Ammonium sulfate

E number E517CAS 7783-20-2

Ammonium sulfate is a dough conditioner and yeast nutrient in bread making, supplying the nitrogen the yeast needs to work quickly.

Where it is and isn’t permitted

Status of Ammonium 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 184.1143retrieved 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 ammonia with sulfuric acid. It is also a major fertiliser, made at very large scale.

  • Vegan
  • Vegetarian
CAS registry number
7783-20-2
InChIKey
BFNBIHQBYMNNAN-UHFFFAOYSA-N
PubChem
CID 6097028

Every name it appears under

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

E number

  • E517

CAS registry number

  • 7783-20-2

As it appears in regulation

  • Ammonium sulfate

Other names

  • Actamaster
  • AMMONIUM SULFATE
  • Ammonium sulfate ((NH4)2SO4)
  • Ammonium sulfate (2:1)
  • Ammonium sulfate (NF)
  • Ammonium sulfate 2M solution in water (+/- 0.2M)
  • Ammonium Sulfate ACS grade
  • Ammonium sulfate, 99.99% metals basis
  • Ammonium sulfate, 99.999% (metals basis)
  • Ammonium sulfate, CP,98%
  • Ammonium Sulfate, Trace metals grade
  • Ammonium sulfate, ultrapure
  • Ammonium sulphate
  • AMMONIUM SULPHATE (2:1)
  • Ammonium sulphate,>/=99.0%,AR
  • Ammoniumsulfate
  • Caswell No. 048
  • Diammonium sulfate
  • Diammonium sulphate
  • diazanium sulfate
  • Dolamin
  • E 517
  • EPA Pesticide Chemical Code 005601
  • HSDB 471
  • Mascagnite
  • SU46BAM238
  • Sulfate Anion Standard Solution
  • Sulfate, ammonium
  • Sulfatom ammoniya
  • Sulfuric acid ammonium salt (1:2)
  • Sulfuric acid diammonium salt
  • sulphate of ammonia

Systematic names

  • diammonium sulfate

Hazard reference values

Values set by assessing bodies. A body that has not set a value is not listed here.
TypeValuePopulationAssessed byOpinion
ADI12.5 mg/kg bw/dayconsumersEFSAnot identified in the dataset

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/ammonium-sulfate.json