Tetrabutyl orthosilicate
Tetrabutyl orthosilicate (CAS: 4766-57-8) is an organosilicon compound with the linear formula (CH3CH2CH2CH2O)4Si and a molecular weight of 320.54 g/mol. This clear liquid serves as a versatile precursor in materials science and chemical synthesis. Its properties make it suitable for applications in micro/nanoelectronics and as a component in solution deposition processes, contributing to the development of advanced materials and coatings.
- IUPAC
- Tetrabutoxysilane
- Synonyms
- Tetrabutoxysilane

Precursor for Materials Science
Tetrabutyl orthosilicate is employed as a precursor in the synthesis of various silicon-based materials, including silica nanoparticles and thin films. It is valuable in sol-gel processes for creating specialized coatings and ceramics.
Microelectronics Applications
In the microelectronics industry, this compound can be used in deposition processes to create dielectric layers and other essential components. Its controlled decomposition allows for the formation of high-purity silicon dioxide films.
Chemical Synthesis Intermediate
As an organosilicon reagent, tetrabutyl orthosilicate participates in various organic transformations. It can be used to introduce silicon-containing functionalities into organic molecules.
Solution Deposition
This chemical is utilized in solution deposition techniques for applying thin layers of silicon-containing materials onto substrates. This is important for producing advanced optical and electronic devices.
| Molecular weight | 320.54 |
|---|---|
| Linear formula | (CH3CH2CH2CH2O)4Si |
| Assay | 97% |
| Boiling point | 275 °C(lit.) |
| Density | 0.899 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.413(lit.) |
| Vapour density | >1 (vs air) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | Eyeshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 79 °C / 174.2 °F |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36/37/39 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Tetrabutyl orthosilicate used for?
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Tetrabutyl orthosilicate is used as a precursor in materials science, micro/nanoelectronics, and general chemical synthesis. It is particularly valuable in sol-gel processes and solution deposition for creating silicon-based materials and coatings.
What are the CAS number and formula for Tetrabutyl orthosilicate?
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The CAS number for Tetrabutyl orthosilicate is 4766-57-8, and its linear formula is (CH3CH2CH2CH2O)4Si.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Tetrabutyl orthosilicate with an assay of 97%. We do not represent this product as USP, BP, or EP grade.
What are the safety considerations when handling Tetrabutyl orthosilicate?
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Tetrabutyl orthosilicate is classified as a warning substance, causing skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). Appropriate personal protective equipment, including eyeshields and gloves, should be worn. Handling should occur in a well-ventilated area, and respiratory protection such as an ABEK respirator filter is recommended.
How are Tetrabutyl orthosilicate products packed, shipped, and exported?
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TSS carefully packs all chemicals to meet international shipping standards. We are experienced global exporters of laboratory reagents and fine chemicals.
How can I request a quote or sample of Tetrabutyl orthosilicate?
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To request a quote or sample, please contact our sales department via the website or provide your details through the product enquiry form.
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