Aluminum sulfate

E number E520CAS 10043-01-3

Aluminium sulfate is a firming agent used in pickles and some canned vegetables, and a clarifying agent. It is one of the additives contributing dietary aluminium.

Where it is and isn’t permitted

Status of Aluminum 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 182.1125retrieved 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 dissolving bauxite or aluminium hydroxide in sulfuric acid.

  • Vegan
  • Vegetarian
CAS registry number
10043-01-3
InChIKey
DIZPMCHEQGEION-UHFFFAOYSA-H
PubChem
CID 24850

Every name it appears under

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

E number

  • E520

CAS registry number

  • 10043-01-3
  • 10124-29-5

As it appears in regulation

  • Aluminum sulfate

Other names

  • Alum
  • ALUM CAKE
  • Aluminii sulfas
  • Aluminii sulfas, hydrate
  • aluminium potassium sulfate 12-hydrate
  • aluminium potassium sulfate hydrate (1:1:2:12)
  • Aluminium sulfate
  • Aluminium sulfate (2:3) hydrate
  • aluminium sulfate anhydrous
  • Aluminium sulfate, hydrate
  • Aluminium sulphate
  • Aluminium Sulphuricum
  • Aluminum alum
  • Aluminum alum (VAN)
  • Aluminum sesquisulfate
  • ALUMINUM SULFATE
  • Aluminum sulfate (2:3)
  • Aluminum Sulfate (2:3) Hydrate
  • Aluminum sulfate (3:2)
  • Aluminum sulfate (Al2(SO4)3)
  • Aluminum sulfate anhydrous
  • Aluminum Sulphate
  • Aluminum sulphate (2:3) hydrate
  • Aluminum sulphate anhydrous
  • Aluminum sulphate hydrate
  • Aluminum trisulfate
  • Aluminum(III) silfate
  • aluminum(III) sulfate
  • Cake alum (VAN)
  • dialuminium trisulfate
  • DIALUMINIUM(3+) ION TRISULFATE
  • Dialuminum sulfate
  • Dialuminum sulphate
  • Dialuminum trisulfate
  • Dialuminum Trisulfate Hydrate
  • E 520
  • FERTOSAN
  • Filter Alum
  • Gingi-Aid MAX Z-Twist 00
  • Gingi-Aid MAX Z-Twist 1
  • Gingi-Aid MAX Z-Twist 2
  • Gingi-Aid MAX Z-Twist 3
  • Hi Soft C 2
  • HIS Styptic Pencil
  • INS NO.520
  • INS-520
  • Nalco 7530
  • NICK RELIEF
  • Papermaker's Alum
  • Pearl Alum
  • Pickle Alum
  • Shaving Factory
  • Shaving Factory Disposable Styptic Pencil
  • Sulfatodialuminum disulfate (Al2(SO4)3)
  • SULFURIC ACID, ALUMINIUM SALT
  • Sulfuric acid, aluminum salt
  • Sulfuric acid, aluminum salt (3:2)
  • Sulfuric acid, aluminum(3+) salt (3:2)
  • Tai-Ace S 150
  • Trim Men Styptic Pencil

Systematic names

  • Dialuminum trisulfate

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-sulfate.json