Description

Kaolin CAS NO 52624-41-6 is a naturally occurring, hydrated aluminum silicate clay mineral renowned for its fine particle size, chemical inertness, and excellent whiteness. Its unique properties make it an indispensable functional filler and processing aid across numerous industries. This versatile material is essential for manufacturers in sectors such as paper, ceramics, paints & coatings, rubber, plastics, and pharmaceuticals, where it enhances product performance, appearance, and processability.

Application

• Paper Manufacturing: Used as a filler and coating pigment to improve paper brightness, opacity, smoothness, and printability.
• Ceramics & Refractories: A primary raw material in the production of porcelain, sanitaryware, and tiles, providing plasticity, strength, and whiteness to the finished product.
• Paints & Coatings: Acts as an extender pigment to improve suspension, sheen control, film integrity, and scrub resistance.
• Rubber & Plastics: Functions as a reinforcing filler to enhance tensile strength, abrasion resistance, and dimensional stability.
• Pharmaceuticals & Cosmetics: Utilized as an adsorbent, diluent, and opacifying agent in tablets, powders, and topical preparations.
• Adhesives & Sealants: Improves viscosity, rheology, and bonding properties.
• Agriculture: Employed as a carrier for pesticides and fertilizers and as a soil conditioner.
• Fiberglass: Serves as a component in fiberglass formulations to improve durability and chemical resistance.

Basic Information

Product Name	Kaolin
CAS No.	52624-41-6
Molecular Formula	Al2Si2O5(OH)4 or Al2O3·2SiO2·2H2O
Molecular Weight	258.16 g/mol
Synonyms	China Clay; Hydrated Aluminum Silicate; Porcelain Clay; White Clay; Bolus Alba; Argilla; Aluminum Silicate Hydrate; E559
EINECS	308-081-0

Quality Control

Our Kaolin is produced and tested under a stringent quality management system to ensure batch-to-batch consistency and compliance with relevant industry standards, including USP/NF, FCC, and ISO. Each lot undergoes comprehensive analysis for key parameters such as chemical composition, particle size distribution, brightness, and viscosity. A Certificate of Analysis (COA) documenting these results is provided with every shipment to guarantee product integrity and support your quality assurance protocols.

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. Kaolin is hygroscopic (moisture-sensitive); ensure containers are sealed after use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	White to yellowish-white fine powder
Identification (IR)	Conforms
Assay (as Al2O3)	36.0 - 39.5 %
Loss on Drying (105°C)	≤ 1.5 %
Loss on Ignition (1000°C)	≤ 15.0 %
pH (10% slurry)	4.0 - 7.5
Particle Size (< 2 μm)	40 - 90 %
Brightness (GE)	≥ 80 %
Heavy Metals (as Pb)	≤ 20 ppm
Microbial Limits	Meets USP <61> & <62>

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