Official EU label nameGlossary entry 13687

ISOBUTYL POLYSILSESQUIOXANE

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.

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Resolved identifiers

Resolved substance identity

CAS:221326-46-1

Ingredient index records:

ISOBUTYL POLYSILSESQUIOXANE

Cosmetic functions: NAIL CONDITIONING

Pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane, 1,3,5,7,9,11,13,15-octakis(2-methylpropyl)-

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1 matched or reported name

ISOBUTYL POLYSILSESQUIOXANE

Regulatory evidence across markets

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

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 221326-46-1

CAS 221326-46-1PubChem CID 4524693

Pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane, 1,3,5,7,9,11,13,15-octakis(2-methylpropyl)-

IUPAC name: 1,3,5,7,9,11,13,15-octakis(2-methylpropyl)-2,4,6,8,10,12,14,16,17,18,19,20-dodecaoxa-1,3,5,7,9,11,13,15-octasilapentacyclo[9.5.1.13,9.15,15.17,13]icosane

Molecular formula: C32H72O12Si8
Molecular weight: 873.6 g/mol
Exact mass: 872.31779000 Da
Topological polar surface area: 111.0 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 12
Covalent units: 1
Defined stereocentres: 0

Also known as

Pentacyclo(9.5.1.13,9.15,15.17,13)octasiloxane, octakis(2-methylpropyl)-Pentacyclo(9.5.1.13,9.15,15.17,13)octasiloxane, 1,3,5,7,9,11,13,15-octakis(2-methylpropyl)-Pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane, octakis(2-methylpropyl)-RefChem:859707OctaIsobutyl-POSSPSS-OCTAISOBUTYL SUBSTITUTED 97C32H72O12Si8Octakis(isobutyl)-silsesquioxane

4 more reported names

GPJIUZGXKCEIEO-UHFFFAOYSA-N1,3,5,7,9,11,13,15-octaisobutyl-2,4,6,8,10,12,14,16,17,18,19,20-dodecaoxa-1,3,5,7,9,11,13,15-octasilapentacyclo[9.5.1.13,9.15,15.17,13]icosaneAS-935761,3,5,7,9,11,13,15-Octakis(2-methylpropyl)pentacyclo[9.5.1.1~3,9~.1~5,15~.1~7,13~]octasiloxane

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External database identifiers

EPA DTXSID:DTXSID40944777

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

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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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