Sodium aluminum phosphate

Sodium aluminium phosphate is the acid in most double-acting baking powder, releasing carbon dioxide slowly in the bowl and fully in the oven heat. It is also a major dietary source of aluminium, which regulators track.

Where it is and isn’t permitted

Status of Sodium aluminum phosphate by jurisdiction. Every jurisdiction this site covers is listed, including those where the substance does not appear.
JurisdictionStatusScope and limitsCitation
United StatesFood and Drug AdministrationPermitted21 CFR 182.1781retrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFANot listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.

What it is made from

Produced by reacting phosphoric acid with sodium and aluminium sources.

  • Vegan
  • Vegetarian
InChIKey
GHHVYBBTKTVOPA-UHFFFAOYSA-K
PubChem
CID 3032541

Every name it appears under

12 recorded names. A label may use any of them.

CAS registry number

  • 7785-88-8

As it appears in regulation

  • Sodium aluminum phosphate

Other names

  • ALUMINIUM(3+) ION SODIUM PHOSPHATE
  • Aluminum sodium phosphate
  • GHHVYBBTKTVOPA-UHFFFAOYSA-K
  • HSDB 691
  • Phosphoric acid, aluminium sodium salt
  • Phosphoric acid, aluminum sodium salt
  • Phosphoric acid, aluminum sodium salt (1:?:?)
  • SODIUM ALUMINIUM PHOSPHATE
  • SODIUM ALUMINUM PHOSPHATE
  • Sodium aluminumphosphate

Hazard reference values

No reference value for this substance in the sources we hold.

Evidence and how bodies read it

Studies, and the differing conclusions regulators drew from them, are curated by hand rather than machine-read, and none has been written for this substance yet.

Sources for this page

  • ecfr retrieved 2026-09-07

Full licence terms and publisher details on Sources. How this page is built and updated: Method.

Machine-readable:/api/v1/additives/sodium-aluminum-phosphate.json