TRIMETHYLPENTYL POLYSILSESQUIOXANE
Trimethylpentyl Polysilsesquioxane is a resinous material composed of a mixture of three-dimensional siloxane polymers and oligomers with cage structures. For the oligomers, each silicon atom in the polysilsesquioxane i…
TRIMETHYLPENTYL POLYSILSESQUIOXANE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.
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.
Chemical identity and properties
1,3,5,7,9,11,13,15-Octaoctyl-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
- IUPAC name
- 1,3,5,7,9,11,13,15-octaoctyl-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
- C64H136O12Si8
- Molecular weight
- 1322.4 g/mol
- Exact mass
- 1320.81859204 Da
- Topological polar surface area
- 111.0 Ų
- Hydrogen-bond donors
- 0
- Hydrogen-bond acceptors
- 12
- Covalent units
- 1
- Defined stereocentres
- 0
Also known as
External database identifiers
- EPA DTXSID:DTXSID801370450
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 TRIMETHYLPENTYL POLYSILSESQUIOXANE
INCI name
TRIMETHYLPENTYL POLYSILSESQUIOXANE
Description
Trimethylpentyl Polysilsesquioxane is a resinous material composed of a mixture of three-dimensional siloxane polymers and oligomers with cage structures. For the oligomers, each silicon atom in the polysilsesquioxane is connected via oxygen atoms to three other silicon atoms and can be represented by the empirical formulation RSiO3/2 where R represents the trimethylpentyl group. For the larger polymeric polysilsesquioxanes, some of the silicon atoms are not connected to other silicon atoms and instead have a silanol (SiOH) group. Trimethylpentyl Polysilsesquioxane is prepared by the hydrolysis and condensation of 2,4,4-trimethylpentyl trimethoxysilane
Record provenance
- Inventory reference
- 93229
- Imported identity
- TRIMETHYLPENTYL POLYSILSESQUIOXANE
- Source update
- 09/03/2016
Annex records for TRIMETHYLPENTYL POLYSILSESQUIOXANE
Key data
- NAIL CONDITIONING
- Improving and/or enhancing the cosmetic characteristics of the nail (moisturizing, increasing sheen, reducing brittleness and flaking, etc.).
Official EU ingredient-name evidence
The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.
Related inventory evidence
Ingredients with overlapping formulation functions
Additional official and scientific sources
11 external databases to check this identity in
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How TRIMETHYLPENTYL POLYSILSESQUIOXANE appears in the CosIng inventory
The CosIng inventory lists TRIMETHYLPENTYL POLYSILSESQUIOXANE 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.
TRIMETHYLPENTYL POLYSILSESQUIOXANE 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
Source note for TRIMETHYLPENTYL POLYSILSESQUIOXANE
This page reproduces the CosIng inventory entry for TRIMETHYLPENTYL POLYSILSESQUIOXANE 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 TRIMETHYLPENTYL POLYSILSESQUIOXANE 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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