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Silane USi-6802 ISO – Isooctyltriethoxysilane
Branched C8 Alkyl Silane for Enhanced Hydrophobicity & Filler Compatibility
CAS No.: 35435-21-3
Chemical Name:
Isooctyltriethoxysilane
(Synonym: Triethoxy(2,4,4-trimethylpentyl)silane)
Molecular Formula: C₁₄H₃₂O₃Si
Molecular Weight: 276.49 g/molSilane USi-6802 ISO is a high-purity branched-chain alkyl-functional silane featuring a bulky isooctyl (2,4,4-trimethylpentyl) hydrophobic group and three hydrolyzable ethoxy functionalities. Designed for superior performance in building waterproofing, filler surface treatment, and pigment dispersion, it delivers exceptional water repellency while significantly improving compatibility between inorganic materials and organic polymer matrices.
🧪 Product Description
Chemical Structure:
![Structure: (CH₃)₃C–CH₂–C(CH₃)₂–CH₂–Si(OC₂H₅)₃]Unlike linear octyl silanes, USi-6802 ISO’s highly branched isooctyl chain offers unique advantages:
- Enhanced steric bulk creates a denser, more effective hydrophobic barrier on surfaces
- Improved compatibility with non-polar polymers (e.g., polyolefins, EPDM, silicone) due to its aliphatic, branched nature
- Reacts with hydroxylated substrates (concrete, glass, minerals) to form covalent Si–O–Si bonds, ensuring permanent, wash-resistant protection
- Treated surfaces remain breathable, non-glossy, and visually unchanged—ideal for architectural applications
✅ Key Advantage: The branched isooctyl group provides superior hydrophobic efficiency and polymer-filler interfacial adhesion compared to linear analogs—making it ideal for demanding composite and construction applications.
📊 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) 0.879 g/cm³ Purity ≥ 98% Flash Point 63 °C Refractive Index (nD20) 1.41
🏭 Key Applications
🔹 Advanced Building Waterproofing & Protection
- Formulated into penetrating sealers for concrete, masonry, and natural stone
- Provides long-term resistance against water seepage, UV degradation, acid rain, and alkali corrosion
- Extends service life of structures in harsh environments (coastal, industrial, freeze-thaw zones)
🔹 Inorganic Filler Surface Treatment
- Treats calcium carbonate, silica, talc, clay, and other mineral fillers used in plastics, rubber, and resins
- Dramatically improves dispersibility, moisture resistance, and interfacial adhesion
- Reduces viscosity, enhances mechanical properties (tensile/flexural strength), and minimizes filler agglomeration
🔹 Pigment Dispersant & Stabilizer
- Applied to inorganic pigments to improve wetting, stability, and color strength in coatings and masterbatches
- Prevents flocculation and settling in liquid systems
📦 Packaging
Available in industrial-grade containers:
- 20 kg pail
- 190 kg drum
- 950 kg IBC tote
All packaging ensures product stability during storage and transport.
⚠️ Safety & Storage
- Store in original unopened containers at or below 25°C
- Keep away from heat and open flame (flash point: 63°C)
- Shelf Life: 24 months from production date (in 200L drum) 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.
Your Global Partner for High-Performance Branched 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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