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CAS 18684-11-2 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 7908415/10/2010

STEARTRIMONIUM METHOSULFATE

Trimethyl(octadecyl)ammonium methyl sulphate

STEARTRIMONIUM METHOSULFATE 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.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 18684-11-2

CAS 18684-11-2PubChem CID 87750

1-Octadecanaminium, N,N,N-trimethyl-, methyl sulfate (1:1)

The CIR Expert Panel concluded the following ingredients are safe in the present practices of use and concentration described in the safety assessment when formulated to be non-irritating...Steartrimonium Methosulfate... — Cosmetic Ingredient Review (CIR)

IUPAC name: methyl sulfate;trimethyl(octadecyl)azanium

Molecular formula: C22H49NO4S
Molecular weight: 423.7 g/mol
Exact mass: 423.33823022 Da
Topological polar surface area: 74.8 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 4
Covalent units: 2
Defined stereocentres: 0

Also known as

STEARTRIMONIUM METHOSULFATETrimethylstearylammonium methyl sulfateUNII-83454CS6TREMPIGEN CMEINECS 242-501-9Trimethylstearylammonium methylsulfateTrimethyloctadecylammonium methosulfateTrimethyloctadecylammonium, methyl sulfate

14 more reported names

1-Octadecanaminium, N,N,N-trimethyl-, methyl sulfateStearyl trimethylammonium methyl sulfateSTEARYLTRIMETHYLAMMONIUM METHYL SULFATEOCTADECYLTRIMETHYLAMMONIUM METHYL SULFATEN-OCTADECYL-N,N,N-TRIMETHYLAMMONIUM METHOSULFATERefChem:76738STEARTRIMONIUM METHOSULFATE [INCI]242-501-9Trimethyl(octadecyl)ammonium methyl sulphateStearyltrimonium methosulfateAmmonium, trimethyloctadecyl-, methyl sulfateN,N,N-Trimethyl-1-octadecanaminium methyl sulfaten,n,n-trimethyloctadecan-1-aminium methyl sulfateWYTNTFGZBBTWNR-UHFFFAOYSA-M

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID90885065

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 STEARTRIMONIUM METHOSULFATE

INCI name

STEARTRIMONIUM METHOSULFATE

Description

Trimethyl(octadecyl)ammonium methyl sulphate

Record provenance

Inventory reference: 79084
Imported identity: STEARTRIMONIUM METHOSULFATE
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for STEARTRIMONIUM METHOSULFATE

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Key data

CAS

18684-11-2

242-501-9

Restriction

—

Function

ANTISTATIC: Preventing and/or reducing static electricity by neutralising electrical charge on surfaces.
HAIR CONDITIONING: Enhancing the appearance and feel of hair. Leaving the hair easy to comb, supple, soft and shiny and/or imparting volume, lightness, gloss, texture, etc.

Official EU ingredient-name evidence

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

#27821 · STEARTRIMONIUM METHOSULFATE

Ingredients with overlapping formulation functions

STEAROYL SARCOSINEANTISTATIC, CLEANSING, HAIR CONDITIONING, SURFACTANT - CLEANSING

STEARTRIMONIUM BROMIDEANTISTATIC, HAIR CONDITIONING, PRESERVATIVE

STEARTRIMONIUM CHLORIDEANTISTATIC, HAIR CONDITIONING, PRESERVATIVE

STEARTRIMONIUM HYDROXYETHYL HYDROLYZED COLLAGENANTISTATIC, HAIR CONDITIONING, SKIN CONDITIONING

STEARTRIMONIUM SACCHARINATEANTISTATIC, HAIR CONDITIONING

STEARYL BETAINEANTISTATIC, CLEANSING, FOAMING, HAIR CONDITIONING, SKIN CONDITIONING, SURFACTANT - CLEANSING, SURFA…

STEARYL ETHYLHEXYLDIMONIUM CHLORIDEANTISTATIC, HAIR CONDITIONING

STEARYL ETHYLHEXYLDIMONIUM METHOSULFATEANTISTATIC, HAIR CONDITIONING

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 STEARTRIMONIUM METHOSULFATE appears in the CosIng inventory

The CosIng inventory lists STEARTRIMONIUM METHOSULFATE 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.

STEARTRIMONIUM METHOSULFATE is also tagged with 2 cosmetic functions 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

STEARTRIMONIUM METHOSULFATE 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, STEARTRIMONIUM METHOSULFATE carries the following function designation(s):

CAS 18684-11-2 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 STEARTRIMONIUM METHOSULFATE

This page reproduces the CosIng inventory entry for STEARTRIMONIUM METHOSULFATE 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 STEARTRIMONIUM METHOSULFATE 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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