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Silane USi-6041 – Tetramethoxysilane (TMOS)
Non-Organoreactive Alkoxysilane for Sol-Gel Processes & High-Temperature Coatings
CAS No.: 681-84-5
EINECS No.: 211-656-4
Molecular Weight: 152.22 g/mol
Synonyms:
Methyl silicate; Tetramethyl orthosilicateSilane USi-6041 is a high-purity, non-organoreactive alkoxysilane—chemically known as tetramethoxysilane (TMOS). It rapidly hydrolyzes in the presence of moisture to form reactive silanols that condense into a dense, inorganic silica (SiO₂) network. This makes it a cornerstone precursor in sol-gel chemistry, heat-resistant coatings, and RTV silicone crosslinking.
🧪 Product Description
Chemical Formula: Si(OCH₃)₄
Chemical Structure:
![Structure: Si(OCH₃)₄]Unlike organofunctional silanes (e.g., amino, epoxy, or mercapto types), USi-6041 contains no carbon chain attached to silicon—only four hydrolyzable methoxy groups. Upon exposure to water, it undergoes:
- Hydrolysis: Si(OCH₃)₄ + 4H₂O → Si(OH)₄ + 4CH₃OH
- Condensation: Si(OH)₄ → SiO₂ (silica network) + 2H₂O
This reactivity enables its use as a pure inorganic binder, crosslinker, or nanoscale silica source—ideal where organic residues must be minimized.
Compared to TEOS (USi-6040), TMOS hydrolyzes faster due to the smaller methoxy group, offering quicker gelation in sol-gel processes.
📊 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) 1.030 – 1.035 g/cm³ Refractive Index (nD25) 1.3670 – 1.3690 Purity (GC, %) ≥ 98.0%
🏭 Key Applications
🔹 Sol-Gel Synthesis
- Primary silica precursor for producing:
- Nanoparticles
- Thin films (anti-reflective, protective)
- Aerogels & xerogels
- Hybrid organic-inorganic materials
- Fast hydrolysis enables rapid network formation at mild conditions
🔹 Heat-Resistant & Inorganic Coatings
- Used in high-temperature paints and ceramic coatings
- Forms a thermally stable SiO₂ matrix that withstands >600°C
- Common in exhaust systems, engine parts, and industrial furnaces
🔹 Room Temperature Vulcanizing (RTV) Silicones
- Acts as a crosslinking agent in alkoxy-cure RTV-1 silicone sealants
- Generates methanol during cure (vs. ethanol from TEOS)
- Enables non-corrosive, low-VOC formulations
🔹 Drying Agent in Sealing Compositions
- Accelerates moisture scavenging in moisture-sensitive systems
- Helps control cure profile and shelf life
🔹 Metal Synthesis & Catalysis
- Serves as a reagent or support matrix in metal-organic frameworks (MOFs) and catalyst preparation
📦 Packaging
Available in industrial-grade containers:
- 25 L pail
- 200 L drum
- 1,000 L IBC tote
All packaging is sealed to prevent moisture ingress and premature reaction.
⚠️ 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 methanol—ensure ventilation and avoid water contact during handling
- Use appropriate PPE (gloves, goggles, respirator if needed)
- Consult the latest Safety Data Sheet (SDS) at www.usi-chemical.com or upon request
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Your Trusted Partner for High-Purity Alkoxysilanes & Sol-Gel Precursors- 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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