Kaolin, soft clay

Within industry and commerce, terms other than the mineral classifications are common. Ball clay is a type of kaolin particularly suited to the manufacture of ceramics in 2004, 35% of the ball clay produced in the US was used for tile manufacture, 26% for sanitary ware, 22% for pottery and various ceramics, 11 % for other uses, and the remainder was exported. Kaolinite (which is white and soft) is of great importance in the paper industry for coatings and as a filler of the 7.8 Mt produced in the US in 2004,38% was consumed in paper manufacture within the US and 26% was exported for the same end-use. Worldwide, 44.4 Mt of kaolin-type clays were produced in 2004, the major producers being the US, Uzbekistan and the Czech Republic. 

Soft clay - In the mbber industry soft el is eoarser, better crystallized kaolin. It has low reinforcing effect in mbber, where it provides lower modulus, tensile strength, and abrasion resistanee and softer uncnred compounds than does hard clay. 

Flake Mica. Flake mica is mined from weathered and hard rock pegmatites, granodiorite, and schist and gneiss by conventional open-pit methods. In soft, residual material, dozers, shovels, scrapers, and front-end loaders are used to mine the ore. Often kaolin, quartz, and feldspar are recovered along with the mica (see also Clays Silicon compounds). 

Tests were conducted on soft and hard kaolin clays from Georgia, USA. Soft kaolins are relatively coarse-grained (coarser than 65% < 2 microns), found in Cretaceous age strata, and typically have low Ti02 contents (1-3%). The hard kaolins are fine-grained (finer than 80% < 2 microns), found in Eocene age strata and have higher Ti02 contents (2-8%). 

If the feldspar and quartz content is increased over that in hard porcelain, soft porcelain is obtained which is fired at 100 to 150°C lower temperatures. Highly plastic clay (ball clay) is added to obtain plastic and easy to work pastes, despite the lower kaolin content. Sanitary porcelains for the manufacture of bathroom articles are soft porcelain articles. 

Names kaolin - classified, beneficiated, calcinated, aluminum silicate, calcinated silicate, china clay, soft kaolin, hydrated aluminum silicate, kaolinite... 

China Clay Lion - soft kaolin for use in cosmetics, pharmaceuticals, rubber, paint, paper Calcinated Kaolin Clay - high brightness Plus White Kaolin - paper industry grade Electros Kaolin USP - pharmaceutical and cosmetics grade Kaolin SIM 90 - exceptional brightness without bleaching D.J. Enterprises, Inc., Cleveland, OH, USA Sillum 200 QP... 

Major components of the pressed powder blusher include the powder phase and binder (or oil) phase. Components of the powder phase include mineral powder fillers such as talc (a magnesium silicate), mica (a magnesium ahuninum silicate), sericite (a form of hydrated mica), and kaolin (known as China clay). Talc is the most popular of all fillers used, as it tends to be virtually transparent depending on the particle size, and it is very soft to the touch. Although mica is also used extensively as a result of its transparency and smooth texture, it often exhibits a shiny appearance with skin application and has poor compression characteristics when used in a pressed powder. Modern non-oil control formulations rarely contain kaolin, as it tends to exhibit course texture, an extremely matte appearance, and excessive oil-absorption capabilities. Dry binders are also used to allow tlie compressed powder to retain form these include metallic soaps such as zinc stearate and magnesium stearate and... 

Langford Clay. [R.T. Vanderbilt] Soft kaolin inert filler for elastomers, nonblack stocks. 

Definition Nonplastic variety of kaolin containing an aluminum magnesium silicate Properties Gray to yel. color soft opaque clay greasy feel high absorptive power noncombustible... 

---