1. Product Definition & Process

Calcined Kaolin 1250 Mesh is a high-end derivative product obtained from natural kaolin through a series of deep-processing steps. The production process primarily includes: raw ore beneficiation and purification, drying, superfine grinding to the target particle size, calcination in specific high-temperature kilns (removing crystalline water and organic impurities, achieving phase transformation), and finally precise classification to ensure a concentrated and stable particle size distribution. The calcination process is key to enhancing the product’s performance, transforming it from hydrophilic to organophilic, making it more suitable for polymer matrix applications.

2. Core Physical & Chemical Characteristics

• Fineness & Particle Size Distribution: 1250 Mesh (approx. 10.5 μm), with adjustable and uniform particle size distribution.

• Whiteness & Brightness: Extremely high whiteness post-calcination (typically ≥92%, up to 95%+), high L* value, providing excellent hiding power and bright color for finished products.

• Oil Absorption: Relatively low , meaning less resin or binder is required in formulations, helping to reduce system viscosity or cost.

• Electrical Insulation: Excellent, with high volume resistivity.

• Moisture Content: Very low (<0.5%), ensuring stable storage.

3. Key Performance Advantages

• Optical Enhancement: High whiteness and scattering power provide superior hiding power, opacity, and potential for partial replacement of titanium dioxide in coatings and paper.

• Property Improvement: In plastics and rubber, it enhances tensile strength, modulus, dimensional stability, surface smoothness, and abrasion resistance of products.

• Processing Optimization: Low oil absorption helps improve system rheology, allows higher loading without significantly increasing viscosity, and boosts processing efficiency.

• Durability & Stability: Excellent weatherability, chemical resistance, and thermal stability, contributing to longer product service life.

• Functionalization: Good insulation properties suit applications in wire and cable materials; in adhesives and sealants, it can adjust rheology and enhance cohesive strength.

4. Primary Application Fields

• Coatings Industry: Used in high-grade interior/exterior latex paints, industrial coatings, powder coatings, marine paints, etc., as a functional filler to improve film properties.

• Plastics Industry: Suitable for PVC cable compounds, PP, PE, PA, engineering plastics, etc., as a reinforcing filler to enhance mechanical properties and surface gloss.

• Rubber Industry: Used in shoe soles, tires, seals, hoses, etc., partially replacing silica as a reinforcing and whitening agent.

• Paper Industry: Used as a coating pigment to improve paper whiteness, smoothness, gloss, and printability.

• Adhesives & Sealants: Serves as an extender filler to control flow, increase solids content, reduce costs, and enhance performance.

• Advanced Ceramics & Refractories: Used as a raw material component providing alumina-silica content.

5. Usage Recommendations

• Loading Level: Depending on the specific application system and performance requirements, typical loading ranges from 5% to 40%. Optimal ratio should be determined through testing.

• Dispersion: The use of appropriate dispersion equipment (e.g., high-speed mixers, sand mills) and wetting/dispersing agents is recommended to ensure full dispersion within the system for optimal performance.

• Packaging & Storage: Typically packaged in laminated woven bags or paper-plastic composite bags, commonly in 25kg/bag or 500kg/bag sizes. Store in a cool, dry, and well-ventilated warehouse to prevent moisture.

Note: The above description provides a general overview of characteristics. For specific application requirements, it is advised to request a detailed Technical Data Sheet (TDS) and conduct targeted trials.