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CAS 25338-58-3 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 3560415/10/2010

OCTOXYNOL-9 CARBOXYLIC ACID

26-(Octylphenoxy)-3,6,9,12,15,18,21,24-octaoxahexacosanoic acid

OCTOXYNOL-9 CARBOXYLIC ACID 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 25338-58-3

CAS 25338-58-3PubChem CID 168358

Octoxynol-9 Carboxylic Acid

IUPAC name: 2-[2-[2-[2-[2-[2-[2-[2-[2-(2-octylphenoxy)ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]acetic acid

Molecular formula: C32H56O11
Molecular weight: 616.8 g/mol
Exact mass: 616.38226260 Da
XLogP3: 4.4
Topological polar surface area: 120.0 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 11
Covalent units: 1
Defined stereocentres: 0

Also known as

3,6,9,12,15,18,21,24-Octaoxahexacosanoic acid, 26-(octylphenoxy)-EINECS 246-867-0PEG-9 Octyl phenyl ether carboxylic acidRefChem:85606326-(2-OCTYLPHENOXY)-3,6,9,12,15,18,21,24-OCTAOXAHEXACOSANOIC ACID26-(2-octylphenoxy)-3,6,9,12,15,18,21,24-octaoxahexacosan-1-oic acid26-(Octylphenoxy)-3,6,9,12,15,18,21,24-octaoxahexacosanoic acidLQGIRXNHIMWFSU-UHFFFAOYSA-N

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID701010285

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 OCTOXYNOL-9 CARBOXYLIC ACID

INCI name

OCTOXYNOL-9 CARBOXYLIC ACID

Description

26-(Octylphenoxy)-3,6,9,12,15,18,21,24-octaoxahexacosanoic acid

Record provenance

Inventory reference: 35604
Imported identity: OCTOXYNOL-9 CARBOXYLIC ACID
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for OCTOXYNOL-9 CARBOXYLIC ACID

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Key data

CAS

25338-58-3

246-867-0

Restriction

—

Function

SURFACTANT - CLEANSING: Wetting body surfaces, emulsifying or solubilizing oils, and suspending soil (generally, such ingredients contribute to the foaming and lathering properties of cleansing products).

Official EU ingredient-name evidence

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

#17818 · OCTOXYNOL-9 CARBOXYLIC ACID

Ingredients with overlapping formulation functions

OCTOXYNOL-7SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

OCTOXYNOL-70CLEANSING, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

OCTOXYNOL-8SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

OCTOXYNOL-9SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

OCTYLDODECETH-10SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

OCTYLDODECETH-20CLEANSING, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

OCTYLDODECETH-25CLEANSING, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

OCTYLDODECETH-30SURFACTANT - CLEANSING

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 OCTOXYNOL-9 CARBOXYLIC ACID appears in the CosIng inventory

The CosIng inventory lists OCTOXYNOL-9 CARBOXYLIC ACID 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.

OCTOXYNOL-9 CARBOXYLIC ACID 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

OCTOXYNOL-9 CARBOXYLIC ACID 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, OCTOXYNOL-9 CARBOXYLIC ACID carries the following function designation(s):

SURFACTANT - CLEANSING

CAS 25338-58-3 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 OCTOXYNOL-9 CARBOXYLIC ACID

This page reproduces the CosIng inventory entry for OCTOXYNOL-9 CARBOXYLIC ACID 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 OCTOXYNOL-9 CARBOXYLIC ACID 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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