Description

Kaolin, Calcined is a high-purity, thermally treated aluminum silicate clay, widely recognized for its enhanced brightness, opacity, and inertness compared to its hydrous counterpart. This processing step is critical for delivering consistent performance in demanding applications where color, chemical stability, and low moisture content are paramount. It serves as an essential functional filler and extender for industries including paints & coatings, plastics, rubber, adhesives, and pharmaceuticals, providing improved reinforcement and processing characteristics.

Application

• Paints & Coatings: Acts as a high-performance extender pigment, improving opacity, sheen control, and scrub resistance in water- and solvent-based formulations.
• Plastics & Polymers: Used as a functional filler to enhance stiffness, dimensional stability, and surface finish in PVC, polyolefins, and engineering plastics.
• Rubber Industry: Serves as a reinforcing agent in rubber compounds, improving tensile strength, abrasion resistance, and electrical insulation properties.
• Adhesives & Sealants: Imparts viscosity control, improves bonding strength, and reduces material costs in various adhesive systems.
• Pharmaceuticals & Cosmetics: Utilized as an excipient in tablet formulations for its binding and disintegrant properties, and in cosmetics for its absorbency and texture.
• Paper Manufacturing: Enhances brightness, opacity, and printability as a coating and filling pigment for high-quality paper grades.
• Ceramics & Refractories: A key raw material contributing to whiteness, strength, and thermal stability in ceramic bodies and refractory products.

Basic Information

Product Name	Kaolin, Calcined
CAS No.	92704-41-1
Molecular Formula	Al2O3·2SiO2 (Anhydrous Basis)
Molecular Weight	258.16 g/mol (Theoretical)
Synonyms	Calcined China Clay; Anhydrous Aluminum Silicate; Metakaolin; Burnt Clay; Thermo-Optically Treated Kaolin; Aluminum Silicate, Calcined; Paper Clay (Calcined); EINECS 296-473-9
EINECS	296-473-9

Quality Control

Our Kaolin, Calcined is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. Production is monitored against key parameters including brightness, particle size distribution, and residue. A comprehensive Certificate of Analysis (COA) detailing purity, physical properties, and compliance with relevant specifications is provided with each shipment and is available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. This product is hygroscopic (moisture-sensitive); ensure containers are sealed after each use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	White to off-white fine powder
Brightness (GE, %)	≥ 90
Particle Size (Sedigraph, % < 2µm)	80 - 95
Loss on Ignition (LOI, 1000°C)	≤ 1.0 %
pH (10% Slurry)	5.0 - 7.0
Oil Absorption (g/100g)	60 - 90
Residue on 325 Mesh (Wet Sieve, %)	≤ 0.5
Specific Gravity	2.5 - 2.6

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.