murphyTriethoxycaprylylsilane
AKA: Triethoxyoctylsilane, Triethoxy(octyl)silane, 2943-75-1, Octyltriethoxysilane, Octyl(triethoxy)silane, Dynasylan OCTEO, Prosil 9202, Silquest A 137, Prosil 9234
Synthetic
Emollient
Skin Conditioner
Synthetic
Clean
OriginTypically derived from coconut, palm kernel, or soybean oils as the plant-based starting material. Synthesized through silylation, chemically bonding silane groups to the fatty alcohol backbone of the plant oils.
The CIR Expert Panel concluded that the alkyl PEG ethers, listed below, are safe in the present practices of use and concentration described in this safety assessment when formulated to be nonirritating. This assessment is also intended to address future alkyl PEG ether cosmetic ingredients that vary from those ingredients recited herein only by the number of ethylene glycol repeat units...Oleth-30...
Formula
C14H32O3Si
Mol. Weight
276.49
CAS #
2943-75-1
Form
Powder
State
Dry Powder; Liquid; Dry Powder, Liquid
Skin Types
●all-skin-types
Best For
General
Functions
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Holds Formula Together
Holds ingredients together
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Insufficient
Pregnancy
—
CIR Safety Findings
Skin Irritant in Testing
2 studies / 2 irritating / reactions moderate (CIR 716)
Eye Irritant in Testing
2 studies / 2 irritating / reactions slight (CIR 716)
Concentration Guide
Leave-on0.000001–2.6%
Rinse-off0.0005–0.087%
0%50%100%
CIR reported use · 2015 survey
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR