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 :-

(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.
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
Availability	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	C	120
Intermittent service	C	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	Application
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.	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	°C	130°C
Thickness tolerance	mm	As per NEMA FI-1-1996 Grade 6
Binder content	%	9 – 18
Dielectric strength	kV/mm	12 min

Composition	Application
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.	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	Thickness :	Tolerance :
1000 x 525mm +/- 10mm	as per drawings and specification	0.40 - 1.6mm	+/- 0.025mm

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

Composition	Application
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.	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 - EFP - 01	6 1st / 6 DL Ruby	10 - 20
ST - EFP - 02	6 DL Ruby 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	Application
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.	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 - EFP - 01	6 1st Amber (Phlogopyte)	3 – 5
ST - EFP - 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	Application
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.	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	130
Thickness Tolerance	mm	Avg. ± 0.025, individual ± 0.050
Binder content	%	03 – 08
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 /cm2 pr. %		At R.T. - 3 max. At 200°C - 2 max.

Different Grades :-

Sheet Size :	Punched part :	Thickness :	Heat Stability °C
ST-SSP-01	6 1st Ruby (Phlogopyte)	6 – 8	185
ST-SSP-02	6 1st Ruby / 6 DL	3 – 5	200
ST-SSP-03	6 1st Ruby / 6 DL (Phlogopyte)	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	Packing
6 months from the date of manufacture @ below 20°C	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.

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

Availablility:-

Code No.	Punched part :	Thickness :	Tolerance :
1000 x 525mm +/- 10mm	as per drawings and specification	0.40 - 1.6mm	+/- 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 Packing

6 months from the date of manufacture @ below 20°C 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.

Property Unit Value

Mica Content % Min 93

Binder Content % Max 7

Colour - Brown

Thermal Class - F (155C)

Volatile Content % <1

Compressibility 600kg/cm2 <3%

Availablility:-

Sheet Size : Thickness : Tolerance :

1000 x 525mm +/- 10mm 0.25 - 1.5mm +/- 0.050mm

Composition Application Processing Shelf Life

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 For hot moulding of intricate parts, such as mica commutator cones, end bell insulation, slot cells, coil forms, tubes etc. 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. 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) ½ 0.025, over 24 mil ½ 0.050 Individual ½ 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 Application Processing Shelf Life

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 For hot moulding of intricate parts, such as mica commutator cones, end bell insulation, slot cells, coil forms, tubes etc. 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. Six months at 20°C from the date of manufacturing.

Properties Unit Properties

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%

Sheet Size :	Thickness :	Tolerance :
1000 x 525mm +/- 10mm	0.25 - 1.5mm	+/- 0.050mm

Composition	Application	Processing	Shelf Life
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	For hot moulding of intricate parts, such as mica commutator cones, end bell insulation, slot cells, coil forms, tubes etc.	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.	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) ½ 0.025, over 24 mil ½ 0.050 Individual ½ 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

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

Composition	Application	Processing	Shelf Life
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	For hot moulding of intricate parts, such as mica commutator cones, end bell insulation, slot cells, coil forms, tubes etc.	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.	Six months at 20°C from the date of manufacturing.

Properties	Unit	Properties
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%