.
    Dielectric Strength kV/mm >20

    Different Grades :-
    Code no: Mica Type Binder Content Milled/unmilled
    ST-EMP-01 No.6, 1st Ruby 14 - 20 Unmilled

    Available size of sheets 1020 mm X 1020 mm 10 mm 1020 mm X 510 mm 10 mm
    Composition SmithLamina mica moulding plate is a hot forming plate conforming to NEMA grade 2. Epoxy resin binder in Epoxy Mould Plate is partially cured, so that it will soften under heat and facilitate good moulding.
    About Molding Micanite Sheets are built from best quality mica splitting with a high quality Natural Shellac binder under specific heat and pressure to from a rigid sheets.
    Properties & Applications Molding Micanite sheets have the properties of flexible on warm and harden when cooling. This Micanite sheets have very good mechanical and electrical strength.
    Application for high temperature Heating barrier and electrical insulation purposes, lampshade etc.
    Availability As per customer specification. Width x Length : Max 1000mm.
    Storage Unlimited shelf life in a dry place at room temperature.

    Characteristics :-
    Properties Unit Value
    Mica Content Min % 80
    Binder Contents Max % 20
    Density Gm/cm3 2.1
    Colour - Golden Brown
    Thermal classification Grade B (130°C)
    Dielectric Strength Kv/mm >10
    Tensile strength N/mm2 >75
    Flexural strength N/mm2 >200
    Thickness tolerance mm +/- 10%

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