Mica
Natural Mica
Natural mica has exceptional physical characteristics. It can be found throughout the world, most notably in the presence of Paleozoic rocks. Accessible deposits are located primarily in India, on the American continent, in southern Africa and in Russia.
Mica's chemical composition places it in the aluminium silicates group. Two types are extracted - Muscovite, in which there is a predominance of potassium and Phlogopite, in which the presence of magnesium can be detected.
As a mineral, mica has a special characteristic - it can be cleft to obtain very thin flakes of constant thickness.
Properties
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THERMAL
Mica can withstand temperature in excess of 1000°C/1830°F (Phlogopite), it is flame-retardant, non-flammable, does not give off fumes, and conducts very little heat, especially perpendicular to its strata. |
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ELECTRICAL
Natural mica has a dielectric strength greater than 25kV/mm (625V/mil), has good resistance to arcing and electrical erosion, and is permeable to microwaves. |
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CHEMICAL
Mica is tolerant of water and most chemical agents, such as solvents, acids, bases and mineral oils. |
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MECHANICAL
Mica has good compressive strength. It behaves well in the presence of tensile and bending stresses. It has a high modulus of elasticity. |
High performance thermal and electrical insulation plates
Cogetherm is the name given to our mica laminates designed for extreme conditions, requiring one or more of the following characteristics:
- very good heat retarding and even flame resisting properties
- low thermal conductivity
- very good electrical insulation properties
- high mechanical strength, particularly in compression, even at high
temperatures
- low sensitivity to chemical agents, especially oils and greases
- asbestos-free and non-toxic
Cogetherm is used in different areas of application including as a replacement for asbestos.
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