Kaolin
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Calcium Carbonate
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Micronized Mica Powder
Mica (Hydrated Potassium Aluminum Silicate)
Mica, known as muscovite glass, is the most common type of mica. Muscovite (hydrated potassium aluminum silicate) derives from the ideal structure of talc and pyrophyllite in environments that had been rich in aluminum, potassium, sodium, or calcium ions, in such a way that aluminum has replaced one-quarter of the tetrahedral silica, and potassium has been added between the layers to maintain electrical neutrality. The bond between the muscovite layers is weaker than its internal bonds, evident in its one-directional cleavage but stronger than that of pyrophyllite, making muscovite feel less greasy. Muscovite forms as a primary igneous mineral in granites and silica-rich rocks and is a major component of many metamorphic rocks and sedimentary schists.
Structure:
It crystallizes in the monoclinic system, often as flat, pseudo-hexagonal crystals. It is scattered as thick sheets in igneous rocks, as streaks in schist and gneiss, and also as clay in sedimentary rocks. It has perfect one-directional cleavage and separates into sheets with rough edges but is elastic and robust. It is colorless, gray, light green, brown, yellow, rose, or purple. Its streak is white. It has a glassy or pearly luster. It varies from opaque to translucent and is transparent when in thin sheets. It has a Mohs hardness of 2 to 3 and a specific gravity of 2.7 to 3.1.
Properties:
Mica sheet with ceramic glue is known as a ceramoplastic insulator. A type is produced with artificial mica flake and glass glue. Heavier sheets with glass glue are also produced for frames and parts of electronic devices. Mica paper and mica mesh, typically produced with an organic adhesive to create flexibility, include one of the oldest mica papers, named Watsonite, which is made of natural mica flake that has been dehydrated by heat and sheeted with resin glue. Many mica papers have excellent insulation resistance, but their thermal resistance is limited by their glue.
Transformer grade mica, used for Class H insulation, may be made with silicone glue. Sheets 0.05 millimeters thick have an insulating resistance of 32 volts per micron and a tensile strength of 7 kilograms per square millimeter. The first artificial mica was made by melting a mixture of 11.6% alumina, 32.6% magnesium oxide, 30.7% cryolite, and 25.1% K2SiF6.
Applications:
Plastics are often filled with mica powder and traded as sheets, pipes, and molded parts, but are distinct from mica ceramics, which are molded with organic glue and usually have superior physical properties.
A mixture of mica with lead borate forms lead borosilicate, which upon casting has good strength and resistance to water and bending, and a low coefficient of expansion. Molded parts have a specific gravity of 3.8, a bending strength of 4.8 kilograms per square millimeter, a Rockwell hardness of 110 M, and a working temperature of 650°C.
The first mica substitute during the war, known as "Glashart Gobain," was made by saturating very fine glass fiber cloth with high alkali with a kaolin osmosis solution in alcohol and a synthetic resin and then compacting it at high heat. It has also been made with bentonite and asbestos fiber wetted with ethyl silicate.
Ultra-fine glass fibers are produced in papermaking machines as sheets 0.15 to 0.3 millimeters thick in continuous coils 96 centimeters wide. They withstand temperatures up to 650°C, with insulation resistance greater than natural mica.
For capacitors and transformers, sheets 0.02 to 0.0425 millimeters thick are made with thin glass fiber and a tetrafluoroethylene resin glue, which is stiffer and stronger than ordinary thin plastic layers, with an insulation resistance of 160 volts per micron and a working temperature of 250°C.
Glass paper is made from borosilicate glass flake and an alkyd, phenolic, or silicone resin glue. Where there is no excessive heat, various thin plastic layers are used for insulating grooves.
The use of mica powder in the production of cosmetics
Application of mica powder in rubber making
The use of mica powder in the production of glue
Application of mica powder in coloring
Buy Mica Powder from a trusted supplier to improve the performance, durability, and quality of your industrial products. Mica powder is a high-value industrial mineral recognized for its unique layered structure, excellent electrical insulation, outstanding thermal resistance, and exceptional chemical stability. As a result, it has become an essential raw material in industries such as electronics, refractory materials, construction, plastics, paints, coatings, and composites.
Choosing the right mica powder is more than a routine purchasing decision—it is an investment in product quality and manufacturing efficiency. By understanding its physical properties, available grades, and industrial applications, manufacturers can select the most suitable mica for their specific production requirements. In this guide, we explore the characteristics, technical advantages, major applications, and key purchasing considerations of mica powder to help businesses make informed decisions.
Structure and Physical Properties of Mica
Mica is a group of naturally occurring silicate minerals distinguished by their unique layered, sheet-like crystal structure. This characteristic structure allows mica to split easily into extremely thin sheets while maintaining remarkable flexibility, mechanical strength, and dimensional stability. Most mica minerals crystallize in the monoclinic crystal system, although they often exhibit pseudo-hexagonal crystal forms.
Thanks to this distinctive crystal structure, mica can be cleaved into thin, flexible sheets without losing its structural integrity. Consequently, it has become one of the most valuable industrial minerals for applications requiring both flexibility and durability.
Mica occurs in a wide range of colors, including colorless, gray, light green, brown, yellow, purple, and violet, while its streak is typically white. In addition, it exhibits a vitreous to pearly luster and may appear transparent, translucent, or opaque depending on its composition and particle size. These optical characteristics are particularly important when selecting mica powder for decorative, cosmetic, or industrial applications.
Another defining feature of mica is its perfect basal cleavage, which enables it to separate into extremely thin layers with ease. The mineral has a Mohs hardness of approximately 2 to 3 and a specific gravity ranging from 2.7 to 3.1 g/cm³. Furthermore, its outstanding thermal resistance, excellent electrical insulation, and chemical stability make mica an ideal material for demanding technical and industrial applications.
When choosing to buy mica powder, understanding these physical characteristics is essential. Properties such as particle morphology, color, density, hardness, and exfoliation capability have a direct impact on processing efficiency and the performance of the final product across various industrial applications.
Insulating and Industrial Properties of Mica
One of the most remarkable characteristics of mica is its exceptional electrical and thermal insulation. Because of these outstanding properties, mica has become a strategic material for electrical equipment, electronic components, and high-temperature industrial applications. Its layered crystal structure, combined with the presence of silicate compounds containing potassium, aluminum, magnesium, or iron ions, provides excellent dielectric strength and the ability to withstand temperatures of up to 650°C (1,202°F). As a result, mica is commonly classified as a Class H electrical insulation material for high-temperature applications.
Electrical and Electronic Applications
In the electrical and electronics industries, mica sheets and mica paper are widely used as insulating materials in transformers, capacitors, generators, electric motors, and other high-voltage equipment. For example, ultra-thin mica insulation products with thicknesses ranging from 0.02 to 0.05 mm can provide dielectric strengths of up to 160 volts per micron, making them ideal for precision electrical and electronic applications.
Industrial Applications
Beyond the electrical sector, mica powder is widely used as a functional filler in plastics, engineering ceramics, heat-resistant industrial paints, fire-resistant coatings, molded components, and composite materials. Unlike many conventional mineral fillers, mica retains its characteristic plate-like particle structure even after grinding. Consequently, it improves the mechanical strength, dimensional stability, thermal resistance, and flexibility of finished products.
Mica-Based Insulation Materials
Mica is also an essential component in the manufacture of mica insulation paper, which is combined with various binders such as silicone resins, phenolic resins, and polytetrafluoroethylene (PTFE). These advanced insulation materials are specifically designed for demanding industrial environments that require high thermal resistance, electrical safety, and long-term reliability.
Furthermore, when natural mica cannot fully satisfy specific engineering requirements, manufacturers develop advanced synthetic insulation materials by combining fiberglass, specialized resins, and other engineered compounds to replicate or enhance the insulating performance of natural mica.
When you buy mica powder, evaluating its electrical insulation, thermal stability, and particle quality is essential. These properties determine whether the material is suitable for demanding electrical, thermal, structural, or industrial applications, ensuring reliable performance in the final product.
Types of Mica Powder
Mica powder is available in several types, classified according to the mineral species, processing method, and intended industrial application. Understanding these different grades is essential when you buy mica powder, as each type offers unique properties suited to specific manufacturing processes.
Muscovite Mica
Muscovite is the most common naturally occurring mica mineral. It is typically colorless, light gray, or pale green and is highly valued for its excellent insulating properties.
Key Features:
Outstanding electrical insulation
Excellent thermal resistance
Vitreous to pearly luster
Typical Applications:
Electrical insulation, paints and coatings, cosmetics, plastics, and composite materials.
Phlogopite Mica
Phlogopite is a brown to golden-brown mica that offers superior heat resistance compared to muscovite. Consequently, it is widely used in applications exposed to elevated temperatures.
