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CAS 13932-13-3 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

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InventoryRef 5932115/10/2010

POTASSIUM TETRATHIONATE

Tetrathionic acid, dipotassium salt

POTASSIUM TETRATHIONATE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 13932-13-3

CAS 13932-13-3PubChem CID 61701

Potassium Tetrathionate

Potassium tetrathionate is a potassium salt composed of potassium and tetrathionate ions in a 2:1 ratio. It contains a tetrathionate(2-). — ChEBI

Molecular formula: K2O6S4
Molecular weight: 302.5 g/mol
Exact mass: 301.7851854 Da
Topological polar surface area: 182.0 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 8
Covalent units: 3
Defined stereocentres: 0

Also known as

Tetrathionic acid, dipotassium saltDipotassium tetrathionateTetrathionic acid, potassium salt (1:2)8X6V5C8FZ9CHEBI:86466Tetrathionate, PotassiumRefChem:175623237-702-3

15 more reported names

POTASSIUMTETRATHIONATEEINECS 237-702-3UNII-8X6V5C8FZ9Potassium tetrathionate [K2S406]POTASSIUM TETRATHIONATE (K2S4O6)CAS-13932-13-3Caswell No. 702AEPA Pesticide Chemical Code 075903FT-0689262K2O6S4UVTKHPSJNFFIDG-UHFFFAOYSA-LTox21_302315Tetrathionic acid,potassium salt (1:2)DB-231703CS-0196759

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:86466
ChEMBL:CHEMBL3187989
EPA DTXSID:DTXSID9047043

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for POTASSIUM TETRATHIONATE

INCI name

POTASSIUM TETRATHIONATE

Description

Tetrathionic acid, dipotassium salt

Record provenance

Inventory reference: 59321
Imported identity: POTASSIUM TETRATHIONATE
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for POTASSIUM TETRATHIONATE

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Key data

CAS

13932-13-3

237-702-3

Restriction

—

Function

REDUCING: Changing the chemical nature of another ingredient by adding hydrogen (or removing oxygen).

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#22777 · POTASSIUM TETRATHIONATE

Ingredients with overlapping formulation functions

P-HYDROXYANISOLEANTIOXIDANT, REDUCING

PHALAENOPSIS APHRODITE CALLUS EXTRACTANTIOXIDANT, REDUCING, SKIN PROTECTING

POTASSIUM METABISULFITEHAIR WAVING OR STRAIGHTENING, PRESERVATIVE, REDUCING

POTASSIUM SULFITEANTIOXIDANT, HAIR WAVING OR STRAIGHTENING, PRESERVATIVE, REDUCING

RH-POLYPEPTIDE-28REDUCING, SKIN CONDITIONING

RH-POLYPEPTIDE-60REDUCING, SKIN CONDITIONING

S-DNA APTAMER-2ANTIOXIDANT; REDUCING; SKIN PROTECTING; UV FILTER; pH ADJUSTERS

S-DNA APTAMER-3ANTIOXIDANT; REDUCING; SKIN PROTECTING; SKIN CONDITIONING - HUMECTANT

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal

How POTASSIUM TETRATHIONATE appears in the CosIng inventory

The CosIng inventory lists POTASSIUM TETRATHIONATE as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

POTASSIUM TETRATHIONATE is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

POTASSIUM TETRATHIONATE is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, POTASSIUM TETRATHIONATE carries the following function designation(s):

REDUCING

CAS 13932-13-3 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for POTASSIUM TETRATHIONATE

This page reproduces the CosIng inventory entry for POTASSIUM TETRATHIONATE from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research POTASSIUM TETRATHIONATE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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