1H,1H,2H,2H-Perfluorooctyltrimethoxysilane Fluoro silane CAS 85857-16-5 raw material for soil-repellent coating

Perfluorooctyltrimethoxysilane Product Overview

1H,1H,2H,2H-Perfluorooctyltrimethoxysilane (Siwin-F831) is a fluoroalkyl-functional silane designed for surface energy reduction in high-performance coating applications. With CAS registry number 85857-16-5, this colorless clear liquid combines a reactive trimethoxysilane head group with a perfluorinated alkyl tail, enabling the formation of low-surface-energy monolayers on various substrates.

The perfluorooctyl chain contains 13 fluorine atoms distributed across six perfluorinated carbon atoms, contributing to low surface energy, water repellency, and oil repellency. The trimethoxysilane group hydrolyzes and bonds to hydroxyl-bearing surfaces, including glass, metals, ceramics, and metal oxides. Industrial clients in optical coating, release coating, and stain-resistant coating manufacturing use this material as a surface modification agent. The product is also referenced as tridecafluorooctyltrimethoxysilane or FOTS in technical literature.

Fluoro Silane Physical Properties and Specifications

Typical Physical Properties

Perfluorooctyltrimethoxysilane Industrial Applications

Anti-Smudge and Stain-Resistant Coatings

Siwin-F831 serves as a key raw material in formulating stain-resistant and anti-smudge coatings for glass, ceramic, and metal surfaces. The fluorinated silane forms a covalently bonded surface layer that reduces surface energy, causing water and oil-based contaminants to bead and roll off rather than spread or adhere. This property finds application in architectural glass, electronic display surfaces, and kitchen and bathroom fixtures where easy-clean performance is required.

Release Coating Systems

Formulators use perfluorooctyltrimethoxysilane in release coating formulations for molds, rollers, and processing equipment. The low-surface-energy fluorinated layer provides release properties for adhesives, resins, and other tacky materials. Compared with hydrocarbon-based release agents, the fluorinated silane offers thermal stability and chemical resistance that support repeated release cycles.

Anti-Reflective Coating Surface Treatment

In optical coating applications, Siwin-F831 provides surface modification for anti-reflective (AR) coating stacks. The silane treatment modifies the top surface of AR coatings to add water- and oil-repellent properties without significantly altering optical transmission characteristics. This application supports optical components, eyewear lenses, and display cover glass where both anti-reflective performance and cleanability are required.

Surface Energy Modification of Inorganic Materials

Researchers and process engineers use this fluoro silane to modify the surface energy of various inorganic materials, including silicon wafers, metal oxides, and ceramic substrates. The self-assembled monolayer formation creates a well-defined fluorinated surface with predictable contact angle characteristics, supporting applications in microfabrication, biosensor development, and surface science research.

Fluoro Silane Surface Modification Mechanism

The surface modification process begins when the trimethoxysilane groups of Siwin-F831 hydrolyze in the presence of moisture, generating reactive silanol (Si-OH) species. These silanol groups condense with hydroxyl groups present on the substrate surface, forming stable covalent Si-O-substrate bonds. The perfluorooctyl chains orient away from the surface, presenting a fluorine-rich outer layer.

This ordered molecular arrangement produces a surface with significantly reduced surface energy, measured by higher water and oil contact angles. The degree of surface energy reduction depends on factors including application method, concentration, curing temperature, and substrate surface preparation. Vapor-phase deposition and solution-based application methods both support the formation of fluorinated silane monolayers.

Perfluorooctyltrimethoxysilane Packaging and Storage

Siwin-F831 is supplied in 200L PVF-lined steel drums as standard packaging, with alternative packaging configurations available on request for commercial procurement. The material requires storage in a cool, dry location away from direct sunlight. Containers must remain tightly sealed when not in use to prevent moisture ingress, which can cause premature hydrolysis of the methoxysilane groups. Recommended storage conditions support a shelf life of 12 months from the date of manufacture when properly stored. Material Safety Data Sheets detailing handling procedures, personal protective equipment requirements, and emergency response measures are provided with each shipment.

Fluoro Silane Quality Assurance and Manufacturing

Siwin produces Siwin-F831 with a minimum purity of 98% as verified by gas chromatography analysis. Each production batch undergoes refractive index measurement and density testing to confirm compliance with specification parameters. Certificates of Analysis are supplied with every delivery, enabling enterprise customers to verify incoming material quality against their own quality control requirements. The manufacturing process follows documented procedures to ensure batch-to-batch consistency, supporting formulation stability for industrial users who require predictable performance in their coating systems.

FAQ About Perfluorooctyltrimethoxysilane

What is perfluorooctyltrimethoxysilane used for?

Perfluorooctyltrimethoxysilane is used as a surface modification agent in the production of stain-resistant coatings, anti-smudge coatings, release coatings, and anti-reflective coating surface treatments. It reduces surface energy on glass, metal, and ceramic substrates to impart water-repellent and oil-repellent properties.

How is fluoro silane applied to surfaces?

Application methods include solution-based dipping or spraying, and vapor-phase deposition. The choice depends on substrate geometry, desired coating thickness, and production scale. Both methods rely on hydrolysis of the methoxysilane groups followed by condensation with surface hydroxyl groups to form covalent bonds.

What purity level is Siwin-F831 available in?

Siwin-F831 is manufactured at a minimum purity of 98% as determined by gas chromatography. Each batch is accompanied by a Certificate of Analysis reporting purity, refractive index, density, and other specification parameters.

What substrates are compatible with this fluoro silane?

Perfluorooctyltrimethoxysilane bonds effectively to substrates with surface hydroxyl groups, including glass, silica, silicon wafers, metal oxides, ceramics, and certain metals. Surface preparation to ensure clean, hydroxyl-rich surfaces supports optimal bonding and coating performance.