beauty

Phenethyl trimethicone

CAS 2347143-25-1

Concern score

Not assessed — no hazard data yet.

Phenethyl trimethicone in plain language

What it is: Also known as Phenyl Trimethicone · phenethyl Silsesquioxanes
What it does: Used in cosmetics as a hair conditioner. Phenethyl Trimethicone is the siloxane polymer.
Hair conditioning
Is it a concern?: We haven't assessed a concern score for this ingredient yet. It is listed for cosmetic use in the EU.

What we know about this ingredient

EPA DSSTox provides the canonical identifier, structure, and synonym profile for this chemical.

Regulation

No restrictions found. Phenethyl trimethicone appears in these published regulatory listings.

EUCosIngActivePhenethyl Trimethicone is the siloxane polymer that conforms generally to the formula:
- Phenethyl Trimethicone is the siloxane polymer that conforms generally to the formula:Source →

Expert safety opinions

No expert opinion on file for Phenethyl trimethicone. These are the independent scientific bodies that assess ingredients like this one; we show an opinion only when a record we hold cites it.

SCCS
EU Scientific Committee on Consumer Safety
No SCCS opinion on file.
CIR
Cosmetic Ingredient Review (US expert panel)
No CIR safety assessment on file.

Evidence & sources

No graded research studies for Phenethyl trimethicone yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

2 data sources

Where this comes from

CosIng
regulatory · updated 2026-09-23
Open →
EPA DSSTox Identifiers
chemistry · updated 2025-12-29
Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

Nothing to weigh for this context yet.

No signal in this context

We have no published hazard signal for this ingredient, so we cannot say how it behaves in this context — that is missing evidence, not a clean result.

Catalog

Found in these products

Their ingredient lists include Phenethyl trimethicone; each product's own rating depends on its whole formula, so it is shown on the product page, not here.

See all 20 →Find products without it →

Co-occurrence

Often appears with

Ingredients that frequently appear alongside Phenethyl trimethicone in the catalog.