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Silane USi-6161 – N-Hexadecyltrimethoxysilane
Ultra-Long-Chain Alkyl Silane for Maximum Hydrophobicity & Advanced Surface Engineering
CAS No.: 16415-12-6
EINECS No.: 240-464-3
Chemical Name:
N-HexadecyltrimethoxysilaneSilane USi-6161 is a high-purity ultra-long-chain alkyl functional organosilane featuring a hydrophobic C₁₆ (hexadecyl or cetyl) tail and three reactive methoxy groups. It forms exceptionally dense, covalently bonded monolayers on inorganic surfaces—delivering superhydrophobic performance, outstanding moisture barrier properties, and superior compatibility with non-polar polymers. Ideal for extreme waterproofing, precision optical protection, and long-term conservation of outdoor heritage.
🧪 Product Description
Chemical Formula: CH₃(CH₂)₁₅Si(OCH₃)₃
Chemical Structure:
![Structure: C₁₆H₃₃–Si(OCH₃)₃]USi-6161 leverages the longest commercially practical alkyl chain (C₁₆) among standard alkylsilanes, offering unmatched surface modification capabilities:
- The C₁₆ chain enables tight molecular packing on surfaces → ultra-low surface energy (<20 mN/m)
- Achieves water contact angles >110°, significantly outperforming C8, C12, or C10 analogs
- The three methoxy groups ensure strong covalent bonding to metal oxides (SiO₂, Al₂O₃, etc.) via hydrolysis-condensation
- Provides excellent thermal and hydrolytic stability due to crystalline-like alkyl layer formation
This makes USi-6161 the premium choice when maximum water repellency, anti-fouling, and long-term durability are required.
📊 Typical Technical Data
The following values are typical and not intended for specification. Please confirm with our technical team before finalizing product requirements.
Parameter Specification Appearance Colorless transparent liquid Refractive Index (nD25) 1.440 ± 0.010 Relative Density (20°C) 0.89 ± 0.01 g/cm³ Purity (GC, %) ≥ 95.0%
🏭 Key Applications
🔹 Extreme Waterproofing of Inorganic Materials
- Effectively modifies glass, silica, alumina, kaolin, talc, mica, SiC, ceramics, and porcelain
- Creates a near-hermetic moisture barrier that drastically reduces water absorption
- Enhances mechanical strength, electrical insulation, and long-term stability of mineral-filled composites
🔹 High-Performance Anti-Fog & Anti-Condensation Coatings
- Applied to:
- Optical-grade glass (anti-reflective, reflective, vacuum-coated)
- Precision instruments, graduated scales, and metal-framed optical devices
- Prevents fogging by promoting rapid water beading and shedding
- Maintains optical clarity while providing durable environmental resistance
🔹 Long-Term Conservation of Outdoor Historical Relics
- Protects stone monuments, sculptures, facades, and archaeological artifacts from:
- Water penetration and capillary rise
- Salt efflorescence, freeze-thaw spalling, and acid rain etching
- Biological growth (algae, lichen) due to low surface energy
- Vapor-permeable yet liquid-water-repellent: allows internal moisture to escape without structural damage
🔹 Advanced Filler & Nanoparticle Surface Treatment
- Treats hydrophilic fillers for use in polyolefins (PP/PE), EPDM, and other non-polar polymers
- Improves dispersion, reduces viscosity, and minimizes agglomeration
- Enhances impact resistance, surface gloss, and hydrophobicity of final products
📦 Packaging
Available in industrial-grade containers:
- 180 kg iron drum
- 900 kg IBC tote
All packaging is hermetically sealed to prevent moisture exposure and preserve reactivity.
⚠️ Safety & Storage
- Store in original unopened containers at ambient temperature (≤35°C recommended)
- Keep away from heat and open flame (product is flammable)
- Shelf Life: 12 months from production date under recommended conditions
- Use in well-ventilated areas; avoid prolonged skin/eye contact
- Consult the latest Safety Data Sheet (SDS) at www.usi-chemical.com or upon request
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Leader in Ultra-Long-Chain Alkyl Silanes for Next-Generation Hydrophobic Solutions- Headquarters:
Room 2002, Overseas Chinese Plaza, No.1 Daqiao North Road, Nanjing 210031, Jiangsu, P.R. China - Factory Address:
Dongcheng Guanli District, Gaizhou 115200, Liaoning, P.R. China - Tel: +86-25-5889 5266 / 5889 5699
- Fax: +86-25-5830 5349
- Website: www.usi-chemical.com
- Email: mikey@usichemical.com
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