Aluminum potassium sulfate

E number E522CAS 10043-67-1

Aluminium potassium sulfate, a form of alum, is a firming agent used in pickles and a component of some baking powders.

Where it is and isn’t permitted

Status of Aluminum potassium sulfate 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 182.1129retrieved 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

Crystallised from aluminium sulfate and potassium sulfate together.

  • Vegan
  • Vegetarian
CAS registry number
10043-67-1
InChIKey
GRLPQNLYRHEGIJ-UHFFFAOYSA-J
PubChem
CID 24856

Every name it appears under

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

E number

  • E522

CAS registry number

  • 10043-67-1
  • 15007-61-1
  • 7784-24-9

As it appears in regulation

  • Aluminum potassium sulfate

Other names

  • 09OXB01F3O
  • Alaun
  • AlK(SO4)2
  • Alum potassium
  • Alum, N.F.
  • Alum, potassium anhydrous
  • Alumen
  • Aluminium potassium bis(sulphate)
  • Aluminium potassium sulfate
  • aluminium potassium sulfate (1/1/2)
  • ALUMINIUM POTASSIUM SULFATE (1:1:2)
  • Aluminium potassium sulfate, anhydrous
  • Aluminium potassium sulphate
  • Aluminium potassium sulphate anhydrous
  • ALUMINIUM POTASSIUM-SULFATE DODECAHYDRATE
  • aluminium(3+) ion potassium disulfate
  • Aluminum potassium alum
  • Aluminum potassium disulfate
  • Aluminum potassium sulfate
  • ALUMINUM POTASSIUM SULFATE (1:1:2)
  • Aluminum Potassium Sulfate (1:1:2) Dodecahydrate
  • Aluminum potassium sulfate (AlK(SO4)2)
  • Aluminum potassium sulfate (KAl(SO4)2)
  • Aluminum potassium sulfate, alum
  • Aluminum potassium sulfate, anhydrous
  • Aluminum potassium sulfate, puriss., anhydrous, calcined, >=98% (calc with ref. to anhyd. subst.), powder
  • ALUMINUM POTASSIUM SULPHATE
  • ALUMINUM POTASSIUM SULPHATE (1:1:2)
  • ALUMINUM POTASSIUM SULPHATE ANHYDROUS
  • ALUMINUMPOTASSIUMSULFATE
  • Bestmade Natural Products Alum (Kali Alum Sulph)
  • CCRIS 6842
  • Dialuminum dipotassium sulfate
  • E 522
  • Exsiccated alum
  • HSDB 2685
  • INS NO.522
  • INS-522
  • Kalinite
  • NHS CONSTIPATION
  • Potash alum
  • POTASH-ALUM
  • Potassium alum
  • Potassium alum anhydrous
  • Potassium Aluminium Sulfate
  • Potassium aluminum alum
  • potassium aluminum disulfate
  • Potassium aluminum sulfate
  • Potassium aluminum sulfate (1:1:2)
  • POTASSIUM-ALUM
  • POTASSIUM-ALUM-
  • Rxhomeo Homeopathic Combo
  • Sulfuric acid, aluminium potassium salt (2:1:1)
  • Tai-Ace K 150
  • Tai-Ace K 20

Systematic names

  • aluminum;potassium;disulfate
  • aluminum;potassium;disulfate;dodecahydrate

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/aluminum-potassium-sulfate.json