Official EU label nameGlossary entry 7886

CYCLOTETRASILOXANE

This record confirms an official common ingredient name for EU cosmetic product labelling. It does not by itself confirm that the substance is permitted, unrestricted or safe.

Global evidence snapshot

The resolved identity has matching regulatory evidence in 0 of 13 indexed market datasets: 0 country records and 0 EU Annex records. Every result and evidence gap is listed below.

0 markets with evidence

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Markets with evidence

Evidence gaps

Resolved identifiers

Resolved substance identity

CAS:556-67-2293-51-6

EC:209-136-7

Ingredient index records:

CYCLOTETRASILOXANE

Cosmetic functions: HAIR CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SOLVENT

Octamethylcyclotetrasiloxane

Inventory restriction note: II/1388

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1 matched or reported name

CYCLOTETRASILOXANE

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name CYCLOTETRASILOXANE.

That is a statement about this inventory, not about the law: no imported rule is not evidence that a substance is permitted. A rule may exist under a different name, under a CAS or EC number this glossary entry does not carry, or in a dataset not yet imported.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 293-51-6

CAS 293-51-6PubChem CID 185471

Cyclotetrasiloxane

Cyclotetrasiloxane is a cyclosiloxane. — ChEBI

IUPAC name: 1,3,5,7,2,4,6,8-tetraoxatetrasilocane

Molecular formula: H8O4Si4
Molecular weight: 184.40 g/mol
Exact mass: 183.94996487 Da
Topological polar surface area: 36.9 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 0

Also known as

1,3,5,7,2,4,6,8-tetroxatetrasilocaneCHEBI:481451,3,5,7,2,4,6,8-tetroxatetrasilicocaneRefChem:129999CYCLOTETRASILOXANE [INCI]

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:48145

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

PubChem 2D chemical structure for CAS 556-67-2

CAS 556-67-2PubChem CID 11169

Octamethylcyclotetrasiloxane

Octamethylcyclotetrasiloxane is a cyclosiloxane that is the octamethyl derivative of cyclotetrasiloxane. It is an organosilicon compound and a cyclosiloxane. It derives from a hydride of a cyclotetrasiloxane. — ChEBI

IUPAC name: 2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane

Molecular formula: C8H24O4Si4
Molecular weight: 296.61 g/mol
Exact mass: 296.07516538 Da
Topological polar surface area: 36.9 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 0

Also known as

Cyclotetrasiloxane, octamethyl-OktamethylcyklotetrasiloxanOMCTSCyclic dimethylsiloxane tetramerCyclomethicone 4NUC silicone VS 7207Union carbide 7207Silicone SF 1173

16 more reported names

KF 994SF 1173UC 7207VS 7207NSC-345674CHEBI:25640RefChem:167770209-136-7Simethicone Impurity 3OktamethylzyklotetrasiloxanDimethylsiloxane Cyclic Tetramer2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetroxatetrasilocaneC8H24O4Si4CAS-556-67-2CCRIS 1327HSDB 6131

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External database identifiers

ChEBI:CHEBI:25640
ChEMBL:CHEMBL1869229
EPA DTXSID:DTXSID7027205
PubMed:36100151
PubMed:28927721
PubMed:27601420
PubMed:25680588
PubMed:22594975
PubMed:22575024
PubMed:22571757
PubMed:22304371
PubMed:22280441
PubMed:22071495
PubMed:21901312
PubMed:21716673

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Additional authoritative substance research

Each link searches that source for this identity. A link is a research route, not a claim that the source holds an exact record. What each source is, and its legal weight

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 US EPA CompTox CTX APIs

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Official source and scope

Imported from Commission Implementing Decision (EU) 2025/1175 (dataset version EU 2025/1175). The glossary supplies common ingredient names for the ingredient list required by Article 19(1)(g); it is not an approval or safety list.

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