Powdered soapstone

Talc. Talc (qv) [14807-96-6] (Cl Pigment White 26, Cl No. 77019), is finely powdered, native, hydrous magnesium sihcate, 3MgO 4Si02 H20 (soapstone) sometimes containing a small amount of aluminum siUcate. It is produced ia many parts of the world, including France, Italy, India, and the United States. 

Talc and Soapstone Generally these are easily pulverized. Certain fibrous and foliated talcs may offer greater resistance to reduc tion to impalpable powder, but these are no longer produced because of their asbestos content. 

Talk-pulver, n. talcum powder, -schiefer, m. talc schist, talcose slate, slaty talc. >spat, m. magnesite, -stein, m. soapstone, steatite. Talkum, n. talc, talcum. 

Any substance used to prevent rubber sticking to itself or to the surface of a mould. The lubricant may be a dry powder such as soapstone or a liquid such as silicone emulsion. See Dusting Agent and Mould Release Agent. 

Soapstone - A soft powder or stone, basically hydrated magnesium silicate, having a soapy feel, used to dust the surface of un-vulcanized rubber compounds to keep them from sticking together. Similar to talc. 

Hydrated magnesium silicate (Talc, 3Mg0 4Si02 H20, CAS No. 14807-96-6) is a magnesium silicate commonly referred to as "soapstone". It is obtained from natural sources and may contain a small amount of aluminum silicate. It is composed of MgO (31.7%), Si02 (63.5%), and H2O (4.8%). It is a crystalline nonhygroscopic, odorless, tasteless powder which is practically insoluble in water, dilute mineral acids, dilute solutions of alkali halides, and alkaline hydroxides but is soluble in hot concentrated sulfuric acid. 

Altaic-, E553b hydrous magnesium calcium silicate hydrous magnesium silicate Luzenac Pharma magnesium hydrogen metasilicate Magsil Osmanthus Magsil Star powdered talc purified Erench chalk Purtalc soapstone steatite Superiore. 

Talc is the magnesium silicate structural analog to pyrophyllite. Its properties are nearly identical to pyrophyllite, except that Al3+ cations have been replaced by Mg2+ cations [25], Talc occurs in secondary deposits and is formed by the weathering of magnesium silicate minerals such as olivine and pyroxene [2], In bulk form, talc is also called soapstone and steatite. A typical composition for talc is given in Table 7 [22], Historically, talc has been used extensively in electrical insulator applications, in paints, and as talcum powder [2],... 

Talc, Talcum French chalk. The lumps are also known as soapstone or steatite. Finely powdered native hydrous maguesium silicate. 

Clays are a very important group of inorganic compounds due to their many possible practical applications, such as supports for catalysts, as lubricants, and for thermal insulation. Many clays such as vermicuHte, montmorUlonite, and steatite exhibit a lamellar nanostructure, which make them suitable hosts for the preparation of intercalation compoimds. As recently [1] demonstrated for soapstone, a compact form of steatite (talcum powder), even very small variations in chemical composition can exert significant effects on physical and chemical properties. 

The name soapstone comes from the fact that the stone is very soft. From a formal point of view, soapstone is a compact form of talcum powder (steatite), the fundamental chemical formula of which is Mg3Si40i6(0H)2. This basic silicate is the softest one on the scale ofMohs. Nowadays, soapstone is used to produce artistic artifacts such as statues as well as utensils such as pottery (Fig. 8.7). Care must be taken in its manipulation, due to its possible inhalation toxicity [3]. 

To perform the desired investigations, two soapstone samples were used, both from Ouro Preto city, Minas Gerais State, Brazil. From a macroscopic point of view, the only difference between the two samples is their color one is light gray (the stone itself, since the powder is white) whereas the other is red-brown. The two samples will be denoted hereafter as SS 1 and SS 2, respectively [4]. 

A mineral that has caught the attention of environmentalists and conservationists is talc. Talc is used in the production of paper and tiles, and as coatings in the motor industry for dashboards and fenders (bumpers). However, its main use is in beauty products such as eye shadow, lipstick, body lotions, deodorants, and soaps. Talc is produced from soapstone, which occurs in the form of large subsurface boulders. The concern is that some of the finest powder is obtained from soapstone that is the result of... 

Mr. Bichford introduces powdered French chalk (stea tite, or soapstone) into soap, employing from 4 to about 7 per cent., according to the purpose for which the soap is to be used. For a nursery soap, 4 per cent, is recommended, and for todet soaps 5 per cent, of the powder. 

Grinding. As a final production step, some nitrile rubbers are ground to a particulate form. The larger surface area of these products makes them more readily soluble and, as such, often desirable in cement applications. To prevent reagglomeration of these products an anti-cake or dust must be added. Soapstone, talc, resins, powdered polymers, or other materials are used for this purpose and may ultimately affect the performance of the adhesive. 

---