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CAS 921-53-9 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 5931815/10/2010

POTASSIUM TARTRATE

Potassium salt of tartaric acid

POTASSIUM 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 921-53-9

CAS 921-53-9PubChem CID 8984

Potassium Tartrate

Potassium L-tartrate is the potassium salt of L-tartaric acid. It contains a L-tartrate(2-). — ChEBI

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

Molecular formula: C4H4K2O6
Molecular weight: 226.27 g/mol
Exact mass: 225.92820081 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

O9WLL1ZL8SINS NO.336(II)INS-336(II)E-336(II)KALI TARTARICUMRefChem:57012Butanedioic acid, 2,3-dihydroxy-(2R,3R)-, dipotassium saltButanedioic acid, 2,3-dihydroxy-(2R,3R)-, potassium salt (1:2)

16 more reported names

213-067-8Dipotassium tartratePotassium L-tartrateButanedioic acid, 2,3-dihydroxy- (2R,3R)-, dipotassium saltdipotassium (2R,3R)-2,3-dihydroxybutanedioateL-Tartaric acid dipotassium salt147-78-4DIPOTASSIUM L-(+)-TARTRATE(2R,3R)-2,3-dihydroxysuccinic acid, potassium saltCream of tartarPotassium L-tartrate hydrateButanedioic acid, 2,3-dihydroxy- (2R,3R)-, potassium salt (1:2)argolSoluble tartarL-PotassiumtartrateEINECS 205-697-7

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External database identifiers

ChEBI:CHEBI:63018
EPA DTXSID:DTXSID90889442

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 TARTRATE

INCI name

POTASSIUM TARTRATE

Description

Potassium salt of tartaric acid

Record provenance

Inventory reference: 59318
Imported identity: POTASSIUM TARTRATE
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for POTASSIUM TARTRATE

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Key data

CAS

921-53-9

213-067-8

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.

#22771 · POTASSIUM TARTRATE

Ingredients with overlapping formulation functions

POTASSIUM MAGNESIUM ASPARTATEBUFFERING, SKIN PROTECTING

POTASSIUM OXIDEBUFFERING

POTASSIUM PHOSPHATEBUFFERING

POTASSIUM SODIUM TARTRATEBUFFERING

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

PROPANE TRICARBOXYLIC ACIDBUFFERING, CHELATING

QUINIC ACIDBUFFERING

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 TARTRATE appears in the CosIng inventory

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

BUFFERING

CAS 921-53-9 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 TARTRATE

This page reproduces the CosIng inventory entry for POTASSIUM 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 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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