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Silane USi-6181 – Octadecyltrimethoxysilane (OTS)
The Gold Standard C₁₈ Alkyl Silane for Ultra-Hydrophobic Monolayers & Advanced Surface Modification
CAS No.: 3069-42-9
EINECS No.: 221-339-2
Chemical Name:
Octadecyltrimethoxysilane
Synonyms:
OTS; StearyltrimethoxysilaneSilane USi-6181 is a high-purity octadecyltrimethoxysilane (OTS)—the industry benchmark C₁₈ long-chain alkyl silane featuring an 18-carbon hydrophobic tail and three reactive methoxy groups. It forms exceptionally dense, crystalline-like, covalently bonded self-assembled monolayers (SAMs) on silicon oxide and other metal oxides, delivering maximum water repellency, ultra-low surface energy, and outstanding stability. Widely used in microelectronics, organic semiconductors, precision optics, and heritage conservation.
🧪 Product Description
Chemical Formula: CH₃(CH₂)₁₇Si(OCH₃)₃
Chemical Structure:
![Structure: C₁₈H₃₇–Si(OCH₃)₃]USi-6181 is the longest-chain commercial alkyltrimethoxysilane (C₁₈), offering unparalleled surface engineering performance:
- The C₁₈ chain enables near-perfect molecular packing on surfaces → achieves water contact angles >110°, among the highest possible with organosilanes
- Forms highly ordered, quasi-crystalline monolayers that act as robust moisture and ion diffusion barriers
- The three methoxy groups ensure strong, durable Si–O–Si/M covalent bonds with substrates like glass, quartz, ITO, and SiO₂
- Significantly reduces surface energy (<15 mN/m), enabling anti-wetting, anti-fouling, and anti-adhesion properties
In advanced electronics, OTS is known to enhance charge carrier mobility in organic semiconductors by passivating trap states at dielectric interfaces.
📊 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) 1.438 – 1.440 Relative Density (20°C) 0.89 ± 0.01 g/cm³ Purity (GC, %) ≥ 95.0%
🏭 Key Applications
🔹 Ultra-Hydrophobic & Oleophobic Surface Engineering
- Creates superhydrophobic coatings on glass, silicon wafers, quartz, ITO, alumina, and ceramics
- Used in MEMS/NEMS devices as a molecular lubricant to reduce stiction and friction
- Provides corrosion inhibition for metal oxides in humid or saline environments
🔹 Dielectric Interface Modification in Organic Electronics
- Passivates SiO₂ gate dielectrics in OFETs (organic field-effect transistors)
- Reduces interfacial trap density, leading to higher charge carrier mobility and lower operating voltage
- Compatible with both vacuum-deposited and solution-processed organic semiconductors
🔹 Anti-Fog & Anti-Condensation Protection for Precision Optics
- Applied to optical lenses, laser components, sensors, and instrumentation glass
- Prevents fogging by promoting instantaneous water beading and runoff
- Maintains optical transparency while providing long-term environmental resistance
🔹 Conservation of Sensitive Historical & Cultural Artifacts
- Protects outdoor stone monuments, sculptures, and archaeological relics from:
- Water ingress, freeze-thaw damage, and salt efflorescence
- Acid rain etching and biological colonization
- Vapor-permeable treatment: preserves breathability while blocking liquid water—critical for structural integrity
📦 Packaging
Available in industrial-grade containers:
- 180 kg iron drum
- 900 kg IBC tote
All packaging is hermetically sealed under dry conditions to prevent premature hydrolysis.
⚠️ 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 storage conditions
- Use in well-ventilated areas; avoid 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.
Global Supplier of High-Purity OTS for Electronics, Optics & Advanced Materials- 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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