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Silane USi-6042 – Tetraethyl Orthosilicate (TEOS)
High-Purity Non-Organoreactive Alkoxysilane for Binders & Inorganic Matrices
CAS No.: 78-10-4
EINECS No.: 201-083-8
Molecular Weight: 208.33 g/mol
Synonyms:
Ethyl silicate; Tetraethoxysilicate; TEOSSilane USi-6042 is a premium-grade tetraethyl orthosilicate (TEOS)—a non-organoreactive alkoxysilane that serves as a versatile inorganic precursor and binder. Upon hydrolysis, it forms a dense silica (SiO₂) network, making it indispensable in coatings, silicone rubber crosslinking, precision casting, and ceramic applications where thermal stability and chemical inertness are critical.
🧪 Product Description
Chemical Formula: Si(OC₂H₅)₄
Chemical Structure:
![Structure: Si(OCH₂CH₃)₄]USi-6042 contains no organic functional group bonded to silicon, distinguishing it from coupling agents like amino or mercapto silanes. Instead, all four ethoxy groups are hydrolyzable, enabling:
- Controlled formation of colloidal silica or silica gel upon exposure to moisture
- Creation of a pure inorganic SiO₂ matrix after curing or calcination
- Excellent adhesion to glass, metal, and mineral surfaces without carbon residue
Compared to TMOS (USi-6041), TEOS hydrolyzes more slowly, offering better process control in casting and coating 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) 0.929 – 0.936 g/cm³ Refractive Index (nD25) 1.3820 – 1.3840 Purity (GC, %) ≥ 98% SiO₂ Content ≥ 28% Alcohol Content ≤ 2%
🏭 Key Applications
🔹 Binders for Coatings & Paints
- Used in inorganic zinc-rich primers and high-temperature resistant coatings
- Forms a durable, chemically inert silicate film upon curing
- Provides long-term corrosion protection in marine and industrial environments
🔹 Crosslinking Agent for Silicone Rubber
- Serves as the crosslinker in alkoxy-cure RTV-1 silicone systems
- Reacts with atmospheric moisture to generate ethanol and build the Si–O–Si network
- Enables non-corrosive, low-odor cure profiles suitable for electronics and construction
🔹 Precision Casting & Ceramic Binders
- Key component in investment casting shell systems for aerospace turbine blades
- Offers high green strength, good flowability, and clean burnout (<500°C)
- Also used in technical ceramics, refractories, and abrasive wheels
🔹 Inorganic Matrix Precursor
- Ideal for applications requiring high-purity silica without organic contamination
- Used in catalyst supports, filtration media, and composite reinforcement
📦 Packaging
Available in industrial-grade containers:
- 20 kg pail
- 180 kg drum
- 950 kg IBC tote
All packaging is moisture-sealed to prevent premature hydrolysis during storage and transport.
⚠️ 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
- Hydrolysis releases ethanol—ensure adequate ventilation during handling
- Use appropriate PPE (gloves, goggles) and avoid contact with water during storage
- 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-Purity Alkoxysilanes & Inorganic Binders- 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: service@usichemical.com
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