Science
Mechanism of Action
This ingredient modifies surfaces by hydrolyzing its triethoxysilane groups into reactive silanol groups when moisture is present. These silanol groups subsequently form stable covalent bonds with hydroxyl groups on the substrate surface. The attached perfluorooctyl chain then confers robust water-repellent and oil-repellent characteristics. Additionally, it helps prevent powdered products from caking and can condition the skin.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The substance is considered moisture sensitive and reacts slowly with water.
Safety
Safety Profile
PERFLUOROOCTYLETHYL TRIETHOXYSILANE is classified as a per- and polyfluoroalkyl substance (PFAS), a chemical group known for its high environmental persistence. It has been linked to immunotoxicity, as well as reproductive and developmental toxicity in both humans and animals. Consequently, its use in cosmetics is no longer authorized in Europe, where it is identified as a persistent organic pollutant (POP) or as very persistent, very bioaccumulative, and toxic (PBT/vPvB), leading to its prohibition under the Stockholm Convention on POPs or restriction by REACH regulation. The U.S. FDA, in its 2025 report on PFAS in cosmetics, identified a similar PFAS (perfluorohexylethyl triethoxysilane) as a potential safety concern at its highest reported use levels in body lotion.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Due to its classification as a persistent and toxic PFAS, and its prohibition in European cosmetics, this ingredient poses significant environmental and health risks and should be avoided.
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