Characteristics Of Mica Powder

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Mica powder belongs to the monoclinic crystal system; its crystals are flaky in form and possess a silky luster (though muscovite exhibits a vitreous luster). In its pure block form, it appears in shades of gray, rose-purple, white, and other colors. It features a diameter-to-thickness ratio of >80, a specific gravity of 2.6–2.7, and a hardness of 2–3 on the Mohs scale.

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It is highly elastic and flexible, and demonstrates excellent abrasion resistance and durability. Furthermore, it is heat-resistant and electrically insulating; it is insoluble in acidic and alkaline solutions and exhibits stable chemical properties. Test data indicates the following: an elastic modulus of 1505–2134 MPa, a thermal resistance of 500–600°C, a thermal conductivity of 0.419–0.670 W/(m·K), an electrical insulation strength of 200 kV/mm, and a radiation resistance of 5 × 10¹⁴ thermal neutrons/cm².

Additionally, the chemical composition, crystal structure, and texture of mica powder are similar to those of kaolin. It also shares certain characteristics with clay minerals-specifically, excellent dispersibility and suspension stability in aqueous media and organic solvents, a fine particle size, a white color, and inherent plasticity. Consequently, mica powder uniquely combines a diverse array of characteristics derived from both mica-group minerals and clay-group minerals.