Kaolin

Kaolin is a fine, white clay mineral composed mainly of kaolinite (Al₂Si₂O₅(OH)₄). It is widely used in pharmaceutical and laboratory applications due to its chemical inertness, fine particle size, and adsorbent properties.

🏭⚗️ Production
Kaolin is obtained from natural deposits through mining, followed by washing to remove impurities like sand and iron oxide. The cleaned material is then dried and ground into a fine powder. In some cases, it is calcined at high temperatures to improve whiteness and purity. The final product is packaged under controlled conditions to maintain its quality for pharmaceutical and laboratory use.

🔬 Properties
Kaolin is chemically inert, non-toxic, and has a very fine particle size, which allows it to act as an effective adsorbent and filler. It has low solubility in water, high thermal stability, and excellent whiteness. Its layered structure contributes to its ability to bind moisture and stabilize formulations, making it suitable for tablets, suspensions, and other pharmaceutical preparations.

🧪 Applications
In pharmaceuticals, kaolin is used as an excipient in tablets, capsules, and powders. It acts as a stabilizer, thickening agent, and adsorbent for toxins or moisture. In laboratory applications, kaolin is employed as an inert filler, as a component in chromatography, and in studies requiring controlled adsorption properties. It is also used in cosmetic formulations for masks and creams due to its gentle absorbent nature.

⚠️ Safety
Kaolin is generally regarded as safe for oral and topical use. Inhalation of fine kaolin dust may cause mild respiratory irritation, so handling should involve proper ventilation and use of protective masks. It should be stored in a dry, cool place to maintain its physical and chemical properties.