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Silane USi-6121 – N-Dodecyltrimethoxysilane
Long-Chain Alkyl Silane for Maximum Hydrophobicity & Inorganic Surface Functionalization
CAS No.: 3069-21-4
EINECS No.: 221-332-4
Molecular Weight: 290.52 g/mol
Chemical Name:
N-Dodecyltrimethoxysilane
Synonyms:
1-(Trimethoxysilyl)dodecaneSilane USi-6121 is a high-purity long-chain alkyl functional organosilane featuring a hydrophobic C₁₂ (dodecyl) tail and three reactive methoxy groups. It forms dense, covalently bonded monolayers on inorganic surfaces—delivering exceptional water repellency, anti-fouling properties, and enhanced compatibility with non-polar polymers. Ideal for advanced waterproofing, optical glass protection, and outdoor heritage conservation.
🧪 Product Description
Chemical Formula: CH₃(CH₂)₁₁Si(OCH₃)₃
Chemical Structure:
![Structure: C₁₂H₂₅–Si(OCH₃)₃]USi-6121 combines strong surface anchoring (via trialkoxysilane) with extreme hydrophobicity (from the C₁₂ alkyl chain). Key advantages include:
- Superior water contact angles (>100°) on treated surfaces
- Dense molecular packing due to long alkyl chain → excellent moisture barrier
- Enhanced dispersion of mineral fillers in polyolefins, rubbers, and thermoplastics
- Chemical bonding to metal oxides (SiO₂, Al₂O₃, etc.) ensures durability against washing and weathering
Unlike short-chain analogs (e.g., methyl or octyl silanes), the C₁₂ chain provides optimal balance between hydrophobicity, steric stability, and synthetic feasibility.
📊 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 Specific Gravity (20°C) 0.885 – 0.895 g/cm³ Refractive Index (nD25) 1.4220 – 1.4320 Purity (GC, %) ≥ 96.0%
🏭 Key Applications
🔹 Ultra-Hydrophobic Treatment of Inorganic Materials
- Effectively modifies glass, silica, alumina, kaolin, talc, mica, SiC, porcelain, and ceramics
- Creates a water-repellent interface that improves filler-matrix adhesion in composites
- Reduces moisture absorption and enhances mechanical strength, electrical insulation, and long-term stability
🔹 Anti-Fog & Anti-Condensation Coatings for Glass
- Applied to:
- Blank and coated architectural glass (anti-reflective, reflective, vacuum-deposited)
- Optical lenses, precision instruments, and metal-framed devices
- Prevents fog formation by promoting water beading and rapid runoff
- Maintains optical clarity while providing durable protection
🔹 Conservation of Outdoor Historical Relics
- Protects stone monuments, sculptures, archaeological artifacts, and heritage buildings from:
- Water penetration and capillary rise
- Salt efflorescence and subflorescence
- Freeze-thaw spalling and biological colonization
- Vapor-permeable: allows trapped moisture to escape while blocking liquid water—preserving structural integrity
🔹 Filler & Pigment Surface Engineering
- Treats mineral fillers to improve:
- Dispersibility in non-polar matrices (PP, PE, EPDM)
- Rheology control and reduced sedimentation
- Impact resistance and surface finish in molded parts
📦 Packaging
Available in industrial-grade containers:
- 20 kg pail
- 180 kg drum
- 900 kg IBC tote
All packaging is hermetically sealed to prevent moisture ingress and preserve reactivity.
⚠️ Safety & Storage
- Store in original unopened containers at or below 35°C
- 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 Long-Chain Alkyl Silanes for Advanced Surface Protection & Composite Enhancement- 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: inquiry@usichemical.com
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