F8261
Evonik
Siwin-F832
51851-37-7
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1H,1H,2H,2H-Perfluorooctyltriethoxysilane is a fluorinated organosilane that combines a perfluorinated alkyl chain with a triethoxysilyl functional group. The perfluorinated segment imparts exceptionally low surface energy to treated surfaces, while the triethoxysilyl group provides the means for covalent attachment to inorganic substrates through siloxane bond formation. This combination makes the compound a surface modification agent for applications requiring water repellency, oil repellency, anti-fouling, and corrosion resistance.
The chemical formula of 1H,1H,2H,2H-perfluorooctyltriethoxysilane is C₁₄H₁₉F₁₃O₃Si, with a molecular weight of 510.37 g/mol. The molecule features a six-carbon perfluorinated segment (CF₃(CF₂)₅-) connected via a two-carbon ethylene bridge (-CH₂CH₂-) to a triethoxysilyl group (-Si(OCH₂CH₃)₃). The perfluorinated alkyl chain is characterized by the strong electronegativity of fluorine atoms and the low polarizability of C-F bonds, which result in very low surface free energy. When the silane forms a self-assembled monolayer on a substrate, the CF₃ end groups orient toward the surface, creating a low-energy interface that resists wetting by both water and oils. Treated surfaces can achieve water contact angles above 150°, placing them in the superhydrophobic range.
Parameter | Value |
|---|---|
Product Code | Siwin-F832 |
Chemical Name | 1H,1H,2H,2H-Perfluorooctyltriethoxysilane |
CAS No. | 51851-37-7 |
EINECS No. | 257-473-3 |
Molecular Formula | C₁₄H₁₉F₁₃O₃Si |
Molecular Weight | 510.37 g/mol |
Appearance | Colorless to light yellow clear liquid |
Purity (by GC) | ≥ 97% |
Density (25°C) | 1.33 g/mL |
Refractive Index (25°C) | 1.345 |
Boiling Point | 220°C |
Flash Point | 85°C (closed cup) |
Melting Point | <-38°C |
Solubility | Miscible with alcohols, aromatic and aliphatic hydrocarbons |
1H,1H,2H,2H-Perfluorooctyltriethoxysilane is used across several industrial sectors where surface energy reduction and repellency properties are critical to product performance.
In coating formulations, this fluoro silane is incorporated into ORMOCER (organically modified ceramic) coatings and other surface treatment systems to impart hydrophobic and oleophobic properties. When applied to glass, ceramic, or metal surfaces, the silane forms a covalently bonded fluorinated layer that reduces surface energy. This treatment finds use in architectural glass coatings, where it facilitates water sheeting and reduces the adhesion of dirt and contaminants, making surfaces easier to clean.
The fluorinated silane layer repels aqueous electrolyte solutions from metallic substrates, providing a barrier that slows the ingress of moisture and corrosive ions. This property is utilized in metal surface treatment processes where the silane is applied as part of a multi-layer coating system to enhance corrosion resistance on aluminum, steel, and other metal substrates.
In the conservation of stone, concrete, masonry, and cultural heritage artifacts, this fluoro silane is applied as a water-repellent and anti-stain treatment. The silane penetrates into the porous substrate and forms a hydrophobic network that reduces water absorption while maintaining vapor permeability. This helps protect the material from water damage, freeze-thaw cycling, efflorescence, and staining from environmental contaminants, without significantly altering the visual appearance of the surface.
In electronics and optoelectronics manufacturing, the silane is used for surface modification of substrates such as glass, silica nanoparticles, and metal oxides. Its low surface energy properties are exploited in applications ranging from anti-reflective coatings to 3D inkjet printing substrate treatment and dye-sensitized solar cell engineering, where the fluorinated self-assembled monolayer modifies surface wetting and interfacial energy characteristics.
Surfaces treated with 1H,1H,2H,2H-perfluorooctyltriethoxysilane exhibit both water repellency and oil repellency due to the low surface energy of the perfluorinated alkyl chain. Water contact angles above 150° have been reported on properly prepared substrates, qualifying as superhydrophobic. The degree of repellency depends on factors including silane concentration, application method, curing conditions, and substrate surface roughness.
The perfluorinated carbon chain is highly resistant to chemical attack due to the strength of the C-F bond and the shielding effect of fluorine atoms. Treated surfaces maintain their repellency properties under exposure to a wide range of chemicals and environmental conditions. The silane also exhibits thermal stability suitable for most coating curing processes, with the fluorinated segment remaining intact at temperatures well above typical processing temperatures for organic coatings.
1H,1H,2H,2H-Perfluorooctyltriethoxysilane is supplied in sealed containers to prevent moisture ingress. Standard packaging options include drums and intermediate bulk containers, with specific configurations available upon request. The product should be stored in a cool, dry area, away from direct sunlight and sources of moisture. Containers must be kept tightly closed when not in use, as the triethoxysilyl group is moisture-sensitive and will undergo gradual hydrolysis upon exposure to atmospheric humidity. Under proper storage conditions, the shelf life is 12 months from the date of manufacture.
This product should be handled in well-ventilated areas with appropriate personal protective equipment, including chemical-resistant gloves, safety goggles, and protective clothing. Avoid contact with skin, eyes, and clothing. Avoid inhalation of vapors. The product is flammable and should be kept away from open flames and high-temperature sources. For complete safety information, including hazard classification, first-aid measures, and handling procedures, refer to the Safety Data Sheet (SDS).
1H,1H,2H,2H-Perfluorooctyltriethoxysilane forms covalent bonds with substrates that contain surface hydroxyl groups, including glass, silica, quartz, ceramics, stone, concrete, and metal oxides such as aluminum oxide and titanium dioxide. It can also be used to modify the surface of silica nanoparticles and other inorganic fillers. Substrates without surface hydroxyl groups typically require pre-treatment to generate reactive sites.
Typical working concentrations range from 0.5% to 5.0% by weight, depending on the application method, substrate porosity, and desired performance level. For dense, non-porous surfaces such as glass, lower concentrations in the range of 0.5% to 2.0% are often sufficient. For porous substrates such as stone or concrete, higher concentrations and multiple applications may be required to achieve adequate penetration and repellency.
This silane is miscible with alcohols (such as ethanol and isopropanol), aromatic hydrocarbons (such as toluene and xylene), and aliphatic hydrocarbons. The choice of solvent depends on the application method, substrate compatibility, and desired evaporation rate. Alcohol-based solutions are commonly used for many surface treatment applications.
After application, the silane requires hydrolysis and condensation to form a stable siloxane network on the substrate. Curing typically occurs at room temperature in the presence of atmospheric moisture over a period of several hours to 24 hours. Elevated temperature curing (e.g., 80°C to 120°C) can accelerate the process and may improve crosslink density. The specific curing schedule should be optimized for each substrate and application.
1H,1H,2H,2H-Perfluorooctyltriethoxysilane is listed under REACH Annex XVII. Users are responsible for verifying compliance with applicable local, national, and international regulations regarding the use, handling, storage, and disposal of fluorinated chemicals. It is recommended to review the latest regulatory status and consult with regulatory compliance experts for specific market requirements.
Yes, a detailed Technical Data Sheet (TDS) and Safety Data Sheet (SDS) are available upon request. Sample quantities can also be provided for evaluation and formulation development. Contact the technical sales team to request documentation, samples, or application-specific guidance.
