| KAOLIN | ||
|
PRODUCT IDENTIFICATION |
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| CAS NO. |
1335-30-4 (Aluminium
Silicate) 1332-58-7 (Kaolin) |
|
| EINECS NO. | 215-628-2 (Aluminium Silicate) | |
| FORMULA | Al2O3·2SiO2·2H2O | |
| MOL WT. | ||
|
H.S. CODE |
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| TOXICITY | ||
| SYNONYMS | Aluminum Silicate; Silicic acid, aluminum salt; | |
| Aluminosilicic acid; Kieselsäure, Aluminiumsalz (German); ácido silícico, sal de aluminio (Spanish); Acide silicique, sel d'aluminium (French); China clay; Kaolinite; Kaopectate; Porcelain clay; | ||
| DERIVATION | ||
|
CLASSIFICATION |
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GENERAL DESCRIPTION & APPLICATIONS |
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| kaolin is any of a group of fine clay minerals with the chemical composition of Al2O3·2SiO2·2H2O which means two-layer crystal (silicon-oxygen tetrahedral layer joined to alumina octahedral layer) exist alternately. Clay minerals include kaolinite, nacrite, dickite, montmorillonite, illite, chlorite, attapulgite and anauxite. Chemical composiitons of kaolin minerals are same. But each differs from by layers stacked on top of one another. Kaolinite is the principal constituent of kaolin. Its chemical structure is Al2Si2O5(OH)4 (theoretically 39.8% alumina + 46.3% silica + 13.9%) but elements are not diverted from this ideal composition. Kaolinite is a hydrous aluminum silicate prepared by the chemical weathering of feldspar and decomposition of aluminium silicate rocks. It is a soft, earthy and white mineral bur is colored light orange to red by iron oxide. kaolin minerals long have been the basic raw materials used in the ceramic industry, especially in fine porcelains. They can be easily molded, have a fine texture, and are white though fired. Large quantities of them are used also in paper coating, filler, paint, plastics, fiberglass, catalysts, and other specialty applications. They are the main component of blue pigment called ultramarine Blue (sodium aluminosilicate containing sulphur) which is prepared by heating kaolin, sodium carbonate, sulfur and other inexpensive ingredients together. It features heat and alkali resistance. They are used to treat upset stomach medically and as an ingredient pesticide useful to replace organic pesticides. | ||
| SALES SPECIFICATION | ||
| KAOLIN ORE | ||
|
GRAIN SIZE |
59.0 - 61.0% |
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| SPECIFIC GRAVITY |
50mm max |
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| KAOLINITE |
95.0% min |
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HARDNESS |
3 -4 |
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|
LOSS ON IGNITION |
14.5% max |
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|
SPECIFIC GRAVITY |
2.6 |
|
|
pH |
6 - 8 |
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| Al2O3 |
39.0% min |
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| SiO2 |
43.5% min |
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| Fe2O3 |
0.7% max |
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TiO2 |
0.6% max |
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MnO |
0.3% max |
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P2O5 |
0.3% max |
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Na2O |
0.2% max |
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CaO |
0.3% max |
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MgO |
0.3% max |
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K2O |
0.2% max |
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|
SO3 |
0.03% max |
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TRANSPORTATION |
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| PACKING | ||
| HAZARD CLASS | ||
| UN NO. | ||
| OTHER INFORMATION | ||
