Potassium sulfate

INS 515(i)CAS 7778-80-5

Used as an acidity regulator.

Potassium sulfate is an acidity regulator and a component of some salt substitutes and mineral waters.

Where it is and isn’t permitted

Status of 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 184.1643retrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFAPermitted, with conditions

1 food category

no numerical limit (good manufacturing practice)

CXS 192-1995 Table Three, INS 515(i)and 1 further provisionretrieved 2026-09-07

What it is made from

Mined or produced by reacting potassium chloride with sulfuric acid.

  • Vegan
  • Vegetarian
CAS registry number
7778-80-5
InChIKey
OTYBMLCTZGSZBG-UHFFFAOYSA-L
PubChem
CID 24507

Every name it appears under

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

INS number

  • 515(i)

CAS registry number

  • 7778-80-5

As it appears in regulation

  • Potassium sulfate

Other names

  • Arcanum duplicatum
  • Bestmade Natural Products Kali Sulph
  • BLI-801 Component Potassium sulfate
  • BLI801 Component Potassium sulfate
  • Caswell No. 702
  • Dipotassium sulfate
  • EPA Pesticide Chemical Code 005603
  • HSDB 5047
  • INS NO.515(I)
  • INS-515(I)
  • KALI SULPH
  • Kali Sulph 12X
  • Kali Sulph 200X
  • Kali Sulph 3X
  • Kali Sulph 6X
  • Kali sulphuricum
  • KALI SULPHURICUM 6X
  • Kali Sulphuricum 8007
  • KALIUM SULFURICUM 6X
  • Kalium sulphuricum
  • Kaliumsulfat
  • Pot sulf
  • Potassium (as sulfate)
  • Potassium in Potassium SuIfate
  • POTASSIUM SULFATE
  • Potassium sulfate (2:1)
  • Potassium sulfate (JP17/USAN)
  • Potassium sulfate (K2(SO4))
  • Potassium sulfate (K2SO4)
  • Potassium sulfate - $-beta
  • Potassium sulfate, 99.997% (metals basis)
  • POTASSIUM SULFATE, ACS
  • Potassium sulfate, Biochemical grade
  • Potassium sulfate, Trace metals grade 99.95%
  • Potassium sulphate
  • Potassium sulphate, containing in the dry state more than 52 per cent by weight of K2O
  • Potassiumsulfate
  • Reagecon Potassium Sulfate Solution SO4 100 microg/mL according to Chinese Pharmacopoeia (ChP) Limit Tests
  • Rxhomeo Homeopathic Combo 20
  • Rxhomeo Homeopathic Combo 3
  • Sulfato de potasio
  • Sulfuric acid dipotassium salt
  • Sulfuric acid potassium salt (1:2)
  • Sulfuric acid, potassium salt
  • Sulfuric acid, potassium salt (1:?)
  • Sulphuric acid, potassium salt
  • SUPREP BOWEL PREP KIT COMPONENT POTASSIUM SULFATE
  • Tartarus vitriolatus
  • TONICPET 7
  • USP Solution Potassium Sulfate TS Conforms to USP

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
  • gsfa 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/potassium-sulfate.json