Sericite is derived from decomposed granite and has a natural oily layer that gives it a smooth, silky texture. It acts as a lubricant in the rubber and plastic industries during the extrusion process. In cosmetics, its reflective and refractive properties, along with its smoothness, make it an important ingredient.

Chemical Structure & Composition

Sericite is a fine-grained, mica-like mineral, mainly composed of muscovite or illite. Chemically, it is a potassium aluminum silicate:

• General formula: KAl₂(AlSi₃O₁₀)(OH)₂
• It belongs to the phyllosilicate group, like mica, with a layered or platy structure.

What differentiates sericite from standard mica is its ultra-fine particle size, silky texture, and higher purity.

Key Properties

• Ultra-fine particle size – often sub-10 microns (D50)
• Silky, smooth texture – low friction
• Lamellar (platy) morphology – high aspect ratio
• Chemically inert – excellent stability in acidic and basic environment
• Thermal stability – up to 800–900°C
• High whiteness and brightness
• Non-toxic, non-hazardous
• Soft, non-abrasive
• UV and weather resistant
• Excellent dispersibility

Industrial Applications

Functional Benefits

• Soft touch – Ideal for skin-contact applications
• Excellent adhesion – in coatings and cosmetics
• Improves barrier properties – against water, gas, and UV
• Enhances processing flow – in plastic and rubber production
• Boosts durability – in paints, coatings, and composites
• Reduces gloss or adds matte effect – depending on grade and particle size