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Silane USi-6802 – n-Octyltriethoxysilane
Long-Chain Alkyl Silane for Deep-Penetrating, Breathable Water Repellency
CAS No.: 2943-75-1
EINECS No.: 220-941-2
Molecular Weight: 276.49 g/mol
Chemical Name:
n-Octyltriethoxysilane
Synonyms:
Triethoxy octyl silaneSilane USi-6802 is a high-purity long-chain alkyl-functional silane featuring a linear C8 (octyl) hydrophobic tail and three hydrolyzable ethoxy groups. Designed as a premium surface modifier, it provides deep-penetrating, permanent water repellency to porous inorganic substrates—including concrete, masonry, glass, mineral fillers, and inorganic pigments—while preserving their original appearance, texture, and vapor permeability. Ideal for formulating clear, film-free, eco-friendly waterproofing treatments with excellent substrate compatibility.
🧪 Product Description
Chemical Formula: CH₃(CH₂)₇Si(OC₂H₅)₃
Chemical Structure:
![Structure: C₈H₁₇–Si(OC₂H₅)₃]USi-6802 combines the hydrophobic power of an octyl chain with the controlled reactivity of ethoxy groups:
- The n-octyl group (C8) creates a dense, low-surface-energy monolayer that effectively repels liquid water
- The triethoxysilane moiety hydrolyzes more gradually than methoxy analogs, allowing deeper penetration into dense or low-porosity substrates before condensation occurs
- Forms covalent Si–O–Si bonds with hydroxylated surfaces (e.g., cement, glass, minerals), ensuring long-term durability and resistance to washing or UV exposure
- Unlike acrylics or silicones, it leaves no surface film—treated substrates remain breathable, non-glossy, and visually unchanged
✅ Key Advantage: Offers superior penetration depth and substrate compatibility compared to methoxy-based C8 silanes—ideal for dense concrete, precast elements, and sensitive mineral systems.
📊 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) 0.874 – 0.884 g/cm³ Refractive Index (nD25) 1.4120 – 1.4220 Purity (GC, %) ≥ 98.0%
🏭 Key Applications
🔹 High-Performance Concrete & Masonry Protection
- Formulated into deep-penetrating sealers for bridges, parking structures, marine environments, and historic restoration
- Prevents water ingress, chloride-induced corrosion, freeze-thaw damage, efflorescence, and alkali-silica reaction (ASR)
- Meets international standards for non-film-forming, vapor-permeable protection systems
🔹 Hydrophobization of Mineral Fillers & Pigments
- Treats calcium carbonate, silica, talc, clay, and other inorganic additives to improve moisture resistance, dispersion, and compatibility in polymer composites
- Enhances mechanical properties and processing stability in filled plastics, coatings, and adhesives
🔹 Architectural & Glazing Applications
- Applied to natural stone, ceramic tiles, and glass facades to reduce water spotting, staining, and maintenance
- Maintains aesthetic integrity, slip resistance, and optical clarity
🔹 Custom Formulation Base
- Easily diluted with alcohols (e.g., ethanol, IPA) or hydrocarbon solvents to create concentrates or ready-to-use products
- Compatible with siloxanes, other alkyl silanes, and emulsifiers for tailored performance profiles
📦 Packaging
Available in industrial-grade containers:
- 200 L drum
- 1000 L IBC tote
All packaging ensures stability during storage and transport.
⚠️ Safety & Storage
- Store in original unopened containers at ambient temperature
- 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; wear appropriate PPE (gloves, goggles)
- 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 Premium C8 Alkyl Silanes for Advanced Material Protection- 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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