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InventoryRef 7541515/10/2010

CYCLOTRISILOXANE

Hexamethylcyclotrisiloxane

CYCLOTRISILOXANE 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 541-05-9
CAS 541-05-9PubChem CID 10914

Hexamethylcyclotrisiloxane

Hexamethylcyclotrisiloxane is an organosilicon compound. — ChEBI

IUPAC name
2,2,4,4,6,6-hexamethyl-1,3,5,2,4,6-trioxatrisilinane
Molecular formula
C6H18O3Si3
Molecular weight
222.46 g/mol
Exact mass
222.05637404 Da
Topological polar surface area
27.7 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
3
Covalent units
1
Defined stereocentres
0

Also known as

Cyclotrisiloxane, hexamethyl-Dimethylsiloxane cyclic trimerSDK 10EPV75L8O0RDC 246LS 8120RefChem:786203208-765-4
16 more reported names
C6H18O3Si3Simethicone Impurity 2CCRIS 1326UNII-EPV75L8O0REINECS 208-765-4AI3-62005hexamethyl-1,3,5,2,4,6-trioxatrisilinaneCyclotrisiloxane, 2,2,4,4,6,6-hexamethyl-EC 208-765-4Hexamethylcyclotrisiloxane, 98%HTDJPCNNEPUOOQ-UHFFFAOYSA-Hexamethylcyclotrisiloxane (NIST)CHEBI:189167CYCLOTRISILOXANE, HEXAMETHYLTox21_303233CH7260
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

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 CYCLOTRISILOXANE

INCI name

CYCLOTRISILOXANE

Description

Hexamethylcyclotrisiloxane

Record provenance

Inventory reference
75415
Imported identity
CYCLOTRISILOXANE
Source update
15/10/2010
European Commission CosIng source notes
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Key data

CAS
541-05-9
EC
208-765-4
Restriction
—
Function
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.
SKIN CONDITIONING
Maintaining the skin in good condition.
SKIN CONDITIONING - EMOLLIENT
Acting as lubricants on the skin surface providing the skin with a soft and smooth appearance.
SOLVENT
Dissolving other components of cosmetics. Solvents are usually liquids (aqueous and nonaqueous).

Ingredients with overlapping formulation functions

CYCLOHEXYL TOLUATESOLVENT, SURFACTANT - CLEANSING
CYCLOMETHICONEHAIR CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SOLVENT
CYCLOPENTASILOXANEHAIR CONDITIONING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SOLVENT
CYCLOTETRASILOXANEHAIR CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SOLVENT
DECAFLUOROPENTANESOLVENT
DECANEFRAGRANCE, PLASTICISER, SOLVENT, VISCOSITY CONTROLLING
DECARBOXY ROSINSOLVENT
DECENESOLVENT, VISCOSITY CONTROLLING

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 chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How CYCLOTRISILOXANE appears in the CosIng inventory

The CosIng inventory lists CYCLOTRISILOXANE 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.

CYCLOTRISILOXANE is also tagged with 4 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

CYCLOTRISILOXANE 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, CYCLOTRISILOXANE carries the following function designation(s):

CAS 541-05-9 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 CYCLOTRISILOXANE

This page reproduces the CosIng inventory entry for CYCLOTRISILOXANE 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 CYCLOTRISILOXANE 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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