Trimethoxycaprylylsilane

AKA: 3069-40-7, Trimethoxyoctylsilane, Octyltrimethoxysilane

Synthetic

Silicone

Plant Oil

Clean

Trimethoxyoctylsilane

Formula

C11H26O3Si

Mol. Weight

234.41

CAS #

3069-40-7

Form

Powder

State

Liquid; Dry Powder

Functions

Binding

Smoothing

Smooths skin texture

Traditional Use

A synthetic silane coupling agent developed for cosmetics in the late 20th century. Created to improve adhesion and water resistance in cosmetic film-forming products.

EWG

CIR

Safe as used

Pregnancy

Yes

CIR Safety Findings

Not a Sensitizer

medical-approval

all-shades-safe

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Yes

The paper trail

🔬Peer-reviewednone on file

⚖️Regulatory1 listing →

🛡️Safety-assessed2 reviews →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

Verified Jun 2026

Data: PubChem · CosIng · EWG · CIR