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Sodium aluminosilicate is an acid salt comprising sodium, aluminium, silicon and oxygen. These include synthetic amorphous sodium aluminosilicate, a few naturally occurring minerals and synthetic zeolites. Synthetic amorphous sodium aluminosilicate is widely used as a food additive, E-554.
The FDA has as of April 1, 2012 approved sodium aluminosilicate (sodium silicoaluminate) for direct contact with consumable items under 21 CFR 182.2727. Sodium aluminosilicate is used as molecular sieve in medicinal containers to keep contents dry and as food additive having E-number E-554 (anti-caking agents).
Amorphous sodium aluminosilicate
This substance is produced with a wide range of compositions and has many different applications. It is encountered as an additive E-554 in food where it acts as an anticaking (free flow) agent. As it is manufactured with a range of compositions (see  and so is not strictly a chemical compound with a fixed stoichiometry, one supplier ( ) quotes a typical analysis for one of their products as 14SiO2·Al2O3·Na2O·3H2O,(Na2Al2Si14 O32·3H2O).
Sodium aluminosilicate may also be listed as:
- aluminium sodium salt
- sodium silicoaluminate
- aluminosilicic acid, sodium salt
- sodium aluminium silicate
- aluminum sodium silicate
- sodium silico aluminate
Synthetic zeolites have complex structures and examples (with structural formulae) are:
- Na12Al12Si12O48·27H2O, zeolite A (Linde type A sodium form, NaA), used in laundry detergents
- Na16Al16Si32O96·16H2O, Analcime, IUPAC code ANA
- Na12Al12Si12O48·q H2O, Losod
- Na384Al384Si384O1536·518H2O, Linde type N
- "Sec. 182.2727 Sodium aluminosilicate.". U.S. Food and Drug Administration. 1 April 2012. Retrieved 10 December 2012.
- Alan Dyer, (1994),Encyclopedia of Inorganic Chemistry, ed R. Bruce King, John Wiley & Sons, ISBN 0-471-93620-0
- "Formation and Properties of Losod, a New Sodium Zeolite", Werner Sieber, Walter M. Meie Helvetica Chimica Acta, Volume 57 Issue 6, pp. 1533–1549, 10.1002/hlca.19740570608