Key Features:
Excellent thermal stability
High mechanical strength
Reliable performance in high-temperature environments
Typical Applications:
Foundry operations, automotive components, thermal insulation systems, and high-temperature industrial equipment.
Biotite Mica
Biotite is a dark-colored mica, usually black or dark brown, with a relatively high iron content. Although its electrical insulating properties are lower than those of muscovite or phlogopite, it remains valuable for several industrial applications.
Typical Applications:
Construction materials, concrete reinforcement, and selected mineral additives.
Synthetic Mica
Unlike natural mica, synthetic mica is manufactured under controlled laboratory or industrial conditions. As a result, it offers exceptional purity, consistent quality, and highly predictable electrical and thermal performance.
Key Features:
Free from natural impurities
Uniform physical and chemical properties
Excellent dielectric and thermal performance
Typical Applications:
Advanced capacitors, aerospace components, defense technologies, and high-performance electronic equipment.
Flake Mica
Flake mica is produced by mechanically crushing larger mica sheets and then classifying the particles into various size ranges.
Typical Applications:
Paints and coatings, plastics, cosmetics, resins, and decorative finishes.
Fine-Ground Mica
Fine-ground mica is an ultra-fine powder produced by carefully milling flake mica or muscovite using specialized grinding equipment. Because of its fine particle size, it disperses easily within many industrial formulations.
Typical Applications:
Anti-corrosion coatings, rubber compounds, liquid insulation systems, engineering polymers, and advanced composite materials.
Sheet Mica
Sheet mica consists of naturally occurring thin mica sheets primarily used for electrical insulation. Furthermore, these sheets may be processed into mica powder when specific particle sizes or industrial formulations require it.
Typical Applications:
Electrical insulation materials, electrical equipment, electronic components, and specialty industrial applications.
Applications of Mica Powder
Thanks to its exceptional thermal resistance, electrical insulation, plate-like particle structure, and chemical stability, mica powder is used across a wide range of industries. As a result, it has become one of the most versatile industrial minerals for improving product performance, durability, and reliability.
Electrical and Electronics Industry
Because of its outstanding dielectric properties, mica powder is a key raw material for manufacturing mica sheets, mica paper, and electrical insulation components. These products are widely used in transformers, capacitors, electric motors, generators, and other high-voltage equipment. Furthermore, mica provides reliable insulation in applications exposed to elevated temperatures and demanding operating conditions.
Plastics and Polymer Industry
In engineering plastics, mica powder serves as a high-performance functional filler. Its plate-like particle structure improves mechanical strength, enhances thermal stability, and minimizes shrinkage in molded parts. In addition, it increases resistance to creep, cracking, and dimensional deformation, resulting in longer-lasting plastic components.
Paints and Coatings Industry
Mica powder is widely incorporated into decorative paints, anti-corrosion coatings, and heat-resistant finishes because of its excellent light-reflecting properties. Moreover, it improves coating adhesion, weather resistance, durability, and protection against ultraviolet (UV) radiation, making it suitable for demanding industrial environments.
Construction Materials
The construction industry uses mica powder in cement-based materials, gypsum products, architectural coatings, and other building materials. Consequently, it enhances thermal insulation, sound insulation, and fire resistance. It is also used in fire-resistant boards and protective coatings designed for structural applications.
Automotive Industry
In automotive manufacturing, mica powder is incorporated into interior components and engineering plastics that require excellent electrical or thermal insulation. Additionally, it is used in heat-resistant coatings and protective materials surrounding engines, exhaust systems, and other high-temperature automotive parts.
Cosmetics and Personal Care
Highly purified, ultra-fine mica powder is widely used in cosmetics and personal care products, including eye shadows, face powders, foundations, and nail polishes. Its natural pearlescent effect gives these products an attractive shimmer while enhancing their visual appearance and finish.
Household Appliances and Textile Industry
Mica powder is also used in selected plastic components for household appliances and in heat-resistant textile fibers. As a result, it improves thermal durability and helps protect materials from heat-induced degradation during long-term use.
Buy Mica Powder
If you are looking to buy mica powder with consistent quality and reliable performance, MPSM Industrial & Mining Group is your trusted partner. We supply premium-grade mica powder for a wide range of industries, including plastics, electronics, construction, paints and coatings, automotive manufacturing, and other industrial applications.
With advanced processing technology, strict quality control, and expert technical support, we help our customers select the most suitable mica powder for their specific production requirements.
Contact MPSM Industrial & Mining Group today to discuss your project and receive professional guidance on choosing the right mica powder for your application.