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Silane USi-6801 – n-Octyltrimethoxysilane
Long-Chain Alkyl Silane for Superior, Invisible Water Repellency
CAS No.: 3069-40-7
EINECS No.: 221-338-7
Molecular Weight: 234.41 g/mol
Chemical Name:
n-Octyltrimethoxysilane
Synonyms:
Trimethoxy octyl silaneSilane USi-6801 is a high-purity long-chain alkyl-functional silane featuring a linear C8 (octyl) hydrophobic tail and three highly reactive methoxy groups. Specifically engineered as a surface modifier, it delivers deep-penetrating, permanent water repellency to porous inorganic substrates—including concrete, masonry, glass, mineral fillers, and inorganic pigments—without altering their appearance, texture, or breathability. Ideal for premium, clear, film-free waterproofing formulations.
🧪 Product Description
Chemical Formula: CH₃(CH₂)₇Si(OCH₃)₃
Chemical Structure:
![Structure: C₈H₁₇–Si(OCH₃)₃]USi-6801 leverages the power of an 8-carbon alkyl chain for maximum hydrophobic performance:
- The n-octyl group creates a dense, low-surface-energy monolayer that strongly repels liquid water
- The trimethoxysilane head rapidly hydrolyzes upon contact with ambient moisture to form reactive silanols, which covalently bond to hydroxylated surfaces (e.g., Si–OH on cement or glass) via robust Si–O–Si linkages
- Unlike topical sealers, it penetrates deeply into the substrate, providing protection from within—resisting UV degradation, abrasion, and weathering
- Treated surfaces remain completely unchanged visually: no gloss, darkening, film, or residue—preserving architectural integrity and slip resistance
✅ Key Advantage: Combines excellent water repellency with deep penetration and aesthetic neutrality—making it a top choice for heritage restoration and high-end construction.
📊 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) 0.902 – 0.912 g/cm³ Refractive Index (nD25) 1.4110 – 1.4210 Purity (GC, %) ≥ 98.0%
🏭 Key Applications
🔹 Premium Concrete & Masonry Waterproofing
- Formulated into high-performance penetrating sealers for bridges, tunnels, historic buildings, and coastal structures
- Provides long-term defense against water absorption, chloride ingress, freeze-thaw spalling, efflorescence, and rebar corrosion
- Complies with stringent standards for non-film-forming, vapor-permeable protection (e.g., ASTM C1543, EN 1504)
🔹 Hydrophobization of Mineral Fillers & Pigments
- Treats calcium carbonate, silica, talc, clay, and other inorganic additives to enhance moisture resistance, dispersion stability, and compatibility in polymer composites
- Reduces viscosity in filled systems and improves electrical insulation properties
🔹 Architectural Glass & Natural Stone Protection
- Applied to facades, tiles, and marble/granite surfaces to prevent water spotting, staining, and biological growth
- Maintains natural look, transparency, and slip coefficient
🔹 Dilutable Base for Custom Formulations
- Easily diluted with alcohols (e.g., methanol, ethanol) or compatible solvents to create concentrates or ready-to-use products
- Often blended with siloxanes or shorter-chain silanes for synergistic depth and durability
📦 Packaging
Available in industrial-grade containers:
- 200 L drum
- 1000 L IBC tote
All packaging ensures product integrity 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 gloves and eye protection
- Consult the latest Safety Data Sheet (SDS) at www.usi-chemical.com or upon request
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Your Global Source for High-Purity Long-Chain Alkyl Silanes- 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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