Kaolin Powder, also known as China clay, is a high-value hydrated aluminum silicate mineral material. It features excellent plasticity, bonding strength, fire resistance, high whiteness and electrical insulation. Processed through ore washing, purification, wet grinding, drying and high-temperature calcination, kaolin powder owns stable physical and chemical properties. It is widely used in high-end ceramics, paper coating, architectural coatings, rubber plastics and cosmetic industries, becoming one of the most essential functional mineral powders in fine industrial manufacturing.
I. Product Classification and Core Characteristics
1. Washed Hydrous Kaolin
Raw Material: High-purity natural kaolin ore with low iron and low impurity
Process: Water washing, impurity removal, filtering, drying and fine crushing (physical purification)
Appearance: Delicate white powder with good plasticity and suspension
Core Parameters
Kaolinite Content: ≥92%–95%
Whiteness: 88%–93%
Particle Size: 600–4000 Mesh
Moisture: ≤0.3%
Plasticity Index: ≥15
Advantages: Excellent water suspension, fine ink absorption, strong bonding force and good construction performance.
2. Calcined Kaolin
Process: High-temperature calcination at 900–1200℃ after wet purification
Characteristics: Dehydrated and porcelainized structure, higher whiteness, stronger covering power and insulation performance
Advantages: Ultra-low water absorption, high weather resistance, excellent anti-aging performance for outdoor coatings and plastic products
3. Metakaolin (High-Activity Kaolin)
Process: Professional low-temperature activation calcination technology
Characteristics: Strong pozzolanic activity, high chemical reactivity
Advantages: Significantly improve concrete strength, impermeability and crack resistance, widely used in high-performance building materials
4. Surface Modified Kaolin
Process: Organic surface coating treatment
Characteristics: Greatly improved compatibility with polymers, uniform dispersion in plastics and rubber
Advantages: Improve product toughness, wear resistance and surface smoothness
II. Main Application Fields
1. Ceramic Industry (Core Application)
The key raw material for daily ceramics, architectural ceramics, sanitary ware and art ceramics. It improves ceramic body plasticity, molding performance and firing stability, enhances product density, gloss and mechanical strength, reducing firing temperature and defective rate.
2. Paper Making Industry
Washed kaolin is used for paper filling; calcined kaolin is used for high-grade paper coating. It improves paper smoothness, gloss, opacity and ink absorption, making printed patterns clearer and more delicate, widely used in coated paper, art paper and cultural paper.
3. Coatings & Paints
Used as matting filler, anti-settling agent and weather-resistant filler for water-based and oil-based coatings. It improves coating suspension stability, scrub resistance, UV resistance and hiding power, optimizing coating texture and durability.
4. Plastic & Rubber Industry
Improves the rigidity, dimensional stability, aging resistance and electrical insulation of plastic and rubber products, suitable for cable insulation materials, automotive accessories and daily rubber products.
5. Construction & Engineering Materials
Metakaolin is widely used in high-performance concrete, cement mortar and waterproof materials to enhance structural durability, salt resistance and anti-corrosion performance.
6. Cosmetics & Daily Chemicals
Superfine purified kaolin is applied in facial masks, cleansing powder and skin care products, featuring mild oil absorption, delicate texture and skin-friendly performance.
III. Core Product Advantages
Excellent Plasticity & Bonding Property: Unique molding advantages unavailable in calcium carbonate and talc powder
Superior Fire Resistance & Insulation: High refractoriness and stable electrical insulation performance
Strong Weather & UV Resistance: Not easy to age or discolor for long-term outdoor use
Eco-Friendly & Safe: Natural mineral source, low heavy metal, non-toxic and harmless
Stable Batch Quality: Strict purification and calcination process ensure consistent indexes
Full Certification Support: Meet ISO, SGS, REACH and cosmetic-grade safety standards
IV. Professional Selection Guide
Ceramic and paper coating industries: Washed kaolin powder
Outdoor coatings, plastics and insulation materials: Calcined kaolin powder
High-performance concrete and engineering materials: Active metakaolin
Polymer modification: Surface modified kaolin
Cosmetic and high-end daily chemical products: Ultra-fine purified kaolin
