Aluminium silicate (or aluminum silicate) is a name commonly applied to chemical compounds which are derived from aluminium oxide, Al2O3 and silicon dioxide, SiO2 which may be anhydrous or hydrated, naturally occurring as minerals or synthetic. Their chemical formulae are often expressed as xAl2O3.ySiO2.zH2O. It is known as E number E559.
Aluminum silicate (Al2SiO5) is also known as kaolin, or hydrated aluminum silicate when in powder form. Aluminum silicate is a mixture of alumina, silica, and oxygen.
It is often used as a demulcent and adsorbent in pharmaceutical industry.
It is used in color lakes (insoluble dyes). As a raw material, it is commonly found in paper, plastics, cosmetics, and pharmaceuticals, and it is also used in pharmaceutical preparations as a filtering agent to clarify liquids. As a medicinal agent, it is used to treat diarrhea. In dentistry, used to add toughness and opacity to porcelain teeth. Other common names for hydrated aluminum silicate include heavy or light kaolin, china clay, bolus alba, porcelain clay, white bole, and argilla.