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InventoryRef 8038915/10/2010

TRIMETHYL PENTAPHENYL TRISILOXANE

Trisiloxane, Trimethylpentaphenyl-

TRIMETHYL PENTAPHENYL TRISILOXANE 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 28855-11-0

CAS 28855-11-0CAS 3390-61-2PubChem CID 76925

Trimethyl pentaphenyl trisiloxane

IUPAC name: methyl-bis[[methyl(diphenyl)silyl]oxy]-phenylsilane

Molecular formula: C33H34O2Si3
Molecular weight: 546.9 g/mol
Exact mass: 546.18665993 Da
Topological polar surface area: 18.5 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 2
Covalent units: 1
Defined stereocentres: 0

Also known as

3390-61-21,3,5-Trimethyl-1,1,3,5,5-pentaphenyltrisiloxaneDow Corning 555Dow Corning 705PentaphenyltrimethyltrisiloxaneTrisiloxane, 1,3,5-trimethyl-1,1,3,5,5-pentaphenyl-EINECS 222-222-9HE7ABK56N5

14 more reported names

TRIMETHYLPENTAPHENYL TRISOLOXANERefChem:899749Dow Corning 705 silicone diffusion pumpTRIMETHYL PENTAPHENYL TRISILOXANE [INCI]Trisiloxane, 1,3,5trimethyl1,1,3,5,5pentaphenyl222-222-91,1,3,5,5-Pentaphenyl-1,3,5-trimethyltrisiloxaneC33H34O2Si3Silicone DC 705UNII-HE7ABK56N5methyl-bis[[methyl(diphenyl)silyl]oxy]-phenyl-silaneCS-04512591,1,2,3,3-Pentaphenyl 1,2,3 trimethyltrisiloxane1,3,5-trimethyl-1,1,3,5,5-pentaphenyl-trisiloxane

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID7063007

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 TRIMETHYL PENTAPHENYL TRISILOXANE

INCI name

TRIMETHYL PENTAPHENYL TRISILOXANE

Description

Trisiloxane, Trimethylpentaphenyl-

Record provenance

Inventory reference: 80389
Imported identity: TRIMETHYL PENTAPHENYL TRISILOXANE
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for TRIMETHYL PENTAPHENYL TRISILOXANE

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Key data

CAS

3390-61-2 / 28855-11-0

222-222-9

Restriction

—

Function

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.

Official EU ingredient-name evidence

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

#29262 · TRIMETHYL PENTAPHENYL TRISILOXANE

Ingredients with overlapping formulation functions

TRIISOSTEARYL TRILINOLEATESKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, VISCOSITY CONTROLLING

TRILAURYL CITRATESKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

TRILINOLEIC ACIDREFATTING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, VISCOSITY CONTROLLING

TRILINOLENINREFATTING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, VISCOSITY CONTROLLING

TRIMETHYLENE ASCORBATESKIN CONDITIONING - EMOLLIENT; HUMECTANT; SKIN CONDITIONING - HUMECTANT; SKIN CONDITIONING - MISCEL…

TRIMETHYLOLPROPANE TRICAPRYLATE/TRICAPRATESKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

TRIMETHYLOLPROPANE TRICOCOATESKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

TRIMETHYLOLPROPANE TRIETHYLHEXANOATESKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

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 TRIMETHYL PENTAPHENYL TRISILOXANE appears in the CosIng inventory

The CosIng inventory lists TRIMETHYL PENTAPHENYL TRISILOXANE 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.

TRIMETHYL PENTAPHENYL TRISILOXANE 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

TRIMETHYL PENTAPHENYL TRISILOXANE 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, TRIMETHYL PENTAPHENYL TRISILOXANE carries the following function designation(s):

CAS 3390-61-2 / 28855-11-0 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 TRIMETHYL PENTAPHENYL TRISILOXANE

This page reproduces the CosIng inventory entry for TRIMETHYL PENTAPHENYL TRISILOXANE 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 TRIMETHYL PENTAPHENYL TRISILOXANE 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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