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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 Russia. |
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| Mica's
chemical composition places it in the aluminum silicates group.
Two types are extracted: |
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- Muscovite,
in which there is a predominance of potassium.
- Phlogopite
in which the presence of magnesium can be detected.
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- 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.
- Natural
mica has a dielectric strength greater than 25 kV/mm, has good
resistance to arcing and electrical erosion and is permeable
to microwaves.
- Mica is
tolerant of water and most chemical agents, such as solvents,
acids, bases and mineral oils.
- Mica has
good compressive strength. It behaves well in the presence of
tensile and bending stresses. It has a high modulus of elasticity.
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Muscovite |
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Phlogopite |
K
Al2 (AL Si3 O10) |
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K
Mg3 (Al Si3 O10) |
(OH)2 |
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(OH)2 |
This
is the most widespread mineral and the name comes from the city
of moscow - in the Middle Ages, large deposits were used nearby
to make windows. It contains potassium and is light in appearance. |
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Phlogopite
contains magnesium and is dark in appearance. |
The
mechanical properties are better that Phlogopite. |
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It
can withstand higher temperatures that Muscovite. |
Available |
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| The following
products are available from Presspahn via our partner COGEBI: |
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