Hydrous kaolin

Hydrous kaolins (i.e. kaolins containing 13% water of crystallisation based on mass) were first commonly used as papermaking fillers in the nineteenth century... 

Hydrous kaolins are naturally occurring minerals found as hexagonal plates of varying crystalline uniformity. The plates are often associated with one another as stacks or booklets (Fig. 6.1). These particles have low aspect ratios and typically exhibit small surface area. Aspect ratio is defined by the ratio of the plate diameter to the plate thickness. 

Hydrous kaolins, standard GCC, rhombohedral PCC, talc and titanium dioxide may be considered products that comprise discrete particles. These filler products typically range from plates to spheres to blocks of varying uniformity. 

Talc and hydrous kaolins are naturally platy by nature, and degree of platiness can be enhanced by the delamination process. Oftentimes, these products are differentiated by aspect ratio which is defined as the ratio of plate diameter to plate thickness. Key benefits of shape-engineered platy particles include reduced sheet permeability along with improved smoothness and printability. 

Chem. Descrip). Hydrous kaolin clay Chem. Analysis Moisture (1% max.)... 

Chem. Descrip. Hydrous kaolin clay CAS 1332-58-7 EINECS/ELINCS 296-473-8 Uses Filler for adhesives, paint, plastics, and inks Features Med. brightness, coarse particle size, low oil and water demand functional filler... 

Airfloat clay, the type most used in rubber compounds, is dry-ground hydrous kaolin that has been air-separated to reduce impurities and control particle-size distribution. However, some water-washed clay (slurried in water and centrifuged or hydrocycloned to remove impurities) is used, because it contains a lower level of impurities and gives compounds that are more colorable. The water-washed clay also causes less die wear during extrusion. 

In North America, about 11000 tons of hydrous kaolin was sold for 2.1 million to the plastics industry in 1999 forecast for 2004 was a 2.5% growth in tons per annum to 12 000 tons [11]. Of the calcined kaolin consumed, the use in plastics accounted for... 

Materials LLDPE Dowlex 2553 (Dow), Ti02 Tri-Pure RlOl (Dupont), Ultrex 96 engineered calcined kaolin (BASF Corp.), ASP-170 specialty hydrous kaolin (BASF Corp.). 

China clay or Kaolin (from the Chinese "kao-ling," hill) is a hydrated aluminium silicate crystalline mineral (kaolinite) formed over many millions of years by the hydrothermal decomposition of granite rocks. Hydrous kaolin is characterized by its fine particle size, plate like or lamellar particle shape and chemical inertness. There are many production sites in China and in... 

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