Official EU label nameGlossary entry 29262

TRIMETHYL PENTAPHENYL TRISILOXANE

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:3390-61-228855-11-0

EC:222-222-9

Ingredient index records:

TRIMETHYL PENTAPHENYL TRISILOXANE

Cosmetic functions: SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

Trisiloxane, Trimethylpentaphenyl-

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1 matched or reported name

TRIMETHYL PENTAPHENYL TRISILOXANE

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name TRIMETHYL PENTAPHENYL TRISILOXANE.

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 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

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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.

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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