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Silane USi-6043 – Tetrapropoxysilane (TPOS)
Non-Organoreactive Alkoxysilane for Controlled Hydrolysis & Specialty Crosslinking
CAS No.: 682-01-9
EINECS No.: 211-659-0
Molecular Weight: 264.44 g/mol
Synonyms:
Tetrapropyl silicate; Tetrapropoxy silaneSilane USi-6043 is a high-purity tetrapropoxysilane (TPOS)—a non-organoreactive alkoxysilane featuring four hydrolyzable propoxy groups. Its bulkier alkoxy chains deliver slower hydrolysis kinetics and enhanced compatibility with organic systems, making it ideal for specialty coatings, controlled sol-gel processes, and as a crosslinker where extended pot life is required.
🧪 Product Description
Chemical Formula: Si(OC₃H₇)₄
Chemical Structure:
![Structure: Si(OCH₂CH₂CH₃)₄]Unlike amino, epoxy, or mercapto silanes, USi-6043 contains no organofunctional group directly bonded to silicon. Instead, it serves as a pure inorganic silica precursor that hydrolyzes to form silanols, which then condense into a SiO₂ network.
The propoxy groups are larger and less polar than methoxy or ethoxy groups, resulting in:
- Slower hydrolysis rate → better process control and longer working time
- Lower volatility and reduced odor vs. TMOS/TEOS
- Improved solubility in less polar solvents and resin systems
This makes USi-6043 particularly valuable in formulations requiring delayed reactivity or enhanced formulation stability.
📊 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 (25°C) 0.910 – 0.920 g/cm³ Refractive Index (nD25) 1.3995 – 1.4015 Purity (GC, %) ≥ 98% SiO₂ Content (by weight) ~22.7%
🏭 Key Applications
🔹 Crosslinking Agent in Silicone, Coatings & Paints
- Used in alkoxy-cure silicone systems requiring extended pot life
- Provides non-corrosive cure with low VOC emissions
- Enhances film integrity and adhesion in specialty industrial coatings
🔹 Controlled Sol-Gel Processes
- Preferred over TEOS/TMOS when slower gelation is needed
- Enables homogeneous hybrid material formation without premature precipitation
- Useful in synthesizing porous silica, thin films, and nanocomposites
🔹 Specialty Chemical Synthesis
- Serves as a reagent in ketal synthesis (protection of carbonyl groups)
- Used in glass frosting/deposition processes via controlled hydrolysis
- Acts as a co-catalyst with CsF in Michael addition reactions
🔹 Formulation Compatibility Enhancer
- Improves miscibility between inorganic precursors and organic resins
- Reduces phase separation in hybrid coating systems
📦 Packaging
Available in industrial-grade containers:
- 20 kg pail
- 180 kg drum
- 900 kg IBC tote
All packaging is sealed to prevent moisture ingress and ensure product stability 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
- Use in well-ventilated areas; avoid contact with water during handling
- Consult the latest Safety Data Sheet (SDS) at www.usi-chemical.com or upon request
📞 Contact Us
Nanjing Union Silicon Chemical Co., Ltd.
Innovator in Specialty Alkoxysilanes for Advanced Industrial Applications- 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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