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CAS 18027-45-7 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 9745723/10/2019

TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE

Trisiloxane, 3-[(dimethylsilyl)oxy]-1,1,5,5-tetramethyl-3-phenyl-

TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE 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 18027-45-7

CAS 18027-45-7PubChem CID 6335366

Phenyltris(dimethylsiloxy)silane

Molecular formula: C12H23O3Si4
Molecular weight: 327.65 g/mol
Exact mass: 327.07242573 Da
Topological polar surface area: 27.7 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 3
Covalent units: 1
Defined stereocentres: 0

Also known as

Tris(dimethylsiloxy)phenylsilane3-(Dimethylsilyloxy)-1,1,5,5-tetramethyl-3-phenyltrisiloxaneTrisiloxane, 3-[(dimethylsilyl)oxy]-1,1,5,5-tetramethyl-3-phenyl-Trisiloxane, 3-((dimethylsilyl)oxy)-1,1,5,5-tetramethyl-3-phenyl-phenyltris(dimethylsilyloxy)silaneEINECS 241-940-3Tris(dimethylsilyloxy)phenylsilaneLS-14153

3 more reported names

DB-044392CS-0158125D3762

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External database identifiers

EPA DTXSID:DTXSID70884793

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 TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE

INCI name

TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE

Description

Trisiloxane, 3-[(dimethylsilyl)oxy]-1,1,5,5-tetramethyl-3-phenyl-

Record provenance

Inventory reference: 97457
Imported identity: TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE
Source update: 23/10/2019

European Commission CosIng source notes

Annex records for TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE

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Key data

CAS

18027-45-7

241-940-3

Restriction

—

Function

FILM FORMING: Producing (upon application) a continuous film on the skin, hair or nails.

Official EU ingredient-name evidence

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

#29453 · TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE

Ingredients with overlapping formulation functions

TRIMETHYLSILYL CELLULOSEFILM FORMING; HAIR FIXING; HAIR WAVING OR STRAIGHTENING; UV ABSORBER; VISCOSITY CONTROLLING

TRIMETHYLSILYL PULLULANFILM FORMING, VISCOSITY CONTROLLING

TRIS(ACETIMINOACETOXYETHOXY METHACRYLATE) PPG-6 TRIMETHYLOLPROPANEBINDING, FILM FORMING

TRIS-HEA IPDI ISOCYANURATE TRIMERFILM FORMING

TRISILOXANEPROPYL GLYCERYL METHACRYLATEBINDING, FILM FORMING, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING, SURFACTANT - FOAM BOOSTING

TRITICUM AESTIVUM PEPTIDEFILM FORMING, HAIR CONDITIONING, SKIN CONDITIONING

TRITICUM VULGARE PROTEINBUFFERING, FILM FORMING, HAIR CONDITIONING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SKIN …

TROMETHAMINE ACRYLATES/ACRYLONITROGENS COPOLYMERFILM FORMING, 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 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 TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE appears in the CosIng inventory

The CosIng inventory lists TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE 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.

TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE 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

TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE 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, TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE carries the following function designation(s):

FILM FORMING

CAS 18027-45-7 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 TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE

This page reproduces the CosIng inventory entry for TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE 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 TRIS-HYDROGENDIMETHYL SILOXYPHENYLSILANE 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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