Mica sheet is divided into two groups in terms of flexibility:

Rigid or Dry Mica Sheet
Soft Mica Sheet
The thickness of dry mica ranges from 0.10 mm to 50 mm and the thickness of soft mica ranges from 0.10 to 2 mm, making this mica model highly adaptable for various applications and in various settings.

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Soft mica and hard (dry) mica sheets are transparent and opaque, flexible, dielectric, chemically resistant, and lightweight insulators, and are also stable when exposed to electricity, light, moisture, and temperature. These micas are good thermal conductors and are used as electrical insulators in electronic equipment.

Applications of hard and soft mica​​​​​​​

Both types of mica can be used in industries and for different purposes. Some properties are common in both sheets, but in some cases we see different applications for them. We will mention these applications below:

Resistant thermal cables

Soft mica and hard mica insulation are used in fire-resistant heat cables in aluminum plants, blast furnaces, critical wiring circuits (e.g., defense systems, fire alarm and security systems, and surveillance systems), heaters and boilers, wood and metal furnaces. Both products are also high-temperature and can be used in the aluminum, glass, and molten steel industries.

Lighting equipment

Soft mica is widely used as a lampshade material in lighting. When shaped and cut, these micas create warm light with unique and striking colors that result from changes in mineral deposition.

Decorative uses

Other decorative uses of mica include use in fireplaces, wallpaper, and many other decorative functions where mica's unique texture and reflective appearance lend a unique effect.

Fast heat transfer

Soft, dry mica sheets have good resistance to high temperatures and are very thin and light. This high thermal resistance combined with adequate strength ensures the longevity of the product, and its thinness allows for rapid heat transfer and cooling of the heating element.

Like refractory ceramic board, mica in both its forms has low thermal conductivity and good mechanical properties, making it essential for use in supporting heating coils and spirals. Mica also has excellent dielectric properties, good fire resistance, and low smoke emission.

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Different forms of hard mica and their use in furnaces

Dry mica can be cut into various custom shapes and designs and used as a very versatile product. Dry-worked mica shapes include flanges and discs, which can be CNC machined to produce parts in various industries.

Dry mica sheets are also used in furnace construction. These sheets are resistant to heat and provide insulation for the furnace floor and other areas. Mica sheets can protect people from burns and also prevent condensation from accumulating on cold work surfaces in foundries.

For induction furnaces, soft mica sheets have very good thermal resistance and mechanical strength, and for arc furnace processing at very high temperatures, hard mica sheets provide an external insulating material.

Use of hard mica in household appliances

Dry micas are widely used in household appliances and other products that require an electric heating element. These include items such as heaters, space heaters, and hair dryers.

Using soft mica (rolled mica) for winding

Soft mica can act as a coating or an insulating foil. Soft mica sheet is also suitable for winding, and silver and gold mica sheet is also used in microwave ovens. We will talk about muscovite mica sheet at the end of this article.

Soft mica and hard mica sheets in the phlogopite type are thicker and semi-flexible and are used in applications where high-performance thermal and voltage insulation is required (such as the automotive and aerospace industries).

Using hard mica for casting

Soft mica and hard mica are essential for the foundry and steel industry as a reinforcing material. Mica increases the life of the furnace lining, which is very important when processing at high temperatures. Mica also causes the contraction and expansion of furnace linings, reducing the possibility of damage caused by the melting operation. Mica sheet in tundishes gives them the ability to cast continuously.

Sanitary material manufacturing industries

Electrical insulation, rubber and computer, paper and aerospace industries

Refractory materials in electronic components manufacturing industries, aerospace industry, oil and construction industries

Refractory materials in paper industries

Cosmetic uses of mica such as matte, various types of shadows and cosmetic powders, etc.

Health uses such as use in making toothpaste, various types of hygiene powders, etc.

Construction uses such as: various external coatings, cellulose coatings and use as insulation

Industrial uses such as: welding powder, paint, drilling mud for extraction and oil wells and temperature insulation

Accordingly, mica can be divided into two categories: muscovite (silver mica) and phlogopite (golden mica), each of which can be soft mica or hard mica.

Classification of mica in terms of thermal resistance

Muscovite mica (silver mica sheet) with a thermal grade of 500-600 degrees Celsius

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Phlogopite mica (golden mica sheet) with a thermal grade of 800-850 degrees Celsius

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Silver mica and gold mica sheets have found widespread use in industry, commerce, and household goods due to their flexibility and elasticity, impermeability, low thermal and electrical conductivity, and high dielectric strength. In these industries, hard mica and soft mica are used.

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Mica technical specifications

Mika Rowley

Another type of mica is known as roll mica, which is 1 meter wide and comes in rolls. Soft roll mica has good flexibility properties, which makes it very widely used. To strengthen the mechanical properties and prevent the roll mica from tearing, a layer of fiberglass cloth is placed in between.​​​​​​​ In fact, the high-quality type of rolled micas is in 3 layers. Although 3-layer phlogopite (gold) mica is one of the most widely used rolled micas in the market, silver mica sheet is also among the products used in industries.