# TRIMETHYLPENTYL/METHOXY PEG-10 PROPYL POLYSILSESQUIOXANE

URL: https://app.greenveil.ai/ingredients/ingredient_inci_trimethylpentyl_methoxy_peg_10_propyl_polysilsesquioxane
Categories: beauty
Functions: not reported
Identifier: TRIMETHYLPENTYL/METHOXY PEG-10 PROPYL POLYSILSESQUIOXANE

> TRIMETHYLPENTYL/METHOXY PEG-10 PROPYL POLYSILSESQUIOXANE is used as not reported. Canonical ingredient record built from 1 public-source records. Compiled from 1 published data source.

## Safety assessment

- Chemical concern: not yet assessed
- Is it a concern? We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.
- Rationale: Canonical ingredient record built from 1 public-source records.

## Regulatory status

- EU: Active — Trimethylpentyl/Methoxy PEG-10 Propyl Polysilsesquioxane is a resinous material composed of a mixture of three-dimensional siloxane polymers and oligomers with cage structures. For the oligomers, the 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/Methoxy PEG-10 Propyl Polysilsesquioxane is prepared by the hydrolysis and condensation of trimethylpentyl trimethoxysilane with Methoxy PEG-10 Propyltrimethoxysilane.

## Expert safety opinions

- SCCS (EU Scientific Committee on Consumer Safety): no opinion on file.
- CIR (Cosmetic Ingredient Review (US expert panel)): no opinion on file.

## Data sources

- CosIng (updated 2026-09-23): https://ec.europa.eu/growth/tools-databases/cosing/details/96411

_Assessed by Greenveil._