Nov 11, 2016
Different Types of Mica

Muscovite Mica – KAl2(AlSi3O10)(OH)2 – has greater dielectric strength than any other insulating material. It surpasses all Mica in dielectric strength, thermal endurance, mechanical strength, moisture resistance, transparency, flexibility, resilience, toughness and perfection of cleavage and is therefore recognized as the best Mica for electrical and electronics devices. It is almost insensitive to atmospheric weathering and offers greater resistance to outside chemical influence. Muscovite Mica is harder than Phlogopite Mica. Muscovite Mica is the most commonly used Mica in electrical insulation and since it has the best electrical properties of all Mica. High quality Mica cleaves the easiest and into the thinnest sheets and with the fewest imperfections that could be seen at the atomic or near atomic scale with AFM or TEM instrumentation. Muscovite Mica is commonly divided into two color groups: Ruby: varies in color from clear to pink to red / brown Green: varies in color from pale green to olive to dark green Ruby Muscovite: Color ranges from an almost white through pink to a light ruby and into shades of brownish ruby and brown. Ruby Mica has excellent cleavage capabilities permitting it to be split into the thinnest desired film without the risk of cracking. Green Muscovite: Ranges from light to pale green through yellowish and olive green to a dark green. Color as such has less significant influence on quality. Still ruby Muscovite is generally preferred especially in the higher qualities as it is considered to be superior to green Mica for applications requiring high dielectric strength and low power loss (or high Q). Ruby and green Mica have excellent cleavage permitting it to be split into the thinnest desired film without the risk of cracking. Use of ruby and green Mica is a matter of preference and application. Phlogopite Mica – KMg3(AlSi3O10)(OH)2 – is a hydrous potassium magnesium aluminium silicate. Here the calcination temperature is reached at about 800 C. Generally speaking, Phlogopite Mica is softer than Muscovite Mica and this for instance makes it more suitable for the manufacture of commutator Micanite used in commutators of flush running designs. Phlogopite Mica is commonly called amber Mica and varies in color from light silver to dark brown. Phlogopite Mica has poor electrical properties and chemical resistance in comparsion to Muscovite Mica. Visit our website at to learn more about mica.

Posted at 04:43 am by SadiqGill
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Sep 26, 2016
What Is Mica?

Mica is a naturally occurring mineral, based on a group of silicate minerals composed of varying amounts of aluminum, potassium, magnesium, iron and water having thin sheet-like or plate-like structure with different composition and physical properties.

All Mica form flat six-sided monoclinic crystals with a remarkable cleavage in the direction of large surfaces, which permits them to be easily cleaved into optically flat films. When cleaved into thin films, they remain tough and elastic even at high temperatures.

Mica possesses some of the most outstanding combinations of chemical, physical, electrical, thermal and mechanical properties which cannot found in any other insulating product.

Mica is a biaxial birefringent crystal. Its average refractive index in the visible spectrum is about 1.6. Because of its birefringence, it can be used to cause a phase delay between two orthogonal components of an input linear polarization and thus can be used as a retardation device.

This post was submitted by Axim Mica.

Axim Mica specializes in high temperature Mica products, such as mica sheets, paper, tubes, tapes, washers and custom fabricated mica parts.

Axim Mica is committed to meeting customer requirements, on-time deliveries and continual improvements of products and services manufactured.

Posted at 05:53 am by SadiqGill
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