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CAS 304-59-6 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 3702415/10/2010

POTASSIUM SODIUM TARTRATE

Potassium sodium tartrate

POTASSIUM SODIUM TARTRATE 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 304-59-6

CAS 304-59-6PubChem CID 9357

Potassium Sodium Tartrate

Potassium sodium L-tartrate is the organic sodium and potassium salt of L-tartaric acid (mol ratio 1:1:1). It has a role as a laxative. It is a potassium salt and an organic sodium salt. It contains a L-tartrate(2-). — ChEBI

IUPAC name: potassium;sodium;(2R,3R)-2,3-dihydroxybutanedioate

Molecular formula: C4H4KNaO6
Molecular weight: 210.16 g/mol
Exact mass: 209.95426361 Da
Topological polar surface area: 121.0 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 6
Covalent units: 3
Defined stereocentres: 2

Also known as

Rochelle saltSeignette saltSODIUM POTASSIUM TARTRATEMonopotassium monosodium tartrateSodium potassium L-tartratePotassium sodium L(+)-tartratePotassium sodium tartrate anhydrousP49F8NV7ES

16 more reported names

Tartaric acid, monopotassium monosodium salt2,3-Dihydroxybutanedioic acid, monopotassium monosodium saltButanedioic acid, 2,3-dihydroxy-, monopotassium monosodium saltCHEBI:63019INS NO.337Potassium sodium dextro-tartrateINS-337E-337Co eff pdrRefChem:570851Butanedioic acid, 2,3-dihydroxy-(2R,3R)-, monopotassium monosodium salt206-156-8613-385-0QH257BPV3J147-79-5CCRIS 3949

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External database identifiers

ChEBI:CHEBI:63019
EPA DTXSID:DTXSID60932999
EPA DTXSID:DTXSID90889341

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 SODIUM TARTRATE

INCI name

POTASSIUM SODIUM TARTRATE

INN name

potassium sodium tartrate

Description

Potassium sodium tartrate

Record provenance

Inventory reference: 37024
Imported identity: POTASSIUM SODIUM TARTRATE
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for POTASSIUM SODIUM TARTRATE

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Key data

CAS

304-59-6

206-156-8

Restriction

—

Function

BUFFERING: Stabilising the pH of an aqueous medium in a narrow range even if an acid or base is added. Altering and/or maintaining a cosmetic product's pH at the desired level.

Official EU ingredient-name evidence

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

#22756 · POTASSIUM SODIUM TARTRATE

Ingredients with overlapping formulation functions

POTASSIUM LACTATEBUFFERING, HUMECTANT, SKIN CONDITIONING

POTASSIUM MAGNESIUM ASPARTATEBUFFERING, SKIN PROTECTING

POTASSIUM OXIDEBUFFERING

POTASSIUM PHOSPHATEBUFFERING

POTASSIUM TARTRATEBUFFERING

PPG-70 BIS-(2-AMINOPROPYL) ETHERBUFFERING, BULKING, HAIR CONDITIONING

PROPANE TRICARBOXYLIC ACIDBUFFERING, CHELATING

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 SODIUM TARTRATE appears in the CosIng inventory

The CosIng inventory lists POTASSIUM SODIUM TARTRATE 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 SODIUM TARTRATE 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 SODIUM TARTRATE 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 SODIUM TARTRATE carries the following function designation(s):

BUFFERING

CAS 304-59-6 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 SODIUM TARTRATE

This page reproduces the CosIng inventory entry for POTASSIUM SODIUM TARTRATE 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 SODIUM TARTRATE 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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